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Retire Plan

Retire Plan Report

Mid forties, one income, catching up September 25, 2026

Working until 65, in 2045, with a plan that runs to age 95.

Sample plan. These are the numbers of one of our sample households, not yours.

Prepared
September 25, 2026
Dollars
Summary numbers and charts are in 2026 dollars: what the money would buy in 2026. The year-by-year tables are in future dollars: the amounts you would see on a statement in that year, if prices rise 2.5% a year.
Made with
Retire Plan, from market history since 1871. Every number is worked out from your inputs.

This report is not financial, tax or legal advice. It shows what your inputs lead to under the rules described inside.

Section 1

Your plan on one page

Retire at 65 with $985K, spend $74K a year, and history gives a 90% success rate.

Historical testing
90%

success rate: the share of cases since 1871 that never ran out of money.

A case is your plan started in one year of real history: once as if you began in 1871, once in 1872, and so on to 1977. Each case lives through the booms, crashes and inflation that really came next.

Future simulation
87%

success rate across 1,000 random futures: the share that never ran out.

A random future strings together years drawn at random from history, a few years at a time, so it can put good and bad years in orders that never happened. It is a second opinion on the first number.

Your savings when you retire at 65
$985K

In 2026 dollars, if markets return what you assumed. That is about $1.57M in 2045 dollars. In history the median case had $1.13M.

What you can spend
$74K a year

After tax, in 2026 dollars, about $6K a month. It rises with prices every year.

Balance at the end of the plan
$1.23M

The median case's savings at the end of the plan, age 95, in 2026 dollars. Half the cases ended with more.

The hardest case
Ran out at 83

The plan started in 1956 ran out of money at age 83.

What the report explored

  • Spending $73K a year would bring the success rate to 95%.
  • Retiring at 66 would bring the success rate to 95%.
  • Barista FIRE and Coast FIRE: your plan is below a 95% success rate as it is, so start with the spending and the retirement age.

Each is worked out in section 6, "What if things change".

Section 2

Your plan and your assumptions

19 more years of work, then 30 years in retirement, to age 95.

What to look at

Everything the report was built from. If any of it is wrong, change it in the planner and build the report again.

One word about returns. A return after inflation is what your money grows by once rising prices are taken out. A 5.0% return after inflation, with 2.5% inflation, is about 7.6% a year on your statement. Only the expected path uses these returns. The historical analysis uses the real market returns of each year since 1871, and the future simulation draws from them.

Figure 1. Your paycheck, in this year's dollars

LineShare of gross payPer paycheck26 a yearPer month12 a yearPer year
Gross pay$3,654$7,917$95,000
Traditional 401K($292)($633)($7,600)
Federal tax($400)($867)($10,398)
Social Security and Medicare($280)($606)($7,268)
State tax($133)($289)($3,464)
Take home$2,549$5,523$66,271
Roth IRA($269)($583)($7,000)
Spending budget$2,280$4,939$59,271
Housing($1,015)($2,200)($26,400)
Everything else$1,264$2,739$32,871
Employer match, on top$146$317$3,800

Savings rate

10%25%50%
19.4% of gross pay 24.9% of pay after taxes
Each bar is a share of your gross pay. The three columns are the same money per paycheck, per month and per year, in 2026 dollars.
You
Your age at the end of 202646
Tax returnSingle
StateMichigan
Timeline
Stop full-time work at65, in 2045
Plan runs to age95
Years in retirement30
Pay and saving
Salary$95,000 a year
Yearly raise2.5%, including inflation
Into your 401K, pre-tax8.0% of pay, $7,600 a year
Into your Roth 401K0.0% of pay, $0 a year
Employer match4.0% of pay, $3,800 a year
Into your IRA each year$0 pre-tax, $7,000 Roth, in 2026 dollars
Into your taxable account each year$0 in 2026 dollars
Savings today, 2026
401K, pre-tax$120,000
Roth 401K$0
IRA, pre-tax$0
Roth IRA$35,000
Taxable account$10,000
Spending in retirement
Spending, after tax$74,000 a year in 2026 dollars
Social Security and pension lower what you drawYes
Taxable accountSpent first
Share drawn from the IRA, the rest from the 401K30%
Social Security and pension
Social Security$3,250 a month in 2026 dollars, from age 67, our estimate from your pay
PensionNone
Markets and prices
Inflation2.5% a year, for the expected path and the future-dollar tables
Return while working5.0% a year after inflation
Return in retirement5.0% a year after inflation
Stocks while working75%, the rest in bonds
Stocks in retirement50%, the rest in bonds
Dividend and bond yields1.3% and 4.6% a year before inflation, for the expected path; history uses each year's own
HistoryEvery case since 1871, with each year's real inflation
Random futures1,000 runs, years drawn from history 5 at a time
Taxes
Federal income tax2026 federal brackets and standard deduction, carried forward with inflation
State income taxMichigan's 2026 state tax rules, with its own rules for pensions, withdrawals, Social Security and gains by age and income
IRS rules appliedIRS contribution limits, the 10% penalty on early withdrawals, the Rule of 55, required minimum distributions, Social Security and Medicare tax on pay, the yearly tax on dividends and interest in the taxable account

