It happens to most growing businesses at least once. You started doing the bookkeeping yourself, things got busy, you fell behind, and now you're staring at 18 months of unreconciled bank statements with a VAT return looming and Companies House sending reminders. This guide walks through how to do catch-up bookkeeping properly, what a good catch-up accountant actually delivers, and how to avoid getting here again.
The honest assessment
First, take stock. Open your accounting software (or sign up for one if you don't have it) and answer these:
- How far behind is the bank reconciliation?
- How many bank accounts are involved?
- How many transactions per month do you typically have?
- Do you have receipts for everything?
- Is VAT involved?
- What deadlines are pressing — VAT, payroll, Companies House, tax return?
The answers determine whether this is a weekend job or a four-week project.
The five scenarios we see most
1. New limited company, never set up books
Common in year one. You incorporated, traded, and never set up accounting software. Catch-up here is straightforward: choose software, import bank data, classify everything, produce accounts. Usually 5–10 days of work depending on volume.
2. Started in cloud but fell behind
You set up Xero or QuickBooks, used it for a few months, then stopped reconciling. Often the easiest catch-up — the structure exists, just needs working through.
3. Spreadsheet plus shoebox
Records exist but they're in three formats across multiple tools. The catch-up needs migration plus catch-up plus a workflow rebuild.
4. Migrating away from a previous bookkeeper
The books exist somewhere but you've lost access or the previous bookkeeper left things in a state. This adds a forensic step — sometimes literally restoring a previous version of the books before catching up.
5. Tax investigation triggered the realisation
HMRC has opened an enquiry or sent a "we think you may be underdeclaring" letter. Catch-up here needs to happen alongside investigation defence. Always tell your accountant immediately if this is your situation.
The catch-up workflow
Step 1: capture the bank data
Bank feeds in cloud software typically pull 90 days. Beyond that, you'll need to download CSV statements directly from the bank for the period. Open Banking authorisation pulls live forwards; CSV imports cover historic. AutoEntry and Dext can extract from PDF statements if CSV isn't available.
Step 2: import to the accounting software
Set up each bank account, credit card, PayPal, Stripe, etc. Import the historic data. The software now has every transaction but most are unclassified.
Step 3: build the chart of accounts
Spend an hour designing the chart of accounts properly before classifying transactions. Otherwise you'll classify everything once, realise you need different categories, and reclassify. Build the chart for the next three years, not just the catch-up. See our guide to chart of accounts design.
Step 4: classify in waves
Don't go transaction by transaction. Sort the list by amount or by description and classify whole groups at once. The 80/20 rule applies — 20% of transactions (recurring payments, large items) make up 80% of the total. Get those right first, then sweep up the rest.
Step 5: chase the missing pieces
Some transactions you won't be able to classify without a receipt or context. Build a list and either find the receipts or make a director's judgement (if it's small enough). For VAT-significant items, you need the actual invoice.
Step 6: reconcile to statements
Once everything is classified, reconcile to the actual bank statements. Discrepancies will surface — usually missing transactions, duplicate transactions, or wrong dates.
Step 7: post adjustments
Accruals, prepayments, depreciation, director's loan reconciliation, dividend documentation — all the year-end-style adjustments need to be posted for any closed periods. If multiple years are involved, this happens per period.
Step 8: file what's overdue
VAT returns, corporation tax returns, payroll year-ends, Companies House confirmation statements and accounts — whatever is overdue gets filed. Penalties may apply for late filing but they'll only grow if you delay.
How long it actually takes
- 6 months catch-up, low volume: 3–5 days of focused work.
- 12 months catch-up, medium volume: 1–2 weeks.
- 2 years catch-up with VAT and payroll: 3–4 weeks plus filing time.
- Major catch-up with investigation: 6 weeks plus.
DIY or hire a catch-up accountant?
Honest answer: most directors who try DIY catch-up don't finish. The work is dull, time-consuming, and easy to defer. Outsourcing it gets a deadline, dedicated attention, and someone who's done this hundreds of times. We run catch-up bookkeeping engagements with a fixed scope and fixed fee. Speak to us via our contact page if you're behind.
The hidden value of a good catch-up
A proper catch-up isn't just compliance. Done well it surfaces:
- Missed VAT input claims (often thousands of pounds).
- Capital allowances not previously claimed.
- Director's loan position you didn't know about.
- Costs that should be capitalised, not expensed.
- Revenue that wasn't being recognised correctly.
The savings from corrected positions often exceed the fee.
What to do immediately
- Stop the bleeding. Set up bank feeds today so it doesn't get worse.
- List your deadlines. VAT, payroll, accounts, tax return.
- Pick the software. Xero or QuickBooks for most UK SMEs.
- Get help if the project is more than 5 days.
- Build the habits that prevent recurrence — weekly reconciliation, monthly close.
Penalties and HMRC
Late filing penalties are real but capped. They're rarely the biggest cost — interest on unpaid tax usually is. Filing late is always better than not filing. Once filed, you can usually arrange a Time to Pay agreement if cash is tight. Our tax team negotiates these regularly.
Preventing recurrence
The single best preventive measure is monthly bookkeeping with a fixed cadence — either DIY with a weekly slot in the calendar, or outsourced to a bookkeeper with a service-level commitment. Most clients who come to us for catch-up stay on for ongoing bookkeeping precisely because they don't want to be here again.
Being behind on bookkeeping is common and recoverable. It's not a sign you're a bad business owner — it's a sign you've been busy doing the work that generates the bookkeeping. Get a deadline-driven plan, execute it, and rebuild the habits. Within a month you'll be current and the relief is real.