The catch-up bookkeeping process: a 6-week playbook.
Catch-up bookkeeping is the structured rebuild of an accounting record that has fallen months or years behind. Our catch-up bookkeeping process runs six weeks: diagnostic and triage, foundation rebuild, transaction reconciliation, back tax filings, then senior review and handover to a normal monthly close.
What does the catch-up bookkeeping process look like?
Catch-up bookkeeping is the kind of work where freestyle execution costs you 3x what disciplined execution does. Without a sequence, you skip back and forth between years, leave open items unresolved, miss VAT periods, and end up running parallel reconciliations multiple times. With a documented playbook (same steps every time, in the same order), a 12-month backlog routinely completes in six weeks.
The playbook below is ours, refined across ~80 catch-up engagements in the last 24 months. Skip nothing; do the steps in order.
Week 1: Diagnostic and triage
Day 1–2: software state
- Audit the existing accounting software: what's set up, what's broken, what's missing.
- Confirm bank feeds are working. If broken, prioritise reconnection, the feed needs to be live for everything that follows.
- Pull bank statements directly from the bank for the full catch-up period as a safety net.
- Identify chart-of-accounts issues (duplicates, miscoded, missing categories). Don't fix yet, log them.
Day 3–5: data inventory
- List every revenue stream: what tools, what platforms, what bank deposits.
- List every expense category: payroll, suppliers, software subscriptions, recurring direct debits.
- Identify all tax registrations active in the period: VAT, PAYE, Corporation Tax due dates.
- Map missing source documents, what receipts, invoices and statements are needed.
End of week 1 deliverable: a written diagnostic with scope confirmation, source-document gap list, and a six-week execution plan. If a sub-team is assigned, this becomes their brief.
Week 2: Foundation rebuild
Chart of accounts and opening balances
- Set the chart of accounts as it should be, not as it is. Add missing categories, mark duplicates for merging, separate restricted from unrestricted accounts.
- Establish opening balances. The right anchor is the last clean financial-year close, either the prior year's filed accounts (if available and trusted) or a reconciled point-in-time balance sheet you can defend.
- Where opening balances themselves are questionable, you may need to extend the catch-up further back. This is a judgement call, discuss with the client and adjust scope.
Bank-feed historical import
- Import historical bank data for the full catch-up period. Xero supports 12 months of historical bank-feed import; for periods longer, use bank-statement CSV upload.
- Resolve any duplicates between bank-feed transactions and manually-entered transactions.
Weeks 3–4: Transaction reconciliation
This is the bulk of the work. Process the catch-up period chronologically, month by month.
For each month
- Bank transactions: match, code, reconcile to bank statement.
- Card transactions: same.
- Payment-gateway transactions (Stripe, PayPal, GoCardless): reconcile gross to bank net of fees.
- E-commerce platforms: import settlement statements via A2X or equivalent, split into clean components.
- Receipts and invoices: capture via Dext or AutoEntry, match to bank lines.
- Manual journals: depreciation, accruals, prepayments, payroll journals.
Discipline matters. Don't skip months. Don't reconcile January with parts of June. Do month-by-month, finish each before starting the next.
Chase missing documents weekly
Throughout weeks 3 and 4, you'll surface missing receipts and unverified transactions. Don't let them accumulate. Send a weekly chase to the client with specific transaction-level requests: "Bank line £487 on 4 March, no supporting invoice, please send."
Week 5: Tax-period work
By now the ledger is reconciled. Now address the tax filings that were missed during the backlog period.
VAT
- Identify all VAT periods that fell during the catch-up window.
- Prepare a VAT return for each, from the now-clean ledger.
- Where penalties or interest are payable on late filings, prepare reasonable-excuse correspondence if the facts support it.
- Submit via the HMRC Agent gateway with full audit trail, under the Making Tax Digital for VAT rules.
Payroll RTI
If payroll filings have been missed (rarer: payroll software usually keeps clients current even when bookkeeping lags), prepare back-dated FPS and EPS submissions.
Corporation Tax
If the catch-up spans a financial year-end, prepare the CT600 from the reconciled trial balance. File at HMRC.
Week 6: Final review and handoff
Senior review
A second qualified accountant reviews the cleaned ledger end-to-end. Anomalies are surfaced. The reviewing accountant verifies bank reconciliations balance, opening balances tie to prior period, and tax filings are submitted with confirmation.
Client walkthrough
Schedule a 60-minute call. Walk the client through:
- State of the cleaned ledger, what's now visible that wasn't before.
