BAS and Bookkeeping: Setting Up Clean Records for FY27
BAS season is never the problem by itself.
The real problem is usually what happened in the weeks and months before it: uncoded transactions, missing receipts, mystery transfers, old payroll settings, personal expenses hiding in the business account and that one supplier invoice living rent-free in someone’s inbox.
As FY27 begins, now is the time to set up cleaner bookkeeping habits before the first quarter starts gathering dust.
For business owners, clean records make BAS easier, cash flow clearer and decision-making more reliable. For accountants and bookkeepers, clean records reduce back-and-forth, improve lodgement efficiency and help clients avoid last-minute panic.
Here is a practical FY27 setup checklist.
Why clean records matter for BAS
A Business Activity Statement, or BAS, is used by businesses to report and pay tax obligations such as GST, PAYG withholding and PAYG instalments. The ATO outlines BAS as part of the process for reporting and paying these obligations.
That means your BAS is only as accurate as the records sitting underneath it.
Clean bookkeeping helps confirm:
GST collected on sales
GST claimed on purchases
PAYG withholding amounts
PAYG instalments
Fuel tax credits, if relevant
Payroll-related amounts
Adjustments and corrections
Business versus private expenses
When records are messy, BAS preparation becomes detective work. And while accountants are excellent detectives, nobody needs Sherlock Holmes in the chart of accounts. 🕵️♀️
1. Reconcile all bank accounts to 30 June
Before FY27 properly begins, make sure FY26 is fully reconciled.
Check:
Business transaction accounts
Savings accounts
Tax accounts
Credit cards
Loan accounts
Petty cash, if used
Payment platforms such as Stripe, PayPal or Square
Any director or owner contribution accounts
The goal is simple: every transaction should have a home.
Unreconciled transactions should not roll into the new financial year like tiny accounting ghosts. If they relate to FY26, deal with them now while the context is still fresh.
2. Review your chart of accounts
The chart of accounts is the filing cabinet for the business.
Over time, it can become cluttered with duplicate expense categories, old codes, unclear labels and accounts that made sense three software migrations ago.
At the start of FY27, review:
Duplicate expense categories
Old or unused accounts
Accounts with unclear naming
GST coding defaults
Payroll-related accounts
Loan and finance accounts
Asset and depreciation accounts
Owner drawings or director loan accounts
Suspense or clearing accounts
A clean chart of accounts makes reports easier to read and reduces coding mistakes.
For accountants, this is also a good time to standardise client coding where possible, especially for recurring BAS work.
3. Check GST coding rules
GST errors are one of the easiest ways for bookkeeping to drift off course.
Review recurring rules for:
Bank fees
Merchant fees
Insurance
Motor vehicle expenses
Software subscriptions
Overseas purchases
Contractor invoices
Rent
Meals and entertainment
Asset purchases
Mixed-use expenses
Do not assume last year’s automated rules are still right.
Software rules are helpful, but they are not magic. They are obedient little machines, which means they will keep making the same mistake forever unless someone taps them on the shoulder.
4. Set up a receipt capture process
Missing receipts are one of the biggest causes of BAS delays.
Set a clear FY27 rule for how receipts will be captured.
Options may include:
Uploading receipts directly into accounting software
Forwarding invoices to a dedicated bills email address
Using a receipt capture app
Saving digital copies into a shared folder
Creating a weekly admin routine
Setting staff rules for business purchases
The process matters more than the tool.
A simple weekly system is better than an elaborate app nobody uses after 11 days.
5. Separate business and personal spending
Clean records start with clean bank behaviour.
Business owners should avoid using the business account for personal spending where possible. If personal transactions do occur, they should be coded correctly and reviewed regularly.
Check whether the business needs:
A separate tax savings account
A separate GST account
A dedicated business credit card
A clearer reimbursement process
Better owner drawings tracking
Fewer mixed-use purchases
For small businesses, separating personal and business spending makes bookkeeping faster, reports clearer and tax-time conversations much less awkward.
6. Review BAS lodgement frequency and key dates
Most quarterly BAS lodgements are due on the 28th day of the month after the quarter ends, except the December quarter, which is generally due on 28 February. The ATO lists quarterly BAS due dates as 28 October for July to September, 28 February for October to December, 28 April for January to March and 28 July for April to June.
Monthly BAS reporters generally need to lodge and pay by the 21st day after the end of the month.
For FY27, businesses should confirm:
BAS reporting frequency
GST registration status
PAYG withholding requirements
PAYG instalment obligations
Whether an accountant or BAS agent lodgement program applies
Internal bookkeeping cut-off dates
Client document deadlines
The lodgement due date is not the bookkeeping due date.
A better internal rule is to have records ready well before the BAS deadline, so there is time to review, query and correct.
7. Create a monthly bookkeeping rhythm
Quarterly BAS does not mean quarterly bookkeeping.
That is where many businesses trip over the shoelaces of their own admin.
