The pattern is always the same. Bookkeeping slipped during a busy quarter. A deadline got met with estimates. Now it's eleven months later, the backlog is too unpleasant to open, and every month adds to it.
From the inside, this is one of the most predictable projects in accounting. The past has a fixed size; it stopped growing the moment you drew the line.
What it costs and how long it takes
The honest drivers are transaction volume, number of accounts and entities, payroll complexity, and how much source documentation survives. Rough shapes for a 20-to-100-person business:
| Backlog | Typical effort | Elapsed time |
|---|---|---|
| 3 months | Small project | About a week once documents are in |
| 12 months | Medium project | Two to three weeks |
| 2+ years, multiple entities | Scoped individually | Four to eight weeks |
The number that matters more than any of those: a proper provider quotes the whole project as one fixed price after seeing the file. Hourly catch-up billing carries no incentive to finish, and open-ended engagements are where costs escalate.
The five stages
- Find the last clean month. The most recent month where every account reconciled to its statement. That's the starting line, and it defines the entire scope. Everything after it is in; everything before it is history.
- Collect documents once. A single request, not a weekly drip: bank and card statements for every account across the full period, loan statements, payroll reports, payment-platform exports (Stripe, Shopify, PayPal), the ATO/IRD/IRS/CRA portal access or copies of everything filed during the gap, and any invoices or bills living in inboxes. Document drip-feed stalls more catch-up projects than any accounting difficulty.
- Rebuild month by month. Code, reconcile, lock, move forward. Bulk-coding a year in one pass is faster and produces the same mess with tidier formatting — the month-by-month discipline is what makes the result trustworthy.
- Compare filed returns to rebuilt reality. Returns lodged from estimates during the gap get checked against the true figures. Small differences get noted; material ones get amended properly. All four countries we work in have voluntary-disclosure paths that treat you better when you raise the error than when an audit finds it.
- Hand into a monthly rhythm. A catch-up that ends without a standing close schedule starts rebuilding itself the following month. The project isn't finished at "caught up"; it's finished at "caught up and closing monthly".
What the backlog costs while it waits
Beyond the fix itself: decisions made on estimated numbers, GST or sales tax calculated on wrong bases, lender conversations that stall when statements can't be produced, and late-lodgement penalties that were avoidable. One client arrived with 14 months of backlog and a bank facility renewal six weeks away; the facility went through, but the premium weeks of work to hit that date cost more than a year of ordinary bookkeeping would have.
Red flags in catch-up quotes
- Hourly billing with no cap and no scope document.
- No request to see the file before quoting — nobody can price what they haven't looked at.
- A promise to "just get it done in Excel" outside your accounting system, which leaves you nothing reusable.
- No mention of comparing historical filings against the rebuilt numbers.
- No plan for what happens after the catch-up ends.
The only expensive decision is waiting. The backlog is at its smallest today, and we take on books in this state every month — it's the single most common way an engagement starts.