- Material adjustments made during catch-up: opening balance corrections, accruals, prepayments.
- Tax filings completed, copies of submitted returns, payment positions.
- Any matters requiring client attention: historic disputes, missing documents that couldn't be recovered, items that need legal or audit follow-up.
Handover document
Written deliverable summarising everything done during the engagement. This is the audit trail. Archive a copy to the client's cloud drive.
Transition: cleaned ledger to monthly cadence
Catch-up engagements that end in handover often relapse. The same factors that caused the backlog (founder bandwidth, no internal team, software not configured) reassert themselves within months. The right ending is transition to a monthly retainer (Starter, Growth or Professional tier), starting the day the catch-up completes. The cleaned books then stay clean.
The catch-up itself is the easy part. The hard part is ensuring you never need another one. That's a monthly cadence question.
How is catch-up bookkeeping priced?
The straightforward pricing model is per month of books cleared. We charge a flat $200 per month, quoted upfront, no hourly variance. A 12-month catch-up: $2,400. A 24-month catch-up: $4,800. The fixed-fee approach makes the engagement predictable for the client and avoids hourly billing on what is fundamentally a definable scope.
The bottom line
Catch-up bookkeeping is a structured discipline, not a frantic cleanup. Diagnostic in week 1. Foundation in week 2. Transactions in weeks 3–4. Tax filings in week 5. Senior review and handover in week 6. Twelve months of disorder turned into a clean ledger in six weeks. We've done it dozens of times. The playbook works.
What does being twelve months behind actually cost?
More than the clean-up fee, and the penalties are the part clients have not usually added up. The figures below are the UK ones we quote most often. They are fixed amounts set by statute, not estimates.
| Filing | How late | Penalty |
|---|---|---|
| Company accounts at Companies House | Up to 1 month | £150 |
| Company accounts at Companies House | 1 to 3 months | £375 |
| Company accounts at Companies House | 3 to 6 months | £750 |
| Company accounts at Companies House | More than 6 months | £1,500, and doubled if late two years running |
| Self Assessment return | 1 day | £100, even if no tax is due |
| Self Assessment return | 3 months | £10 a day, up to £900 |
| Self Assessment return | 6 and 12 months | A further 5% of the tax due or £300, whichever is greater, at each point |
| VAT return | Each late submission | A penalty point, then £200 at the threshold and on every late return after it |
A limited company nine months behind on accounts, two VAT quarters late and carrying a director's overdue Self Assessment is looking at four figures of pure penalty before any tax, interest or professional fee. The detail sits with Companies House, HMRC's Self Assessment penalties and the VAT late submission points regime.
The second cost is quieter and usually larger. A business without reliable numbers makes pricing, hiring and stock decisions on instinct for a year. We have never seen that go well, and it does not appear on any penalty notice.
What we need from you before week one
Six things, and the speed of the whole project depends on how fast they arrive. This is the list we send on day one.
- Bank and credit card statements covering the full backlog period, as CSV or OFX where possible rather than PDF.
- Adviser-level access to the accounting software, plus confirmation of what has already been filed and when.
- Payroll records for the period, including any RTI submissions already made.
- Sales data from every channel: the accounting software, the payment processors and the marketplaces separately.
- Purchase invoices and receipts in whatever state they exist, including the shoebox.
- Copies of the last set of filed accounts and the last filed return, which give us the opening balances to reconcile to.
The single biggest predictor of a six week project running to ten is item one. A client who can produce machine-readable statements on day one saves roughly a week of rekeying; a client sending scanned PDFs of paper statements adds it back.
How to stop it happening again
Move from an annual habit to a weekly one, and make the weekly one small enough to survive a busy month. Ten minutes on a Friday clearing the bank feed prevents almost every backlog we are ever asked to fix, because backlogs are not caused by complexity, they are caused by a gap that got embarrassing.
We run the clean-up through our catch-up bookkeeping service and then hand straight into cloud bookkeeping services on a monthly cadence, with the filings picked up by VAT and tax compliance and UK Self-Assessment tax return filing. Most rebuilds land in Xero, with QuickBooks for US clients and FreeAgent for sole traders. Back VAT returns are covered in our Making Tax Digital for VAT guide, and once the ledger is current the forecasting layer in our 13 week cash flow template becomes usable for the first time. Sector context sits on small business accountants and online brand accountants.
Behind on your books?
We run this exact playbook for catch-up engagements. Quoted upfront at $200 per month of books cleared. Then we transition you to a monthly retainer so it never happens again.
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