How much of an annuitized payment is taxable?
Usually less than the whole amount, as long as the premium behind it came from money you had already paid tax on and you have since turned that contract into a series of payments. The IRS uses a formula called the exclusion ratio to split each check between a tax-free return of your own money and taxable interest the contract earned. That split gets locked in once, when payments begin, and it holds steady for as long as the payments continue. It only applies to non-qualified contracts that have been annuitized or bought as a single premium immediate annuity; a withdrawal you take before annuitizing, and any payment from a qualified account, are taxed under different rules entirely.
What the exclusion ratio does
The exclusion ratio is simply a percentage: the share of each payment from an annuitized contract that counts as a tax-free return of money you already paid tax on, versus the share that counts as taxable earnings. It only comes into play in two situations, when you annuitize a deferred annuity into a series of payments, or when you buy a single premium immediate annuity outright.
The IRS locks this percentage in at the moment your payment stream starts, and it does not move for as long as that stream continues. Every check for the rest of the payout period gets split the same way.
The logic behind it is fairly simple once you see it: the government does not tax you twice on money you already paid tax on once. When you deposited after-tax savings into the annuity, that principal was already run through your income tax return. Only the growth that built up inside the contract, the interest or gains layered on top of your deposit, is new income the IRS has never taxed. The exclusion ratio is just the mechanism that separates the two inside each payment.
The formula behind the ratio
Two figures drive the calculation. The first is your investment in the contract, which is just the after-tax cost basis you built up, meaning the premium dollars you paid with money that had already been taxed. The second is your expected return, the total amount you are projected to collect over the payout period, worked out either from IRS life expectancy tables or from a fixed term if your payout is not tied to how long you live.
Take your investment in the contract, divide it by your expected return, and the result is the exclusion ratio. Whatever percentage that produces is the portion of every payment that comes back to you tax-free. Everything left over is taxed as ordinary income.
The life expectancy figures behind the "expected return" side of the formula are not guesses. They come from actuarial tables built into the tax code, one for a single payee and a separate, longer one for a payout that covers two lives together. A carrier plugs your age (and, for a joint payout, your co-annuitant's age) into the applicable table to land on the projected number of payments, then multiplies that by your payment amount to get the expected return.
A worked example: a life-only SPIA
Picture a 68-year-old named James who puts $180,000 of savings into a non-qualified SPIA. The insurer quotes him $1,050 a month for the rest of his life.
His investment in the contract is the full $180,000, since it came entirely from after-tax savings. His expected return takes more work: the IRS life expectancy table for a 68-year-old projects roughly 17.6 more years, so his expected return works out to $1,050 multiplied by 12 months multiplied by 17.6 years, or about $221,760.
Dividing $180,000 by $221,760 produces an exclusion ratio of roughly 81.2%. Applied to his $1,050 monthly check, roughly $852.60 lands tax-free while $197.40 gets treated as taxable income. At a 22% federal bracket, that puts James's monthly tax bill near $43, versus a $231 hit had the whole check been fair game for taxation.
The bracket he lands in changes how much that split is worth to him. A retiree in a 12% bracket receiving the same $197.40 taxable slice would owe about $24 a month, while someone in a 32% bracket would owe closer to $63. Either way, the dollar amount subject to tax stays fixed by the exclusion ratio; only the rate applied to it moves.
What happens once your cost basis is fully recovered
The exclusion ratio only runs until your accumulated tax-free payments equal your total investment in the contract. Past that point, every payment that follows is fully taxable ordinary income, with no exclusion left to apply.
Back to James: his $180,000 basis gets recovered at $852.60 of tax-free income per payment, which takes about 211 months, or roughly 17.6 years. If he is still collecting checks at 85 or beyond, every one of those later payments is taxed in full.
That structure rewards longevity in an odd way. Living well past your projected life expectancy means a larger share of your income becomes taxable, but it also means you are collecting far more total payments than the IRS originally assumed, so the outcome still favors a long life overall.
