I'm 62, wife is 58, looking forward to 70-1/2, we will have about $50k of RMDs.
This is in addition to SS and other income, probably two times what we spend.
I want to start Roth Conversions, but have a few questions.
We are self employed earning about $75k, add to that dividends and interest that I hope to get reduced to about $20k for 2018. (selling dividend producers)
We max out SEP/IRAs, about $14k, does it make any sense to Contribute to a SEP/IRA and do a Roth Conversion? Seems counter to each other, but I like the SEP/IRA tax deduction.

I guess you need to contact a retirement plan admin for more professional help ;however, one of the primary benefits of using a Roth IRA is that you don?t pay income tax when you withdraw funds in retirement. Unfortunately not everyone meets IRS standards to contribute to a Roth IRA. The primary reason individuals are not allowed to contribute is because their incomes exceed the Roth IRA income limits. That?s when it makes sense to look into a Roth IRA conversion; as you can see, in the past to be able to convert from a retirement plan,i.e., IRA/ sep IRA or etc to a Roth IRA your income needed to be under $100K. The IRS rules have changed and there is no longer an income cap in place.With the cap removed, high-income earners can now freely convert as long as they pay the appropriate tax on the conversion. There is no 10% early withdrawal penalty if the funds move from a Traditional IRA to a Roth IRA in a 60-day window.in my opinion, as a self employer with high income in your case, converting your SEP IRAs to a Roth IRA can be a good way for you to fund a Roth IRA. Your income may be too high for Roth IRA contributions, but as said there are no income limits for converting. When you convert all or part of your SEP IRA to a Roth IRA, the amounts converted will be included in your taxable income for the year.Converting will have no impact on your ability to make a SEP contribution in the year you convert or in any future year, if you are otherwise eligible. You might consider continuing to make a SEP contribution each year and subsequently converting those funds to a Roth IRA. Keep in mind that you should leave enough funds in the SEP IRA to keep the account open to receive your future contributions.