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Gas station tax services: pump taxes passed through, lottery done right, one clean T2
A gas station's tax return looks nothing like its bank account. Millions of dollars of fuel flow through the pumps, most of the tax in the pump price was never yours to remit, and the lottery terminal settles money that was never your revenue. We prepare T2s that separate agency money from real income, HST filings that reconcile in litres, and the documentation that answers a fuel-volume audit before it starts.
By the AnalytIQ Accounting team · Last reviewed: August 12, 2026
The taxes in the pump price were never yours
Most of the tax a customer pays at the pump is not the station's to remit. The federal excise tax — 10 cents per litre on gasoline, 4 cents on diesel — and Ontario's gasoline tax of 9 cents per litre are levied upstream, on refiners, importers, and wholesalers, and arrive buried inside your delivered fuel cost. You never file a return for them. What you do remit is HST, and it is calculated on the full pump price including those embedded taxes: tax on tax, by design. The stack got shorter when the federal fuel charge dropped to zero on April 1, 2025, but the mechanics did not change — whatever sits inside the posted price, HST rides on top of all of it.
That distinction shapes the whole engagement. Fuel revenue is enormous relative to fuel profit, so a small HST mapping error moves more money than a bad quarter. We tie every GST34 filing to supplier invoices in both litres and dollars, capture the input tax credits on the HST your supplier charges, and keep the excise and provincial components where they belong — in cost of goods sold, not in a tax account.
Lottery money is not your revenue — the commission is
When you sell an OLG ticket, you sell as agent. The ticket's face value is not your sale, prize redemptions are not your expense, and the weekly terminal settlement is not a supplier bill. Only the commission OLG pays lands on the T2 as income. The Excise Tax Act deems a retailer's ticket-selling service to a provincial lottery corporation not to be a supply at all, which means no HST applies to lottery commissions — though income tax certainly does.
The same agency lens applies elsewhere on the counter. ATM surcharge income is an exempt financial service: no HST, still reportable income. Booking gross lottery receipts into sales is the error we unwind most often on new files — it overstates revenue, breaks the HST reconciliation, and makes the store's margins look implausible in both directions at once.
One register, four tax treatments
The convenience side sells through a single till at several different rates, and CRA expects your POS departments to prove which was which.
| Sold at the counter | How it is taxed |
|---|---|
| Fuel at the pump | 13% HST on the excise-included price — you remit it |
| Chips, pop, energy drinks | 13% — snack foods are always taxable |
| Milk, bread, eggs | 0% — zero-rated basic groceries |
| Cigarettes | 13% HST on a price that already includes tobacco tax |
| Lottery tickets | OLG's sale, not yours — your commission carries no HST |
| Car wash, air, propane exchange | 13% — taxable services and goods |
We audit the department mapping when we take a station on, because every misfiled SKU repeats its error hundreds of times a week. The findings feed straight into the monthly close we describe on our gas station bookkeeping page.
Litres make you an easy audit
CRA can get your fuel volumes without asking you. Purchases in litres are third-party data from your supplier, and dividing reported fuel sales by posted street prices tells an auditor roughly how many litres you claim to have sold. If bought and sold litres do not reconcile — after shrink, temperature variance, and own-use fuel — the working theory becomes suppressed cash sales, and the c-store gets a markup test next. The defence is routine, not heroics: daily pump totalizer readings tied to till closes, deposits matched to shift reports, and shrink logged when it happens rather than estimated under audit.
The T2, and the second station
An incorporated station earns the small business deduction, taxing the first $500,000 of active profit at Ontario's combined low rate. The catch arrives with growth: hold each site in its own corporation under common ownership and the companies are associated, sharing a single $500,000 limit rather than stacking new ones. We plan year-ends, instalments, and owner compensation across the group, not per site. We also time major capital work against income — canopy rebuilds, tank replacements, dispenser upgrades — because projects that size are big enough to move a year's tax bill on their own. There is a cross-border thread in this niche too — some owner-operators are US citizens filing in both countries, and multi-entity station groups sometimes touch US suppliers or US owners. We deal with those files on our gas station cross-border tax page.
Source: Ontario — Gasoline Tax.
Common questions.
Do I remit the excise tax collected at the pump?
No. Federal excise tax and Ontario gasoline tax are levied upstream and are already inside your delivered fuel cost. Your only remittance is HST, which is calculated on the full pump price including those embedded taxes.
Is my lottery commission subject to HST?
No. The Excise Tax Act deems a retailer's ticket-selling service to a provincial lottery corporation not to be a supply, so commissions carry no HST — but they are still taxable income that must be reported on the T2.
Why do CRA auditors focus on litres instead of dollars?
Because your supplier's volume data is independent of your books. An auditor compares litres purchased against the litres implied by reported sales and posted prices; an unexplained gap suggests unreported sales, so totalizer readings and shrink logs are your defence.
Related reading
Margins measured in cents deserve exact tax.
Book a consultation and get a plain answer on exactly what applies to you.