Section 403(b) plans must be maintained pursuant to a written
plan document that meets detailed requirements set forth in IRS
regulations. If a plan contains a defect as to form (e.g., a
provision does not comply with the regulations or a required
provision is missing), the plan can be at risk for losing its
qualification for favorable tax treatment. The IRS allows a
"remedial amendment period" to correct form defects in
individually designed plans that were timely adopted, but the
remedial amendment period ends March 31,
2020 (subject to a short extension for recently
incurred plan defects).
It is not uncommon for the IRS to identify possible defects in
well-drafted plan documents that were adopted in good faith. The
"remedial amendment period" offers employers an
opportunity to review existing language in light of developments
over the last several years and to clean up or improve the language
retroactively without penalty.