Single Premium Immediate Annuity: How a SPIA Turns a Lump Sum Into Income

A single premium immediate annuity, usually shortened to SPIA, is the simplest annuity there is: you hand an insurance company one lump sum, and in return it pays you a guaranteed income that begins almost straight away, usually within a month to a year. There is no accumulation phase, no market exposure inside the basic version, and no decision to make later about when to switch income on. You exchange a pile of money you control for a stream of payments you cannot outlive, if you choose that option. This guide explains the mechanics most sales pitches skip: how the payment is calculated, the payout options that change everything, what you give up, and how the income is taxed. All figures here are illustrative; rates change constantly, so treat any number as an example and confirm a live quote before acting.

The appeal of a SPIA is its plainness. Most annuity confusion comes from products that bolt on market-linked growth, riders, caps, and surrender schedules. A basic SPIA strips that away. It is closer in spirit to a private pension you buy for yourself: capital in, income out, for a defined period or for life.

How a SPIA Actually Works

You pay a single premium once. The insurer pools your money with that of many other annuitants and uses three ingredients to set your payment: prevailing interest rates, your life expectancy, and the payout option you select. Because the income starts immediately, there is no deferral period for the money to grow first. This is the defining difference between an immediate annuity and a deferred one, which is worth understanding before you commit; see immediate vs deferred annuities for the full comparison.

The mechanism that makes lifetime income possible is the pooling of mortality risk. Annuitants who die earlier than expected effectively subsidise those who live longer, and the insurer prices this in as what the industry calls mortality credits. That is why a SPIA can pay out more per year than you could safely withdraw yourself from the same lump sum invested conservatively: part of each payment is a return of your own capital, part is interest, and part is the benefit of the pool. The trade is that, in the basic life-only version, you give up access to the capital.

A SPIA can be funded with qualified money (from an IRA or workplace plan) or non-qualified money (already-taxed savings). That choice drives the tax treatment, which I cover below, and it also interacts with required minimum distribution rules for qualified accounts.

The Payout Options That Change Everything

The single most important decision with a SPIA is the payout option, because it determines both how much you receive and what happens when you die. The same premium can produce very different incomes depending on the structure you pick.

• Life only (single life). Pays the highest income because the insurer's obligation ends when you die. If you die early, there is no further payment to anyone. This maximises income but carries the most risk of a poor outcome for your heirs.
• Life with period certain. Pays for life, but guarantees payments for a minimum number of years (for example, ten or twenty). If you die within that window, a beneficiary receives the remaining guaranteed payments. The income is slightly lower than life-only in exchange for that floor.
• Joint and survivor. Pays for as long as either you or a second person (usually a spouse) is alive. You can set the survivor's payment at the full amount or a reduced percentage. Because two lives are covered, the starting income is lower.
• Cash or installment refund. Guarantees that total payments will at least equal your original premium. If you die before recovering it, the balance goes to a beneficiary. This protects your principal at the cost of a lower payment.

A simple illustration of the trade-off: imagine a 65-year-old funding a SPIA with the same lump sum. A life-only option might quote the highest monthly figure, a life-with-20-years-certain option a somewhat lower one, and a joint-and-survivor option lower still. Those relationships hold even though the actual numbers move with rates and age. The point is that "how much does a SPIA pay" has no single answer until you fix the payout option. Our walkthrough of how much a $100,000 annuity pays per month shows how the same premium shifts across these structures.

What Drives the Payment Amount

Three levers move your income, and it helps to know which you control and which you do not.

Interest rates. SPIAs are sensitive to the rate environment when you buy. Higher prevailing rates generally mean higher payments, because the insurer can earn more on the reserves backing your contract. This is why timing and shopping around matter, and why a quote is only good for a short window.

Your age and the second life. Older buyers receive higher payments per dollar of premium, because the expected payout period is shorter. Adding a younger joint annuitant lowers the payment because it lengthens the expected obligation.

Options and riders. Every guarantee you add — a period certain, a refund feature, an annual cost-of-living increase — lowers the starting payment. An inflation-adjusted SPIA, for instance, typically starts noticeably lower than a level one, then rises over time. Whether that trade is worth it depends on how long you expect to draw the income.

