What is catch-up bookkeeping and do I need it?
Your BAS is overdue. Your accountant keeps asking for last year's figures. You haven't looked at your Xero account since April. Sound familiar?
Written by Holly Salmons · Registered BAS Agent & Bookkeeper, Melbourne
If your books have fallen behind — whether it's a few months or a few years — you're not alone. It happens to small business owners, tradies, sole traders and contractors all the time. Life gets busy, priorities shift, and the bookkeeping quietly piles up in the background.
The good news? It's completely fixable. That's exactly what catch-up bookkeeping is for.
What is Catch-Up Bookkeeping?
Catch-up bookkeeping (also called backlog bookkeeping or bookkeeping rescue) is the process of bringing your accounts up to date from a point in the past to the present day. It involves going back through your transactions, reconciling your bank accounts, sorting your invoices and bills, fixing errors, and getting your books into a clean, accurate state.
It's not a judgment — it's a service. A good bookkeeper will work through your backlog efficiently and without making you feel bad about it. The only goal is getting you back on track.
Signs You Need Catch-Up Bookkeeping
Not sure if your books actually need a clean-up? Here are the most common signs:
Do any of these sound like you?
Your BAS is overdue, incorrect, or you've never lodged one
Your bank accounts haven't been reconciled for months
You have no idea if your business is actually profitable
Invoices haven't been followed up — money sitting uncollected
Your accountant or tax agent is asking for records you can't find
You've recently taken over from a bookkeeper who left a mess
You started your business but never properly set up the books
You have an ATO debt or payment plan you can't fully explain
You're dreading tax time because you know the numbers aren't right
If you ticked even one of those, a catch-up bookkeeping job is probably worth having a conversation about.
What Does Catch-Up Bookkeeping Actually Involve?
Every catch-up job is different depending on how far behind the books are and what software is being used — but here's a general idea of the process I follow for Melbourne clients:
Initial assessment
We start with a free conversation to understand how far back the books go, what software you're on (Xero, MYOB, spreadsheets, or nothing at all), and what the priority issues are — usually overdue BAS or an upcoming tax deadline.
Bank reconciliations
Working through every bank and credit card statement chronologically, matching transactions to invoices and receipts, and categorising everything correctly for GST and tax purposes.
Invoices and bills
Entering any outstanding invoices and bills, chasing up unpaid amounts, and making sure your accounts receivable and payable are accurate.
Payroll and super check
Reviewing payroll records to make sure superannuation has been calculated and paid correctly — super errors are one of the most common (and costly) issues I find in catch-up jobs.
BAS review and correction
As a registered BAS Agent, I can review previous BAS lodgements, identify any errors, and lodge amendments with the ATO where needed. Overdue BAS periods are lodged and any penalties or interest addressed.
Clean books handed back
Once the catch-up is complete, you'll have accurate, up-to-date accounts — ready for your tax agent, ready for your next BAS, and ready to actually show you how your business is performing.
How Long Does Catch-Up Bookkeeping Take?
It depends on how far behind the books are and how complex the business is — but here's a rough guide:
A few months behind — usually a few days of work
6–12 months behind — typically one to two weeks
More than a year behind — two to four weeks depending on complexity
Multiple years or no bookkeeping ever done — assessed individually, but it's always fixable
I always do a proper assessment before quoting so there are no surprises. The priority is always getting the most urgent items — usually overdue BAS — sorted first.
How Much Does Catch-Up Bookkeeping Cost?
The cost varies depending on:
How many months or years need to be caught up
Which software your books are on (or not on)
Whether payroll and super are involved
How much documentation is available (receipts, invoices, bank statements)
Whether BAS amendments need to be lodged with the ATO
I offer a free initial consultation for all catch-up jobs so I can give you an accurate quote before any work begins. No surprises, no hidden costs.
Can I Just Do It Myself?
Technically yes — but there are a few reasons most business owners find it worth bringing in a professional:
It takes much longer than you think. What a bookkeeper can do in a day often takes a business owner a week — because you don't do it every day and there's a steep learning curve with the software.
Errors compound. When you're reconciling large volumes of historical transactions it's easy to make mistakes that flow through to your BAS and tax return.
BAS corrections must be lodged by a registered BAS Agent. If your BAS has errors, only a registered BAS Agent can lodge the amendments with the ATO — you can't do this yourself.
ATO penalties and interest need to be handled correctly. If there are outstanding lodgements or debts, how you approach the ATO matters. A registered BAS Agent knows how to navigate this.
Frequently Asked Questions
How far back can the ATO audit my books?
Generally the ATO can review your records going back five years. For serious matters or fraud, there's no time limit. This is why getting your books in order sooner rather than later matters — the longer you leave it, the harder it is to find documentation for older periods.
What happens if my BAS is overdue?
The ATO applies a Failure to Lodge (FTL) penalty for overdue BAS lodgements. The sooner you lodge, the sooner the penalty stops accumulating.
Can catch-up bookkeeping fix my ATO debt?
Catch-up bookkeeping won't eliminate an ATO debt, but it gives you an accurate picture of exactly what's owed and why — which is the first step to resolving it. In some cases clients find their actual debt is different (sometimes lower) than they thought once the books are cleaned up and properly reconciled. From there, payment arrangements can be put in place and any eligible remissions applied for.
What software do I need for catch-up bookkeeping?
Ideally Xero — it's the best cloud accounting software for small businesses and makes catch-up work significantly faster and more accurate. If you're not on Xero yet, a catch-up job is actually a great time to migrate across, so you come out the other end on a solid platform going forward. I can set this up as part of the clean-up process.
Do I need catch-up bookkeeping if I'm a sole trader or tradie?
Yes — sole traders and tradies have the same BAS, super and tax obligations as any other business. In fact, tradies are among the most common clients I see for catch-up jobs, simply because they're busy on the tools and bookkeeping naturally falls down the priority list. There's no judgment here — it's a very easy fix once we get started.
How do I get started?
The easiest first step is a free 20-minute call. I'll ask a few questions about where things are at, give you an honest assessment of what's involved, and quote you from there. No obligation, no pressure.
Behind on your books? Let's get you sorted.
I'm Holly Salmons — a registered BAS Agent and Melbourne bookkeeper. I help small businesses, tradies, sole traders and contractors get their books back on track quickly, accurately and without judgment. Whether you're a few months behind or a few years, it's fixable — and probably less painful than you think.