What does a CPA firm review before releasing a monthly CAS package?
That every schedule ties to the trial balance, clearing and suspense accounts are empty or listed, recurring items are present and consistent with prior periods, figures agree with the sources they cite, and anything unresolved sits on an exception list. Review and sign-off stay with the firm’s licensed staff.
Production scales by adding people. Review does not. The judgment and the sign-off stay with the firm’s licensed staff, which makes reviewer time the one resource a CAS practice cannot buy more of — and it follows that anything shortening a review is worth more than anything shortening preparation.
That is an uncomfortable conclusion, because almost all effort in outsourced production goes into preparation speed. This covers the other side: what the firm actually checks before a monthly package goes out, and what a prepared file can do to make that check short. It sits under CAS production support.
The five things most review standards come down to
- Every schedule ties to the trial balance.
- Clearing and suspense accounts are empty, or their balances are listed with an age.
- Recurring items are present and consistent with prior periods.
- Reported figures agree with the source records they claim to come from.
- Anything unresolved is on an exception list rather than absorbed into a balance.
The specific list belongs to the firm, and the important part is that it is written down. An unwritten review standard is applied differently by each reviewer and differently by the same reviewer in a busy week, which makes it impossible for preparation to build to it.
Review degrades into re-performance, and that is the real cost
A review checks that work was done and that the result is supportable. Re-performance redoes it. The slide from one to the other happens for specific, fixable reasons: a figure cannot be traced to its source, it is unclear whether an item was considered or simply missed, or the same correction appears for the third month running.
When a firm says outsourcing took longer than doing the work itself, this is almost always what happened. The preparation was not wrong — it was unverifiable, which costs more.
Build the file for a reviewer who samples
A reviewer under time pressure samples; they do not re-perform. So the file should put the tie-outs, the exception list and the period-on-period movements where they are seen first, and answer the two questions a reviewer always has — does this tie, and what is unresolved — before the file is fully opened.
This is the same discipline as tax workpaper preparation, applied to a monthly package rather than a return.
Separate a correction from a question from a preference
Review findings are three different things and they need different handling. A correction can be acted on immediately. A question needs an answer before anything is changed. A preference should be recorded in the workflow documentation so it becomes the standard rather than being re-issued every month.
Findings that arrive without that distinction cost a cycle while the preparer works out which is which, and they are the usual reason a correction is applied to one client’s file and not the other four it also applied to.
A repeat finding is a documentation failure
A correction made in three consecutive periods is not a preparation mistake. It is a convention that was never written down. Fixing the instance and leaving the cause means paying for the same correction every cycle — which is why repeat findings are the most informative thing a firm can measure about an engagement.
Alongside them: first-pass acceptance and reviewer minutes per close. A stable acceptance rate with rising repeat findings is the signal that corrections are reaching files but not the process.
A shorter review is not a weaker one
It depends entirely on where the time came from. Shortening review by performing fewer checks lowers assurance. Shortening it by making tie-outs traceable and exceptions visible raises assurance, because the reviewer spends the same attention on judgment instead of on navigation.
Sign-off, interpretation for the client and release stay with the firm’s licensed staff in every case. For how these standards get established at the start of an engagement, see CAS client onboarding, and for protecting review capacity across a book, the close calendar.