I am nowhere near retirement, and have not implemented any of these strategies, but have researched and thought about SEPP and Roth conversions alot. Something that has interested me is the potential to maximize the utilization of SEPP for early retires.
SEPP's advantage to the Roth Conversion Ladder is being able to access some funds immediately from an IRA account.
SEPP's disadvantage is not being able to fully utilize the funds designated to SEPP before age 59.5 because the withdrawal rate is so conservative.
But I believe there is a method to more completely utilize money designated to SEPP. This is not necessarily useful for everyone, but is another tool that gives flexibility during ER.
You can do Roth conversions of money in a SEPP account. Your SEPP IRA, and newly created Roth SEPP IRA are together under the same SEPP rules. Your yearly withdrawal can be from either account (or split between both) as long as the total withdrawn is still correct. Also realize Roth's withdrawal order does not care what account your withdraw from. So you could do conversions from your SEPP IRA to your SEPP Roth IRA, then (5 years later) do withdrawals from a standard Roth IRA account. In a sense, you could access Roth gains accrued in a standard Roth IRA account, by using the conversions done between your SEPP accounts.
A potential strategy here is...
Traditional IRA - Rollover 401k into this account.
Roth IRA - Contribute to this account if you are above the traditional IRA limits. Gains will be accessible without tax because of Roth conversions between SEPP accounts.
SEPP IRA - Move over some amount from your Traditional IRA (
https://www.bankrate.com/calculators/retirement/72-t-distribution-calculator.aspx)
Roth SEPP IRA - Do conversions from SEPP IRA into this account. This money can be used after 59.5.