April 1, 2026 | Tax Setup

How to Register for GST: Step-by-Step Guide

Key Takeaways

In 2026, many Australian sole traders and small business owners are confused by when and how to register for Goods and Services Tax (GST). With the ATO’s increasing use of bank-feed data matching, missing the registration threshold can lead to severe back-taxes and penalties. Here is the ultimate step-by-step guide to GST registration.

Who Must Register?

You MUST register for GST if:

Step-by-Step Registration Process

  1. Get an ABN: You cannot register for GST without an Australian Business Number. If you don't have one, apply for an ABN first.
  2. Choose Your Accounting Method: You can choose between **Cash** (simplest for small biz) or **Accruals** accounting for your GST reporting.
  3. Select Your Reporting Frequency: Most small businesses choose to lodge their Business Activity Statement (BAS) quarterly.
  4. Apply Online: You can register via the **ATO's Business Portal** (using myGovID) or through your registered tax agent (like PrepMyBook).
  5. Once Registered: You must start including GST (10%) in your prices and issuing **Tax Invoices.**

💡 Tip: You can also choose to **voluntarily register** for GST even if your turnover is below $75,000. This allows you to claim back the GST you pay on your business expenses, but you'll have to lodge quarterly BAS.

Summary: Better Data, Easier Tax

Registering for GST is a milestone in your business's growth—it means you're reaching a significant level of turnover. However, it also introduces more compliance paperwork. At PrepMyBook, we help our clients register for GST and set up their Xero so that the 10% is calculated automatically on every sale and purchase. If you’re approaching $75k, let’s get you ready.

Simplify Your GST Registration

Our tax agents can handle your GST and ABN registration and ensure you're fully compliant from day one. Let's set up your business correctly for the 2026 financial year.

Talk to a GST Agent