To invoice clients properly as an Australian freelancer, put your ABN on every invoice, label it a "Tax Invoice" only if you're GST-registered, set short payment terms (Net 7 or Net 14), and send it the moment the work is delivered. Get those four things right and you'll be paid faster, look more professional, and stay on the right side of the ATO. Below are ten practical tips, written for Australian sole traders and freelancers, covering ABN rules, the GST threshold, payment terms, chasing overdue invoices, and choosing software.
As a freelancer, your invoicing process is your cash flow engine. It doesn't matter how talented you are or how much work you book — if your invoicing is sloppy, late, or confusing, you'll spend your time chasing money instead of doing the work you love.
Good invoicing isn't just about getting paid. It's about looking professional, meeting your tax obligations, and building a sustainable freelance business. Here are ten tips that will make a real difference.
If you have an Australian Business Number (ABN), it must appear on every invoice. This isn't just best practice — it's a legal requirement under certain circumstances, and omitting it has real financial consequences.
If you provide a service to a business and don't quote your ABN, they are legally required to withhold 47% of your payment and send it to the ATO under the "no ABN withholding" rule. You'll get this money back when you lodge your tax return, but in the meantime, you're out almost half your income.
Action: Put your ABN in your invoice template header so it appears on every invoice automatically. You can generate a compliant invoice with your ABN pre-filled using the free OneBookPlus invoice generator.
If your annual freelance turnover is $75,000 or more, you must register for GST and charge 10% on your services. If you're under the threshold, you can choose to voluntarily register or not. (The threshold has sat at $75,000 since 2007 and is unchanged for FY2025-26.)
If you're GST-registered:
Your invoices must be tax invoices (labelled as such)
You must show the GST amount separately or state the total includes GST
You charge 10% GST on top of your fees
You can claim GST credits on business purchases
If you're not GST-registered:
Your invoices should not show GST or use the words "Tax Invoice"
Action: Know where you stand on the $75,000 threshold and set up your invoicing accordingly. The test is rolling — it applies if your turnover hits $75k in the current month plus the previous 11, or you reasonably expect it to over the next 12 months. If you're approaching the threshold, register for GST before you cross it, not after, and you have 21 days to register once you're required to.
Payment terms tell your client when you expect to be paid. Common terms for Australian freelancers:
Due on receipt — payment expected immediately
Net 7 — payment due within 7 days
Net 14 — payment due within 14 days
Net 30 — payment due within 30 days
The shorter your payment terms, the faster you get paid. Many freelancers default to Net 30 because it seems standard, but there's no law requiring it. If you're a sole trader with bills to pay, Net 7 or Net 14 is perfectly reasonable.
If a client habitually pays late, you can also charge interest on overdue amounts — provided it's stated in your terms. Work out a fair figure with the free late payment interest calculator before you put a rate on your invoice.
Action: Choose your payment terms and state them clearly on every invoice. Put them near the top, not buried in fine print.
The number one reason freelancers get paid late is that they invoice late. If you finish a project on Friday and don't send the invoice until the following Wednesday, you've already lost five days.
Invoice the same day you deliver the work, or the next business day at the latest. The closer the invoice is to the delivery, the stronger the psychological connection between the work and the payment.
For ongoing work (retainers, monthly projects), set a fixed invoicing day — for example, every first Monday of the month — and stick to it without exception.
Action: Set a rule for yourself: work is not "done" until the invoice is sent.
Your invoice is a business document that represents your brand. A clean, well-designed invoice communicates professionalism and makes clients more likely to pay promptly.
A professional freelancer invoice should include:
Your business name and logo
Your ABN
"Tax Invoice" label (if GST-registered)
Unique invoice number (sequential: INV-001, INV-002, etc.)
Date issued
Client's name and business details
Clear description of work performed
Quantity, rate, and line totals
GST breakdown (if applicable)
Total amount due
Payment terms and due date
Your bank details or payment link
Action: Create a template once and reuse it. Don't start from scratch every time.
The ATO expects your invoices to be numbered in a logical sequence. This helps with record-keeping and makes it easy to spot missing invoices during an audit. You also need to keep your invoices and business records for five years.
Use a simple system: INV-001, INV-002, INV-003 — or a date-based prefix like 2026-001, 2026-002. Whatever system you choose, stick with it.
