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The exclusion ratio is the percentage of each annuity payment you receive that is treated as a tax-free return of your original investment, or cost basis, rather than taxable earnings. The IRS requires you to calculate this ratio using the "general rule" or the "simplified method" when you start receiving annuity income. You apply it to each payment throughout the period the IRS designates, after which the entire remaining payment becomes fully taxable.
The exclusion ratio solves a straightforward problem: you already paid income tax on the money you contributed to the annuity. The IRS does not tax you on that same money again when it comes back to you as a payment.
The formula divides your cost basis in the annuity contract by the expected total return from the contract. Your cost basis is the total of all after-tax contributions you made. The expected return is calculated using IRS actuarial tables that estimate how much you will receive based on your life expectancy at the time payments begin.
If your cost basis is $60,000 and the IRS calculates your expected total return as $100,000, your exclusion ratio is 60%. Each $1,000 monthly payment is split: $600 is tax-free return of basis and $400 is taxable income. You apply this ratio until you have recovered your full cost basis.
If your annuity comes from a qualified retirement plan such as a pension, 401(k), or 403(b), the IRS requires you to use the simplified method rather than the general rule. Under this method, you divide your total after-tax cost basis by a fixed number of expected monthly payments based on your age at the time you start receiving benefits. The IRS publishes the monthly payment count in IRS Publication 575.
For example, if you are 60 years old when payments begin, the IRS table assigns 310 expected monthly payments. If your after-tax cost basis is $31,000, each monthly payment has $100 of tax-free basis recovery ($31,000 divided by 310). After 310 payments, the full basis is recovered and the entire monthly payment becomes taxable.
Once you have received the number of payments needed to recover your entire cost basis, the exclusion ratio drops to zero. Every subsequent payment is fully taxable as ordinary income. If you die before recovering your full basis, you may claim the unrecovered basis as a deduction on your final tax return.
Annuity payments from contracts funded entirely with pre-tax dollars, such as a traditional IRA annuity, have no cost basis requiring exclusion. In that case, 100% of each payment is ordinary income and no exclusion ratio applies.
The exclusion ratio applies to fixed annuities with defined payout streams. Variable annuities, where payments fluctuate with investment performance, use a different IRS method to track basis recovery. Variable annuity distributions are generally taxed on a last-in, first-out basis in the accumulation phase: earnings come out first as taxable income before any tax-free basis is returned. The exclusion ratio only becomes relevant when a variable annuity is annuitized and begins making regular periodic payments.
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