Section 3

Your plan in pictures

Even the 10th percentile case retires with $557K, in 2026 dollars.

What to look at

Every chart is in 2026 dollars. The first three use a log scale: each step up the side multiplies the money, so a fall from $1M to $500K looks as tall as one from $200K to $100K. Their side starts near the lowest balance drawn, not at $0.

Figure 2. Every case since 1871, one line each

Expected pathMedian caseA case that survivedA case that ran out
retireSocial SecurityRMDs begin5055606570758085901K3K10K30K100K300K1M3M
A 90% success rate: the red lines ran out of money. Each grey line is your plan started in one year of history. The red ones ran out. The green line is the expected path and the dashed line is the median case.

Figure 3. Your savings in the historical market analysis ("back testing")

Expected pathMedian of the casesMiddle half of the cases10th to 90th percentile
retireSocial SecurityRMDs begin50556065707580859030K100K300K1M3M
The median case retires with $1.13M. The dark band holds the middle half of the 107 cases and the light band the 10th to 90th percentile. Where the light band nears the bottom, the worst tenth of cases were running low.

Figure 4. Your savings in 1,000 random futures

Expected pathMedian of the random futuresMiddle half of the random futures5th to 95th percentile
retireSocial SecurityRMDs begin5055606570758085901K3K10K30K100K300K1M3M10M
A 87% success rate across 1,000 random futures. Random futures mix good and bad years in new orders, so the bands spread wider than history did.

Figure 5. Where the money sits

401KRoth IRATaxable
retireSocial SecurityRMDs begin5055606570758085900200K400K600K800K1M1.2M1.4M
At 65, 67% of your savings is pre-tax. Pre-tax money is taxed as it comes out; Roth money is not. Each layer is one account on the expected path.

Figure 6. Where your spending money comes from

You can spendSocial SecuritySalary401KRoth IRATaxableRMD reinvested
retireSocial SecurityRMDs begin505560657075808590020K40K60K80K100K120K
From 67, Social Security pays 50% of the money coming in. The line on top is what you can spend after tax and after saving. The layers under it are where the money came from each year on the expected path.

Section 4

Year by year, in future dollars

You put away $441K over 19 years of work, then take out $3.02M in retirement, in future dollars.

What to look at

These tables are in future dollars: the amounts you would actually see in each year, if prices rise 2.5% a year. They follow the expected path, the one where markets return what you assumed.

What this means for you

Use them as targets. Each year, compare what you saved, took out and hold with the row for that year.

How much to save each year

What goes into each account while you work. The pre-tax 401K column includes your employer's match. IRS limits are already applied.

Total saved, each yearPeak $29K at 64
4664
AgeYearSalary401K, pre-taxRoth IRATotal saved
462026$95,000$11,400$7,000$18,400
472027$97,375$11,685$7,175$18,860
482028$99,809$11,977$7,354$19,331
492029$102,305$12,277$7,538$19,815
502030$104,862$12,583$7,727$20,310
512031$107,484$12,898$7,920$20,818
522032$110,171$13,221$8,118$21,338
532033$112,925$13,551$8,321$21,872
542034$115,748$13,890$8,529$22,419
552035$118,642$14,237$8,742$22,979
562036$121,608$14,593$8,961$23,554
572037$124,648$14,958$9,185$24,142
582038$127,764$15,332$9,414$24,746
592039$130,959$15,715$9,650$25,365
602040$134,233$16,108$9,891$25,999
612041$137,588$16,511$10,138$26,649
622042$141,028$16,923$10,392$27,315
632043$144,554$17,346$10,651$27,998
642044$148,168$17,780$10,918$28,698
All years$272,984$167,622$440,607

How much to take out of each account

What to withdraw from each account in retirement, before tax. Taxes come out of these amounts. From age 75 the IRS makes you take a minimum from pre-tax accounts each year. That column shows how much of the withdrawal was the required minimum (and any 72(t) payment).

