Translating a retirement balance into monthly purchasing power makes the savings figure easier to use. Retirement income depends not only on how much you have saved, but also on how long the money needs to last, how investments perform relative to inflation, and how much income comes from sources such as Social Security or pensions.
Retirement Income Calculator
Return & inflation assumptions
Calculation details
| Years of income | - |
|---|---|
| Net real annual return | - |
| Implied first-year withdrawal rate | - |
| Monthly income needed from savings | - |
| Starting savings | - |
The projection converts a starting savings balance into level monthly income in today's dollars over the selected period. It assumes a constant investment return and inflation rate, does not model market volatility, taxes, account-specific withdrawal rules, required minimum distributions, or lifetime guarantees, and is not an annuity quote.
How to Use the Retirement Income Calculator
Enter the savings available when retirement income begins, other monthly retirement income and the number of years the savings should support withdrawals. An optional monthly target lets you compare the modeled income with the spending level you want to fund.
Other monthly retirement income can include Social Security, pensions or annuity payments. Personalized Social Security estimates are available through a my Social Security account, including estimates for different claiming ages based on the worker’s earnings record.
Advanced assumptions contain expected investment return and inflation. Monthly results are expressed in today’s dollars so the amount represents approximately the same purchasing power throughout the selected period rather than a fixed nominal dollar amount that loses purchasing power over time.
How Monthly Income Is Calculated
Retirement savings are modeled as a pool that is gradually spent down over the selected number of years. Investment return and inflation are first converted into a real annual return:
Real annual return is then converted to an equivalent monthly rate. Present-value annuity math determines the level monthly withdrawal that would reduce the starting savings balance to approximately zero by the end of the selected period if the assumptions occurred exactly as entered.
Monthly timing matters. Applying a monthly rate and monthly withdrawals is more precise for a monthly-income calculator than computing one annual payment and simply dividing it by 12.
Negative real returns are also preserved. When inflation exceeds the investment return, purchasing power declines and the amount that can be withdrawn each month is lower than under a zero-real-return assumption.
With $750,000 of retirement savings, a 5% nominal return and 2.5% inflation, the real annual return is about 2.44%. Over 30 years, the model supports about $2,929 per month from savings in today’s dollars.
Adding $2,000 of other monthly retirement income produces total modeled income of about $4,929 per month. Against a $5,000 target, the remaining gap is roughly $71 per month.
Using a Target Monthly Income
Adding a monthly target turns the cash-flow estimate into a planning check. Total monthly retirement income combines the modeled withdrawal from savings with the other monthly income entered above.
A target gap shows how much additional monthly income would be needed under the assumptions. Income above the target is shown as a surplus without labeling the plan as universally safe or unsafe.
Savings needed for target works in the opposite direction. After subtracting other monthly retirement income from the target, the calculator determines the starting savings balance required to fund the remaining monthly amount over the same time horizon and at the same real return.
For the $5,000 target in the example, $2,000 of other income leaves $3,000 per month to be funded from savings. Under the same 30-year return and inflation assumptions, the required starting balance is about $768,000, modestly above the $750,000 entered.
What Can Change Retirement Income
Time horizon has a direct effect on monthly income. Stretching the same savings across more years lowers the amount available each month, while a shorter drawdown period raises it. A longer horizon can be useful when planning for longevity risk, but the calculator does not predict lifespan.
Investment performance relative to inflation matters more than the nominal return alone. A 5% investment return with 2.5% inflation provides more real purchasing power than the same 5% return with 4% inflation.
Guaranteed lifetime income can reduce the amount that savings must provide. Defined-benefit pensions and certain annuities may continue for life, while Social Security benefits depend on the worker’s earnings and claiming history. Savings withdrawals do not carry the same lifetime guarantee unless an insurance product specifically provides one.
Taxes can also change spendable income. Traditional IRA and 401(k) withdrawals are generally taxable except for previously taxed basis or other tax-free amounts, while qualified Roth distributions can be tax-free. Because account mix and tax rates vary widely, the calculator reports pretax retirement cash flow rather than attempting a generic after-tax estimate.
Limits of the Projection
Smooth investment returns are the largest simplification. Real portfolios experience gains and losses in an unpredictable order, and poor returns early in retirement can reduce portfolio longevity even when the long-run average eventually matches the assumption.
Spending rarely remains perfectly level in real terms either. Housing, travel, healthcare, family support and other costs can move differently from broad inflation, so actual withdrawals may rise or fall over time.
Required minimum distributions are not included. Traditional IRAs and many employer retirement accounts generally require distributions beginning at the applicable age, while Roth IRAs and designated Roth workplace accounts do not require lifetime distributions for the original owner under current rules.
Annuity pricing is also outside the model. Insurance-company lifetime income depends on age, interest rates, mortality assumptions, contract features and insurer pricing. Monthly withdrawal results are mathematical spend-down estimates, not guaranteed lifetime annuity quotes.
Revisiting the calculation periodically can be more useful than treating one retirement-date estimate as permanent. Updated balances, spending targets, Social Security estimates and market assumptions can materially change the amount of income a portfolio may support.
Frequently Asked Questions (FAQs)
How much monthly income can $750,000 provide in retirement?
The answer depends on the time horizon and real investment return. With a 30-year horizon, 5% nominal return and 2.5% inflation, the calculator estimates roughly $2,929 per month from savings in today’s dollars.
Does the calculator use the 4% rule?
No. It solves for a level monthly real withdrawal over the selected number of years. The implied first-year withdrawal rate appears in calculation details, but no fixed withdrawal-rate rule determines the result.
How should I enter Social Security?
Enter the monthly benefit estimate that matches the claiming scenario you are planning to use. A personal my Social Security account provides benefit estimates based on the official earnings record and different claiming ages.
Does the retirement income estimate last for life?
No. The selected number of years is a planning horizon. Savings are modeled to be spent down over that period, with no lifetime guarantee.
What happens if inflation is higher than investment returns?
Negative real returns are preserved rather than replaced with a zero-growth assumption. Higher inflation relative to investment performance reduces the level of monthly purchasing power the starting balance can support.
Are taxes included?
No. Tax treatment depends on the mix of traditional, Roth and taxable assets, as well as household income and future tax law. Results are shown before account-specific income taxes.