What it means
The mechanics are simple. You pay a single premium, income begins within about a month to a year, and the insurer takes on the risk that you live longer than expected.
That last point is the real product being sold, and it is called longevity insurance. The price of the income depends on your age, your health, current interest rates and the options you attach.
An older buyer gets a higher monthly payment for the same premium because the insurer expects to pay for fewer years, and rising interest rates lift payouts across the board. The trade-off is loss of control.
In most cases the capital is gone the moment the contract starts, so it cannot be drawn on for a medical emergency or left to children unless you pay for a guarantee period or a return-of-premium feature, each of which lowers the monthly income. Several common variants adjust the risk.
A joint-life annuity continues paying a surviving spouse, an inflation-linked annuity starts lower but rises each year, and a period-certain annuity guarantees payments for a set number of years even if the holder dies early. Each option costs income, and choosing them all can cut the starting payment substantially.
Immediate annuities are usually sensible for covering essential fixed costs rather than an entire retirement. The typical advice is to buy enough guaranteed income to cover housing, food and utilities, and keep the rest of the portfolio invested where it stays flexible.
In practice
Real-world examples.
Example
A retiring civil engineer with $900,000 in savings uses $400,000 to buy an immediate annuity that, combined with his state pension, covers his mortgage-free household's fixed monthly costs. The remaining $500,000 stays invested for travel, home repairs and unexpected costs.
Example
A widow aged 74 who worries mainly about outliving her money converts part of an inherited portfolio into a single-life immediate annuity. She accepts the lower income from adding a ten-year guarantee period so that her daughter receives the remaining payments if she dies early.
Example
A small business owner selling her company at 62 buys an inflation-linked immediate annuity with part of the proceeds. The starting income is roughly a third lower than the level-payment version, which she accepts because she expects to need the money for thirty years.
Think of it
“Immediate annuity starts paying right away-lump sum in, income stream out.
Formula
Calculation
Annual income = premium x payout rate; monthly income = annual income / 12
Suppose a 67-year-old buys a single-life immediate annuity with a premium of $500,000 and the insurer quotes an annual payout rate of 6.0%. The annual income is $500,000 x 6.0% = $30,000, which is $30,000 / 12 = $2,500 a month for life.
A useful sense check is the simple payback point, ignoring interest: $500,000 / $30,000 = 16.7 years, so the buyer recovers the original capital a little before age 84. Live longer than that and the insurer is paying out of its own pocket, which is precisely the risk being transferred, while dying earlier means the estate receives nothing unless a guarantee period was purchased.Case study
Seen in the real world.
Ravensmere Bakery is a fictional business used in this illustrative example. Its founder, Tomas, sold the business at 68 for a net $1,200,000 and immediately faced a question he had never had to answer: how to turn a pile of capital into a monthly wage.
Working with an adviser, he split the money. He used $500,000 to buy an immediate annuity paying $2,500 a month for life, which together with his other pension covered every fixed cost his household had: rates, insurance, food, utilities and the car. The remaining $700,000 stayed in a diversified portfolio.
The illustrative point is behavioural as much as financial. Because his essential costs were covered by an income that could not fall, Tomas stopped checking his portfolio during market drops and stopped selling investments at the worst moments. The annuity bought him a lower expected return on part of his capital and a much better chance of leaving the rest alone.
Watch out
Common mistakes.
- Annuitising most of a portfolio at once, which removes the flexibility to handle a large medical bill or a change in circumstances.
- Comparing the payout rate to an investment return, when the payout includes a return of your own capital and is not a yield.
- Ignoring inflation on a level-payment annuity, where a fixed $2,500 a month buys visibly less after fifteen years of rising prices.
Questions
People also ask.
What happens to my money if I die early?
With a plain single-life annuity, payments simply stop, which is why guarantee periods and joint-life options exist.
Do rising interest rates make annuities better value?
Generally yes, because insurers price payouts partly off long-term bond yields, so the same premium buys more income when rates are higher.
Is an immediate annuity the same as a deferred annuity?
No, an immediate annuity starts paying almost straight away, while a deferred annuity accumulates value first and begins income at a chosen future date.
From the founder's library

Take it further with the book.
Build your financial confidence beyond this definition. Shihan's full-length guide, Accounting Fundamentals, takes the same plain-English approach and turns it into a complete, practical playbook for non-finance managers, business owners and students - with chapter-end quiz answers and presentation slides included.
25% off with code MMHQ25, applied at checkout. Priced in USD - checkout may show the equivalent in your local currency.
View the book and save 25%Related