Total withdrawn, each yearPeak $142K at 94
6594
AgeYear401K, pre-taxRoth IRATaxableTotal withdrawnRequired by the IRS
652045$60,784$24,542$37,071$122,397$0
662046$90,847$35,964$1,376$128,188$0
672047$48,141$17,620$51$65,812$0
682048$49,482$18,076$2$67,560$0
692049$50,815$18,528$0$69,343$0
702050$52,179$18,992$0$71,171$0
712051$53,578$19,466$0$73,044$0
722052$55,011$19,953$0$74,964$0
732053$56,481$20,452$0$76,933$0
742054$57,987$20,963$0$78,950$0
752055$76,630$7,785$0$84,415$53,795
762056$78,995$7,629$0$86,624$56,736
772057$81,377$7,502$0$88,879$59,611
782058$83,933$7,283$0$91,216$62,937
792059$86,596$7,024$0$93,620$66,492
802060$89,374$6,722$0$96,096$70,296
812061$92,159$6,460$0$98,619$73,988
822062$95,265$5,996$0$101,261$78,327
832063$98,402$5,557$0$103,959$82,517
842064$101,844$4,930$0$106,774$87,480
852065$105,262$4,373$0$109,635$92,244
862066$108,740$3,822$0$112,562$97,306
872067$112,346$3,225$0$115,571$102,697
882068$115,871$2,747$0$118,618$107,654
892069$119,779$2,027$0$121,806$113,714
902070$123,568$1,458$0$125,026$119,205
912071$127,483$851$0$128,334$124,938
922072$131,526$204$0$131,730$130,914
932073$137,130$0$0$137,130$137,130
942074$141,908$0$0$141,908$141,908
All years$2,683,492$300,151$38,500$3,022,144

What you pay in taxes, estimated

Federal income tax (including tax on investment gains), state income tax, any early-withdrawal penalty, and the Social Security and Medicare tax taken from pay. The tax on the brokerage account's dividends and interest is paid out of that account each year, not out of your spending, so it is not in the total. These are estimates from the federal brackets and the state table, not a tax return.

Total tax, each yearPeak $33K at 64
4694
AgeYearFederalStatePayrollTax inside the brokerage accountTotal
462026$10,398$3,464$7,268$49$21,129
472027$10,658$3,550$7,449$52$21,657
482028$10,924$3,639$7,635$56$22,199
492029$11,198$3,730$7,826$60$22,754
502030$11,477$3,823$8,022$64$23,323
512031$11,764$3,919$8,223$69$23,906
522032$12,058$4,017$8,428$73$24,503
532033$12,360$4,117$8,639$79$25,116
542034$12,669$4,220$8,855$84$25,744
552035$12,986$4,326$9,076$90$26,388
562036$13,310$4,434$9,303$97$27,047
572037$13,643$4,545$9,536$104$27,723
582038$13,984$4,658$9,774$111$28,416
592039$14,334$4,775$10,018$119$29,127
602040$14,692$4,894$10,269$128$29,855
612041$15,059$5,017$10,526$137$30,601
622042$15,436$5,142$10,789$146$31,366
632043$15,822$5,271$11,058$157$32,151
642044$16,217$5,402$11,335$168$32,954
652045$3,519$578$0$0$4,097
662046$6,930$0$0$0$6,930
672047$7,027$0$0$0$7,027
682048$7,305$0$0$0$7,305
692049$7,582$0$0$0$7,582
702050$7,865$0$0$0$7,865
712051$8,156$0$0$0$8,156
722052$8,454$0$0$0$8,454
732053$8,760$0$0$0$8,760
742054$9,073$0$0$0$9,073
752055$12,790$0$0$0$12,790
762056$13,209$0$0$0$13,209
772057$13,629$0$0$0$13,629
782058$14,084$0$0$0$14,084
792059$14,561$0$0$0$14,561
802060$15,059$0$0$0$15,059
812061$15,557$0$0$0$15,557
822062$16,123$0$0$0$16,123
832063$16,692$0$0$0$16,692
842064$17,325$0$0$0$17,325
852065$17,950$0$0$0$17,950
862066$18,585$0$0$0$18,585
872067$19,245$0$0$0$19,245
882068$19,884$0$0$0$19,884
892069$20,603$0$0$0$20,603
902070$21,293$0$0$0$21,293
912071$22,007$0$0$0$22,007
922072$22,745$0$0$0$22,745
932073$23,823$0$0$0$23,823
942074$24,728$0$0$0$24,728
All years$683,551$83,521$174,028$1,841$941,100

What you can spend

Everything that comes in, less taxes, less what you save. The last column is the same spending in 2026 dollars, so you can see it holds its buying power.

