Annuity Calculator

An annuity is a financial product that provides a series of regular payments, either for a fixed period or for life, in exchange for an upfront lump sum or a series of contributions. Annuities work in two phases: the accumulation phase, where money grows through regular contributions or a single premium; and the distribution (payout) phase, where the account balance is converted into a stream of income payments. Insurance companies are the primary issuers of annuity products, but the underlying time-value-of-money math applies to any scenario with regular cash flows — pension plans, structured settlements, savings plans, and loan amortization all use annuity formulas.

The difference is the timing of payments. In an ordinary annuity (also called an annuity-in-arrears), payments are made at the end of each period — for example, at the end of each month. Most loans, mortgages, and insurance premium calculations use the ordinary annuity model. In an annuity-due, payments are made at the beginning of each period — for example, rent is typically due at the start of the month. Because each payment in an annuity-due has one extra compounding period, the future value of an annuity-due is always slightly higher than an equivalent ordinary annuity. The formula relationship is: FV (annuity-due) = FV (ordinary) × (1 + r), where r is the periodic interest rate.

A fixed annuity guarantees a specified interest rate for a set period, making it predictable and low-risk. The crediting rate is declared by the insurance company and does not fluctuate with market conditions. A variable annuity invests premiums in sub-accounts similar to mutual funds, meaning returns — and therefore future payments — can vary up or down with market performance. Variable annuities carry more risk but offer greater growth potential. A third type, the indexed annuity (fixed indexed annuity), credits interest based on the performance of a stock market index (like the S&P 500), subject to caps and floors, offering a middle ground. This calculator models a fixed interest rate appropriate for fixed annuities.

The taxability of annuity distributions depends on how the annuity was funded. If you purchased an annuity with after-tax (non-qualified) money, only the earnings portion (interest) of each payment is taxable as ordinary income — the return of your original principal is tax-free. This is calculated using an exclusion ratio. If the annuity is held within a qualified retirement account (IRA, 401(k)), all distributions are fully taxable as ordinary income because you received a tax deduction on the contributions. Annuity earnings grow tax-deferred, meaning you do not owe taxes until distributions begin. Early withdrawals (before age 59½) are subject to a 10% IRS penalty in addition to ordinary income taxes.

Insurance annuity products often carry several types of fees that are not reflected in the basic formula this calculator uses. Mortality and Expense (M&E) fees range from 0.5% to 1.5% annually and compensate the insurance company for the risk of providing income guarantees. Administrative fees add another 0.1%–0.3% per year. Variable annuity sub-account investment management fees mirror mutual fund expense ratios (typically 0.5%–2.0%). Rider fees for optional benefits — such as guaranteed lifetime withdrawal benefits (GLWB) or death benefit riders — add another 0.5%–1.5% annually. Surrender charges (early withdrawal penalties) can range from 5%–10% of contract value during the initial surrender period (typically 5–10 years). These fees can significantly reduce your actual returns versus the theoretical projections in this calculator.

The present value (PV) of an ordinary annuity is calculated with the formula: PV = PMT × [1 − (1+r)^(−n)] / r, where PMT is the periodic payment, r is the periodic interest rate (annual rate ÷ payment frequency), and n is the total number of payments. This formula answers: 'How much money do I need today to fund a series of equal payments in the future?' For example, to fund $1,000/month for 20 years at a 5% annual rate (0.4167% monthly), you would need approximately $151,525 today. For an annuity-due (payments at the beginning of each period), multiply the result by (1 + r). This is the same calculation used by the 'Distribute' mode of this calculator.

The appropriate interest rate depends on the type of annuity you are modeling. For insurance fixed annuities in 2024–2025, multi-year guaranteed annuities (MYGAs) are offering crediting rates of approximately 5%–6.5% for 3–7 year terms, competitive with CDs. For variable annuities, a conservative long-term market return assumption might be 5%–7% per year before fees (which could reduce net returns to 3%–5%). For personal finance planning scenarios not involving an insurance product, a common conservative assumption is 4%–6% for bond-heavy portfolios and 6%–8% for diversified stock/bond portfolios over long periods. Note that these are averages — actual returns fluctuate significantly year to year, and this calculator assumes a constant rate.