How to Do Tax When You Sell Across Multiple Platforms in Australia

Every Platform Is a Separate Income Stream

When you sell on multiple platforms, each one generates its own income that must be declared to the ATO. Your eBay sales, Depop sales, Shopify sales, and Facebook Marketplace sales all count. You can't offset a loss on one platform against income from another unless they're all part of the same business — which for most resellers, they are.

The practical challenge is that each platform reports income differently, charges different fees, and provides different levels of transaction data. Consolidating all of this into a single, accurate picture of your business is the biggest accounting challenge multi-platform resellers face.

Different Fee Structures, Different Reports

eBay charges final value fees, promoted listing fees, and managed payments fees. Depop charges a flat selling fee plus payment processing. Shopify charges a subscription plus transaction fees. Each platform provides its own reporting format, and none of them talk to each other natively.

For your tax return, you need to show total gross income across all platforms, total deductible fees (broken down by category), and your net profit. Trying to do this manually with exports from each platform is where most resellers lose hours every month.

COGS Allocation Across Platforms

If you list an item on both eBay and Depop, and it sells on eBay, the COGS needs to be matched to the eBay sale. If you move an item from one platform to another, your records need to reflect that. Many resellers use a single inventory system that tracks each item regardless of which platform it's listed on, then allocates the COGS when the item sells on whichever platform closes the sale first.

Why Platform Exports Aren't Enough

Individual platform exports only show one piece of the puzzle. Your eBay export doesn't know about your Depop sales. Your Depop export doesn't include your eBay fees. And neither includes your Facebook Marketplace cash sales. To get a complete picture, you need a layer above the individual platforms that consolidates everything.

This is where reseller bookkeeping software becomes essential. Tools designed specifically for resellers can import data from multiple platforms, consolidate it, and produce the unified reports your accountant needs. Without this consolidation layer, you're either spending hours on manual reconciliation or risking inaccurate reporting to the ATO. See our guide to the best accounting software for resellers for options.