In the broadest sense an annuity is a series of equal payments made at regular intervals. In retail finance it usually means a contract with an insurer: you hand over a lump sum or a stream of contributions, and in return the insurer pays you an income, either for a fixed period or for the rest of your life.

What is the difference between an ordinary annuity and an annuity due?

An ordinary annuity pays at the end of each period; an annuity due pays at the beginning. Because every payment in an annuity due sits in the account one period longer, it is worth slightly more at the same rate and term. Rent and insurance premiums are annuities due; most loan payments are ordinary annuities.

What is the difference between a fixed and a variable annuity?

A fixed annuity credits a guaranteed rate set by the insurer, so the payout is predictable. A variable annuity invests in sub-accounts whose value moves with markets, so the payout can rise or fall. Fixed contracts trade upside for certainty; variable contracts do the reverse and usually carry higher fees.

Are annuities a good investment?

They suit a specific purpose - converting savings into income you cannot outlive - rather than serving as a general growth vehicle. The trade-offs are real: surrender charges, limited liquidity and fee structures that can be opaque. Compare the guaranteed income against what a diversified portfolio and a disciplined withdrawal plan would provide.

How are annuities taxed?

Growth inside an annuity is tax deferred until you withdraw. With a non-qualified annuity bought using after-tax money, only the earnings portion of each payment is taxable. With a qualified annuity held inside a retirement account, the full payment is generally taxable as ordinary income. Withdrawals before age 59 and a half may face an additional penalty.

Annuity Calculator

Future Value of Annuity

Understanding Annuities and Future Value

An annuity is one of the oldest ideas in finance: a stream of equal payments made at regular intervals. Whether you are contributing to one during your working life or drawing an income from one in retirement, the mechanics come down to a single question - what is a series of payments worth once interest has done its work?

How the Future Value of an Annuity Works

The future value of an annuity is what your contributions will be worth at the end of the term, once each payment has earned interest for however long it has been invested. The first contribution compounds for the entire term, the last for barely any time at all. That imbalance is why starting earlier matters so much more than contributing more later.

Three inputs drive the outcome:

1. Initial Investment

Any lump sum you start with compounds for the full term, so it does disproportionate work. A modest opening balance can outweigh several years of contributions made near the end.

2. Monthly Contribution

Regular payments are the engine of most annuities. Because each one starts earning as soon as it lands, consistency matters more than size - a small monthly amount sustained for twenty years typically beats a larger amount sustained for five.

3. Rate and Term

The interest rate determines how fast each payment grows, and the term determines how long it has to do so. Extending the term generally moves the result more than raising the rate, because compounding accelerates in the later years.

Accumulation and Payout

Most retail annuities have two distinct phases. During accumulation, you pay in and the balance grows tax deferred. During payout, or annuitisation, the insurer converts that balance into income. The size of that income depends on the accumulated value, your age, and whether you have chosen payments for a fixed term or for life.

Choosing a life payout transfers longevity risk to the insurer: they carry the cost if you live longer than expected. That guarantee is the core product an annuity sells, and it is priced accordingly.

Types of Annuity

Immediate annuities begin paying almost at once, usually purchased with a single lump sum at retirement.
Deferred annuities accumulate for years before payments start, which suits someone still working.
Fixed annuities credit a guaranteed rate.
Variable annuities invest in market-linked sub-accounts, with returns that can rise or fall.
Indexed annuities tie returns to an index while capping both gains and losses.

What to Watch For

Annuities are contracts, and the terms matter more than the headline rate.

Surrender charges can apply for years, making early exit expensive.
Fees on variable contracts - mortality and expense charges, administrative fees, sub-account expenses and riders - can stack up substantially.
Inflation erodes a fixed payment over a long retirement unless you buy an escalating option, which costs more up front.
Credit risk matters, because the guarantee is only as strong as the insurer standing behind it.

Using This Calculator

Enter your starting amount, what you intend to contribute each month, the rate you expect and the number of years until you need the money. The result shows the future value of the annuity - the balance you would have accumulated before any payout begins. Try adjusting the term by a few years to see how strongly the outcome depends on time rather than on the contribution itself.

Conclusion

An annuity is best understood as a tool for converting savings into certainty rather than as a way to maximise growth. Modelling the accumulation phase first tells you whether the eventual income is likely to be adequate, and gives you a concrete figure to weigh against the fees and restrictions any particular contract imposes.