✅ Updated 2026

Yes — most tradies in Australia charge GST. But not all tradies have to. It depends on how much you earn. Here is the complete, plain-English answer to whether you need to charge GST, what happens when you cross the threshold, and what your invoices must show.

📋 In This Article

  1. →When you MUST register
  2. →When it's optional
  3. →Benefits of registering early
  4. →What to put on your invoice
  5. →BAS and paying GST
  6. →Common mistakes
  7. →FAQs

When a Tradie MUST Register for GST

GST registration is compulsory when your business turnover reaches or is likely to reach $75,000 in any 12-month period.

The $75,000 threshold is based on your gross turnover — total invoiced revenue before any deductions. A plumber who invoices $90,000 a year must be registered, even if their net profit after expenses is only $50,000.

When to register: You must register within 21 days of knowing that your turnover has exceeded $75,000 or is expected to reach it. Don't wait until your tax return — register through abr.gov.au or ask your accountant to do it immediately.

Once registered, you must:

  • Add 10% GST to all your invoices
  • Lodge a BAS (Business Activity Statement) quarterly or monthly
  • Pay the net GST (what you collected minus what you paid) to the ATO
  • Keep tax invoices for all purchases so you can claim GST credits

When GST Registration Is Optional

If your turnover is under $75,000, GST registration is optional. You can choose to register or not.

Tradies who don't register cannot charge GST — it's one or the other. An unregistered tradie who adds "GST" to their invoices is doing so incorrectly and must remove it.

Benefits of Registering Early — Even Under $75,000

Some tradies voluntarily register for GST even before they hit the threshold because:

  • You can claim GST credits on all your business purchases. If you buy $5,000 of tools in a quarter, you claim back $454.55 in GST — a real cash benefit
  • You look more established — registered businesses appear more professional to commercial clients and builders
  • Chattel mortgage GST benefit — if you buy a work vehicle via chattel mortgage while GST-registered, you claim the GST back on your next BAS. On a $50,000 ute that's $4,545 back. Significant.

The downside: more admin (quarterly BAS) and your prices effectively increase by 10% for residential clients who can't claim GST back.

What Must Go on a Tradie's GST Invoice

If you are GST-registered, every invoice over $82.50 (including GST) must be a tax invoice and include:

  • The words "Tax Invoice" clearly visible
  • Your business name and ABN
  • Date of the invoice
  • Description of the goods or services provided
  • The GST amount — either listed separately or a statement that the total includes GST
  • Total price including GST

For invoices of $1,000 or more (including GST), you must also include the buyer's ABN or name.

→ Full guide to tradie invoicing — what must be on every invoice →

→ Free ATO-compliant invoice generator →

BAS — Paying Your GST to the ATO

Registered tradies lodge a BAS each quarter (or monthly for higher turnover). Your BAS summarises:

  • 1A — GST on sales: total GST you collected from clients
  • 1B — GST on purchases: total GST you paid on business expenses
  • Net GST: 1A minus 1B — this is what you pay (or what the ATO refunds you)

Example: You collected $9,000 GST from clients (1A). You paid $2,000 GST on tools, materials and expenses (1B). Net GST owed to ATO: $7,000.

Xero and Rounded both calculate and pre-fill your BAS automatically based on your invoices and expenses. Lodging BAS directly to the ATO through these platforms takes about 5 minutes per quarter.

Common GST Mistakes Tradies Make

  • Not registering after hitting $75,000 — the ATO can back-date your registration and require you to remit GST you never collected from clients. Painful.
  • Spending your GST money — the GST you collect belongs to the ATO, not you. Keep it in a separate account or sub-account until BAS time.
  • Not claiming GST credits on purchases — every business expense that includes GST (tools, fuel, materials) is a credit you can claim back. Missing these costs you real money.
  • No tax invoice from suppliers — you need a valid tax invoice to claim a GST credit. A receipt is not always enough if it doesn't show the supplier's ABN and a GST amount.
  • Charging GST when not registered — illegal. If you're not registered, you cannot add GST to invoices.

A tradie gave me a quote — do I pay GST on top?

That depends on whether they are GST-registered. If registered, they must charge GST. If not registered (turnover under $75,000 and chose not to register), they cannot charge GST. Always ask for a tax invoice showing their ABN — if there's a GST line, they're registered. If not, there's no GST component.

Can a tradie charge different rates for cash vs card?

A tradie can offer a discount for cash payment, but they cannot legally charge different prices based on how they're paid and then adjust the GST treatment. All sales should be invoiced and all GST collected and remitted.

What's the penalty for not registering for GST when I should have?

The ATO can back-date your registration to when you should have registered. You'll owe GST on all sales from that date — even if you didn't collect it from clients. Plus penalties and interest. Register within 21 days of hitting $75,000.

I'm under $75k now but growing fast — should I register early?

Yes, probably. Once you're clearly heading toward $75,000 in a 12-month period, registering early means you start claiming GST credits on all your purchases immediately — including that ute you just financed. The admin overhead (quarterly BAS) is manageable with basic accounting software.

