You've spent decades building a retirement corpus. Now comes the trickier question, how much of it to lock into a guaranteed income, and how much to keep free. Put too much into an annuity and you're stuck. Too little and you risk outliving your money. There's a sensible middle, and it's not a fixed percentage. Here's how to find yours.
So how much of the corpus belongs in an annuity?
There's no magic number, and anyone who gives you one is guessing. The right amount is enough to cover your essential expenses that aren't already handled by other guaranteed income, and no more than that. Annuitise the gap, invest the rest. That way your must-pay bills are safe for life, and the remaining money stays flexible for growth, emergencies, and rising costs.
Why not just annuitise the whole thing?
Because locking up everything creates its own problems. An annuity is illiquid, once the money's in, you can't pull out a lump sum for an emergency or a big expense.
It's also usually a fixed income, which inflation slowly eats away over a long retirement. And there's nothing left to grow, or to pass on to your family. Guaranteed income is valuable, but all of it, with none of your corpus doing anything else, leaves you exposed in different ways. Certainty you can't touch isn't the whole answer.
Why not skip the annuity entirely?
Because then you're carrying a risk most people underestimate: outliving your savings. If you keep everything invested and draw it down, a long life or a bad run of markets can leave you short in your eighties, exactly when you can't earn again.
An annuity is the one thing that pays no matter how long you live. That's its real job. Not maximising returns, but making sure you can't run the income dry. Skip it completely and you're betting your later years on your investments never letting you down. For most people, that's a bet worth hedging.
What's the right way to think about it?
As a floor. Work out your essential, non-negotiable expenses, the ones you'd have to pay whatever happens, and aim to cover those with guaranteed income for life.
A pension calculator helps you pin down what that income floor actually needs to be, month after month. Once you know the number, annuitising enough to cover it, and only that, protects your survival spending while freeing the rest of your corpus to work harder. Everything above the floor can afford to take some risk. The floor itself shouldn't.
Do you already have guaranteed income?
Check this before you annuitise a rupee, because it changes everything. If you've got a pension, an EPS payout, rental income, or anything that arrives for life, that already covers part of your floor.
You only need the annuity to fill the gap between what those cover and what your essentials cost. Someone with a solid existing pension might need very little annuity, or none. Someone with no guaranteed income at all needs more. Start from what you already have, then top up, rather than annuitising blind.
How much income does your corpus actually buy?
Worth checking with real numbers, because the answer surprises people. The income a given lump sum produces depends on rates, your age, and the annuity option you pick.
An annuity calculator shows you how much guaranteed income a slice of your corpus would actually generate. Play with it, if covering your floor takes a bigger chunk than you expected, that's useful to know now, not later. It turns "how much should I annuitise" from a guess into a calculation you can actually make.
Does the age you buy matter?
It does, and it works in your favour later. Annuity payouts tend to be higher the older you are when you buy, because the insurer expects to pay you for fewer years. So the same lump sum can buy more income at 70 than at 60.
That's an argument for not rushing to annuitise the whole floor the day you retire. Buying some now and some later, sometimes called laddering, can lift your average payout and spread out your exposure to whatever rates are doing at any one moment. You cover the essentials early, then top up on better terms as you age.
What should the rest of the corpus do?
Everything you don't annuitise should stay working. With your essentials covered for life, the remaining money is free to chase growth, stay liquid, and handle whatever the years throw up.
This is the part that fights inflation, funds the nice-to-haves, covers emergencies, and can pass to your family. Keeping a meaningful chunk invested and accessible is what stops a fully-annuitised retirement from feeling like a cage. The annuity gives you the floor. The invested rest gives you room to live and adapt.
What about inflation eating the annuity?
It's a real risk, and worth planning around. A fixed annuity pays the same amount for life, which sounds fine until you realise what that buys in 20 years' time is a lot less than today.
That's another reason not to annuitise everything. The portion you keep invested is what helps your overall income keep pace with prices. Some annuities offer an income that rises over time, which helps, though it starts lower. Either way, treat inflation as a factor, not an afterthought, when you decide how much to lock in.
Do you have to decide it all at once?
No, and it helps to know that. Annuitizing isn't a single, one-shot decision you're forced to make on day one of retirement. You can cover your basic floor first, then add more later as your needs settle and your other income becomes clearer.
That flexibility takes the pressure off getting it perfect immediately. Lock in enough guaranteed income to sleep at night, keep the rest working, and revisit the balance every few years. Retirement lasts a long time, and your plan is allowed to adjust as it goes.
The bottom line
How much of your corpus goes into an annuity isn't a fixed percentage, it's a calculation. Cover your essential expenses with guaranteed income for life, count what you already have first, and annuitise only the gap. Keep the rest invested for growth, liquidity, and inflation. Avoid both extremes, everything locked, or nothing guaranteed. Get the floor right, and the rest of your retirement can breathe.
Annuity rates, options, and tax rules vary by plan and change over time, and the income depends on the terms you choose. Investment returns aren't guaranteed, and the right split depends on your own finances. Terms and conditions apply, so check the details and consider speaking to an adviser before you commit.
