The short answer: a late BAS triggers a Failure to Lodge penalty plus the General Interest Charge accruing daily, and neither can be reduced until the overdue BAS is actually lodged. Catch-up bookkeeping is the process of reconstructing however many months or years of transactions are missing, from bank statements, PayPal and Stripe records and your own explanations for unclear spending, so a lodgement can go in and, where genuine grounds exist, a formal penalty remission request can follow.
Key takeaways
- A late BAS for the 2026-27 year can attract up to $1,820 in Failure to Lodge penalties for an eligible small business, plus daily interest on any amount owing.
- The ATO will not consider a penalty remission request until the overdue BAS is actually lodged, lodging first is not optional.
- Catch-up bookkeeping typically needs full bank statements, PayPal and Stripe access, and your reasoning behind any transaction we can't categorise from the bank feed alone.
- As a Registered BAS Agent, we're required to complete a formal identity check before we can start work for a new client.
What Happens When a BAS Is Lodged Late
The moment a BAS due date passes without lodgement, two separate things start happening, regardless of whether the amount owing has actually been paid. First, the ATO's Failure to Lodge system can apply a penalty automatically, calculated in fixed increments for every 28-day period the lodgement remains outstanding. Second, if there's a net amount owing once the BAS is eventually lodged, the General Interest Charge accrues daily on that amount from the original due date, not from whenever the BAS finally gets lodged. The longer a BAS sits unlodged, the more both of these compound, and unlike some penalties, the ATO doesn't wait for you to notice, both can already be sitting on your account before you've had a chance to catch up.
Failure to Lodge Penalties and the General Interest Charge
For the 2026-27 financial year, an eligible small business can be charged $364 for every 28 days, or part thereof, that a BAS remains overdue, up to a maximum of five penalty units, $1,820, per late lodgement. That's before the General Interest Charge is added on top of any amount actually owing, which compounds daily and is generally not tax deductible.
| Time overdue | Failure to Lodge penalty (small business, 2026-27) |
|---|---|
| 1 to 28 days | $364 |
| 29 to 56 days | $728 |
| 57 to 84 days | $1,092 |
| 85 to 112 days | $1,456 |
| 113+ days (capped) | $1,820 maximum |
Where multiple BAS periods have been missed, these penalties apply per lodgement, not as a single combined figure, which is exactly why the total owing can look alarming once several quarters have stacked up. It's also why acting sooner rather than later matters, every additional 28-day block adds to what's ultimately at stake.
Can You Appeal? Requesting a Penalty Remission
There's no formal appeal available while a BAS remains unlodged, the ATO will not consider a penalty remission application until the outstanding BAS has actually been lodged. Lodging first is not a formality, it's a hard prerequisite. Once it's lodged, a registered BAS agent can submit a formal remission request on your behalf, generally citing grounds set out in the ATO's own practice statements. Since January 2026, remission requests need to be a proper written application supported by evidence, not just a phone call.
What actually supports a successful remission request: a genuinely clean compliance history, if this is the first time a BAS has been late after years of lodging on time, that's the strongest single argument available. Beyond that, circumstances truly outside your control carry real weight, serious illness, a natural disaster, a family crisis, or something comparable, particularly with some supporting detail attached rather than a bare assertion. What generally doesn't succeed is simply being busy or having lost track of the paperwork, which is precisely the gap catch-up bookkeeping exists to close before it becomes a repeated pattern.
Behind on BAS and not sure where you actually stand? Book a free call and we'll look at your file and talk through what a remission request would realistically need.
What Catch-Up Bookkeeping Actually Involves
Catch-up bookkeeping, sometimes called rescue bookkeeping, is the process of reconstructing however many months of missing transactions are needed to bring a business's books current enough to actually lodge. It's not simply re-entering everything from a bank feed, most of that can be pulled in automatically, the real work is correctly categorising every transaction, identifying GST treatment, reconciling accounts that haven't been touched in a while, and resolving anything that doesn't have an obvious explanation sitting in the data alone. For a business with straightforward, mostly bank-fed income and expenses, catching up a few months can move quickly. For a business running multiple payment platforms, ambiguous transfers, or personal and business expenses mixed together, it takes real, careful reconstruction work.
