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GST and BAS Reporting Software for Australian Businesses

Automated GST calculations across every transaction. ATO-ready BAS preparation reports — download and lodge via the ATO Business Portal or your tax agent.

How It Works

Automatic GST Calculation

GST is calculated on every invoice, bill, and expense automatically based on your tax rates.

BAS Preparation Reports

Generate BAS-ready reports covering all G-codes, 1A, 1B, W1, and W2 — ready for your tax agent or the ATO portal.

ATO-Ready Reporting

Reports follow the ATO BAS field structure (G1–G15, 1A, 1B, W1, W2). Registrum prepares the figures — you or your registered tax/BAS agent then lodge via the ATO Business Portal.

Real-Time Tracking

GST liability is tracked in real time across all transactions so you always know where you stand before BAS is due.

BAS Fields Covered

G1Total sales
G2Export sales
G3Other GST-free sales
G4Input taxed sales
G5–G9Subtotal calculations
G10Capital purchases
G11Non-capital purchases
G12–G15Purchase adjustments
1AGST on sales
1BGST on purchases
W1Total salary & wages
W2Amount withheld from payments

Registrum prepares all BAS figures automatically. Download your ATO-ready export and lodge via the ATO Business Portal or your registered tax agent.

Simplify your BAS preparation

Start your free 14-day trial — no credit card required.