Ontario HST Guide

Ontario uses the Harmonized Sales Tax (HST) at 13%, combining 5% federal GST and 8% provincial component. It is a single VAT administered by the CRA. Ontario also offers point-of-sale HST rebates on children's items, books, and the New Housing Rebate for homebuyers.

Walk into a coffee shop on Bay Street, buy a used pickup in Oshawa, or license a SaaS seat for a Kitchener-Waterloo startup, and the same number follows every receipt: 13%. Ontario runs on the Harmonized Sales Tax, a single value-added tax that has applied to virtually every taxable sale in the province since July 1, 2010, when Queen's Park folded its old 8% Retail Sales Tax into the federal 5% GST to create one combined rate collected entirely by the Canada Revenue Agency.

That harmonization is the single most important fact about doing business in Ontario. There is no separate provincial sales tax return, no second registration, no second auditor. Businesses register once for an HST account, charge 13% on taxable sales, and recover the full 13% they pay on eligible inputs through Input Tax Credits — a stark contrast to the old PST regime, where the provincial 8% was a sunk cost baked into the price of everything a business bought.

Ontario also layers on two features that make it distinct from every other HST province: an unusually generous New Housing Rebate worth up to $24,000 for buyers of new construction, and a set of point-of-sale rebates that quietly knock the effective rate on books, children's clothing, diapers and a few other essentials back down to 5%. Add in a large financial sector concentrated in Toronto, an auto manufacturing corridor running through the Golden Horseshoe, and a booming tech scene from Toronto to Ottawa, and Ontario's HST rules touch a wider mix of industries than almost anywhere else in the country.

CRA standard frequencies. File HST return via CRA My Business Account.

CRA assigns GST/HST filing frequency based on your annual taxable sales. Enter your estimated annual taxable sales below to see your required filing frequency.

Before July 1, 2010, buying something in Ontario meant paying two separate taxes: 5% federal GST and 8% provincial Retail Sales Tax, tracked and remitted through two different systems. The PST portion was non-recoverable for businesses, which meant it silently compounded at every stage of a supply chain — a manufacturer paid PST on machinery, passed that cost into its price, and the next buyer down the chain paid tax on top of tax.

Harmonization replaced that with a single 13% HST — 5% federal plus 8% provincial — administered entirely through the CRA's GST/HST framework. From a compliance standpoint, HST behaves exactly like GST: one rate, one return, one account, and full recoverability of tax paid on business inputs. The only real reminder that Ontario's HST has a provincial component at all shows up in two places — the point-of-sale rebates and the New Housing Rebate — both of which specifically target the 8% provincial share.

For everyday commerce, the math is simple: multiply a pre-tax price by 1.13 to get the total, or divide a tax-included total by 1.13 to strip the tax back out. A $100 sale becomes $113 at checkout, with $13 flowing to the CRA as HST.

Because Ontario is a harmonized province, there is only one registration to worry about: a standard HST account with the CRA. There's no Ontario Ministry of Finance sales tax portal to sign up with separately — everything runs through the same federal system used for GST elsewhere in Canada.

Registration is mandatory once your total taxable revenue (including zero-rated sales) exceeds $30,000 CAD over any single calendar quarter or across four consecutive quarters. Below that, you're a 'small supplier' and registration is optional. A lot of Ontario freelancers and early-stage businesses register voluntarily anyway, mainly because it lets them start recovering the 13% HST they're already paying on rent, software, and equipment — money that otherwise just disappears into overhead.

The mechanics are straightforward: apply through CRA Business Registration Online (or by phone), which issues a Business Number if you don't already have one, then attaches an RT program account to it. That RT account is your single HST identifier — it's what appears on invoices, what you file returns against, and what the CRA references if a client ever wants to confirm you're a legitimate registrant.

• Mandatory once taxable revenue exceeds $30,000 over 4 consecutive quarters
• One registration covers both the federal and provincial portions — no separate Ontario account
• Apply through CRA Business Registration Online to get a Business Number + RT account
• Voluntary registration is common among small suppliers who want to claim ITCs
• Non-resident digital vendors face the same $30,000 threshold under the simplified regime

The CRA assigns your filing frequency based on annual taxable supplies, and it can change that assignment if your revenue crosses a threshold. Businesses under $1.5 million file annually, with the return due three months after their fiscal year-end (so a December 31 year-end business owes its return by March 31). Businesses between $1.5 million and $6 million file quarterly, one month after each quarter closes. Above $6 million, filing is monthly, again due one month after period-end.

