What Sydney Startups Should Know About GST & BAS

The first invoice can make a startup feel real.

A customer says yes. Money is coming in. The product, service, app, platform, clinic, consultancy, online store or new business idea has finally moved from planning into trading.

Then the tax questions start.

• Do I need to register for GST?
• Should I charge GST on this invoice?
• What is a BAS?
• Do I need accounting software now?
• What if I am not profitable yet?
• Can I claim GST credits on startup costs?
• What happens if I cross the GST threshold faster than expected?

I’m Rafal Slowinski, Director of Tax Accounting Group Pty Ltd. When I work with Sydney startups, I try to deal with GST and BAS early, before the first year becomes a cleanup job. A startup does not need heavy accounting for its own sake, but it does need clear decisions about registrations, invoicing, records, and cash flow before the business becomes harder to untangle.

GST Is Not Only A Later Problem

Many founders think GST is something to worry about once the business is bigger.

Sometimes that is true.

Sometimes it is not.

The GST question depends on what the business does, expected turnover, registration requirements, customer type and how quickly the startup may grow.

Business.gov.au explains that if you have started a new business, you should register for GST if you expect your GST turnover to reach $75,000 in the first year. It also explains that you need to register within 21 days of becoming aware that your GST turnover will go over the threshold. You can read the official guidance here:  Register for goods and services tax.

The mistake is waiting until the threshold has already been crossed, invoices have already been sent, and the founder is not sure whether GST should have been charged.

A Sydney startup should think about GST early if:

• sales may grow quickly
• customers are other businesses
• the pricing model is being built
• subscriptions or recurring revenue are planned
• online sales may scale
• marketplace or platform income is involved
• contract work is starting
• grants or funding are expected
• the business may buy large startup equipment or software
• the founder wants to claim GST credits

GST affects more than tax. It affects pricing, invoices, cash flow, accounting software and how the startup explains its numbers later.

If GST treatment is already unclear, my page on  GST advisor in Sydney explains how I review the transaction before relying on a guess.

The GST Threshold Should Be Watched, Not Remembered Later

The $75,000 GST turnover threshold is easy to quote and easy to misunderstand.

A startup founder may think, “I am nowhere near that yet,” then win a larger contract, launch paid subscriptions, receive strong online orders, sign a few retainers or scale faster than expected.

The threshold should be monitored during the year, not discovered after the fact.

That means tracking sales properly from the beginning. If invoices, platform sales, subscriptions, deposits, customer payments and recurring revenue are scattered across different systems, the founder may not see turnover clearly enough.

I usually want startups to know:

• What income has already been earned?
• What income is contracted or expected?
• Are invoices being issued regularly?
• Are sales being tracked gross or net of platform fees?
• Is the business likely to reach $75,000 within the relevant period?
• Will GST registration affect pricing?
• Will the business need to update invoices, software and terms?
• Should voluntary registration be considered earlier?

This is not about panicking. It is about avoiding a surprise.

If you are not sure whether the startup is approaching the threshold, the accounting file should be set up to show that clearly.

BAS Is The Report That Follows GST Registration

Once a business is registered for GST, BAS becomes part of the process.

The ATO’s  Business Activity Statements guide explains that BAS is used to report and pay taxes, including GST and PAYG.

For startups, BAS can feel unfamiliar because the founder may still be focused on the product, service, customers and cash runway.

But the BAS does not wait until the startup feels mature.

If the business is registered for GST, the activity statement may need to report GST collected on sales and GST credits on business purchases. If the startup has employees, BAS may also involve PAYG withholding. PAYG instalments may also become relevant depending on the tax position.

The BAS is not just a form. It reflects the records behind the business.

That means the startup needs to track:

• sales invoices
• GST charged
• supplier invoices
• GST credits
• bank transactions
• software subscriptions
• contractor payments
• employee wages if staff are hired
• PAYG withholding if applicable
• asset purchases
• private or mixed-use expenses
• unusual payments or refunds

If those records are weak, the BAS will be weak.

If activity statements are already becoming a pressure point, my page on  BAS accountant in Sydney explains how I review the figures before lodgement.

The First Invoice Should Be Set Up Correctly

A startup’s first invoice can create problems if it is built on the wrong assumptions.

If the business is not registered for GST, the invoice should not simply add GST as if it is registered. If the business is registered, the invoice should show GST correctly where it applies. If the customer is overseas, the GST treatment may need to be reviewed. If the sale involves digital products, services, subscriptions, platforms or mixed supplies, the details matter.

The first invoice also sets the tone for the records.

• Who is the customer?
• What was sold?
• Was GST included?
• When was the invoice issued?
• When was payment received?
• Was the payment full or partial?
• Were platform or merchant fees deducted?
• Was the sale recorded in the accounting file?
• Can the founder explain the transaction later?

A startup invoice should not be treated as a casual PDF. It is the beginning of the financial trail.

If the invoice is unclear, the BAS, GST position and tax return may become unclear too.

Startup Costs Need Proper Records From Day One

Before the first sale, founders often spend money.