You can spend, each yearPeak $242K at 94
4694
AgeYearMoney inTaxesSavedYou can spendIn 2026 dollars
462026$95,000$21,129$14,600$59,271$59,271
472027$97,375$21,657$14,965$60,753$59,271
482028$99,809$22,199$15,339$62,271$59,271
492029$102,305$22,754$15,723$63,828$59,271
502030$104,862$23,323$16,116$65,424$59,271
512031$107,484$23,906$16,519$67,059$59,271
522032$110,171$24,503$16,932$68,736$59,271
532033$112,925$25,116$17,355$70,454$59,271
542034$115,748$25,744$17,789$72,216$59,271
552035$118,642$26,388$18,233$74,021$59,271
562036$121,608$27,047$18,689$75,872$59,271
572037$124,648$27,723$19,156$77,768$59,271
582038$127,764$28,416$19,635$79,713$59,271
592039$130,959$29,127$20,126$81,705$59,271
602040$134,233$29,855$20,629$83,748$59,271
612041$137,588$30,601$21,145$85,842$59,271
622042$141,028$31,366$21,674$87,988$59,271
632043$144,554$32,151$22,216$90,187$59,271
642044$148,168$32,954$22,771$92,442$59,271
652045$122,397$4,097$0$118,300$74,000
662046$128,188$6,930$0$121,258$74,000
672047$131,316$7,027$0$124,289$74,000
682048$134,701$7,305$0$127,396$74,000
692049$138,163$7,582$0$130,581$74,000
702050$141,711$7,865$0$133,846$74,000
712051$145,348$8,156$0$137,192$74,000
722052$149,076$8,454$0$140,622$74,000
732053$152,897$8,760$0$144,137$74,000
742054$156,813$9,073$0$147,741$74,000
752055$164,224$12,790$0$151,434$74,000
762056$168,429$13,209$0$155,220$74,000
772057$172,729$13,629$0$159,101$74,000
782058$177,162$14,084$0$163,078$74,000
792059$181,716$14,561$0$167,155$74,000
802060$186,393$15,059$0$171,334$74,000
812061$191,174$15,557$0$175,617$74,000
822062$196,130$16,123$0$180,008$74,000
832063$201,200$16,692$0$184,508$74,000
842064$206,446$17,325$0$189,120$74,000
852065$211,798$17,950$0$193,849$74,000
862066$217,280$18,585$0$198,695$74,000
872067$222,907$19,245$0$203,662$74,000
882068$228,637$19,884$0$208,754$74,000
892069$234,576$20,603$0$213,972$74,000
902070$240,615$21,293$0$219,322$74,000
912071$246,812$22,007$0$224,805$74,000
922072$253,170$22,745$0$230,425$74,000
932073$261,606$23,823$1,597$236,186$74,000
942074$269,496$24,728$2,678$242,090$74,000

What each account holds

Balances on 1 January of each year. The last column is the total in 2026 dollars.