Whatever the frequency, the actual mechanics of filing are identical across Ontario: submit through GST/HST NETFILE or CRA My Business Account, and pay through My Payment, online banking with pre-authorized debit, wire transfer, or in limited cases a cheque. Paper filing still technically exists but is discouraged and, for most registrants above the small-supplier threshold, no longer an option.

One detail that trips people up: even annual filers whose net tax owed exceeded $3,000 in the prior year are generally required to make quarterly instalment payments throughout the year, reconciled on the annual return. Missing an instalment doesn't erase the obligation — it just adds interest at the CRA's prescribed rate.

This is the part of HST that pre-2010 Ontario businesses would have killed for: every dollar of HST paid on an eligible business input — commercial rent, inventory, professional fees, equipment, software subscriptions, vehicle expenses used for business — is fully recoverable as an Input Tax Credit against the HST you collected from customers. There's no split calculation, no separate provincial recovery rules. If it's a legitimate business expense and you're a registrant making taxable supplies, the whole 13% comes back.

Take a concrete example: a Mississauga design agency bills a client $10,000 for a project and charges 13% HST, collecting $1,300. That same month, the agency pays $2,000 in commercial rent plus $260 in HST, and buys $1,500 in software licenses plus $195 in HST. Total ITCs claimed: $455. Net HST remitted to the CRA: $1,300 minus $455, or $845. Every dollar of that $455 would have simply been lost under the old PST system.

Documentation matters here. Invoices need to show the supplier's HST/Business Number, the date, the amount, and a description of what was purchased. For purchases under $100 including tax, the rules are relaxed and you don't need the supplier's BN on the receipt — useful for parking, small office supplies, and similar minor expenses.

Ontario is unusually generous with targeted relief, and it delivers that relief in two very different ways. The first is the point-of-sale rebate, which rebates the 8% provincial share right at checkout on a specific list of items: printed books, children's clothing and footwear, diapers, feminine hygiene products, and prepared food and beverages sold for $4.00 or less. On qualifying items, the customer only ever sees the 5% federal portion at the till — the retailer applies the rebate automatically and recovers the provincial share separately through its own HST return, so there's no rebate form for the shopper to fill out.

The second, and financially larger, piece is the Ontario New Housing Rebate. Buyers of newly constructed or substantially renovated homes can recover up to $24,000 of the provincial portion of HST paid on the purchase. It runs alongside — and is separate from — the federal GST New Housing Rebate, so a qualifying buyer can potentially claim both. Builders typically charge HST on the full purchase price and either credit the rebate directly at closing or leave it for the buyer to apply for afterward, depending on how the sale is structured.

Together, these two programs are the clearest expression of Ontario using its 8% provincial HST component as a policy lever — trimming the tax on family essentials at the register, and softening the cost of the province's expensive new-housing market.

• POS rebate: books, children's clothing/footwear, diapers, feminine hygiene products, prepared food/drinks $4 or less
• POS rebate applies at checkout automatically — no paperwork for the customer
• New Housing Rebate: up to $24,000 of the provincial HST portion on new or substantially renovated homes
• New Housing Rebate can stack with the separate federal GST New Housing Rebate
• Municipal Accommodation Tax (MAT), charged in cities like Toronto and Ottawa on hotel stays, is entirely separate from HST

Ontario follows the federal digital economy framework, but because it's the country's largest consumer market, these rules land here with more weight than almost anywhere else. A non-resident business with no physical presence in Canada that sells digital products or services — software, streaming subscriptions, apps, online courses — to Ontario consumers must register for HST once its sales to Canadian consumers pass $30,000 annually. That threshold is measured against total Canadian sales, not Ontario sales alone, so it's easy to cross without realizing it.

Online marketplaces and platform operators are deemed the vendor under these rules. If a non-resident seller lists goods or services through a qualifying platform, it's the platform — not the underlying seller — that's on the hook to register, collect, and remit HST on those facilitated sales to Ontario customers. Enforcement of this piece tightened further through 2025, with the CRA paying closer attention to non-resident vendors that had assumed they were outside the system.

For place-of-supply purposes, what matters is where the customer is located, not where the seller ships from. A Vancouver company shipping to a customer with an Ontario billing address generally charges 13% HST on that sale rather than BC's combined rate — interprovincial sales follow the destination, and getting that wrong is one of the more common cross-border compliance mistakes.

These official resources provide authoritative information on sales tax rules, registration, and compliance in Ontario.