@gregorybret wrote:
Can the profits from my rental property be factored in to my other self employed profits to determine how much I can contribute to my SEP IRA?
Probably not because income (profit) from rental activities is considered passive income, not earned income (e.g., earnings from self-employment).
See https://www.irs.gov/publications/p560#en_US_2018_publink10008809
Absent unusual circumstance, such as being a real estate dealer or providing substantial services to your tenants (i.e., where your income would be reported on Schedule C), you cannot use rental profit for your purposes.