Convert savings into a level monthly withdrawal over a chosen retirement period, then add Social Security and other income. The result is a planned cash flow, which includes spending principal. It is not a dividend yield, insured annuity quote or guaranteed lifetime pension.
Editorial Policy · Methodology · Corrections Policy
Before you enter your numbers
Use the retirement-date savings balance and the number of years it must support. Enter outside income on the same monthly and tax basis. The annual return is nominal and should reflect investment costs you expect to pay. No separate inflation increase is applied to the payment.
- Retirement savings
- Years the money needs to last
- Expected annual return
- Public pension or Social Security
- Other monthly retirement income
Input reference
- Retirement savings: The money available when the withdrawal period begins. Subtract any immediate lump-sum spending or reserve you intend to exclude before entering the balance. The model assumes the full entered amount can support payments.
- Years in retirement: The duration of the calculation in years. Longer periods give growth or withdrawals more time to operate. This is a chosen modeling horizon, not a prediction of an investment term or your lifetime.
- Annual return: An assumed nominal annual rate, divided by 12 in monthly projections. It is held constant. It is not a guaranteed yield, and the default should be replaced with an assumption suited to your scenario.
- Monthly Social Security: The monthly benefit you expect, ideally from an official statement. It is supplied by you rather than calculated from an earnings history. Check its start date and whether the statement uses current or future currency.
Formula and calculation method
For balance P, monthly rate i and n months, payment = P × i / [1 − (1 + i)^−n]. At zero return, payment is P / n. The formula targets a zero ending balance after the selected period, assuming the modeled return is earned every month.
Worked example
At zero return, 300,000 spread across 25 years provides 1,000 monthly. Add 1,500 of Social Security and 500 of pension income to reach 3,000 monthly before any unmodeled taxes. Extending the period to 30 years reduces the portfolio payment to about 833.
How to interpret the result
The result panel reports estimated monthly income from savings, total monthly retirement income and annual retirement income.
A fixed 3,000 payment does not buy the same basket of goods decades later. Compare its future purchasing power separately, or use the main retirement tool for real spending. Do not add income generated by the same portfolio again as other income; it is already included in the withdrawal calculation.
How savings are converted into monthly retirement income
The calculator treats the retirement balance as a pool that is drawn down over the number of years you select while the remaining balance continues to earn the return assumption. It solves for a level monthly withdrawal, then adds public pension and other recurring retirement income.
This is an amortization-style estimate, not a guarantee that a portfolio will produce the same amount every month. Taxes, investment volatility, required distributions and changing spending can alter the actual income available.
Separate withdrawals from investment earnings
A portfolio withdrawal can exceed the interest or dividends generated that month because part of the payment comes from selling assets. That is why the headline should not be interpreted as an investment yield. An annuity-payment formula can deliberately return principal over time.
List reliable outside income separately from portfolio withdrawals. Avoid adding rent before property costs, a pension before an elected survivor reduction, or an amount that has already been included in the starting portfolio. When comparing net living standards, also reserve enough of the gross payment for applicable taxes.
Match the income estimate to the spending it needs to cover
The estimated monthly income is most useful when compared with an actual retirement budget. Add predictable income sources such as pensions separately so you can see how much spending must be funded from invested savings. Avoid comparing a pre-tax income result with an after-tax spending target without an adjustment.
Try at least two retirement lengths and two return assumptions. A longer payout period normally reduces the amount that can be withdrawn each month from the same starting balance. This trade-off is central to retirement-income planning and is more meaningful than choosing a withdrawal percentage without a time horizon.
Connect Income To Your Budget
Use the monthly income estimate alongside your retirement budget, not as a replacement for it. If the income falls short, move to the retirement savings calculator to estimate the additional contribution needed or to the withdrawal calculator to test a different spending path.
Retirement planning guides · Calculation methodology
Rules and limits can change. Use these primary sources to verify time-sensitive details.
Retirement Income Calculator FAQs
Will this payment preserve my original capital?+
No. The payment formula is designed to spend down the starting balance over the selected years. Preserving capital or funding a bequest requires a lower withdrawal or a separate reserve.
Where can I check the assumptions behind this result?+
The income-method section shows how the balance is converted into a level monthly payment over the selected horizon. The methodology page explains the annuity convention and why the payment can include a return of principal.
What does the Retirement Income Calculator result include?+
The result focuses on estimated monthly income from savings, total monthly retirement income and annual retirement income. It is calculated from the inputs shown on this page rather than from live account, market or government data. Read the formula and limitations section before transferring the result into another planning tool.
What should I change when testing another Retirement Income Calculator scenario?+
Change one major assumption at a time so you can see what drives the result. Useful inputs to test include Retirement savings, Years the money needs to last, Expected annual return, Public pension or Social Security, Other monthly retirement income. Use a conservative case alongside your central estimate rather than relying on only the most favorable combination.
Can the Retirement Income Calculator replace an official statement or professional advice?+
No. It is a planning calculator. Income estimates depend on the retirement period and return assumptions. If you need income to last longer, the sustainable monthly amount generally falls. Use official statements and current rules when an exact legal, tax, pension or account figure is required.