Total held, each yearPeak $3.92M at 94
4694
AgeYear401K, pre-taxRoth IRATaxableTotalIn 2026 dollars
462026$120,000$35,000$10,000$165,000$165,000
472027$140,996$44,943$10,714$196,653$191,856
482028$163,889$55,825$11,479$231,193$220,053
492029$188,831$67,724$12,298$268,854$249,658
502030$215,987$80,721$13,176$309,884$280,740
512031$245,531$94,905$14,117$354,554$313,374
522032$277,656$110,371$15,125$403,152$347,637
532033$312,565$127,223$16,205$455,992$383,611
542034$350,479$145,570$17,362$513,411$421,380
552035$391,637$165,532$18,601$575,770$461,035
562036$436,293$187,238$19,929$643,460$502,670
572037$484,724$210,826$21,352$716,902$546,383
582038$537,227$236,445$22,877$796,549$592,279
592039$594,123$264,257$24,510$882,889$640,466
602040$655,754$294,434$26,260$976,447$691,058
612041$722,494$327,162$28,134$1,077,790$744,177
622042$794,740$362,643$30,143$1,187,526$799,947
632043$872,925$401,092$32,295$1,306,312$858,502
642044$957,510$442,744$34,601$1,434,855$919,980
652045$1,048,996$487,848$37,071$1,573,915$984,528
662046$1,065,821$499,544$1,376$1,566,740$956,136
672047$1,052,688$500,262$51$1,553,001$924,636
682048$1,082,931$520,098$2$1,603,031$931,144
692049$1,114,087$540,972$0$1,655,059$937,917
702050$1,146,233$562,968$0$1,709,201$944,975
712051$1,179,413$586,159$0$1,765,572$952,333
722052$1,213,669$610,626$0$1,824,295$960,007
732053$1,249,048$636,453$0$1,885,500$968,015
742054$1,285,597$663,730$0$1,949,327$976,375
752055$1,323,369$692,556$0$2,015,925$985,104
762056$1,344,647$737,274$0$2,081,921$992,541
772057$1,365,091$785,564$0$2,150,655$1,000,302
782058$1,384,618$837,668$0$2,222,286$1,008,408
792059$1,402,978$893,973$0$2,296,951$1,016,867
802060$1,419,971$954,839$0$2,374,810$1,025,693
812061$1,435,373$1,020,661$0$2,456,034$1,034,902
822062$1,449,056$1,091,773$0$2,540,829$1,044,519
832063$1,460,554$1,168,790$0$2,629,344$1,054,543
842064$1,469,668$1,252,137$0$2,721,805$1,065,001
852065$1,475,902$1,342,489$0$2,818,391$1,075,897
862066$1,479,059$1,440,310$0$2,919,369$1,087,262
872067$1,478,842$1,546,162$0$3,025,005$1,099,126
882068$1,474,863$1,660,705$0$3,135,568$1,111,511
892069$1,466,916$1,784,480$0$3,251,396$1,124,459
902070$1,454,303$1,918,440$0$3,372,743$1,137,976
912071$1,436,791$2,063,205$0$3,499,997$1,152,109
922072$1,413,876$2,219,641$0$3,633,517$1,166,888
932073$1,385,012$2,388,676$0$3,773,688$1,182,345
942074$1,348,124$2,570,813$1,660$3,920,596$1,198,413

Section 5

What this report leaves out

12 things this plan does not count. Read them before you rely on the numbers.

What this means for you

Budget for health care, housing and big one-off costs inside your spending. If you pay fund or advice fees, lower the returns you assume by the same amount.

Health care
No health insurance, doctor bills or drug costs, and no cover before Medicare at 65. No health savings account (HSA). Budget for these inside your spending.
Medicare premiums
Medicare Part B and D premiums, and the higher premiums (IRMAA) charged on higher incomes, are not taken out.
Long-term care
No nursing home, assisted living or care at home.
Your home
Housing is part of your spending. A mortgage that ends is not modeled, so spending stays the same after it is paid off. No home equity or downsizing.
Some taxes
No alternative minimum tax (AMT), no city or county income tax, standard deduction only (no itemizing), and some state rules are simplified. Every dividend in the taxable account is taxed as a qualified dividend, and its bond interest is taxed by your state too.
Moves you can make
No Roth conversions, no annuities, and no 457(b), 403(b) catch-up, 529 or inherited-account rules. An inherited IRA is treated as your own. 72(t) equal payments are counted only if you turned them on, and never stopped early.
One household, the whole way
A couple is modeled as both living to the end of the plan, filing jointly. No survivor years, no widow’s tax brackets, and each account is one household account.
Whole-year steps
Ages, raises, retirement and claiming Social Security happen a whole year at a time. Money moves in and out at least monthly within each year.
Social Security as given
The benefit is paid in full as shown. No cut to the program is assumed, and a gap in pay does not lower it.
Flat spending
Spending holds steady after inflation. No big one-off costs such as a car, a wedding or help for family, and no change in spending with age.
Fees
Fund fees and advice fees are not taken off returns. If you pay 1% a year, your returns are 1% lower than shown.
The past as a guide
History here is United States stocks and Treasury bonds since 1871. The future can be worse than any case in it.

Section 6

What if things change

Spending $73K a year would bring the success rate to 95%.

Your key numbers, explored

Each one moves part of your plan until the success rate sits at 95%. They are ways to see how much room the plan has, not things you must change.

Spending

Today your success rate is 90%. Spending $73K a year after tax would bring the success rate to 95%. That is $1K less than now.

Retirement age

Today your success rate is 90%. Retiring at 66, 1 year later, would bring the success rate to 95%. The plan still ends at 95.

Barista FIRE

Your plan is below a 95% success rate as it is, so there is no room yet to go part-time early. The spending and retirement age above show what would bring it there.

Coast FIRE

Your plan is below a 95% success rate as it is, so there is no room yet to go part-time early. The spending and retirement age above show what would bring it there.

They are searched on history alone, not the random futures. Each one changes only that part of the plan.

What to look at

Of the changes tested, “Retire 5 years earlier” moves your success rate most: from 90% to 26%.

