How a Single Premium Immediate Annuity Works and What It Costs

A single premium when ready annuity is an insurance contract you buy with one lump sum, and the insurance company starts paying you income within a few months

You hand over a block of money—say $200,000—to an insurance company. In return, that company promises to send you a fixed payment every month (or quarter, or year) for the rest of your life, or for a period you choose. The word "when ready" means payments begin soon after you buy it, not years later. The word "single premium" means you pay once, all at once, rather than making contributions over time.

This is different from other annuities where you pay premiums gradually, or where payments are delayed. A SPIA is the simplest form: money in, income out, for as long as you live.

Key Takeaways

• You pay one lump sum to an insurance company and receive monthly income for life, starting within a few months of purchase.
• The payment amount is locked in when you buy the contract and does not change, even if inflation rises or interest rates fall.
• The older you are when you buy, the higher your monthly payment will be, because the insurance company expects to pay you for fewer years.
• Once you buy a SPIA, you cannot get your money back or change the terms, so you should only use money you will not need for emergencies.

How the payment amount is calculated

The insurance company uses three main factors to decide how much you receive each month. First is your age—a 75-year-old gets a higher monthly payment than a 65-year-old buying the same contract, because the company expects to pay for fewer years. Second is your gender—in most states, women receive lower monthly payments than men at the same age, because women have longer life expectancy on average. Third is current interest rates—when rates are higher, your monthly payment is higher, because the insurance company can earn more from investing your lump sum.

You can also choose options that lower your payment. If you want payments to continue to a surviving spouse after you die, your monthly income will be smaller. If you want payments adjusted for inflation each year, your starting payment will be lower. These choices trade when ready income for protection or flexibility later.

Why someone would buy a SPIA

A SPIA turns a large sum of money into may provide income you cannot outlive. If you have a pension that is ending, or you received an inheritance, or you sold a business, a SPIA can convert that windfall into a paycheck for life. This is useful if you are worried about running out of money in retirement, or if you do not want to manage investments yourself.

A SPIA also removes investment risk. You do not have to decide whether to buy stocks or bonds, and you do not lose sleep if the market drops. The insurance company bears that risk, and in exchange, you accept a fixed payment that does not grow.

What you give up when you buy a SPIA

Once you sign the contract, you cannot change your mind or get your money back. If you need a lump sum for a medical emergency or a major repair, you have no access to your principal. Some SPIAs allow you to sell future payments to a third party (called a secondary market transaction), but you will receive far less than the payments are worth, and not all contracts allow this.

Your payment is fixed for life. If inflation rises to 5 percent per year, your purchasing power shrinks, but your check stays the same. Over 20 or 30 years, this can be a real loss. Some people buy an inflation-adjusted SPIA to protect against this, but the starting payment is lower, and you still cannot know whether inflation will be 2 percent or 5 percent.

If you die soon after buying the contract, your heirs receive nothing (unless you chose a period-certain option, which guarantees payments for a set number of years even if you die). This is why a SPIA works best for people with a long life expectancy and no dependents who rely on their assets.

SPIA versus other ways to create retirement income

Method	How it works	Main trade-off
SPIA	Pay lump sum, receive fixed income for life	No access to principal; income does not grow
Bonds or bond funds	Buy bonds, collect interest and principal at maturity	Interest rates may be low; you manage the portfolio
Dividend stocks	Buy stocks that pay dividends, reinvest or spend	Stock price can fall; dividends are not may provide
Withdrawal from savings	Spend down your savings at a planned rate	You must manage withdrawals; risk running out of money

What to check before you buy

The insurance company's financial strength matters. If the company fails, your payments may be protected by your state's insurance guaranty fund, but the protection has limits (usually $250,000 per contract). Check the company's rating with A.M. Best, Moody's, or Standard & Poor's before you commit.

Read the contract carefully for any fees, surrender charges, or restrictions. Some SPIAs charge a small annual fee; others do not. Some allow you to name a beneficiary to receive a lump sum if you die in the first few years; others do not. The contract will spell out exactly what you get and under what conditions.

Shop with at least three insurance companies. The same lump sum can produce different monthly payments depending on the company's assumptions about mortality and interest rates. A difference of 10 or 15 percent in your monthly payment is common, and that difference compounds over decades.

Common mistakes to avoid

Do not buy a SPIA with money you might need soon. This is not an investment you can exit. If you have medical bills coming up, or you are not sure whether you will stay in your home, keep that money liquid and buy a SPIA only with funds you are certain you will not touch.

Do not ignore inflation protection just because it lowers your starting payment. If you are in your 60s or early 70s, you may spend 30 or 40 years in retirement. Inflation at just 2 percent per year cuts your purchasing power in half over 35 years. An inflation-adjusted SPIA costs more upfront but protects you against a real risk.

Do not assume all SPIAs are the same. The contract terms, the company's financial strength, and the monthly payment can vary significantly. Spending an hour comparing three or four quotes can mean hundreds of dollars per year in additional income.

Frequently Asked Questions

Can I buy a SPIA with money in my IRA or 401(k)?

Yes. You can roll money from a traditional IRA or 401(k) into a SPIA within that same account. The monthly payments are treated as distributions and are taxed as ordinary income. You cannot buy a SPIA inside a Roth IRA, because Roth accounts have different withdrawal rules. Consult a tax professional about your specific situation.

What happens to my SPIA if I move to another country?

Most U.S. insurance companies will continue to pay you if you move abroad, but some restrict payments to certain countries or require additional documentation. Check your contract and contact the insurance company before you move. Some countries have tax treaties with the U.S. that affect how your payments are taxed.

Can I use a SPIA to cover just part of my retirement expenses?

Yes. Many people buy a SPIA to cover essential expenses—rent, utilities, food, insurance—and keep other savings for discretionary spending or emergencies. This approach gives you may provide income for necessities while preserving flexibility for the rest of your budget.

What if I want to leave money to my heirs?

A standard SPIA pays you for life and then stops; your heirs receive nothing. You can choose a period-certain option (payments may provide for 10, 15, or 20 years even if you die) or a life-with-period-certain option (payments for life, but if you die before the period ends, your heirs receive the remaining payments). These options lower your monthly payment.

How is the income from a SPIA taxed?

If you buy a SPIA with after-tax money, part of each payment is a return of your principal (not taxed) and part is earnings (taxed as ordinary income). The insurance company calculates this split using IRS life expectancy tables. If you buy a SPIA with pre-tax retirement account money, the entire payment is taxed as ordinary income. Consult a tax professional for your specific situation.