The Annuity Calculator determines the periodic payment an annuity will generate from a lump sum investment at a specified interest rate over a given number of years. Covers fixed immediate annuities, inflation adjustment, and the impact of starting age on retirement income planning.
$659.96
$7,919.47
$158,389.38
$58,389.38
80
years
$365.40
1.5839
$659.96
$7,919.47
$158,389.38
$58,389.38
80
years
$365.40
1.5839
You have a lump sum — what income can it reliably generate for the rest of your life? That question is at the heart of retirement planning, and annuities are one answer. The calculator for annuity payments converts a principal amount into a stream of periodic payments, showing both the nominal payout and the real (inflation-adjusted) purchasing power over time.
For a fixed immediate annuity paying out over N years at periodic interest rate r (= annual rate / payment frequency), the periodic payment PMT from principal PV is:
PMT = PV × [r(1+r)^N] / [(1+r)^N − 1]
This is the present value annuity formula. For a USD 500,000 annuity at 5% annual interest paying monthly over 20 years: r = 0.05/12 = 0.004167; N = 240; PMT = 500,000 × [0.004167 × (1.004167)^240] / [(1.004167)^240 − 1] = USD 3,299.78/month. Total payments over 20 years = USD 791,947 — USD 291,947 more than the initial investment, representing the interest earned. Use this online calculator for any combination of principal, rate, and term. The annuity payout calculator solves the related problem of how long a fund will last at a specified withdrawal rate.
This calculator models fixed annuities — where the payout rate is guaranteed by the insurer for the contract term. Variable annuities, where payments fluctuate with underlying investment performance, cannot be projected with a deterministic formula. Key characteristics of fixed annuities:
The inflation-adjusted (real) value of a fixed nominal payment PMT at inflation rate i after n years is:
Real PMT(n) = PMT / (1+i)^n
At 3% annual inflation, a USD 3,000/month nominal payment is worth only USD 2,214/month in real terms after 10 years — a 26% reduction in purchasing power. Some annuity products offer cost-of-living adjustment (COLA) riders that increase payments by a fixed percentage (typically 1–3%) annually, partially offsetting inflation at the cost of a lower initial payment. The retirement calculator and retirement calculators category model the full retirement income picture including Social Security, savings drawdown, and annuity income.
The case for annuities is fundamentally an argument about longevity risk — the risk of outliving your money. A 65-year-old retiree has roughly a 50% chance of living past age 85 and a 25% chance of living past 92. A self-managed portfolio drawdown plan optimized for average life expectancy will run out of money for the half of retirees who live longer than average. Life annuities pool longevity risk across many policyholders — those who die early effectively subsidize those who live long, providing certainty that portfolio drawdown cannot. The optimal retirement strategy for most people combines some annuity income (for baseline living expenses) with invested assets (for growth and flexibility).
The calculator uses the annuity payment formula: PMT = PV x r / (1 - (1+r)^-n), where PV is the lump sum investment, r is the periodic interest rate (annual rate divided by payment frequency), and n is the total number of payments (years times payment frequency). Total payouts equal the payment times the number of periods. Total interest is total payouts minus the original principal.
Compare total payouts to your original investment — the difference is interest earned. Higher interest rates and longer payout periods generate more total interest. If the periodic payment meets your income needs, the annuity is appropriately sized. If not, you may need a larger lump sum or should consider supplemental income sources.
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$200K at 5% provides $1,320/month for 20 years.
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$100K at 4% for 10 years yields $1,012/month.
An annuity is a contract between you and an insurance company where you make a lump sum payment (or series of payments) in exchange for regular income payments starting immediately or at a future date. It provides guaranteed income for a set period or for life.
The payment uses the present value of annuity formula: PMT = PV x r / (1 - (1+r)^-n). It calculates the equal payment that, combined with interest, will exactly exhaust the principal over the specified term.
Major types include fixed (guaranteed rate), variable (market-linked), indexed (index-linked with protection), immediate (payments start now), and deferred (payments start later). Each has different risk/return profiles.
For non-qualified annuities (funded with after-tax dollars), each payment is split between tax-free return of principal and taxable interest (exclusion ratio). For qualified annuities (IRA/401k funded), entire payments are taxed as ordinary income.
Most annuities have a surrender period (typically 5-10 years) during which withdrawals beyond a free amount incur surrender charges. After the surrender period, you can usually withdraw freely. Some annuities offer a bailout provision.
A life annuity pays income for as long as you live, regardless of how long that is. If you live to 100, payments continue. The risk is that if you die early, the insurance company keeps the remaining principal (unless you have a period-certain guarantee).
Higher interest rates mean higher payouts for the same investment. A 1% rate increase can boost monthly payments by 10-15% over a 20-year term. Purchasing when rates are high locks in better payments.
Fixed annuities typically have minimal explicit fees (built into the rate spread). Variable annuities often have mortality and expense charges (1-1.5%), administrative fees, sub-account fund fees, and optional rider fees totaling 2-3% annually.
Annuities provide longevity protection (guaranteed lifetime income) that bonds cannot. However, bonds offer more liquidity and control. A combination of both can be effective — annuity for essential expenses, bonds for discretionary spending.
It depends on the annuity type. A life-only annuity stops payments at death. A period-certain annuity pays beneficiaries for the remaining term. A joint-and-survivor annuity continues paying the surviving spouse.
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