SamCalculator

Annuity Calculator

Estimate annuity growth, future value, contributions, and long-term retirement accumulation with advanced annuity planning tools.

Steady, guaranteed-style growth — fixed annual rate the whole way.

Currency:

Starting Values

Existing balance you'll grow from
$

Contribution Settings

$

Contribution Timing

Growth Settings

Net of fees · tweak directly for custom rate
% p.a.

Time Settings

yrs

What is an Annuity?

An annuity is a long-term financial contract — usually purchased from an insurance company — that turns a lump sum or a stream of contributions into future income. You pay in during an accumulation phase, the balance grows tax-deferred at a guaranteed or market-linked rate, and then the contract pays out either a one-time future value or a stream of guaranteed payments during retirement.

Annuities live alongside (not instead of) your 401(k), Roth IRA, and brokerage account. Where market portfolios are designed to grow wealth, annuities are designed to convert wealth into a paycheck you can't outlive. Picking the right type, term, and contribution rate is what this calculator helps you do.

How Annuities Work

Every annuity has two phases: the accumulation phase (where contributions and interest grow inside the contract, tax-deferred) and the payout (annuitization) phase (where the balance is converted into periodic income). The future value of recurring contributions is calculated with the same compound annuity formula used for retirement accounts:

FV = P ×(1 + r)ⁿ − 1r× (1 + r)t

P = per-period contribution

r = per-period net return (annual rate ÷ frequency, net of fees)

n = total number of contribution periods

t = 1 for annuity due, 0 for ordinary annuity

Ordinary Annuity vs Annuity Due

AspectOrdinary AnnuityAnnuity Due
TimingPaid at the end of each periodPaid at the start of each period
CompoundingOne fewer period of growth per yearOne extra period of growth per year
Common examplesMortgages, bonds, loan EMIsRent, insurance premiums, lease payments
Future valueSlightly lowerSlightly higher (multiplied by 1 + r)

Fixed vs Variable Annuities

A fixed annuity pays a guaranteed minimum rate of return set by the insurance company. The growth is predictable and the income is contractually guaranteed — at the cost of upside if markets do well. A variable annuity invests contributions in sub-accounts (mutual-fund-like portfolios), so the future value depends on market performance. Variable contracts can be paired with riders that floor the downside, but those riders raise the annual expense.

The calculator's Variable mode runs the same plan against conservative, moderate, and aggressive return assumptions simultaneously, so you can see how much of the projected outcome is sensitive to a single return assumption.

Deferred and Immediate Annuities

A deferred annuity takes contributions today and starts paying income years (or decades) later — ideal if you're pre-retirement and want tax-deferred compounding plus a guaranteed income later. An immediate annuity (also called a Single Premium Immediate Annuity, or SPIA) is the opposite: you hand the insurer a lump sum, and they start paying you within 30 days. Immediate annuities are popular at retirement because they convert a portion of savings into a guaranteed paycheck.

For a more general one-time investment projection, see our Compound Interest Calculator. For retirement-corpus and withdrawal planning beyond the annuity, see the Retirement Calculator.

Tax-Deferred Growth, Inflation, and Fees

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Tax-Deferred Compounding

Interest and gains aren't taxed each year — only when you withdraw. Over decades, deferral noticeably increases the ending balance versus a taxable account at the same return.

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Inflation Drag

A nominal $1M future value at 3% inflation is roughly $554K in today's money after 20 years. The calculator surfaces this real value alongside the headline number.

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Fees Compound Too

A 1.5% annual fee on a $500K balance over 30 years quietly removes more than a quarter of the would-be ending value. Keep total expenses under 1% if you can.

Smart Annuity Strategies

  • 1.Start early. Compounding rewards time more than it rewards contribution size — a smaller amount over 30 years usually beats a larger amount over 10.
  • 2.Step up gradually. Raising contributions 3–5% per year mirrors typical wage growth and meaningfully lifts the long-term result without feeling painful.
  • 3.Mind the fees. Surrender charges, mortality and expense (M&E) fees, and rider costs can quietly stack to 2–3% — devastating over decades.
  • 4.Plan the payout phase. Decide ahead of time whether you want lifetime income, joint survivor income, or a fixed-period payout — the choice changes the monthly check significantly.
  • 5.Don't annuitize everything. Annuities are best as a slice of a broader plan that also includes Social Security, pensions, and a growth portfolio — see our Pension Calculator and Investment Calculator.

Disclaimer: Projections are based on the assumptions you enter and are for educational use only. Real annuity contracts include surrender charges, mortality and expense fees, rider costs, and tax treatments not fully modeled here. Variable annuities lose value when their underlying investments decline. Consult a fiduciary CFP, CPA, or licensed insurance adviser before purchasing any annuity product. SamCalculator earns no commission from any annuity provider.

