The IRS has issued a checklist for SEPs. Here is what it says about the checklist.
Every year it is important that you review the requirements for operating your Simplified Employee Pension (“SEP”) plan. Use this checklist to help you keep your plan in compliance with many of the important rules. See www.irs.gov/retirement for online versions of this checklist, Fix-It Guides, and other resources for SEPs and other plan types. On the online version of this checklist, click on “(More)” in any of the questions for additional information (including examples) on how to find, fix and avoid each mistake.
The checklist is here.