Hi & thanks for using our service. I'll do my best to give you a complete & accurate answer. Please ask me to clarify anything you don't understand.
A SEP is an IRA; but don't know the answer to your question without checking; there are also age issues re maximum contributions;
A SEP-IRA cannot be a Roth IRA. Employer contributions to a SEP-IRA will not affect the amount an individual can contribute to a Roth or traditional IRA.Unlike regular contributions to a traditional IRA, contributions under a SEP can be made to participants over age 701/2. If you are self-employed, you can also make contributions under the SEP for yourself even if you are over 701/2
Participants age 70 1/2 or over, must take required Minimum Distributions.
The above 3 paragraphs taken from IRS Publication 560, page 6, toward the bottom of the middle column.
Employer contributions to a SEP-IRA will not affect the amount an individual can contribute to a Roth or traditional IRA.
Chris, you locked me out by asking for "npadvisor" ; I had already answered & reanswered in the last sentence above.
Sorry, was looking, back to you Steve -