How to Invoice for Cash Jobs in Australia (ATO Record-Keeping)

Q: Do I need to invoice for cash jobs in Australia?

Yes — the ATO requires you to keep a record of every business transaction regardless of how it was paid. Cash, bank transfer, card, or crypto, you need a record. The record can be an invoice, a receipt, or a contemporaneous note, but it must exist.

Q: What’s the difference between an invoice and a receipt for cash?

An invoice is a request for payment issued before or at the time of the work. A receipt acknowledges payment that has already been made. For cash jobs where the client pays on the spot, many businesses issue a single document that combines both — essentially a paid invoice or a tax receipt.

Q: Does a cash invoice need GST?

Only if you’re GST-registered (turnover $75,000+). The payment method doesn’t change the GST treatment. Cash sales are still taxable supplies and must show the GST line on the invoice.

Q: Can I just write a cash receipt on paper?

Yes — handwritten receipts are still legal in Australia as long as they show your business name, ABN, date, description of the work, amount, and the words “Tax Invoice” and GST if you’re GST-registered. Digital is easier to keep for 5 years; paper receipts often fade or get lost.

Q: What are the risks of not invoicing for cash jobs?

Three risks: ATO penalties for under-reporting income (up to 75% of the underpaid tax), the buyer can’t claim a GST credit and is unlikely to use you again, and you have no defence if a dispute arises about whether the work was done or paid for.

Quick answer

Cash jobs need an invoice or receipt for ATO record-keeping — the same rules apply as for bank-transfer or card payments. Issue a single document showing your business name, ABN, date, invoice number, description of the work, total, GST line if you’re registered, and a note that payment was received in cash. Keep a copy for 5 years. Skipping documentation is one of the fastest ways to get on the ATO’s radar.

The ATO record-keeping rule

Australian tax law requires a business to keep records of every transaction — income and expenses — for at least 5 years. The rule doesn’t change based on payment method. A cash sale is just as countable as a bank-transfer sale, and the record-keeping obligation is identical.

For a tradie, mobile cleaner, market stall, hairdresser, or anyone else who takes cash regularly, that means producing a receipt or invoice for every cash payment received. Full retention rules in how long to keep invoices in Australia.

Cash invoice vs. cash receipt

Two slightly different documents for the same transaction:

Invoice — a request for payment issued before or at the time of the work. Has a due date.
Receipt — an acknowledgment that payment has been received. Issued after the payment.

For a cash job where the client pays you on the spot, you can issue a single document that functions as both: an invoice marked “Paid in full — cash” with the date of payment. The ATO is happy with this; it’s what most service businesses do.

The simple cash invoice / receipt template

A worked example for a $440 cash job (GST-registered):

TAX INVOICE — PAID
INV-0073 — 4 June 2026

From:  Acme Mobile Service
       ABN 12 345 678 901
       acme@acmemobile.com.au

To:    [Customer name or “Cash sale” for walk-ins]

———————————————————————————————————————————————————————————
Service call — [description, time, parts]      $400.00
———————————————————————————————————————————————————————————

Subtotal:                                       $400.00
GST (10%):                                      $ 40.00
Total (AUD):                                    $440.00

Payment received: Cash, 4 June 2026.

Thank you for your business.

This single document is invoice, receipt, and audit-trail entry. It satisfies ATO record-keeping, gives the customer something to file, and protects you from disputes.

If you’re not GST-registered

Same structure, with these differences:

Title is “Invoice” (or “Receipt”), not “Tax Invoice”.
No GST line.
Add: “No GST has been charged. This business is not registered for GST.”

The non-GST cash receipt is otherwise identical. See how to invoice without GST for the full non-GST template wording.

Walk-in / unnamed customers

For a retail-style cash sale where you don’t take the customer’s details, two things change:

The buyer field reads “Cash sale” or “Walk-in customer” (rather than a name).
For sales under $82.50 (GST-inclusive), you’re not legally required to issue a tax invoice. You can issue a basic receipt with just the date, total, and your business name. Above $82.50 a tax invoice is required if the buyer asks for one within 28 days.

For invoices over $1,000, the buyer’s identity or ABN must appear on the document — meaning you need their name. See tax invoices over $1,000.

The cash-in-hand temptation (and why it’s expensive)

The cash economy in Australia is one of the ATO’s priorities. The three concrete risks:

Audit penalties. Under-reporting income carries penalties of 25–75% of the underpaid tax on top of the tax itself, plus interest. For an unreported $20,000 of cash income, the all-in cost can run to $15,000+.
Industry benchmarks. The ATO publishes industry benchmarks — average sales, expenses, and profit margins by industry. If your reported income is significantly below the benchmark for your trade, you go on a list for review.
Customer disputes. Without a receipt or invoice, you have no defence if a customer later denies that work was done or that they paid. The customer’s word against yours, with no documentation.

How banks and the ATO see cash

When you deposit cash into a business account, banks report large or unusual deposits to AUSTRAC. Cash deposits over $10,000 are auto-reported by every bank in Australia. The ATO cross-references reported income with bank deposits as part of routine compliance, and mismatches trigger reviews.

The honest path: take the cash, issue the receipt, deposit it into your business account, report it as income. The savings from skipping documentation are tiny compared to the downside if it’s detected.

Bookkeeping cash properly

For a sole trader who takes cash a few times a week, the system that works:

Issue an invoice or receipt for every cash transaction at the time of payment, with a sequential invoice number that fits your normal numbering.
Deposit the cash into your business bank account weekly. The deposit slip becomes part of your audit trail.
Reconcile the deposits against the receipts at month-end — total of receipts = total cash deposited.
Report the cash income on your BAS (if GST-registered) and tax return. See how to prepare for BAS.

Mobile cash invoicing

For tradies, mobile cleaners, hairdressers, and on-site service businesses, the cash receipt usually has to happen on the spot — in the customer’s driveway or living room. A mobile-first invoicing app means you tap out the receipt on your phone, email or text it to the customer, and have it stored automatically. No carbon-copy receipt books, no “I’ll send it later” (which means you never do).

How Free Invoice App handles cash

Free Invoice App is mobile-first. Create a tax invoice on your phone in 30 seconds, mark it as “Paid — cash” with the date received, and text or email the PDF to the customer on the spot. The invoice goes into your records automatically, ready for the ATO’s 5-year retention rule. The Free plan covers 7 sends a month at no cost. Get started free.

Frequently asked questions

Do I need to invoice for cash jobs in Australia?

Yes — the ATO requires a record of every business transaction regardless of payment method.

What’s the difference between an invoice and a receipt for cash?

Invoice = request for payment. Receipt = acknowledgment of payment. For on-the-spot cash jobs, a single document marked “Paid in cash” covers both.

Does a cash invoice need GST?

Only if you’re GST-registered (turnover $75k+). The payment method doesn’t change the GST treatment.

Can I just write a cash receipt on paper?

Yes — handwritten is legal, but digital is easier to retain for the ATO’s 5-year rule.

What are the risks of not invoicing for cash jobs?

ATO penalties (25–75% on top of the unpaid tax), industry-benchmark flags, and no defence in customer disputes.