BAS basics every small business owner should understand

What the BAS actually reports

The business activity statement is a single form that brings together several obligations. For most small businesses that means GST collected on sales and GST paid on purchases, PAYG withholding if you have employees, and PAYG instalments toward your own income tax. Some businesses also report items such as a fringe benefits tax instalment.

Because it combines several things, a BAS can look intimidating. In practice, each figure traces back to ordinary records — your sales, your purchases, and your payroll. If those are accurate, the BAS largely writes itself.

Cash versus accrual: why timing matters

Whether you account for GST on a cash or accrual basis changes when a sale or purchase lands in a period. On a cash basis, GST is counted when money actually moves; on an accrual basis, it is counted when you issue or receive an invoice. Mixing the two, or switching without realising, is a frequent source of mismatches between the BAS and the bank.

The GST coding mistakes that cost the most

GST is not charged on everything, and it cannot be claimed on everything. These are the transactions where errors most often creep in:

• Bank fees and interest — generally input-taxed, so there is no GST to claim.
• Government charges such as ASIC fees, council rates, and motor vehicle registration — usually no GST.
• Wages and superannuation — these are not purchases and carry no GST.
• GST-free items such as most basic food, certain health and education services, and exports.
• Residential rent — input-taxed, so no GST is charged or claimed.
• Purchases from suppliers who are not registered for GST — no GST to claim even if the invoice looks like it includes some.

Good to know — To claim GST on a purchase over $82.50 (including GST), you generally need a valid tax invoice from the supplier. Keeping those invoices as you go avoids a scramble at lodgement.

Treat GST and PAYG withholding as money you are holding

One of the most common cash-flow mistakes is spending GST that was collected on sales. The GST portion of a sale was never really business income — it is money collected on behalf of the ATO. The same is true of PAYG withheld from staff wages.

A simple habit that prevents lodgement-day stress is moving the GST and withholding portions into a separate account regularly, so the funds are there when the BAS falls due.

Lodgement cycles, deadlines, and getting help

Businesses report monthly, quarterly, or annually depending on turnover and registration. Quarterly is the most common for small businesses. Lodging through a registered tax or BAS agent usually provides additional time to lodge and pay, and gives you a second set of eyes on the coding before it is submitted. If your records are not ready as a deadline approaches, contact the office early rather than lodging figures you are unsure about.