GST and BAS for BJJ Gym Owners — A Practical Australian Guide for 2026

This is not financial advice. It's a practical orientation for BJJ gym owners trying to understand the ATO basics before they sit down with their accountant. Talk to a registered tax agent before acting on anything here.

That said. Most BJJ academy owners we work with started teaching because they love the art, not because they wanted to learn Australian tax law. The tax stuff is genuinely confusing the first time around. This post breaks down the bits that matter for a typical AU BJJ gym in 2026.

When you have to register for GST

You must register for GST when your annual turnover hits or is expected to hit $75,000 in any 12-month period. Turnover is gross income, not profit. If you're charging $200/month per member and you have 32+ active members, you're already past the threshold.

You can also register voluntarily before $75k. Some gyms do this because they want to claim GST credits on their setup costs (fitouts, mats, gi orders). The downside is you have to charge GST on every membership from day one and lodge a BAS every quarter, which is admin overhead.

When in doubt, talk to your accountant. The threshold trigger isn't a "should I" question, it's a "do I have to" question once your numbers cross the line.

What changes once you're registered

Three things, in order of how much they affect your day-to-day.

One, every membership invoice now has GST on it. A $220 monthly membership becomes $200 + $20 GST. You're collecting that $20 on behalf of the ATO and remitting it via your BAS each quarter. It's not your money to keep, even though it sits in your account temporarily.

Two, you get to claim GST credits on most of your business expenses. Mats, gi orders, fitout costs, software subscriptions, advertising, accountant fees, even the coffee you buy for your front desk. Anything purchased "for the business" with GST on the invoice generates a credit you offset against the GST you collected.

Three, you have to lodge a BAS. Quarterly is most common for small gyms. The BAS asks how much you collected, how much you can claim, and the difference is what you remit (or what the ATO refunds you).

What gym-specific items typically attract GST

Most gym revenue is GST-applicable. Memberships, drop-in fees, private lessons, gi sales, retail merch, seminar tickets — all standard 10% GST.

Two things to flag with your accountant:

Trial classes that are genuinely free aren't taxable, but if you're charging anything (even $5), GST applies.

Sponsorships and partnerships with local businesses (e.g. a chiropractor pays you $500/month to be the gym's recommended provider) are GST-applicable income.

What you can claim

Almost every gym expense is claimable as long as the supplier is GST-registered (you can usually tell from their invoice format). The big ones for BJJ academies:

• Rent and outgoings (your landlord usually charges GST, though residential properties don't)
• Insurance premiums (talk to your accountant — some insurance is GST-free)
• Software subscriptions including Combat Control
• Mats, mat tape, gi orders, equipment
• Marketing spend (Meta, Google, local sponsorships)
• Accountant and bookkeeper fees
• Staff training (instructor courses, IBJJF refereeing, first aid)
• Travel for legitimate business purposes (competition coaching trips, ASCA seminars)

Things you can't claim or have to apportion:

• Personal use of business equipment (your own gi if you're a professor)
• Entertainment that isn't directly business (the post-comp dinner is mostly not)
• Penalties and fines

Your accountant will sort the apportionment. Just keep good records.

BAS lodgement — what actually happens

Quarterly BAS due dates in 2026: 28 October (Q1), 28 February (Q2), 28 April (Q3), 28 July (Q4). If you have a registered tax agent lodging on your behalf, you typically get a four-week extension on each.

The form has fields for:

• G1: Total sales (gross income, GST-inclusive)
• 1A: GST on sales (the 10% you collected)
• 1B: GST on purchases (your credits)
• W1, W2: PAYG withholding for employees
• 5A: PAYG instalment for your own income tax

Most BJJ gym owners running through Xero or Quickbooks will have a button that auto-prepares these from their bookkeeping. If you're still on spreadsheets, switch to proper accounting software before you scale past 50 members. The hours saved on BAS prep alone justify the subscription.

PAYG instalments — the surprise

When you lodge your first business income tax return, the ATO often puts you on PAYG instalments. This means you pay your expected income tax in quarterly chunks rather than as one lump sum at year-end.

The amount is set based on your previous return's profit. It's annoying for new gyms because the first year's profit (after fitout) is often much lower than year two's, but the ATO will adjust if you ask. You can also vary the instalment yourself if you genuinely expect lower income, though under-paying creates an interest liability if you got it wrong.

Common mistakes BJJ gym owners make

Treating GST collected as gym revenue. It's not yours. Set aside the 10% in a separate bank account or sub-account so you have it ready at BAS time. Cash-flow disasters happen when an owner uses GST money to cover wages, then realises in October they owe the ATO $12k they don't have.

Missing the registration threshold. Easy to do if you're growing fast. The day you cross $75k in any rolling 12-month window, you have 21 days to register. Backdating is messy.

Not separating private and business expenses. The instinct to throw the gym EFTPOS at a personal purchase will cost you later. Separate accounts. Strict.

Skipping the bookkeeper. A bookkeeper at $80–150/month is the highest-ROI hire most gyms can make. They'll save you the GST credits you'd have missed, file your BAS on time, and free up your evenings for actually coaching.

The takeaway

Register when you cross $75k turnover. Quote prices GST-inclusive so members never get a price shock. Keep meticulous records (your accounting software does most of this for you). Lodge your BAS on time. Pay PAYG instalments. Hire a bookkeeper if you can swing it.

None of this is hard. It's mostly about knowing the rhythm and not letting the admin pile up. Block one Friday afternoon a month for paperwork and you'll never be behind.

Combat Control surfaces a CSV export of every transaction so your bookkeeper has clean data to work with each BAS quarter — but the same is true of any half-decent gym software. The real win is just having the discipline to look at the numbers.