72(t) RMD Calculation Method for SEPP: Formula, Table, and Form 5329

The 72(t) RMD calculation method for SEPP works by dividing your prior year-end retirement account balance by an IRS life expectancy divisor to produce that year’s distribution, then repeating the calculation with fresh numbers every year the plan runs. It is the simplest of the three IRS-approved ways to compute Substantially Equal Periodic Payments under Internal Revenue Code Section 72(t), and unlike the fixed amortization and fixed annuitization methods, it recalculates annually so payments rise and fall with the account balance.¹ A properly structured plan avoids the 10% additional tax that normally applies to withdrawals before age 59½.

The Formula and a Worked Example

The math is a single division: account balance divided by the life expectancy divisor for your current age. Your age for this purpose is whatever age you turn on your birthday during the distribution year, not your age on the date you take the payment.²

The IRS gives a concrete example on its SEPP guidance page. A 55-year-old with an IRA balance of $810,250 on December 31 of the prior year uses the Single Life Table, which gives a divisor of 31.6 at age 55. Dividing $810,250 by 31.6 produces an annual distribution of $25,641.³ That’s the total that must come out of the account during the calendar year. You can take it as a lump sum, in quarterly installments, or in monthly payments, as long as the yearly total matches. The first year is not prorated: starting in October still means taking the full annual amount for that year.

Which Account Balance to Use

Under the RMD method, the account balance for each distribution year is determined according to Treasury Regulation § 1.401(a)(9)-5, which means the balance as of December 31 of the prior year.⁴ The fixed methods allow a broader “reasonable valuation date” window; the RMD method does not.²

The year-end balance may be adjusted for contributions or forfeitures allocated after the valuation date, and decreased by distributions made after that date but still within the valuation calendar year.⁴ Keep the account statements that support every year’s balance figure. If the IRS ever questions the plan, those statements are your first line of defense.

Choosing a Life Expectancy Table

The divisor comes from a life expectancy table, and the table you pick directly controls the size of your payments. IRS Notice 2022-6 lets you choose from any of three:²

The Single Life Table is based solely on your age and produces the largest payments because the divisors are the smallest. At age 55, the divisor is 31.6.
The Uniform Lifetime Table, the same one retirees use for standard RMDs, has larger divisors and produces smaller annual payments.
The Joint and Last Survivor Table factors in the ages of both you and a designated beneficiary. A significantly younger beneficiary makes the divisor larger still, producing the smallest possible payments. You must have named an actual beneficiary on the account to use this table.

The catch: once you pick a table, you must use it every year for the life of the plan.² If you start with Single Life, you cannot switch to Uniform Lifetime two years later because the payments feel too high. The table choice is the one real lever you have for sizing distributions, so run the numbers with each option before committing.

Recalculating Each Year

Every January, the calculation starts over. Take the new December 31 balance, look up the new divisor for your current age, and divide.² Both inputs change: the balance shifts with the market, and the divisor shrinks as you age.

In a strong year, the higher balance produces a larger required distribution. In a down year, the lower balance drops the payment. This self-correcting behavior is the RMD method’s main advantage. Withdrawals automatically decrease during a downturn, leaving more capital in place to recover. The fixed methods offer no such protection: miss a few years of growth and the same dollar amount still comes out, which accelerates the drawdown.

The tradeoff is unpredictability. If you rely on SEPP payments for fixed monthly expenses, year-to-year swings can complicate budgeting. Some people in that position prefer a fixed method for certainty, or build a cash buffer outside the SEPP account to smooth the fluctuations.

Which Accounts the Calculation Applies To

SEPP distributions apply to most tax-advantaged retirement accounts, including traditional IRAs, individual retirement annuities, and employer-sponsored plans under Sections 401(a), 403(a), and 403(b).³ Roth IRAs technically qualify, but they rarely make sense for a SEPP because original contributions already come out penalty-free at any time; a Roth SEPP only helps when you need to reach earnings before 59½.

If you’re drawing from an employer plan like a 401(k) or 403(b), you must have separated from service with that employer before payments can begin. IRAs have no such requirement. Each SEPP plan is also tied to a single account. You cannot combine balances from multiple IRAs in one calculation, and you cannot pull extra from one account to cover a shortfall in another.³

How Long the Calculation Has to Continue

Payments must continue until the later of two dates: five full years after the first payment, or the date you turn 59½.³ “Five full years” is literal. A first distribution on March 15, 2026 means the earliest stopping point is March 15, 2031. Someone who starts at 50 is locked in until 59½. Someone who starts at 57 continues until 62.¹

During that period, the calculation has to be respected exactly. Taking more than the calculated amount, taking less, skipping a year, rolling money into the SEPP account, or making additional contributions to it are all treated as modifications that break the plan.³ The consequences are retroactive: the 10% additional tax applies to every distribution since the plan started, plus interest on each of those amounts at the federal underpayment rate.⁵ That rate is the federal short-term rate plus three percentage points, and interest accrues from the original distribution date, so a plan running several years can produce a large recapture bill.

Changes in account value from ordinary investment gains or losses do not count as modifications. The market can cut the account in half and a reduced RMD-method payment is still fine, because the calculation itself produced the lower number. Death or disability of the account holder also ends the plan without recapture, and a final distribution that brings the balance to zero does not trigger recapture even if it falls short of the calculated annual amount.³

Switching to the RMD Method Mid-Plan

If a plan began under the fixed amortization or fixed annuitization method and the payments turn out to be unsustainable, the IRS allows a one-time, irrevocable switch to the RMD method.³ The change is not treated as a modification, so no recapture penalty applies. After the switch, you’re locked into the RMD method for the rest of the plan and cannot switch back or make any further method changes. Once the switch is made, the same annual recalculation described above governs every future payment.

Reporting Each Year on Form 5329

Each year of SEPP distributions is reported on Form 5329, “Additional Taxes on Qualified Plans and Other Tax-Favored Accounts.” Enter exception number 02 on line 2 to tell the IRS the payments are part of a substantially equal periodic payment series and should not be subject to the 10% additional tax.⁶

The IRA custodian or plan administrator will issue a 1099-R for the distribution, typically with code 1 (early distribution, no known exception). The custodian has no way to know a valid SEPP plan is in place, so claiming the exception on Form 5329 is on you. Skipping the form or using the wrong code won’t break the plan, but it will likely generate an IRS notice asking why the penalty wasn’t paid. Clean annual records of the balance used, the divisor applied, and the resulting payment amount make responding to any inquiry straightforward.

1
Office of the Law Revision Counsel. 26 USC 72 – Annuities; Certain Proceeds of Endowment and Life Insurance Contracts
2
Internal Revenue Service. Notice 2022-6 – Determination of Substantially Equal Periodic Payments
3
Internal Revenue Service. Substantially Equal Periodic Payments
4
eCFR. 26 CFR 1.401(a)(9)-5 – Required Minimum Distributions from Defined Contribution Plans
5
Office of the Law Revision Counsel. 26 USC 6621 – Determination of Rate of Interest
6
Internal Revenue Service. Instructions for Form 5329