In a large firm, separate preparers and reviewers are built into the structure. In a practice of three or four people, everyone does a bit of everything, and review can quietly become someone glancing at their own work again. Independent review is still achievable at small scale. It needs clear assignments, evidence, and a record.
Assign the reviewer at the start
Decide who will review each engagement when it opens, not when it is finished. That avoids the end-of-season scramble and makes it obvious when someone is about to review work they helped prepare.
The rule is simple. Anyone who contributed to the work does not approve it. That includes partners and owners.
Review against evidence, not memory
A reviewer should be able to see where each significant number came from. That means workpapers that link values to the specific source document and page, and documents that were accepted explicitly rather than pulled from an inbox. If the reviewer has to ask “where did this come from?”, the preparation is not ready for review.
A practical review checklist covers:
- Changes from the prior year and whether they are explained.
- Every source document accounted for, or noted as missing.
- Significant judgments documented.
- Consistency between intake answers and the return.
- Any readiness issues resolved before submission.
Review a snapshot
Work changes. If the preparer keeps editing while the reviewer is reviewing, nobody knows what was actually approved. Submit a snapshot of the workpaper and its evidence for review, and record the reviewer’s decision, either approved or returned with notes, against that snapshot. If changes are needed, a new snapshot goes through review again.
Separate internal notes from client communication
Review notes are internal. Client summaries are not. Keep them in separate places and require an explicit release step before anything reaches the client. That prevents an internal comment from ending up in a client’s inbox.
When the practice is very small
A solo practitioner cannot have an independent reviewer inside the firm. Some solo preparers arrange peer review with a trusted colleague for complex returns, under appropriate confidentiality arrangements and consent where required. At minimum, a cooling-off period and a structured self-review checklist reduce errors.
Let software enforce the rules
Policies drift during busy weeks, and software can hold the line. Zacello assigns reviewers per engagement, blocks anyone who contributed from approving, preserves the snapshot that was reviewed, and keeps internal review comments out of the client portal entirely.
Written by the Syntonyl team. This article is general information, not legal, tax, or financial advice.