Do You Pay Tax Selling on Facebook Marketplace in Australia?

The ATO Can See Your Sales

Many Facebook Marketplace sellers assume that because transactions happen privately — often via cash or bank transfer — the ATO can't track them. This is a dangerous misconception. The ATO's data matching program collects information from banks, payment platforms, and increasingly from social media marketplace data. Regular deposits into your bank account that don't match your declared income are a red flag.

The ATO has publicly stated it uses sophisticated analytics to identify patterns consistent with undeclared business income. Large or frequent deposits, particularly from multiple sources, can trigger automated matching notices. For more on how the ATO monitors online sellers, see our guide on reseller tax in Australia.

When Marketplace Sales Become Taxable

Selling your old couch or a used phone is not taxable — that's disposing of a personal asset. But when you buy items with the intention of flipping them for profit on Facebook Marketplace, that's a business activity. The ATO uses the "pattern of sales test": are you regularly buying and selling? Is there an intent to profit? Are you operating in a commercial manner?

If you answer yes to these questions — even if you're only doing it on weekends — you have tax obligations. This includes declaring the income and potentially registering for an ABN.

Record Keeping Without a Platform Export

Unlike eBay or Depop, Facebook Marketplace doesn't provide transaction reports or sales summaries. This makes record keeping your responsibility. You should maintain records of every sale including the date, item description, sale price, buyer details if available, and how payment was received.

For cash sales, a simple log in a spreadsheet or notebook is acceptable to the ATO — but you need to be consistent and honest. Keeping screenshots of listings and conversations can also serve as supporting evidence if the ATO ever queries your records.

What Happens If You Don't Declare

The penalties for not declaring business income range from interest on unpaid tax to significant fines. In serious cases of deliberate avoidance, criminal prosecution is possible. The ATO often takes a softer approach with first-time offenders who voluntarily disclose, but waiting until they contact you removes much of that goodwill.

If you've been selling on Facebook Marketplace without declaring income, the best course of action is to speak with a tax professional about a voluntary disclosure. The earlier you fix it, the lower the penalties. For tips on tracking sales across platforms, visit our reseller bookkeeping guide.