Exclusion ratio for period certain and joint payouts
Not everyone chooses a life-only payment. Two common alternatives change how the exclusion ratio gets calculated.
Period certain payout
Pick a fixed term instead of a lifetime, and the expected return is simply your monthly payment multiplied by the number of months in that term, with no life expectancy table involved at all.
Say you put in $150,000 and receive $850 a month for 20 years. Multiply $850 by 240 months and the expected return comes to $204,000. Divide $150,000 by that figure and the exclusion ratio lands at about 73.5%, so out of each $850 check, roughly $624.75 is untaxed and the remaining $225.25 gets counted as income.
Joint and survivor payout
When a payout is built to continue for as long as either of two people is alive, most commonly a husband and wife, the IRS leans on a combined life expectancy figure, and that number always runs longer than either person's expectancy on their own. Stretch the same cost basis over a longer expected return and the exclusion ratio drops.
Take the same $180,000 deposit, but structure the payout around a couple where one spouse is 68 and the other is 65. Using the joint table, their combined life expectancy comes out to roughly 24.4 years, which puts the expected return at $1,050 multiplied by 12 months multiplied by 24.4, or about $307,440. Divide $180,000 by that number and the exclusion ratio comes out near 58.6%, lower than the single-life version, but the tradeoff is a payment guaranteed to keep going for longer.
Exclusion ratio vs. LIFO withdrawals
The exclusion ratio only governs payments after you have formally annuitized a contract. It has nothing to do with a partial withdrawal you take from a deferred annuity while it is still in the accumulation phase.
Take money out of a non-qualified deferred annuity without annuitizing it, and the IRS instead applies a "last in, first out" rule. Under LIFO, whatever gains have built up inside the contract are treated as coming out first, so every withdrawal is fully taxable until those gains are exhausted. Your tax-free cost basis only starts coming out after that.
Picture a hypothetical contract holding $180,000 in premium plus $40,000 of accumulated gains, for a total value of $220,000. Pull out $50,000 as a lump sum under LIFO and the first $40,000 of that withdrawal is fully taxable, since it represents gains, and only the remaining $10,000 comes out as tax-free basis. Compare that to an annuitized payout of the same contract, where every check would instead carry a fixed tax-free percentage from day one. The dollars taxed over time can end up similar, but the timing of the tax hit is very different.
For anyone building steady, planned income, the exclusion ratio is the more tax-friendly path in the near term. LIFO front-loads the tax bill on early withdrawals, which is a big reason people who want dependable income often annuitize rather than take money out piecemeal.
Does the exclusion ratio apply to qualified annuities?
No. A contract built with pre-tax dollars, say from a traditional IRA, a rolled-over 401(k) or another qualified plan, skips this calculation entirely. You already got a deduction when that money went in, so your cost basis sits at zero, and the whole distribution gets taxed on the way out. There is no split to speak of; a qualified contract's income counts as ordinary taxable income from the first dollar to the last.
The exclusion ratio exists specifically for non-qualified contracts. It is the IRS's way of making sure you are not taxed twice on money you already paid tax on once.
Roth IRA annuities
An annuity held inside a Roth IRA works differently again. Meet the qualified distribution rules, meaning the account has been open at least five years and you are at least 59 and a half, and payments come out entirely tax-free. There is no exclusion ratio to calculate at all, because none of the distribution is taxable in the first place. The exclusion ratio only matters outside of a Roth structure.
Keeping track of your exclusion ratio
Once your payments start, the insurance company should give you a breakdown showing the exclusion ratio itself along with the taxable and tax-free dollar amounts on each check. That same figure feeds directly into your annual tax paperwork.
Carriers generally issue a Form 1099-R each year, and box 2a on that form shows the taxable portion of what you received. If the exclusion ratio was calculated correctly, the numbers on that form should line up with the split you were originally quoted.
Hold onto your original application, the illustration that projected your payments, and any records of your original premium. If you moved money through a 1035 exchange before annuitizing, your cost basis carries over from the prior contract, so confirm the new carrier actually has that figure on file.