## GST Registration in Real Life: What Actually Changes When You Hit $75,000 The $75,000 turnover threshold isn't just a number on paper. It's the moment your tradie business changes. Here's what actually happens — and what you need to do practically. **When you cross $75,000 in annual turnover:** You must register for GST with the ATO within 21 days. This applies whether you reached it gradually or had one big contract that pushed you over. Once registered, you charge 10% GST on all invoices (with some exceptions like residential rent and some medical services — but these rarely apply to tradies). The registration date matters. If you hit $75,000 on 15 March, you register immediately. Your first GST return is due 28 April (the end of the quarter). From that point forward, you lodge returns quarterly — even if your turnover drops below $75,000 later. **What changes on your invoices:** - ABN and "GST registered" must appear - Line items must show the GST amount separately - Your total invoice price now includes 10% more - You must keep detailed records of every transaction **What you can claim back:** This is the silver lining. Once registered, you claim GST credits on materials, tools, vehicle expenses, and almost anything else you buy for your business. If a plumber buys copper pipe for $110 (including $10 GST), they claim that $10 back. Over a year, these add up significantly. **The cash flow trap:** Many tradies don't realise: GST registration improves your profit margin, but it changes cash flow. If you buy materials upfront with GST, you don't claim that back until you lodge your quarterly return and the ATO processes it. For cash-based trades like carpentry or electrical work, this can create a timing gap. Invoice promptly. Lodge returns promptly. Plan for it. **Voluntary registration below $75,000:** Some tradies register voluntarily even if they're under the threshold. This works if: - You plan to hit $75,000 soon and want to start claiming GST credits now - Most of your clients are other GST-registered businesses (they prefer to buy from registered suppliers) - Your materials costs are high relative to labour It doesn't work if you mainly service households. A homeowner doesn't care about GST; they just see your price went up 10%.

TIP: Don't rush to register voluntarily without doing the maths. Speak to an accountant. If 80% of your work is residential, voluntary registration often costs more in admin time than it saves in GST credits. If 80% is commercial, it's usually worth it.

## Record-Keeping and GST Compliance: The ATO's Expectations The ATO expects GST-registered tradies to keep records. Not just invoices — actual records that prove every dollar in and out. Get this wrong, and you face penalties, interest charges, and audits. **What you must keep:** Every invoice you issue (even if unpaid) — must show ABN, GST amount, date, description of work. Every receipt for business spending — materials, fuel (at 88c/km), tools, equipment. Bank statements or payment records showing money in and out. Timesheets or job records showing who did what work and when. If you're a sole trader, these can be basic — a notebook is technically fine. But when the ATO asks, you need to produce them. If you can't, they can disallow your claims or estimate your income upward (and you pay tax on that estimate). **How long to keep them:** Five years from the date of the transaction. For a job completed in March 2025, keep records until March 2030. **Digital vs. paper:** Digital is better. It's searchable, backed up, and easier to hand over if audited. Tools like Xero or Tradify do this automatically — every invoice and receipt is logged, dated, and stored. They integrate with your bank, so reconciliation is semi-automatic. **Common compliance mistakes:** 1. **Not separating GST on invoices** — You write "$1,100" but don't show the GST component. The ATO sees this as non-compliant. Always show "$1,000 + $100 GST = $1,100". 2. **Mixing personal and business spending** — Claiming a car as a business expense when you use it personally too. You can claim the business portion (use the ATO's cents-per-kilometre method: 88c/km in 2026), but only for work-related driving. 3. **Claiming GST on expenses you didn't pay GST for** — If you buy secondhand tools from a mate (no invoice, no GST), you can't claim GST credit. Only claim what you actually paid GST on. 4. **Not logging cash jobs properly** — Cash payments are income. You must record them and declare them, and if you're GST registered, you charge GST on cash jobs too. --- ## GST Registration Comparison Table | **Your Annual Turnover** | **GST Registration** | **You Charge GST?** | **You Claim GST Credits?** | **Quarterly Returns?** | |---|---|---|---|---| | Under $75,000 | Optional | Optional | No (unless voluntarily registered) | No | | $75,000–$150,000 | Mandatory | Yes | Yes | Yes | | Over $150,000 | Mandatory | Yes | Yes | Yes | | Planning to exceed $75,000 within next 12 months | Can register early | Yes (once registered) | Yes | Yes | --- ## FAQ: GST for Tradies

Do I have to register for GST if I'm a sole trader tradie?

Yes, if your annual turnover exceeds $75,000. "Turnover" means total income from your tradie work before expenses. It doesn't matter if you made a profit or loss — if the income totals over $75,000, you must register within 21 days. The ATO doesn't care about your business structure; they care about your turnover. A sole trader, partnership, or company all face the same $75,000 threshold.

What happens if I don't register for GST when I should have?

The ATO will find out eventually. They cross-reference business activity statements, bank deposits, and supplier records. If you didn't register and should have, you face back-dated GST liability (you owe GST on all that income, calculated from the point you exceeded $75,000), plus penalties of up to 75% of the unpaid tax and interest at the ATO's current rate. It's much cheaper to register on time. If you've already missed the deadline, contact the ATO and register now — they're more lenient if you come forward than if they catch you.

Can I claim GST on a vehicle I use for work?

If you're GST registered and you buy a vehicle or parts with GST, yes — you can claim the GST credit on the purchase price. However, you claim work-related driving expenses using the ATO's cents-per-kilometre rate (88c/km in 2026), not GST credits. So if you drive your ute 15,000 km a year for work, you claim $13,200 (15,000 × 88c) as a deduction. You don't separately claim the GST on the ute purchase — the cents-per-km method is simpler and available to all tradies, regardless of GST status. Keep a logbook to prove the distance is work-related.

--- **Action point:** If you're approaching $75,000 in turnover, register now — not after you hit it. You have 21 days once you cross the threshold, but registering early means you're ready on day one. Set up proper invoicing (your invoices must be compliant), and choose accounting software like Xero or Tradify that handles GST automatically. If you're unsure, a tax accountant costs $300–500 for a one-off chat and is worth every dollar.