Because all of this is priced by the insurer's actuaries, the only number that matters is a live quote for your exact age, premium, and option. Anything you read in an article, including here, is structure, not a price.

What You Give Up: Liquidity and Inflation

A SPIA buys certainty, and certainty has a cost. The two big ones are liquidity and inflation.

Liquidity goes first. In a basic SPIA, once the income starts you generally cannot get the lump sum back. There is no surrender value to draw on in an emergency, unlike a deferred annuity that still has an account balance during its early years. This is why advisers commonly suggest annuitising only part of a portfolio, leaving other assets accessible. Putting every dollar into a life-only SPIA can leave you income-rich but cash-poor.

Inflation is the quieter risk. A level SPIA pays the same nominal amount for decades, so its purchasing power erodes year after year. An inflation-linked option addresses this but starts lower, and the breakeven can be many years out. Neither choice is wrong; they suit different priorities. The key is to make the decision deliberately rather than default into a level payment because the headline number looks bigger.

There is also credit risk to consider. A SPIA is only as secure as the insurer behind it. State guaranty associations provide a backstop up to state-specific limits if an insurer fails, but those limits vary and are not a substitute for choosing a financially strong company. Spreading large premiums across more than one insurer is a common way to stay within guaranty coverage.

How SPIA Income Is Taxed

Tax treatment depends entirely on the source of the money. With a qualified SPIA bought inside an IRA or workplace plan with pre-tax dollars, essentially the entire payment is taxable as ordinary income, because none of the money has been taxed yet.

With a non-qualified SPIA bought with after-tax savings, the IRS uses an exclusion ratio. Each payment is split into a tax-free return of your original principal and a taxable portion representing earnings. The exclusion applies until you have recovered your full cost basis; payments received after that point generally become fully taxable. This is gentler year to year than pulling lump sums from a deferred annuity, which the IRS taxes on a last-in, first-out basis. The mechanics are covered in our guide to how annuities are taxed. Tax rules change, so confirm the current treatment with the IRS or a tax professional before relying on any of this.

Where a SPIA Fits in a Retirement Plan

A SPIA is a tool for covering essential, must-pay expenses with guaranteed income, so that market swings affect only your discretionary spending. Many people use one to fill the gap between guaranteed sources such as Social Security and their actual baseline costs, then keep the rest of their savings invested for growth and flexibility. That layering approach is part of broader retirement income planning, and a SPIA is one component of it rather than a complete plan.

It tends to suit people who value predictability over control, who worry about outliving their money, and who have other liquid assets for emergencies. It tends to fit poorly for those who need ongoing access to the capital, who have a shortened life expectancy, or who already have ample guaranteed income. As with any annuity, the decision is about matching the product to the job, not about whether annuities are "good" or "bad" in the abstract. If you are new to the category, start with what an annuity is.

This article is educational and not personal financial advice. SPIA quotes, tax rules, and guaranty limits change and vary by insurer and state. Get current quotes from more than one provider and confirm the tax and protection details for your situation before acting.

Single Premium Immediate Annuity: Frequently Asked Questions

How soon does a SPIA start paying?

Income from a single premium immediate annuity typically begins within one month to one year of purchase, depending on the payment frequency you choose (monthly, quarterly, or annual) and the insurer's rules. That immediate start is what distinguishes it from a deferred annuity, where income begins years later after an accumulation period.

Can I get my money back from a SPIA?

In a basic life-only SPIA, generally no — once income begins, the lump sum is committed and there is no surrender value. If preserving access to principal matters, options like a period certain, a cash or installment refund, or annuitising only part of your savings provide some protection, though each lowers the income. Read the contract carefully before committing.

Is SPIA income taxed?

Yes, but how depends on the funding source. A SPIA bought with pre-tax (qualified) money is generally fully taxable as ordinary income. A SPIA bought with after-tax (non-qualified) money uses an exclusion ratio, so part of each payment is a tax-free return of principal and part is taxable earnings until your basis is recovered. Confirm current rules with the IRS.

What happens to a SPIA when I die?

It depends on the payout option. Life-only pays nothing further. Life with period certain pays any remaining guaranteed payments to a beneficiary. Joint and survivor continues to the second person. A cash or installment refund returns any unrecovered premium. Choosing the option is the main way you control what your heirs receive.