Frequently Asked Questions

An annuity calculator estimates the future value of a series of regular contributions invested at a given rate of return over a set number of years. This tool extends the basic future-value formula into five integrated modules — fixed, variable, immediate, deferred, and retirement annuities — and adds inflation adjustment, tax-deferred growth, management fees, contribution step-ups, and one-time lump-sum additions. Inputs adapt to whichever annuity type you're planning, and the dashboard shows future value, contributions, interest earned, inflation-adjusted real value, growth multiple, effective annual return, retirement income, charts, and a full year-by-year schedule.

An ordinary annuity pays contributions at the end of each period (typical for loan EMIs, mortgages, and bonds), while an annuity due pays them at the start of each period (typical for rent, insurance premiums, and leases). Because annuity-due contributions are invested for one extra period each year, the future value is multiplied by (1 + r) relative to an ordinary annuity at the same rate. The difference looks tiny per period but compounds noticeably over 20–30 years.

Compound interest is the engine of annuity growth. Each period's interest is added to the balance and earns its own interest in subsequent periods. Over long horizons this exponential effect typically dwarfs the contributions — by year 25 of a moderate plan, the majority of the future value is usually interest, not money you put in. The Rule of 72 (years to double ≈ 72 ÷ rate) gives a quick mental check: at 6%, money roughly doubles every 12 years; at 8%, every 9 years.

Annuities are useful for the specific job of converting a portion of retirement assets into guaranteed lifetime income — something an ordinary portfolio cannot do without risk of running out. They are not usually a substitute for the growth portfolio (401(k), IRA, brokerage). A common framework: cover essential expenses with Social Security plus a base annuity, and let the rest of the portfolio grow for inflation protection and discretionary spending. Annuities tend to suit people without a traditional pension who fear longevity risk; they're less compelling for those with strong pensions or short life expectancies.

A deferred annuity has two phases. During the accumulation phase, you pay in contributions that grow tax-deferred. After a deferral period of years or even decades, the contract enters the payout phase and converts the accumulated balance into a stream of payments. Deferred annuities suit pre-retirees who want to lock in tax-deferred growth now and convert a known balance into guaranteed income later. The Deferred Annuity mode in this calculator models both phases on a single timeline so you can see balance, contributions, and eventual income.

Inside a non-qualified annuity (bought with after-tax money), growth is tax-deferred and only the earnings portion of each payout is taxed as ordinary income — the principal portion is a return of basis and is tax-free. Inside a qualified annuity (in an IRA or 401(k)), the entire payout is taxed as ordinary income because no taxes were paid going in. Early withdrawals before age 59½ usually trigger a 10% federal penalty in addition to ordinary income tax. The calculator's tax rate input applies a simple flat assumption to the payout phase so you can compare options on an after-tax basis; consult a CPA for the exact treatment in your situation.

Yes — significantly. A flat $40,000-per-year annuity income at 3% inflation buys only about $22,000 of today's goods after 20 years. Unless the contract has an inflation rider or COLA (cost-of-living adjustment), the nominal payout stays the same while purchasing power steadily falls. The Inflation Adjustment toggle in this calculator surfaces the inflation-adjusted real value next to the headline nominal value so the gap is obvious before you commit.

A fixed annuity is an annuity contract that pays a guaranteed minimum rate of return — typically set by the insurance company and locked for a multi-year term. The growth is predictable, the income is contractually guaranteed, and the contract usually has surrender charges if you withdraw early. Fixed annuities trade upside for certainty: you give up the chance of higher market returns in exchange for protection from market losses. Use the Fixed Annuity mode in this calculator to model a single guaranteed rate end-to-end.

A common framework is to first max out tax-advantaged growth accounts (401(k) employer match, then Roth IRA or Traditional IRA, then the rest of 401(k)), and only after that consider an annuity for the slice of retirement income you want guaranteed. Many advisors suggest annuitizing 25–40% of retirement assets — enough to cover essential expenses with guaranteed income while leaving the rest invested for growth and inflation protection. Use this calculator's Retirement Annuity mode to back-solve: enter the income you'd want in retirement and try contribution levels until the projected payout matches.

The future value of an annuity is the projected balance at the end of the accumulation phase, given a contribution amount, contribution frequency, rate of return, duration, and timing (ordinary vs due). The formula is FV = P × ((1 + r)ⁿ − 1) ÷ r, multiplied by (1 + r) for an annuity due. This calculator computes that future value, plus the inflation-adjusted (real) future value, total contributions, total interest, effective annual return, growth multiple, and a full year-by-year schedule — so you can see not just the final number but how it was built.

Pair this tool with our Retirement Calculator for a full retirement-corpus picture, our Pension Calculator to compare guaranteed income options, and our Inflation Calculator to stress-test purchasing power.

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