Opinion letter
IRS letter approving the form of a pre-approved retirement plan document for the current 6-year cycle.
Definition
An IRS opinion letter is the formal IRS approval of a pre-approved Solo 401(k) plan document. The current 6-year Cycle 4 documents have opinion letters dated 2021-2022. Adopting employers should keep the opinion letter date and serial number with their plan records — Solo 5500 Desk records this on the annual passport.
Why it matters
For IRS Form 5500-EZ, this term helps decide which records, dates, values, or review questions belong in the packet.
How the tool uses it
Solo 5500 treats this as a review signal. The user enters the facts, checks the source-linked explanation, reviews the packet, and files through the official channel when the supported case still fits.
When to check the source
Check the official source when the answer depends on eligibility, late filing relief, official correspondence, valuation, or a fact you cannot verify from your own records.
Source and review date
Last reviewed: . Use the linked source for the official wording behind this term.
Official source: IRS Form 5500-EZ filing notices