Each what-if changes one thing and runs your plan through the same history again. Each is judged by the one number that matters most for it. Money is in 2026 dollars.

What ifWhat we look atYour planWith the change
Retire 5 years earlierYou stop work at 60 instead of 65. The plan still ends at 95.Success rate90%
Success rate, random futures
87%
Savings at retirement
$985K
Balance at the end of the plan
$1.23M
26% −64 pts
Success rate, random futures
39% −48 pts
Savings at retirement
$691K −$293K
Balance at the end of the plan
$0 −$1.23M
Retire 5 years laterYou stop work at 70 instead of 65. The plan still ends at 95.Success rate90%
Success rate, random futures
87%
Savings at retirement
$985K
Balance at the end of the plan
$1.23M
100% +10 pts
Success rate, random futures
99% +12 pts
Savings at retirement
$1.36M +$374K
Balance at the end of the plan
$2.46M +$1.23M
Spend 10% moreYou spend $81,400 a year after tax instead of $74,000, in 2026 dollars.Success rate90%
Success rate, random futures
87%
Savings at retirement
$985K
Balance at the end of the plan
$1.23M
77% −13 pts
Success rate, random futures
77% −10 pts
Savings at retirement
$985K same
Balance at the end of the plan
$695K −$537K
Spend 10% lessYou spend $66,600 a year after tax instead of $74,000, in 2026 dollars.Success rate90%
Success rate, random futures
87%
Savings at retirement
$985K
Balance at the end of the plan
$1.23M
100% +10 pts
Success rate, random futures
94% +7 pts
Savings at retirement
$985K same
Balance at the end of the plan
$1.75M +$515K
The lost decade at retirementThe markets and prices of 2000–2009 happen again starting the year you retire, at 65, in every case.Balance at the end of the plan, the median case$1.23M
Success rate, history
90%
Savings at retirement
$985K
$562K −$670K
Success rate, history
71% −19 pts
Savings at retirement
$985K same
Stagflation at retirementThe markets and prices of 1973–1982 happen again starting the year you retire, at 65, in every case.Balance at the end of the plan, the median case$1.23M
Success rate, history
90%
Savings at retirement
$985K
$0 −$1.23M
Success rate, history
40% −50 pts
Savings at retirement
$985K same
The 2008 crash at retirementThe markets and prices of 2008–2009 happen again starting the year you retire, at 65, in every case.Balance at the end of the plan, the median case$1.23M
Success rate, history
90%
Savings at retirement
$985K
$821K −$411K
Success rate, history
83% −7 pts
Savings at retirement
$985K same
A year with no payYou earn nothing for a year from age 47, and nothing goes into your accounts that year. Nothing comes out of them either: the plan assumes you get by on other money.Savings at retirement, the median case$1.13M
Success rate, history
90%
Success rate, random futures
87%
Savings at retirement
$985K
Balance at the end of the plan
$1.23M
$1.08M −$47K
Success rate, history
88% −2 pts
Success rate, random futures
85% −2 pts
Savings at retirement
$942K −$43K
Balance at the end of the plan
$1.04M −$193K
Claim Social Security at 62You start Social Security at 62 instead of 67. The benefit is our estimate for that age.Balance at the end of the plan, the median case$1.23M
Success rate, history
90%
Success rate, random futures
87%
Savings at retirement
$985K
$1.07M −$160K
Success rate, history
88% −2 pts
Success rate, random futures
85% −2 pts
Savings at retirement
$985K same
Claim Social Security at 70You start Social Security at 70 instead of 67. The benefit is our estimate for that age.Balance at the end of the plan, the median case$1.23M
Success rate, history
90%
Success rate, random futures
87%
Savings at retirement
$985K
$1.40M +$169K
Success rate, history
89% −1 pt
Success rate, random futures
88% +1 pt
Savings at retirement
$985K same
Plan to 5 years laterThe plan runs to 100 instead of 95, so the money has to last 5 more years.Success rate90%
Success rate, random futures
87%
Savings at retirement
$985K
Balance at the end of the plan
$1.23M
86% −3 pts
Success rate, random futures
83% −4 pts
Savings at retirement
$985K same
Balance at the end of the plan
$1.23M −$957
Plan to 5 years earlierThe plan runs to 90 instead of 95, so the money has to last 5 fewer years.Success rate90%
Success rate, random futures
87%
Savings at retirement
$985K
Balance at the end of the plan
$1.23M
96% +6 pts
Success rate, random futures
91% +4 pts
Savings at retirement
$985K same
Balance at the end of the plan
$1.06M −$173K

Under each number, in small type: the other results of the same runs. Savings at retirement follow the expected path; the balance at the end of the plan is the median case. A replayed market is one stretch of real history, so it runs on history alone. Money is in 2026 dollars.

