A retirement plan needs regular attention and care to keep it operating well. Use the information and resources below to avoid mistakes in your retirement plan. Retirement plan operation and maintenance Responsibilities and duties in keeping your retirement plan in compliance. Fix-It Guides Tips on avoiding errors in 401(k), SEP, SIMPLE IRA and SARSEP plans. Checklists A quick review to help you avoid some common mistakes in operating your 401(k), 403(b), SEP, SIMPLE IRA and SARSEP plans. Fixing common plan mistakesCommon mistakes that happen in retirement plans and how to correct the problem. Avoiding compensation errors in retirement plans Areas affected by your plan's definition of compensation and tips for getting it right. A guide to common qualified plan requirements A list of some important retirement plan requirements to help you implement practices, procedures and internal controls to monitor plan operations. Found a mistake or problem in a retirement plan? Learn how to fix plan errors.