The Documents We Typically Need From You
Catch-up bookkeeping moves faster and more accurately the more of these we have upfront, rather than chasing them one at a time as questions come up mid-reconciliation.
| What we typically ask for | Why it's needed |
|---|---|
| Full bank statements for the catch-up period | The source record for every transaction, especially for periods before a bank feed was connected |
| PayPal access | PayPal transactions often net off fees and transfers in ways a bank feed alone can't show clearly |
| Stripe access | Same reason, payment processor fees, refunds and payout timing need the platform's own records to reconcile correctly |
| Rostering and timesheet platform access, Shiftcare, Deputy or similar | If payroll has also fallen behind, we need the actual worked hours and shift data these platforms hold, a bank feed only shows the pay run total, not what it was built from |
| Your reasoning behind unclear expenses | A transaction description rarely tells us whether something is a legitimate business expense, a personal purchase, or a loan repayment, only you know that context |
If payroll is part of the catch-up, not just BAS, read access to whatever rostering or timesheet system is in use, Shiftcare and Deputy are the two we see most often locally, along with platforms like Employment Hero and Tanda, matters just as much as bank statements. Bank data shows what was paid, it doesn't show what was actually rostered and worked, and reconstructing correct award pay, super and STP figures without that underlying shift data usually means re-deriving numbers that already exist somewhere, just not in the bank feed.
The client reasoning point above is usually the one that actually determines how quickly a catch-up moves. We can reconcile clean, obvious transactions without much back and forth, but a round of genuinely ambiguous ones, a large transfer, an irregular payment to an individual, a purchase that could be either personal or business, needs your explanation before it can be categorised correctly and confidently for BAS purposes.
How We Verify Your Identity Before We Start
Before we can begin work for any new client, we're required under the Tax Practitioners Board's Code of Conduct to complete a formal proof of identity check, generally two separate identity documents unless a primary photo ID like a driver licence or passport can be verified visually on a call. This isn't a True Tally-specific formality, it's a standard obligation on every registered BAS and tax agent in Australia, reinforced further in 2026 as the TPB aligned its identity requirements with AUSTRAC's updated anti-money-laundering rules. For an existing client, we periodically re-confirm identity as well, particularly before a catch-up engagement involving access to payment platforms and historical financial records.
What a Catch-Up Engagement Looks Like, Start to Finish
It generally runs in the same sequence regardless of how far behind a business is. First, proof of identity and a scoping conversation about how many periods are outstanding and which platforms are involved. Second, we collect bank statements and set up read access to PayPal, Stripe or any other payment platform in use. Third, reconciliation, working through the outstanding period methodically, flagging anything ambiguous for you to explain rather than guessing. Fourth, once the file is genuinely current, we lodge the outstanding BAS. Fifth, where the compliance history and circumstances support it, we submit a formal remission request for the Failure to Lodge penalties already applied.
Example: Eighteen Months Behind
A Geelong trades business came to us eighteen months behind on bookkeeping and six BAS periods overdue, with Failure to Lodge penalties already applied to each one. After proof of identity and a scoping call, we collected eighteen months of bank statements and PayPal access, the business processed a portion of client payments through PayPal. Roughly a dozen transactions needed the owner's explanation, mostly transfers between personal and business accounts during a stretch where the two had been mixed together. Once reconciled, all six BAS periods were lodged in sequence, and because the business had a clean lodgement history for the three years before falling behind, we submitted a formal remission request citing that history alongside a genuine family circumstance that had caused the gap. The penalties were substantially reduced as a result.
Watch: Catch-Up Bookkeeping and Late BAS Explained
True Tally: Catch-Up Bookkeeping for Geelong Businesses
Behind by a few months or a few years, we reconstruct your books, lodge what's outstanding, and pursue a penalty remission where the circumstances support it.
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