GST / HST Calculator

Reviewed by EverStone CPA · July 2026

Quick answer: Add or back out GST/HST for any Canadian province in one tap. Handy for invoices, quotes and quick checks. Built by EverStone CPA in Abbotsford, BC.

Amount (CAD) Province / territory Mode

$50.00

GST at 5% — total $1,050.00

BC, Saskatchewan, Manitoba and Quebec also charge a separate provincial sales tax (PST/RST/QST) not shown here. This tool covers federal GST/HST only. Estimate for convenience — not tax advice.

What this calculator answers

How much GST or HST is in this amount — or how much do I add to it?

Anyone invoicing, checking a supplier bill, or backing tax out of a total that was quoted tax-included. It cannot tell you whether the supply is taxable in the first place, which is the question that actually goes wrong.

A worked example

These are the numbers already in the calculator above, so you can follow the arithmetic against the result it is showing.

The values the page loads with: $1,000 at the 5% GST rate
Step	Figure
Adding tax to $1,000	$1,000 × 5% = $50.00 tax, $1,050.00 total
Extracting tax from $1,000	$1,000 ÷ 1.05 = $952.38 before tax, $47.62 tax
Why they differ	The second treats the $1,000 as already including tax. Applying 5% to a tax-included total over-states the tax.

What it assumes, and where it stops

Every estimate rests on assumptions. These are the ones that would change your number most.

Where this estimate stops being reliable
Assumption	What it means for your number
The supply is taxable at the selected rate	Zero-rated supplies carry 0% but still allow input tax credits; exempt supplies carry no tax and allow none. The difference matters more than the arithmetic.
The province is the place of supply	The rate follows place-of-supply rules, not where your business is. A BC firm can be required to charge 13% on an Ontario supply.
BC PST is not included	PST is a separate provincial tax with its own registration and return, and it is not an input tax credit.

General information, not advice. Have a CPA confirm it for your situation

How GST/HST works

A GST/HST calculator converts between an amount and a rate, but it cannot account for input tax credits, the Quick Method, the separate provincial taxes charged in BC, Saskatchewan, Manitoba and Quebec, whether a supply is zero-rated or exempt, or whether the place-of-supply rules point to the rate that was selected — A rate converter, not a remittance figure.

Understanding GST/HST in Canada

GST/HST is a tax on most goods and services in Canada. The rate you charge follows the place of supply — where your customer is: 5% GST in Alberta and the territories, 13% HST in Ontario, 15% HST in the Atlantic provinces (14% in Nova Scotia since 2025), and 5% GST plus a separate provincial tax in BC, Saskatchewan and Manitoba.

Once your taxable sales pass $30,000 over four rolling quarters you must register, charge and remit GST/HST. The upside: you can then claim input tax credits for the GST/HST you paid on business expenses, which often means a smaller remittance — or a refund. Use the calculator above to add or remove tax for any province, then talk to us about registration and filing.

This calculator gives a general estimate for information only — not tax advice specific to your situation. Rates and rules change, and your result depends on details it can’t capture. We confirm the numbers for your circumstances in a free consult.

Questions

Good to know

Do I need to charge GST/HST as a contractor or small business?+

Once your taxable revenue passes $30,000 over four consecutive quarters you must register for GST/HST and charge it. Many businesses register earlier to claim input tax credits. We handle registration and filing for you.

What is the difference between GST, HST and PST?+

GST is the 5% federal tax. In HST provinces (Ontario and the Atlantic provinces) the federal and provincial portions are combined into one tax. BC, Saskatchewan, Manitoba and Quebec keep a separate provincial sales tax (PST, RST or QST) on top of the 5% GST.

How do I read the result this calculator gives me?+

The result splits an amount into the tax portion and the total, using the rate for the province you pick. If you entered a price that already includes tax, the tax shown is the amount buried inside it, not an amount to add on top. Use the tax-included view when you are backing GST out of a receipt, and the tax-excluded view when you are quoting a client.

What does this calculator not account for?+

It does not account for input tax credits, the Quick Method, PST or RST that may apply on top of GST, or whether a particular sale is zero-rated or exempt. It also assumes the rate matches where the supply is considered to be made. Those factors change what you actually remit, so treat this as a rate converter, not a filing figure.

Which rate applies if my client is in a different province than I am?+

Generally the rate follows where the supply is considered to be made, which for most goods and many services is the customer’s province, not yours. That is why an Abbotsford business invoicing an Ontario client often charges HST rather than GST. Place-of-supply rules differ by what you sell, so confirm the category before you set your invoice template.

Does this tell me how much GST/HST I owe CRA?+

No. What you remit is the tax you collected minus the input tax credits you are entitled to claim on business purchases, and this calculator only handles the collected side. Two businesses with identical sales can owe very different amounts once ITCs are applied. Build your remittance from your books for the period, not from a single transaction.

When should I have my GST/HST numbers checked?+

Get a second look before your first filing, after any change in what you sell or where you sell it, and any time CRA questions a return. Registration timing, ITC eligibility and zero-rated versus exempt treatment are the three places small businesses most often go wrong. Book a free consult and you will get a fixed quote in writing before any work starts.

Free tools & guides

More free tools for GST-registered owners

Worked out the tax on a sale? These answer the questions owners usually ask next.

CalculatorShould I incorporate?See what incorporating could save once your revenue picks up.CalculatorSalary vs. dividendsOnce GST is sorted — how should the company pay you?GuideSole proprietor vs. corporationRegistered for GST as a sole prop? When incorporating starts to pay.HubAll free toolsEvery EverStone calculator and guide in one place.

Sources

The rates and thresholds behind this page. Rates change — check the source before relying on a figure.

General information, not advice. Have a CPA confirm it for your situation

Want the exact numbers for your situation?

These tools are a starting point. Book a free consult and we’ll run your real figures — and give you a fixed quote to handle it all.

Book a Free Consult Call (604) 832-1743

Knowing the amount is half of it. When you have to file and remit it depends on your filing frequency.