Annuity Payout Calculator

The annuity payout calculator starts with a lump sum and solves for income. Instead of asking how a series of deposits grows, it asks how much a balance can pay out over a fixed number of periods while still ending near a target final balance. That makes it a focused drawdown tool for retirement income planning, settlement analysis, and fixed-term annuity comparisons.

This page is distinct from the annuity calculator, where you enter a withdrawal amount and see the remaining balance. Here, the payment is the unknown. It is also different from the present value of annuity calculator, which values a known payment stream today, and from the future value of annuity calculator, which grows deposits forward. If payouts begin after a savings period, the deferred annuity calculator combines accumulation and payout phases.

How the calculator works

The form asks for the initial balance, target final balance, annual annuity rate, length of annuity, payout frequency, compounding frequency, and annuity type. The calculation requires nonnegative balances and a nonnegative rate, plus a positive term. It rounds years times payout frequency to get the number of payouts.

The annual rate is treated as a nominal annual rate. The calculator first converts it to an effective annual rate using the selected compounding frequency. Then it converts the effective annual rate to the rate for each payout period. This step lets monthly payouts and quarterly compounding, for example, work together in one consistent periodic rate.

Formula

Let PV be the initial balance, FV be the target final balance, r be the effective rate per payout period, and n be the rounded number of payouts. The calculator uses this ordinary annuity factor:

$\text{annuity factor} = \frac{1 - \frac{1}{(1+r)^n}}{r}$

Then it solves for the payout:

$\text{payout} = \frac{\text{PV} - \frac{\text{FV}}{(1+r)^n}}{\text{annuity factor}}$

For annuity-due payouts, the denominator is multiplied by one extra timing factor:

$\text{due denominator} = \text{annuity factor} \times (1+r)$

Because beginning-of-period payouts leave the account earlier, this timing adjustment makes the payout slightly smaller when the rate is positive. If the rate is zero, the annuity factor becomes the number of payouts, and the payment is simply the amount to be spent down divided by that count.

Example

The default inputs are a $100,000 initial balance, a $0 target final balance, a 5% annual rate, a 10-year term, monthly payouts, monthly compounding, and ordinary end-of-period timing. The number of payouts is 10 times 12, or 120.

With monthly compounding, the effective annual rate is about 5.1162%. The rate per monthly payout period is 0.4167%. The ordinary annuity factor is about 94.281350328. Because the target final balance is zero, the numerator is the full $100,000. Dividing $100,000 by the factor gives a regular payout of $1,060.66 at the end of each month.

The calculator also reports total withdrawn of $127,278.62. Interest supporting payouts is total withdrawn plus final balance minus initial balance, so it is $27,278.62. If you switch only the timing to annuity due, the payout becomes $1,056.25 because each payment is taken at the beginning of the month.

Ordinary payouts versus annuity due payouts

Ordinary payout timing is common when withdrawals are taken after the period has passed. Due timing fits payments made at the start of each period, such as income needed on the first day of the month. The difference is not about preference; it changes how long the remaining money can compound.

When payments are at the end of the period, the balance earns interest before that period’s withdrawal. When payments are at the beginning, the withdrawal is removed before the period’s interest is earned. Therefore, beginning payouts are lower for the same balance, rate, term, and final-balance target.

Insurance product versus payout math

This calculator solves a fixed-period payout equation. A commercial annuity contract can be much more complex. A life income annuity may pay for as long as the annuitant lives rather than for a fixed number of months. A fixed indexed annuity may credit interest using caps, spreads, participation rates, and index terms. Variable annuities may include investment subaccounts and separate rider charges.

Those product features can be valuable or costly, and they are not included here. The calculator is best used to understand the transparent math behind a level payout before comparing product illustrations, surrender periods, beneficiary options, inflation features, and tax consequences.

Tips for reliable payout estimates

• Decide whether the target final balance should be zero or a reserve. A reserve lowers the payout but leaves more flexibility.
• Use a conservative net rate if the money will be invested during the payout period.
• Match payout frequency to your spending plan. Monthly income needs should use monthly payouts.
• Test longer life or longer spending periods to understand longevity risk.
• Compare the calculated payout with Social Security, pensions, portfolio withdrawals, and cash reserves rather than viewing it in isolation.

Informational note

This result is educational and not a recommendation to buy, sell, or annuitize. Fixed-income planning should consider taxes, inflation, liquidity, insurer strength, fees, contract guarantees, survivor needs, and the risk of outliving assets.

Sources

• SEC Investor.gov, Annuities — overview of annuity contracts, types, income streams, and investor considerations.
• FINRA, Annuities — overview of annuity products and investor considerations.