Annuity Payout Calculator
Estimate regular annuity payouts based on your balance, rate, and payout period.
Based on a starting balance of $100,000 over 20 years at 5% annual interest.
Amortization Schedule
| Year | Starting Balance | Interest Earned | Principal Withdrawn | Ending Balance |
|---|
What This Calculator Does
This annuity payout calculator estimates the regular income you can expect from a lump sum of money over a fixed period. It answers a straightforward question: if you have a specific balance earning a given interest rate, how much can you withdraw each month, year, or other interval before the money runs out?
The calculation is based on the standard annuity payout formula, which accounts for the time value of money. It assumes a fixed interest rate and a fixed payout schedule, making it suitable for planning retirement income, structured settlements, or any scenario where you need to convert a lump sum into a steady stream of payments.
How the Calculation Works
The calculator uses the present value of an annuity formula to determine the periodic payment amount. The core logic is:
P = PV × [r(1 + r)^n] / [(1 + r)^n – 1]
Where:
- P = periodic payment (the payout amount)
- PV = present value (your current balance or lump sum)
- r = periodic interest rate (annual rate divided by number of payments per year)
- n = total number of payments (payout period in years × payments per year)
This formula assumes payments occur at the end of each period (ordinary annuity). If you select "beginning of period," the calculator adjusts by multiplying the result by (1 + r), reflecting that each payment earns interest for one additional period.
How to Use the Calculator
Enter your current annuity balance, the annual interest rate you expect to earn, and the total payout period. Choose your preferred payout frequency — monthly, quarterly, semi-annually, or annually — and whether payments are made at the beginning or end of each period.
The calculator will instantly show your estimated periodic payout. You can adjust any input to see how changes affect your income stream.
Understanding Your Results
The result is the amount you can expect to receive each period. This is a fixed payment that will continue for the entire payout period you specified, assuming the interest rate remains constant.
Key things to note:
- Total payments received is simply the periodic payout multiplied by the total number of payments. This represents the gross amount you will receive over the full term.
- Total interest earned is the difference between total payments received and your initial balance. This shows how much of your income comes from investment returns rather than your original principal.
- The calculator assumes the interest rate stays the same for the entire payout period. In reality, rates can fluctuate, which would change your actual income.
Common Mistakes to Avoid
- Confusing annual and periodic rates. If you enter an annual rate of 6% but select monthly payments, the calculator automatically converts to a monthly rate. Do not manually divide the rate yourself.
- Mismatching payout period and frequency. If you want income for 10 years with monthly payments, enter 10 years and select monthly frequency. The calculator handles the conversion.
- Ignoring inflation. The result is in nominal dollars. A fixed payment of $1,000 today will have less purchasing power in 15 years. Consider this when planning long-term income.
- Assuming constant returns. The calculation assumes a fixed interest rate. Actual investment returns vary, which can cause your balance to deplete faster or slower than projected.
Practical Use Cases
- Retirement income planning. Estimate how much monthly income a lump sum from a 401(k) or IRA can provide over a chosen withdrawal period.
- Structured settlement evaluation. Determine the periodic payments you could receive from a lump sum settlement.
- Lottery or inheritance management. Compare taking a lump sum versus receiving payments over time.
- Annuity product comparison. Evaluate whether a quoted annuity payment aligns with your expectations based on the premium and terms.
Limitations
This calculator provides an estimate based on a fixed interest rate and fixed payout schedule. It does not account for:
- Variable or adjustable interest rates
- Inflation adjustments (cost-of-living increases)
- Fees, commissions, or surrender charges
- Tax implications of withdrawals
- Survivor benefits or joint-life payout options
- Guaranteed minimum payout periods
For personalized financial advice, consult a qualified professional who can consider your full financial situation and the specific terms of any annuity contract.
FAQ
What is the difference between an ordinary annuity and an annuity due?
An ordinary annuity makes payments at the end of each period. An annuity due makes payments at the beginning. Because annuity due payments are received earlier, each payment has more time to earn interest, resulting in a slightly higher periodic payout. The calculator lets you choose between both options.
Can I use this calculator for a lifetime annuity?
No. This calculator assumes a fixed payout period (e.g., 20 years). A lifetime annuity pays income until death, which requires actuarial assumptions about life expectancy. This tool is designed for period-certain annuities only.
Why does the total interest earned seem low?
As you withdraw money, your remaining balance shrinks. Less principal means less interest earned over time. This is normal for any amortizing payout structure. The earlier you withdraw funds, the less opportunity they have to generate returns.
Does this calculator account for taxes?
No. The result is a pre-tax estimate. Depending on the type of account (taxable, tax-deferred, or tax-free), your actual after-tax income may be significantly different.
What if I want to change the payout amount instead of the balance?
This calculator solves for the payment given a fixed balance. If you know the desired payment and want to find the required balance, you would need a different calculation — typically the present value of an annuity formula solved for PV.