GST Calculator for Australian Repair Shops + Complete BAS Guide

GST is ten percent. That sounds simple. In practice, most repair shop owners are either adding 10% on top of their prices (wrong — that means customers pay 110% of the board price), subtracting 10% from the total (also wrong — that underpays the ATO), or just ignoring it entirely and hoping it averages out at BAS time (it doesn't).

The correct method is a single formula. This guide covers it clearly, includes a free calculator, and explains the complete BAS workflow for repair shops.

How GST Works on Phone and Computer Repair Invoices

Is GST Charged on Labour?

Yes. Labour for phone and computer repairs is a taxable supply under Australian GST law. If you charge $80 for an hour of diagnostic and repair work, that $80 must include the 10% GST. There are no exemptions for labour in the repair industry — unlike some other service sectors. Every dollar you charge for your time is a taxable supply.

Is GST Charged on Parts?

Yes, in almost all cases. New parts sold as part of a repair — screens, batteries, charging ports, cameras, back glass — are taxable supplies. The GST is embedded in the price you charge the customer, not added on top. The exception is certain second-hand goods sold on their own (not as part of a repair service), which may qualify for special treatment — but for a standard repair job combining parts and labour, everything is taxable at 10%.

What About Warranty Repairs?

If you're doing a warranty repair at no charge to the customer — either your own 90-day warranty or a manufacturer warranty claim — there is no taxable supply and therefore no GST to charge. No invoice is issued, or if one is for record-keeping purposes, the total is zero. GST applies only when money changes hands for a taxable supply.

How to Calculate GST on a Repair Invoice — The Formula

Free GST Calculator for Repair Shops

Enter a price below to instantly calculate the GST component. Choose whether your price already includes GST (standard for repair shops) or whether you need to add GST on top.

What Is a BAS and When Does a Repair Shop Need to Lodge One?

A Business Activity Statement (BAS) is a form you lodge with the ATO that reports how much GST you collected from customers and how much GST you paid on business purchases (called input tax credits). The difference is what you owe — or what the ATO owes you.

You must register for GST — and therefore lodge BAS — once your annual turnover reaches or is expected to reach $75,000. For most repair shops doing more than 3-4 jobs per day, this threshold is crossed within a few months of opening. Once registered, you lodge quarterly (most common for small shops) or monthly.

BAS Due Dates 2025–2026 — Australian Repair Shop Calendar

Quarterly BAS lodgements are due 28 days after the end of each quarter. Mark these dates now — the ATO charges interest on late payments.

How to Generate a BAS Report from Your Repair Invoices

At the end of each quarter, you need three numbers for your BAS:

1. Total GST collected — the sum of the GST component on every invoice in the quarter
2. Total GST paid on purchases — the GST on parts, tools, and business expenses you bought (input tax credits)
3. Net GST payable — number 1 minus number 2. This is what you pay (or receive from) the ATO

If you're doing this manually — exporting from spreadsheets, adding up GST columns, cross-checking against your bank statements — it typically takes 2–4 hours per quarter. At the end of a busy December, that's the last thing you want to be doing in February.

How RepairBill Handles GST and BAS Automatically

RepairBill was built with the Australian BAS workflow as a core requirement, not an afterthought.

GST-inclusive by default. Every invoice RepairBill generates defaults to GST-inclusive pricing. When you save an invoice for $280, RepairBill stores $254.55 as the base and $25.45 as GST. You never have to configure this — it's correct from day one.

BAS quarters tracked automatically. Every saved invoice is automatically tagged to the correct BAS quarter based on the invoice date. Q1 Jul–Sep, Q2 Oct–Dec, Q3 Jan–Mar, Q4 Apr–Jun — the assignment is automatic. No manual categorisation required.

Quarterly BAS report in one click. The Reports tab shows your revenue and GST collected for each quarter. When BAS time comes, open RepairBill, go to Reports, select the quarter — your total GST collected is right there. Hand it to your accountant or enter it directly into the ATO's Business Portal.

Australian Financial Year. All annual reporting in RepairBill uses the Australian Financial Year (1 July to 30 June) — not the calendar year that US software defaults to.

Frequently Asked Questions