BAS Prep

Business & BAS setup

A quick profile so income and expenses get sensible default coding. You confirm everything later.

What the business does Registered for GST? Accounting basis

BAS period

BAS frequency Period

Upload bank transactions

CSV with columns: Date, Description, Amount (positive = money in, negative = money out). You can select multiple files — every account the business uses (cheque, savings, credit card) — and they'll be combined. You can add more statements and cash transactions on the next step.

Reconcile & code

Check totals, then review how each line was coded. Edit category, GST treatment or a GST-free portion inline. ↺ sends a line back to the review queue.

Transactions0

Money in$0

Money out$0

Net movement$0

Still to review0

Add another statement

Add a cash / manual transaction

Date Description Amount (+in/−out) Category GST GST-free $

GST-free portion applies to 10% GST lines. You can also adjust or split any line on its row below.

Review queue

Resolve the unclear items. Answers are saved as rules so next quarter they auto-code. Need finer control (e.g. a part GST-free amount)? Edit the line on the Reconcile step.

Profit & Loss

Balance Sheet

Opening balances

Enter the client's opening position (closing figures from the prior period). Closing balances = opening + this period's movement. Leave at 0 to show movement only.

Cash-basis balance sheet derived from bank data plus the opening balances above.

BAS figures

Income tax to set aside for this BAS period

Annualises this period's net profit, applies 2025-26 resident rates, then apportions the tax back to the period. A planning estimate only — not a tax return or tax advice.

Other annual taxable income Include 2% Medicare levy

Simplified estimate: assumes profit is evenly spread across the year, ignores tax offsets (e.g. LITO), PAYG instalments already paid, and Medicare levy phase-in. For planning only.

Review & finalise

Check the figures, agree to the declaration below, then finalise to unlock your reports.

Declaration

I have reviewed every transaction and confirm the categorisation and GST treatment are correct to the best of my knowledge. I understand this tool only helps prepare figures and does not provide tax or BAS advice, that the auto-suggested coding is a starting point I am responsible for checking, and that I am responsible for the accuracy of these figures and for anything I lodge with the ATO.

Lodging yourself? Enter these figures into your BAS in myGov.

Want some advice first? — $50

Ask William any questions about your figures before you lodge it yourself.

Pay $50 — get advice →

Want it lodged for you? — $50

William reviews and lodges the BAS for you as your registered BAS agent.

Pay $50 — lodge for me →

After payment William will be in touch via email. William — will.simplebooks@gmail.com · BAS Agent 26126770

Audit trail

This is a self-help tool that helps you prepare BAS figures from your own bank data. It does not provide tax or BAS advice and does not lodge anything for you. The auto-suggested coding is a starting point only — you are responsible for reviewing every transaction and for the accuracy of the figures and anything you lodge with the ATO. If you'd like a registered BAS agent to review your figures before you lodge, that option is available.

Do your own BAS, without the headache

How it works

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