Action: Never reuse an invoice number. If you cancel an invoice, mark it as cancelled and move to the next number.
Vague invoice descriptions lead to payment delays. "Consulting services — $2,000" tells the client nothing. Compare that with:
"Brand strategy workshop — 3 hours at $200/hr: $600"
"Logo design — 2 concepts with 3 rounds of revisions: $1,400"
Clear descriptions reduce disputes, speed up approvals (especially in larger companies where someone other than your contact processes payments), and create a useful record for both parties.
Action: Write descriptions that would make sense to someone who wasn't involved in the project.
Chasing money is uncomfortable, but silence is expensive. If an invoice is overdue:
Day 1 past due: Send a polite reminder. "Hi [Name], just a friendly reminder that invoice #INV-042 was due yesterday. Happy to resend if needed."
Day 7 past due: Follow up more directly. "I'm following up on invoice #INV-042, which is now 7 days overdue. Could you confirm when I can expect payment?"
Day 14 past due: Escalate. "Invoice #INV-042 is now 14 days overdue. I'd appreciate payment within the next 3 business days. Please let me know if there's an issue."
Day 30+ past due: Consider pausing further work for this client until the balance is cleared, and mention this in your communication.
Most overdue invoices are the result of oversight, not malice. A simple reminder usually resolves it.
Action: Set up automated payment reminders in your invoicing software. Don't rely on memory.
Invoicing is only half the financial picture. As a freelancer, you also need to track business expenses — and you should be doing this throughout the year, not in a panic at tax time.
Deductible expenses for freelancers commonly include:
Home office costs (a proportion of rent, electricity, internet)
Equipment (laptop, phone, peripherals)
Professional development (courses, conferences, books)
Marketing costs (website hosting, business cards, advertising)
Insurance (professional indemnity, public liability)
Travel for work purposes — if you claim car costs, the ATO cents-per-kilometre rate is 88 cents/km for FY2025-26 (up to 5,000 business km)
Assets you buy for the business may also be immediately deductible under the $20,000 instant asset write-off (for assets first used or installed ready for use by 30 June 2026, subject to legislation — always check the current year's rule before relying on it).
Action: Log every business expense as it occurs. Use an app that lets you photograph receipts — paper receipts fade and get lost.
Spreadsheets work when you have three clients and ten invoices a year. Beyond that, you need proper invoicing and accounting software. The benefits are significant:
Professional invoices generated in seconds
Automatic GST calculations so you never get the maths wrong
Payment tracking — see at a glance who has paid and who hasn't
Expense logging with receipt capture
Financial reports — profit and loss, revenue by client, outstanding invoices
BAS preparation — your GST figures are ready when BAS time comes
Tax time simplicity — hand your accountant a clean set of records instead of a shoebox
The cost of accounting software is a tax-deductible business expense. The time it saves you is worth far more than the subscription.
OneBookPlus was built for exactly this — Australian freelancers and sole traders who need professional invoicing without the complexity of enterprise accounting software. It's an all-in-one, Australian-built platform (hosted in AWS Sydney) that handles invoicing, quotes, bookings, jobs, a client CRM and accounting in one place, so you're not stitching three tools together.
With OneBookPlus, you get:
Professional invoice templates with your logo, ABN, and GST handling built in
Create a tax invoice that includes your business name, ABN, a unique sequential invoice number, the date, a clear description of the work, the amount due (with GST shown separately if you're registered), your payment terms, and how to pay. Send it the day you deliver the work and keep a copy for five years. A free tool like the OneBookPlus invoice generator produces a compliant invoice in minutes.
Only if your annual turnover is $75,000 or more — then GST registration is mandatory and you charge 10% on your services. Below $75,000 it's optional. If you're not registered, don't show GST or label your document a "Tax Invoice".
Yes, provided you state the interest rate (and any late fee) in your terms before the work starts or on the invoice itself. Keep the rate reasonable. Use the late payment interest calculator to work out a fair figure.
Your invoicing process should be the easiest part of freelancing — not the most frustrating. OneBookPlus gives Australian freelancers professional invoicing, expense tracking, and GST reporting on a free plan. Try the free invoice generator now, or start your free account and invoice like a professional from day one.