Website costs. Branding. Software. Stock. Prototype development. Contractors. Equipment. Legal documents. Business registrations. Insurance. Advertising. Professional advice. Laptops. Subscriptions. Domain names. Payment systems. Market research. Workspace costs.

Some of these costs may be deductible. Some may be capital. Some may include GST credits if the business is registered for GST and meets the rules. Some may be private or mixed-use. Some may need to be recorded as founder contributions to the business.

The ATO’s  record-keeping rules for business explain that businesses must keep records of transactions relating to tax, super and registrations.

For startups, this is practical.

If a founder pays for early costs personally, the business needs to know what happened.

• Was it a founder loan?
• Was it a reimbursement?
• Was it a business expense paid personally?
• Was it a capital contribution?
• Was it private spending?
• Was it connected to a company that did not exist yet?

Those answers matter later. A startup should not wait until tax time to reconstruct early spending from screenshots and card statements.

If the source documents are already scattered, my page on  data-entry accountants in Sydney explains how to carefully bring loose financial information into the accounting system.

GST Credits Can Help Cash Flow, But They Need Evidence

A GST credit can reduce the net GST amount payable through BAS.

That can be helpful for startups with early business costs. But GST credits should not be guessed from bank transactions.

The ATO explains that businesses can generally claim GST credits for GST included in the price of goods bought for business use, but the rules and supporting evidence must be met. You can read the official guidance here:  When you can claim a GST credit.

For startups, common GST credit questions can involve:

• software subscriptions
• laptops and equipment
• contractor invoices
• marketing costs
• legal fees
• accounting fees
• stock purchases
• website development
• business insurance
• fit-out costs
• payment processing fees
• office or coworking costs

The issue is not only whether money was spent.

• Was GST actually charged?
• Was there a valid tax invoice?
• Was the purchase for the business?
• Was there private use?
• Was the business registered for GST at the relevant time?
• Was the cost capital or revenue?
• Was the supplier Australian or overseas?

Some startup costs are easy to record incorrectly because the founder is moving quickly. A cleaner process from the start helps BAS and tax work go more smoothly later.

Do Not Build Pricing Without Thinking About GST

GST can affect pricing.

If your startup sells to consumers, adding GST later may make your price feel more expensive. If your price is already advertised as GST-inclusive, registering late may mean the GST is deducted from the amount you were already charging. If you sell to business customers, the pricing conversation may be different because those customers may be registered for GST themselves.

Founders often focus on market fit, competitor pricing, subscription tiers or project fees.

That is understandable.

But if GST is ignored when pricing is built, the startup may end up absorbing the cost later.

For example, a founder may charge $1,100 for a service, thinking the business has earned $1,100. If GST applies and the price is GST-inclusive, part of that amount may need to be reported as GST. That changes the real revenue picture.

Before setting prices, I like to understand:

• Who are the customers?
• Are they consumers or businesses?
• Is GST registration likely soon?
• Are prices GST-inclusive or GST-exclusive?
• Does the proposal or contract state this clearly?
• Will the software issue correct invoices?
• Will the founder know how much GST is being collected?

The tax setup should support the pricing model, not surprise it later.

Online Sales And Platform Income Need Careful Setup

Many Sydney startups operate online.

That may involve e-commerce stores, booking platforms, marketplace income, subscriptions, app revenue, digital products, payment processors, delivery platforms, affiliate income, online courses or software sales.

The bank account may show deposits, but not the full story.

A platform may deduct fees before paying the startup. Refunds may reduce deposits. Sales may be split across states or countries. Merchant fees may be hidden inside payout reports. GST may depend on the supply, customer and location. Some platforms may provide reports that require careful reconciliation.

If only the net bank deposit is recorded as sales, the startup may lose visibility over gross income, fees, refunds and GST.

For BAS and reporting, I usually want to know:

• What platform is being used?
• Are sales reported gross or net?
• Are fees separated?
• Are refunds recorded?
• Is GST being applied correctly?
• Are overseas customers involved?
• Are subscriptions or recurring payments being tracked?
• Do platform reports match accounting records?

Online sales can scale quickly. The bookkeeping setup should be strong enough to scale with them.

If the startup is already using Xero and the numbers do not feel right, my page on  Xero help in Sydney explains how I review the file behind the dashboard.

Contractors, Staff And PAYG Can Change The BAS Picture

A startup may begin with founders and contractors.

Then it may add casual staff, a part-time assistant, a developer, sales support, operations help or a first employee.

That changes the tax and accounting conversation.

Contractor payments need invoices and clear treatment. Employee wages need payroll records, PAYG withholding, superannuation, payslips and Single Touch Payroll reporting. PAYG withholding may also affect the BAS.

It is common for startups to move quickly and treat help casually, especially in the early stages. But the accounting file still needs to show what the arrangement was.

• Was the person a contractor or employee?
• Was an invoice issued?
• Was super considered?
• Was PAYG withholding required?
• Was the pay run processed properly?
• Were payroll liabilities recorded?
• Does the accounting file match the payroll reports?