A better rhythm is:
Weekly
Upload receipts
Send invoices
Review unpaid invoices
Check bank feeds are working
Capture supplier bills
Monthly
Reconcile bank accounts
Review aged receivables
Review aged payables
Check payroll reports
Review GST coding
Check cash flow
Review suspense accounts
Quarterly
Prepare BAS
Review GST reports
Check PAYG withholding
Confirm instalments
Review unusual transactions
Lodge and pay on time
Monthly bookkeeping keeps the BAS from becoming a quarterly excavation.
8. Review payroll records before the first BAS cycle
Payroll data often flows into BAS reporting, so it needs to be clean from the start.
Check:
Employee details
Tax file number declarations
Pay rates
Award or agreement settings
Leave accruals
Superannuation settings
Salary sacrifice arrangements
Allowances
Deductions
Terminated employees
STP reporting
For FY27, payroll also needs extra attention because Payday Super starts from 1 July 2026. Under the new rules, employers will need to pay super at the same time as salary and wages, with contributions generally required to reach the employee’s super fund within seven business days. Fair Work recommends employers review payroll systems and processes before the change begins.
For accountants and bookkeepers, this is a strong prompt to help clients move from “payroll processing” to “payroll system review”.
9. Clean up debtor and creditor records
Good BAS preparation is not only about tax coding. It is also about knowing what is owed and what is outstanding.
At the start of FY27, review:
Unpaid customer invoices
Old supplier bills
Credit notes
Duplicate contacts
Incorrect ABNs
Old customer records
Old supplier records
Payment terms
Invoice reminders
Bad debt candidates
This is especially useful for businesses that report GST on an accruals basis, because unpaid invoices and bills can still affect BAS reporting.
A clean debtor list also supports better cash flow conversations.
10. Check software access and integrations
Bookkeeping systems need a security and access review at least once a year.
Check:
Who has access to the accounting file
Whether two-factor authentication is active
User permission levels
Former staff access
Connected apps
Bank feed connections
Payroll integrations
Receipt capture tools
Payment platforms
Data backup options
For accounting firms, this is especially important when handling client files. Client financial records are sensitive, and access should match the person’s role.
Do not leave the keys under the digital doormat.
11. Set up a BAS review checklist
Before lodging each BAS, use a simple review process.
A useful checklist includes:
Bank accounts reconciled
Credit cards reconciled
Sales reviewed
GST on sales checked
GST on purchases checked
Payroll reports reviewed
PAYG withholding confirmed
Instalments reviewed
Large or unusual transactions checked
Asset purchases reviewed
Private-use adjustments considered
Suspense account cleared
Supporting documents attached
Client queries resolved
BAS saved with working papers
For accounting practices, this checklist can be turned into a standard internal workflow. That makes BAS preparation more consistent across clients and team members.
12. Educate clients on what “good records” actually means
Many clients want clean records, but they do not always know what that looks like.
Accountants and bookkeepers can help by giving clients clear expectations.
For example:
Send invoices promptly
Upload receipts weekly
Do not mix personal and business expenses
Respond to bookkeeping queries quickly
Keep supplier invoices in one place
Tell your adviser before buying major assets
Keep payroll records updated
Review reports monthly, not just at BAS time
Simple education reduces repeated errors.
It also positions the accountant or bookkeeper as a proactive adviser, not just the person who appears at lodgement time holding a spreadsheet lantern.
13. Keep records for the required period
The ATO generally requires businesses to keep records long enough to explain their transactions and tax position. Business records usually need to be kept for five years, and they need to be accessible if requested.
This includes records such as:
Tax invoices
Receipts
Bank statements
Payroll records
Superannuation records
Contractor invoices
Sales records
Expense records
Motor vehicle records
Loan documents
Asset purchase documents
BAS working papers
Digital record keeping is fine, but records need to be clear, complete and retrievable.
“Somewhere in my inbox” is not a system. It is a treasure hunt with penalties.
14. Use FY27 to move from reactive to routine
The best BAS process is not built in the week before lodgement.
It is built through small, repeatable habits:
Weekly receipt capture
Monthly reconciliation
Clean GST coding
Clear payroll checks
Regular report reviews
Early client queries
Documented processes
Consistent BAS review steps
For business owners, this creates more confidence.
For accountants and bookkeepers, it creates fewer emergencies and better client conversations.
Final thought: clean records create calmer quarters
BAS preparation becomes much easier when the bookkeeping foundations are right.
FY27 is the ideal time to reset those foundations: tidy the chart of accounts, review GST coding, clean up payroll, set internal dates, improve receipt capture and build a monthly bookkeeping rhythm.
The reward is not just easier BAS lodgement.
It is better business visibility, fewer surprises and more useful conversations between business owners and their advisers.
Need help getting your FY27 records and insurance settings in order?
Abacus works with accounting professionals and small practices that want practical, reliable support around professional indemnity and related insurance needs.
As you help clients set up cleaner records for FY27, it is also worth reviewing whether your own practice details, services and risk profile are up to date.
Contact Abacus to review your FY27 insurance needs and renewal process.
