Annuities Explained: Trading a Lump Sum for Guaranteed Income for Life

An income annuity is a contract in which you give an insurance company a lump sum and, in return, it pays you a guaranteed income for the rest of your life. In plain terms, it is insurance against running out of money. You trade a pile of savings for a paycheck that keeps arriving no matter how long you live or what the stock market does. That certainty is the whole appeal, and it is also what you pay for, because in giving up the lump sum you give up flexibility.

When I was working out my own plan, every other thing I read online seemed to be trying to sell me an annuity, which made me suspicious of the whole idea. The truth is more balanced. An annuity is a genuinely useful tool for one specific job, covering income you cannot afford to lose, and a poor fit for almost everything else. This guide explains how they work without the sales pitch. For where annuities sit in the bigger picture, see retirement planning, and for the direct comparison, annuity vs drawdown.

How an income annuity works

You pay a lump sum once, and the insurer converts it into a stream of regular payments that continue for as long as the contract specifies, often your whole life. The amount you receive depends on how much you put in, your age, current interest rates, and the type of annuity you choose. Because the insurer is pooling many customers, some of whom will die early and some late, it can promise each person an income for life that an individual drawing down their own savings cannot guarantee for themselves.

This is the key difference from systematic withdrawals, where you keep the money invested and the value can fall. With an income annuity, the market is no longer your problem; the insurer carries that risk. In exchange, you generally cannot take the lump sum back. The income annuity is one of the main ways to turn savings into income, alongside drawdown, as covered in accessing your retirement savings.

Immediate vs deferred

An immediate annuity starts paying you income almost right away; a deferred annuity starts paying at a future date you pick.

• Immediate annuity: you hand over the lump sum and income begins within about a year. This suits someone retiring now who wants a paycheck immediately.
• Deferred annuity: income begins later, perhaps at 75 or 80. Because the insurer holds the money longer and you might not live to collect, a modest sum can buy a surprisingly large later income. A deferred annuity is essentially insurance against living a very long time and exhausting your other savings.

Some people use a small deferred annuity as a backstop, covering the risk of a 30-year retirement, while drawing down their other accounts in the meantime.

Single vs joint life

A single-life annuity pays the highest income but stops when you die; a joint-life annuity pays less to start but keeps paying a surviving spouse. This choice matters enormously for couples. If you take the single-life option for its larger payment and you die first, your spouse loses that income entirely. A joint-life annuity continues, often at a reduced rate such as half or two-thirds, to whichever of you lives longer.

For married couples this is a similar trade-off to the one in when to claim Social Security and Social Security spousal and survivor benefits: a bit less now in exchange for protecting the survivor.

Fixed vs variable

A fixed annuity pays a set, predictable amount; a variable annuity ties your payments to the performance of underlying investments, so they can rise and fall.

• Fixed annuity: the income is locked in and predictable. This is the version most people picture when they want certainty.
• Variable annuity: payments move with the markets, offering the chance of growth but also the risk of falling income. Variable annuities can lose value and tend to carry higher fees.

There are also indexed annuities that sit between the two, with returns linked to a market index but with caps and floors. These products can get complicated quickly, with layers of fees and riders, which is exactly why the SEC’s Investor.gov and FINRA urge you to read the contract closely and understand every charge before signing.

The pros and cons, honestly

The core trade-off is certainty in exchange for flexibility and cost. Weigh both sides:

• Pros: guaranteed income you cannot outlive; no market worry on the annuitized portion; simplicity once it is set up; peace of mind that essentials are covered.
• Cons: usually irreversible, so you lose access to the lump sum; fees can be high, especially on variable and indexed products; the guarantee depends on the insurer’s financial strength, not the federal government; basic annuities do not keep up with inflation unless you pay extra for an inflation rider; and there may be nothing left for heirs.

You do not have to annuitize everything, and most people should not. A sensible pattern is to cover your essential, must-pay spending with Social Security plus a modest annuity, then keep the rest of your nest egg invested for flexibility and growth. That way you get a guaranteed floor without locking up money you might need.

This is general information, not personalized advice. Annuities are contracts that are hard to undo, so before buying one, compare insurers, understand the fees, and ideally run it past a fiduciary advisor, as we cover in choosing a financial advisor. Free tools at Investor.gov and the Consumer Financial Protection Bureau can help you check products and avoid high-pressure sales, and steering clear of those is part of avoiding retirement scams.