This matters because payroll mistakes can become expensive later.

If hiring is close, my page on  payroll services in Sydney explains how I connect payroll records to bookkeeping, BAS and tax work.

Voluntary GST Registration Should Be Considered Carefully

A startup below the GST threshold may still choose to register voluntarily.

Sometimes that can make sense.

It may allow GST credits on business purchases. It may suit a business selling mainly to GST-registered business customers. It may prepare the business for expected growth.

But voluntary registration also creates obligations.

Once registered, the business must charge GST where required, issue proper tax invoices, lodge BAS and keep records to support GST claims. That can add administration before the business is ready.

This is not a decision to make solely because another founder did.

The right answer depends on the business model, expected revenue, customer type, startup costs, cash flow, pricing, record-keeping, and whether the founder can properly manage BAS obligations.

I usually ask whether the benefit of registering now outweighs the compliance work and cash flow impact.

The Startup Structure Affects GST And BAS Administration

A startup may operate as a sole trader, company, partnership or trust.

The structure affects how money is recorded, who owns the income, how founder costs are treated, how tax returns are prepared, and how GST registration is managed.

A sole trader may start simply, but the owner and business are closely connected. A company may provide a more formal structure, but company funds and founder funds need a clean separation. A partnership or co-founder arrangement may require careful record-keeping around ownership, expenses, and profit.

GST and BAS sit inside that structure.

If the wrong entity invoices the customer, pays the supplier or registers for GST, the records can become messy.

Before startup activity grows, I like to review:

• who owns the business
• who issues invoices
• which bank account receives money
• which entity is registered for GST
• who paid early costs
• whether founder loans exist
• whether there are co-founders
• whether a company may be needed
• whether business and personal spending are separated

If the structure is still undecided, my page on  accountants for startups in Sydney explains how I review structure, registrations and early records before the first year becomes harder to untangle.

BAS Should Not Be Left To The Founder’s Memory

A founder can remember a lot in the first month.

By month six, memory is usually not enough.

There may be multiple invoices, subscriptions, payments, software tools, contractors, platform statements, bank transfers, GST questions, founder reimbursements, Stripe or PayPal deposits, customer refunds and early asset purchases.

If the accounting file is not kept properly, BAS becomes a reconstruction exercise.

The founder starts asking:

• What was this payment for?
• Was GST included?
• Did I already claim this?
• Was that customer overseas?
• Was this a loan from me to the company?
• Did I pay this personally?
• Did the platform deduct fees?
• Did that refund reduce GST?

That is not a good system.

A startup should build a record habit early, even if the business is small.

The habit does not need to be complicated. It needs to be consistent.

A Practical GST And BAS Setup For A Sydney Startup

A startup’s first accounting setup should make the next few decisions easier.

It should show income clearly. It should capture expenses. It should separate business and private spending. It should show whether GST is being charged. It should support BAS if the business is registered. It should help the founder see the cash position.

A practical setup may include:

• a separate business bank account
• clear invoicing process
• GST registration review
• accounting software setup
• receipt and invoice capture
• proper chart of accounts
• sales tracking by channel where useful
• platform report reconciliation
• contractor invoice process
• payroll setup before staff are paid
• BAS calendar if registered
• monthly review of turnover
• regular bank reconciliation
• notes for founder payments

This gives the startup a cleaner foundation.

It also helps the founder answer investor, lender, grant, tax or ATO questions later.

What I Look At When A Startup Comes To Me

When a startup founder comes to me with GST or BAS questions, I want to understand the business model first.

• What are you selling?
• Who are the customers?
• How will you invoice?
• How much revenue do you expect?
• Are you close to the GST threshold?
• Are you selling online, through platforms or directly?
• Have you paid startup costs personally?
• Are there co-founders?
• Is the business a sole trader, company or something else?
• Are you using Xero, MYOB, QuickBooks or spreadsheets?
• Are contractors or employees involved?
• Have any invoices already been issued?
• Are there overseas customers or suppliers?

From there, I can help identify whether GST registration is needed, whether BAS will apply, what records should be kept and what needs to be fixed before the startup gets busier.

Rafal’s background in accounting and tax law helps me view startup GST and BAS in the context of the broader business position, not just as forms to lodge.

Common GST And BAS Mistakes Startups Make

A few startup mistakes appear often.

• Waiting too long to monitor GST turnover.
• Issuing invoices before deciding whether GST applies.
• Using personal bank accounts for business income and expenses.
• Recording platform deposits without separating fees.
• Claiming GST credits without tax invoices.
• Treating founder payments casually.
• Hiring help without properly setting up payroll.
• Using accounting software but not reconciling it.
• Lodging BAS from uncoded or poorly coded transactions.
• Forgetting that cash received may include GST.
• Not reviewing customer location or supply type.
• Leaving the first year to be cleaned up at tax time.

These mistakes are common because startups move fast. But speed does not remove tax obligations. It makes early setup more important.