It is worth asking the carrier, before you annuitize, to show you the math behind the exclusion ratio in writing rather than accepting a single quoted percentage. That gives you something concrete to compare against your 1099-R each year, and it flags a mistake early if the carrier's records of your cost basis do not match your own.
Why the tax-free portion matters beyond your tax bill
A favorable exclusion ratio does more than shrink a single line on your tax return. It can shift other numbers that are tied to your reported income:
- Medicare premiums. Part B and Part D premiums scale with income, so a lower taxable amount from your annuity can help keep you out of a higher IRMAA bracket.
- Social Security taxation. Because your combined income sets how much of your Social Security check is exposed to tax, trimming the taxable slice of your annuity income can leave more of that benefit untouched.
- Required minimum distributions. A non-qualified annuity that lives outside an IRA is not on the hook for RMD rules to begin with. Once annuitized, it simply pays out on its own built-in schedule, with the exclusion ratio applying the entire time.
For a retiree with real after-tax savings who wants dependable income, a non-qualified SPIA or an annuitized contract using this formula can rank among the more tax-efficient ways to produce it. Our immediate annuity calculator can help you see what a given deposit might pay out monthly before you talk numbers with a strategist.
Frequently asked questions
Does the exclusion ratio ever change once it is set?
It does not. The percentage gets calculated once, when your payments start, and holds for as long as they keep coming. About the only event that would reset it is a change to the underlying payout structure itself, which almost never happens once annuitization is already underway.
What happens if I outlive my life expectancy?
Once the tax-free payments you have collected add up to your full cost basis, the exclusion ratio stops applying and every check after that point counts as fully taxable ordinary income. That is simply how the math resolves itself: the IRS assumed you would recover your basis over roughly your statistical life expectancy, so living well past it means a bigger taxable slice late in life, even as you keep cashing more checks than the table originally predicted.
What if I die before I get back my full cost basis?
On a life-only payout, the payments stop at death and the insurer owes nothing further. Tax-wise, the basis you never got back does not just vanish: whoever settles the annuitant's estate can generally write it off on the last return filed for that year. That is part of the tradeoff with a life-only payout, which usually produces the biggest check of any option. A period certain or refund payout guards against that outcome, though it trims the check size in exchange for the protection.
Does the exclusion ratio apply to income riders on a fixed index annuity?
It depends on how the money comes out. A guaranteed lifetime withdrawal benefit that pays income without formally annuitizing the contract is taxed under LIFO rules instead, meaning gains come out first, ahead of basis. The exclusion ratio only kicks in once the contract has genuinely been annuitized, and most income rider withdrawals never reach that bar, so LIFO is usually the rule in play. Read what your own contract actually says, or call the carrier to confirm, rather than assuming either way.
Can I work out my own exclusion ratio before I buy?
You can get a reasonably close estimate. Take your expected premium as the cost basis, get the insurer's projected monthly payment, and apply the appropriate IRS life expectancy figure from Publication 575. The carrier sets the official ratio at issue using IRS-approved tables, so treat your own math as a planning estimate rather than the final number. Ask for a personalized illustration before you commit; it should show the expected taxable and tax-free split.
Written and reviewed by
James Forren Warren
Licensed Retirement Income Strategist · License #20551202
James Forren Warren is a licensed Retirement Income Strategist with Tax Free Wealth Plan. For the past five years he has helped individuals and families turn their savings into retirement income they can count on. He writes and reviews the annuity research on this site and keeps it plain: what a product does, what it costs you, and who it actually fits.
Sources
Educational only, not investment, tax or legal advice. Tax Free Wealth Plan LLC is a licensed insurance agency, not a registered investment adviser or broker-dealer. Annuities are not bank deposits, are not FDIC insured and are not guaranteed by any government agency. Guarantees are backed solely by the claims-paying ability of the issuing insurance company. Features, rates and availability vary by state and change over time; the contract and disclosure documents govern.