For Canadian Resellers, Flippers & Marketplace Sellers
NorthOS is built for Canadian resellers who need per-item cost basis, T2125-ready COGS, and a $30K GST threshold tracker — without paying for warehouse software built for someone else.
eBay shows you gross sales. Amazon shows you settlement totals. Neither subtracts what you paid for the item, what the platform took in fees, or what shipping cost you. By the time you reconcile it all, the next sale has already shipped.
An item bought at a thrift store in February sells in October. Without a cost basis recorded at purchase, you're guessing — and your COGS line on the T2125 is a guess too. NorthOS locks the cost basis to the item the moment you log it.
CRA's registration threshold is based on gross sales — not profit. A reseller doing $35K in revenue at 20% margin is over the threshold even if take-home is $7K. Cross it without registering and you back-pay GST you never collected.
Lines 8300, 8320, 8500, 8518: opening inventory, purchases, closing inventory, and cost of goods sold. Most general-purpose accounting tools dump everything into “expenses,” which is wrong for resellers. NorthOS routes inventory purchases to the right CRA lines so your T2125 actually reflects how reselling works.
A spreadsheet for what you bought. Photos on your phone of receipts. A running tab in your head of what's active versus sold. Tax season turns into a forensic exercise. NorthOS puts every item in one screen with status, cost basis, source, and platform.
Log every item with name, source, supplier, unit cost, quantity, target price, and platform. The cost basis stays with that item all the way through to the sale — no guessing what you paid in February for something that sells in October.
Tag every item by source (thrift, wholesale, liquidation, retail or online arbitrage) and platform (eBay, Amazon, Mercari, Etsy). The dashboard shows profit broken out by source so you can see which sourcing strategy is actually working.
Mark an item sold, enter the sold price, and NorthOS records the profit (sold price − cost basis) on the spot. Platform fees and shipping flow into your expense ledger so the full picture appears on your T2125, not just the line-item margin.
Buy 10 of something and sell 3? NorthOS splits the record: 7 stay active with the original cost basis, and a new sold record gets created for the 3 with the profit calculated. Both halves preserve the audit trail.
Lines 8320 (Purchases) and 8500 (Closing Inventory) populate from your inventory automatically. When you close your fiscal year, NorthOS snapshots active inventory as the closing balance and rolls it forward as next year's opening (Line 8300). No manual entry after year one.
Your running gross-sales total updates every time you log income. NorthOS flags you when you're approaching the $30K GST registration threshold — before you cross it and before back-paying GST you never collected becomes a problem.
After inventory costs, fees, shipping, and your tax reserve, NorthOS shows you one number: what you can actually spend right now without coming up short next April.
Photograph a thrift-store receipt, log the haul, and the items move into inventory with the cost basis attached. Every transaction lands in your ledger mapped to the correct T2125 line.
Three steps from sourcing trip to tax filing.
Eight onboarding questions, Product Seller profile configured automatically. Takes about three minutes.
Source, supplier, unit cost, quantity, target price, platform — all on one screen. When something sells, mark sold, enter the sold price, and NorthOS does the profit calculation.
Download your T2125 export with Lines 8300 / 8320 / 8500 / 8518 already populated. Hand it to your accountant and stop scrambling through receipts in April.
“I built NorthOS because I was reselling and had no idea what I was actually making. Platform dashboards showed me gross sales. My spreadsheet was a mess. And at tax time I had no idea how to handle cost of goods sold on my T2125. NorthOS is the tool I needed and couldn't find.”
— Nik, Founder
“I crossed the GST threshold without realizing it last year and had to back-pay. NorthOS would have flagged me months earlier — that alone is worth the subscription.”
eBay Reseller, Ontario
“My T2125 used to be a nightmare. I'd have a year of receipts and no idea what was COGS versus regular expenses. Now my accountant gets a clean export with the right lines populated.”
Thrift Flipper, British Columbia
Plenty of resellers also freelance, drive, or run a second shop. CRA wants a separate T2125 behind each business, but it counts the $30,000 GST/HST threshold across all of them together, because you register as a person rather than once per business. NorthOS keeps each business in its own set of books under one login and tracks the combined threshold for you.
See how multi-business accounts workWorks alongside your accountant — not instead of one.
Goods are taxed where they are delivered, so the buyer's province sets the rate, not yours. Ship across the country and you charge the rate at the far end.
Ontario
In Ontario the GST/HST on a taxable sale is 13% HST, and the return is filed with the CRA.
When you have to register
You stop being a small supplier once taxable revenue passes $30,000 in a single calendar quarter, or across the last four consecutive quarters. The single-quarter test catches people out, because the CRA wants tax on the very sale that took you over.
Rates come from the same canonical CRA tables the NorthOS filing math uses. , or read the CRA's General Information for GST/HST Registrants (RC4022).
For Ontario resellers
Get your books CRA-ready and know your real profit on every sale.
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