When calculating your Series of Substantially Equal Periodic Payments (SOSEPP), provided for under §72(t)(2)(A)(iv) of the Internal Revenue Code, one of your choices is the Fixed Amortization method.
Calculating your annual payment under this method requires you to have the balance of your IRA account. With this balance you then create an amortization schedule over a specified number of years equal to your life expectancy factor from either the Single Life Expectancy table or the Joint Life and Last Survivor Expectancy table, using the age(s) you have reached (or will reach) for that calendar year. The amortization table must use a rate of interest of your choice, but the chosen rate cannot be more than 120% of the federal mid-term rate published by regularly the IRS in an Internal Revenue Bulletin (IRB).
Which table you use is based upon your circumstances. If you are single, or married and your spouse is less than 10 years younger than you, you will use the Single Life Expectancy table. If you are married and your spouse is 10 years or more younger, you may choose to use the Joint Life and Last Survivor Expectancy table.
Once you’ve calculated your annual payment under the Fixed Amortization method, your future payments will be exactly the same until the SOSEPP is no longer in effect. There is a one-time opportunity to change to the Required Minimum Distribution method.
For more details on the Series of Substantially Equal Periodic Payments (SOSEPP) see Early Withdrawal of an IRA or 401(k) – SOSEPP.