How each one is judged

Retiring earlier or later, spending more or less, a longer or shorter plan
The share of cases that never ran out. These change how long the money has to last or how fast it goes.
A bad market
The balance at the end of the plan in the median case. Your spending stays the same, so the damage shows in what is left.
A year with no pay
Your savings on the day you retire, in the median case. The gap happens while you work, so that is where it shows first.
When to claim Social Security
The balance at the end of the plan in the median case. Claiming early pays less for longer; claiming late pays more for fewer years. The ending balance shows which comes out ahead for you.
The smaller numbers
Every row also shows the other results of the same runs: the success rate in history and in the random futures, your savings at retirement on the expected path, the balance at the end of the plan in the median case. A plus or minus beside a number is the change from your plan, in green when it is better and in red when it is worse.

Section 7

Your own what-if

What if: The lost decade replayed from 65, your retirement. The success rate goes from 90% to 71%.

You built this what-if in the What-if tab. The report runs it beside your plan through the same 107 cases of history and 1,000 random futures, under the same rules. Each case is paired with itself, the same year of history under both plans, so a difference between them is the change, not the market. Money is in 2026 dollars.

The what-if replays 2000–2009 at ages 65 to 74, with the stock and bond returns and the inflation of those years, in every case and every Monte Carlo run.

What changes

WhatYour planWhat-if
Replay past marketsEach case's own historyThe lost decade replayed from 65, your retirement

Side by side

NumberYour planWhat-ifDifference
Success ratecases since 1871 that never ran out90%71%−19 pts
Years paid in fullshare of retired years, every case98.2%88.7%−9.5 pts
Short years averagedunder the target, per year$32K$34K+$2K
Retire at age2045 vs 20456565same
Plan ends at age9595same
Balance at retirementexpected path$985K$985Ksame
Median ending balancehistory$1.23M$562K−$670K
Spent in retirementexpected path, total$2.22M$2.22Msame
Lifetime income taxexpected path$442K$403K−$39K
Lifetime payroll taxSocial Security and Medicare$138K$138Ksame
Monte Carlo success rate1,000 runs that never ran out87%73%−14 pts
Monte Carlo median ending$2.10M$802K−$1.29M

Green and red mark the direction that is better for the number, not a verdict on the plan. Money is in 2026 dollars.

Figure 7. Same history, both plans

70%
both never ran out
1%
only the what-if never ran out
20%
only your plan never ran out
9%
both ran out
In 1% of cases only the what-if never ran out; in 20% only your plan never ran out. Each case is your plan started in one year of history, run under both plans. The four numbers are shares of those cases.

Figure 8. Balance over time, both plans

Your plan, median (dashed)Your plan, middle halfWhat-if, medianWhat-if, middle half10th to 90th percentile, faint
2000–2009 replayedretire5055606570758085900500K1M1.5M2M2.5M3M
Under the what-if, the median case ends the plan with $562K, against $1.23M on your plan. The solid line and the green bands are the what-if: its median case, the middle half of cases and, faint, the 10th to 90th percentile. The dashed line and the grey bands are your plan. The scale is linear, so the height of the gap is its size in dollars.

Figure 9. Total balance, both plans

Your plan (dashed)What-if
2000–2009 replayedretire5055606570758085900200K400K600K800K1M1.2M1.4M
On the expected path the what-if retires with $985K, against $985K on your plan. The expected path, in 2026 dollars: markets return what you assumed every year, with no market history. The solid line is the what-if, the dashed line your plan.

Figure 10. Where the money sits, both plans

401KRoth IRATaxable
Your plan
retire5055606570758085900200K400K600K800K1M1.2M1.4M
What-if
2000–2009 replayedretire5055606570758085900200K400K600K800K1M1.2M1.4M
On the expected path the what-if ends with $266K, against $1.22M on your plan. One scale for both, in 2026 dollars. Each layer is one account on the expected path, where markets return what you assumed every year.

Figure 11. What pays for each year, both plans

You can spendSocial SecuritySalary401KRoth IRATaxableRMD reinvested
Your plan
retire505560657075808590020K40K60K80K100K120K
What-if
2000–2009 replayedretire505560657075808590020K40K60K80K100K120K
Income tax over the whole plan: $403K under the what-if, against $442K on your plan. One scale for both, in 2026 dollars, on the expected path. The solid line is what you can spend after tax and after saving. Both plans spend the same each year.

