Withdrawals from a traditional IRA or 401(k) before age 59½ normally trigger a 10% early withdrawal penalty on top of ordinary income tax. Rule 72(t) — the Substantially Equal Periodic Payment (SEPP) exception — is one of the few legal ways to access retirement money early without that penalty, and it is a real option for people retiring in their 40s or 50s who need income before Social Security or a pension kicks in. It is also unforgiving: get the mechanics wrong and the IRS retroactively applies the penalty, plus interest, to every payment you have already taken.
The Three IRS-Approved Calculation Methods
You cannot simply withdraw whatever amount you want. The IRS allows exactly three methods, all built around your account balance, age, and an IRS-published interest rate assumption: the Required Minimum Distribution (RMD) method (recalculated annually, generally the smallest and most variable payment), the Fixed Amortization method (a level payment calculated once, like a mortgage in reverse), and the Fixed Annuitization method (a level payment using an IRS annuity factor). The interest rate assumption for the amortization and annuitization methods is capped at 120% of the federal mid-term rate published monthly by the IRS — roughly 4.5% through 2026.
The Five-Year, Age-59½ Rule
Once you start a 72(t) schedule, you must continue it for the longer of five full years or until you turn 59½. If you start at 50, that means running the schedule for the full 9½ years until 59½, not just five years. The five-year clock is measured from the date of your first distribution, not the calendar year it falls in.
What Breaks the Plan
A “busted” 72(t) plan is expensive. Any of the following disqualifies the entire arrangement retroactively: taking more or less than the calculated amount in any year, adding new contributions to the account, rolling additional money into the account mid-schedule, or stopping early for any reason other than death or disability. When a plan busts, the IRS assesses the 10% penalty on every distribution taken since day one, plus interest, all due in the year the plan busted — not spread across the prior years.
One Exception: The One-Time Switch
The IRS does allow a single, one-time penalty-free switch from the amortization or annuitization method to the RMD method if the fixed payment amount becomes a hardship. You cannot switch back, and you cannot make this change more than once.
Which Account to Use It On
A common technique is to split a large IRA into two IRAs before starting 72(t): a smaller one sized to produce exactly the annual income needed, left running the SEPP schedule, and a larger one left untouched for true emergencies or normal retirement withdrawals after 59½. Because 72(t) applies per-account for IRAs, this avoids locking your entire retirement balance into a rigid, multi-year payment schedule you can’t touch for anything else.
72(t) vs. the Rule of 55
Retiring between 55 and 59½ from the employer whose 401(k) you’re withdrawing from may qualify for the separate “Rule of 55,” which allows penalty-free withdrawals directly from that employer’s plan with none of the multi-year 72(t) commitment. 72(t) matters most for people retiring before 55, for IRA money, or for 401(k) plans from a prior employer that don’t qualify for the Rule of 55.
Get the Math Reviewed Before You Start
Because a single mistake retroactively penalizes years of withdrawals, the practical rule is: have a CPA or the plan administrator run and document the exact calculation before the first distribution, and never deviate from the schedule without professional advice.
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Related reading: 2026 Retirement Contribution Limits, Required Minimum Distributions in 2026, and Backdoor Roth IRA Conversions.
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