SEPP / 72(t) Calculator: How to Use It

What this calculator does

The SEPP Calculator computes your annual and monthly payment under all three IRS-approved methods using your account balance, age, and the current applicable federal rate. It shows the payment each method produces so you can compare them and choose based on how much income you need and how much flexibility you want.

The calculator also shows the total amount you'd withdraw over the SEPP period under each method, and what your estimated account balance looks like at the end of the required period, assuming a specified rate of return.

What each input means

Account balance

The balance of the specific IRA or retirement account you're running SEPP from. Use the balance on the date you plan to start the plan, or the most recent statement balance. If you're planning to segregate a portion of your IRA into a new account for SEPP purposes, use the amount you intend to put in that account.

IRS guidance allows you to use any reasonable valuation within a short period before the first payment. Most practitioners use the prior month-end statement balance.

Your age at first distribution

Your age when you take the first SEPP payment. This affects the life expectancy factor used in all three methods. A younger starting age produces smaller payments (longer life expectancy) and a longer required continuation period. If you start at 50, you must continue SEPP until 59.5, which is 9.5 years.

Interest rate

You can use up to 120% of the mid-term applicable federal rate from the month of first distribution or either of the two preceding months. The IRS publishes monthly AFR tables at irs.gov. The calculator uses the current month's rate by default but lets you enter a specific rate. For the RMD method, the interest rate doesn't apply.

The three methods compared

Required Minimum Distribution method

Divides your account balance by your life expectancy factor from the IRS tables each year. Payments change annually as the balance and factor change. This produces the smallest and most variable payments. It's the most conservative choice but also the most flexible if your needs change, since the payment adjusts with market performance. You can't stop early, but the amount will naturally fluctuate.

Fixed Amortization method

Calculates a fixed annual payment based on your initial balance, chosen interest rate, and life expectancy. The payment never changes regardless of account performance. If you need predictable income, this is generally the better choice. Most practitioners who use SEPP default to this method. It typically produces larger payments than the RMD method.

Fixed Annuitization method

Uses an annuity factor from IRS guidance to produce a fixed payment. Very similar to amortization in practice. The annuity factor approach was the original IRS method before the guidance was updated. Payments are also fixed. The two fixed methods typically produce results within a few percent of each other.

The modification rule and why it matters

If you modify the SEPP plan before completing the required period, the 10% penalty is charged retroactively on every prior distribution, plus interest. "Modification" includes: stopping distributions, changing the amount (except a one-time switch from fixed amortization to RMD method, which the IRS allows), adding money to the SEPP account, or taking any additional withdrawal from the SEPP account. Keep a dedicated SEPP account separate from accounts you might need to touch.