Figure 12. The difference, year by year

Median differenceMiddle half of cases10th to 90th percentileBehind the baseline
median -$555K2000–2009 replayedretire505560657075808590-2M-1.5M-1M-500K0+500K+1M+1.5M
At 94, the what-if is ahead in 22% of cases. The median difference is −$555K. The what-if minus your plan in each case, then the spread across all of them. Above the line the what-if is ahead; below it, behind.

Figure 13. How each case ends

The what-if ends with moreThe what-if ends with less
18801900192019401960-3M-2M-1M0+1M+2M+3M
The what-if ends the plan with more in 22% of cases and with less in 71%. The median difference is −$565K. One bar per case, placed by the year the case started: the balance at the end of the plan under the what-if, minus the balance under your plan.

Figure 14. Monte Carlo, both plans

Your plan, median (dashed)Your plan, middle halfWhat-if, medianWhat-if, middle half10th to 90th percentile, faint
2000–2009 replayed5055606570758085901K3K10K30K100K300K1M3M10M
Across 1,000 random futures the success rate goes from 87% to 73%. Random futures are drawn for each plan on its own, so they do not pair the way the cases of history do. The median and the middle half of runs for each plan, on a log scale that starts near the lowest balance drawn.

What this means for you

This what-if puts events on your plan; it does not change your inputs, so there is nothing to make your plan. The rest of this report is about your plan as saved.

Section 8

Words used in this report

Every term the report uses, 25 in all, each one explained.

Case
Your plan started in one year of real market history. The case that started in 1966 lives through the markets and prices of 1966 onward.
Never ran out
A case where the money lasted to the end of the plan, paying your full spending every year.
Years paid in full
For a plan that draws a percentage: the share of retired years, across every case, that paid at least your target.
Random futures (Monte Carlo)
Made-up futures built by drawing years at random from history. A way to test orders of good and bad years that never happened.
Median
Half the cases did better than the median case and half did worse. The median is not an average of them.
Percentile
The 10th percentile is the case that did better than one in ten; the 90th did better than nine in ten.
Expected path
One smooth future where markets return exactly what you assumed every year. Useful for tables, but real markets are never this smooth.
Today’s dollars
Money measured by what it buys in the report’s dollar year. Also called real dollars.
Future dollars
The number you will actually see on a statement in that year. Also called nominal dollars. Higher than today’s dollars because prices rise.
Inflation
The yearly rise in prices. At 2.5% a year, prices roughly double in 28 years.
Return after inflation
How much your money grows once rising prices are taken out. Also called a real return.
401K
A retirement account through your job. Money goes in from your pay, often with a match from your employer.
IRA
An individual retirement account you open yourself.
Pre-tax (traditional)
Money that went in before income tax. You pay the tax when you take it out.
Roth
Money that went in after tax. It comes out tax-free once the rules are met.
Taxable account
An ordinary investment account. You pay tax on the gains when you sell.
Employer match
What your employer adds to your 401K when you put money in.
Required minimum distribution (RMD)
The least the IRS makes you take out of pre-tax accounts each year from age 73 or 75. Money you do not spend goes back into the taxable account.
Early withdrawal penalty
An extra 10% tax on money taken from a 401K or IRA before age 59 and a half.
Rule of 55
Leave your job in or after the year you turn 55 and you can take money from that job’s 401K without the 10% penalty.
Social Security
The federal retirement benefit. Claiming at 62 pays less each month; waiting to 70 pays more.
Payroll tax
Social Security and Medicare tax taken from pay while you work.
Capital gains
The growth on an investment you sell for more than you paid. Taxed at 0%, 15% or 20% depending on your income.
Withdrawal rate
The share of your savings you take out in a year.
Stocks and bonds
Stocks grow more over time and fall harder in bad years. Bonds grow less and fall less. The split is how much of your savings sits in each.

Section 9

How the numbers are checked

Nothing on these pages is typed in by hand.

Retire Plan works out every number from your inputs and from published data.

  • Market history is Robert Shiller's monthly series, 1871 to 2025: United States stocks with dividends, 10-year Treasury bonds and inflation. Each year's dividend yield and 10-year Treasury yield also set that year's tax on the taxable account's dividends and interest. The script that builds it is published with the planner.
  • Tax brackets, contribution limits and required minimum distributions follow the 2026 IRS figures, carried forward with inflation.
  • The engine is tested against the planner it replaced, line by line, and against the well-known studies of the 4% rule: at 4%, 30 years and 75% stocks since 1926, about 98.6% of cases last.
  • Sample households are worked out by hand and checked against it.

Every check and the sums done by hand are at retire-plan.app/accuracy/.