hst calculator canada

What is HST in Canada?

HST stands for Harmonized Sales Tax. It combines the federal GST (Goods and Services Tax) and the provincial sales tax into one single rate in participating provinces. If you run a business, create invoices, or simply want to check if a receipt is correct, an HST calculator helps you get accurate numbers in seconds.

In practical terms, you usually need one of two calculations:

• Add tax to a pre-tax amount (for quotes and invoices).
• Remove tax from a tax-included amount (for bookkeeping and back-calculations).

Current HST/GST rates commonly used

Note: This page is designed as an HST/GST quick calculator. Some provinces use additional provincial sales taxes that may need separate treatment depending on your accounting context.

How to use this HST calculator

1) Enter your amount

Type the amount in Canadian dollars. You can use decimals (for example, 49.99).

2) Choose your province or tax rate

Select the province list option that matches your transaction. If needed, choose Custom Rate and enter any tax percentage.

3) Pick calculation type

• Add tax to subtotal if your amount is before tax.
• Remove tax from total if your amount already includes tax.

4) Click Calculate

The tool instantly shows subtotal, tax amount, and final total with clear rounding to two decimals.

HST formulas (simple and useful)

Adding tax

Tax Amount = Subtotal × Tax Rate
Total = Subtotal + Tax Amount

Removing tax from a total

Subtotal = Total ÷ (1 + Tax Rate)
Tax Amount = Total − Subtotal

Examples

Example A: Ontario 13% (add tax)

If your subtotal is $100.00, tax is $13.00 and total is $113.00.

Example B: Nova Scotia 15% (add tax)

If your subtotal is $250.00, tax is $37.50 and total is $287.50.

Example C: Remove 13% HST from a total

If your total receipt is $113.00 including HST, the pre-tax subtotal is $100.00 and tax portion is $13.00.

Tips for businesses and freelancers

• Use consistent rounding rules (typically 2 decimal places) in your invoices and bookkeeping.
• Keep your province/rate selection accurate for each transaction location.
• When reconciling sales, remove tax from gross deposits to identify true revenue.
• Review tax rates periodically to ensure your pricing system stays current.

Frequently asked questions

Is this calculator only for HST provinces?

No. It also supports GST-only calculations and custom tax percentages.

Can I reverse-calculate tax from a total amount?

Yes. Choose Remove tax from total, enter the total, and the calculator will split out subtotal and tax.

Does this replace professional tax advice?

No. This is a practical calculator for quick estimates and daily workflows. For filing and compliance decisions, consult the CRA guidance or a licensed tax professional.

Final thoughts

If you regularly work with invoices, expense claims, retail pricing, or bookkeeping, a reliable HST calculator Canada tool can save time and reduce errors. Keep this page bookmarked and use it whenever you need to add or remove sales tax quickly.