What does cleanup before a first CAS close involve?
Diagnosing the backlog on a sample, agreeing a cutoff date and scope with the CPA firm, remediating to that cutoff, and substantiating every balance-sheet opening balance against evidence outside the ledger. It is scoped separately from monthly work because its size is unknown until part of it has been examined.
A recurring close built on an unexamined ledger never settles. The first period inherits whatever was wrong, every period after it carries the same inheritance, and the close keeps running long because it is quietly doing remediation work nobody scoped.
That is why cleanup is its own engagement rather than the first month of a monthly one. It sits before onboarding and the first close in CAS production support, and it is scoped separately for a reason that is structural rather than commercial.
Two jobs with different endpoints
Monthly work is recurring and roughly predictable. Cleanup is remediation of an unknown quantity of past error, and the quantity cannot be established until some of it has been examined.
Combine them and one funds the other. In practice the recurring work absorbs the overrun, which means the close is late every period and nobody can say why — the hours are going somewhere real but somewhere nobody is measuring.
Diagnose on a sample, not an estimate
The size of a cleanup is far better established by examining a little of it than by assessing all of it from outside. A limited diagnostic — reconciling one or two periods, checking whether balance-sheet accounts are substantiated at all, counting unsupported transactions — produces a scope grounded in evidence.
What that diagnostic is for is giving the CPA firm the basis to decide what is worth doing. It is not a quote dressed as an investigation.
The cutoff is what gives cleanup an end
A cutoff is the date before which the records are accepted as they are, and after which they are rebuilt. Without one, cleanup expands backwards indefinitely, because there is always an earlier period containing something wrong.
Where it should fall depends on what the client needs the records to support and on the firm’s view of periods already filed. Both of those are the firm’s to weigh.
Substantiating an opening balance
An opening balance is substantiated when it traces to evidence outside the ledger — not when it agrees with the prior period, which only proves it was carried forward.
- Cash to a reconciled statement
- Receivables to an aging that agrees to invoices
- Payables to an aging that agrees to vendor records
- Debt to a lender statement
- Fixed assets to a schedule with additions and disposals
- Payroll liabilities to the payroll records
Work the balance sheet before the income statement, and inside it start with the accounts that have third-party evidence available: those are simultaneously the cheapest to verify and the most load-bearing. Equity and retained earnings resolve last, because they absorb whatever everything else has failed to explain.
Not every error should be corrected
Trying to is the most reliable way to make a cleanup uneconomic. Some errors are immaterial, some cost more to resolve than the resulting information is worth, and some sit in periods already filed where correcting them has consequences well outside the ledger.
Which are corrected, which are disclosed and which are left alone is a professional judgment for the CPA firm. Preparation quantifies them so that judgment is made on amounts rather than impressions — and anything touching a filed period goes to the firm with the periods and amounts named. Preparation work does not amend a filing or decide whether one should be amended.
Record what you deliberately left
Document what was changed and why, what was examined and found acceptable, and what was knowingly left alone with the reason.
That third category is the one usually skipped and the most useful afterwards. A reviewer or a later preparer who can see that an account was looked at and consciously not touched does not spend a cycle rediscovering it — the same logic as documenting a close.
What finished means
Not that every historical figure is now right. Finished means every balance-sheet account at the cutoff traces to evidence, the remaining open items are named and quantified rather than unknown, and the conventions the recurring work needs have been decided and written down.
At that point the first real close has a supported position to start from, and what is still unresolved is visible to everyone who relies on it.