GST/HST calculator

Reverse HST Calculator Ontario

Use this page when the total already includes Ontario HST and you need the pre-tax amount. Ontario HST is 13%, made up of the 5% federal portion and 8% provincial portion.

Remove Ontario HST View methodology

Common examples

$113 total

$100 before tax

$13 is Ontario HST.

$565 total

$500 before tax

$65 is Ontario HST.

Formula

total / 1.13

Then subtract pre-tax amount from total to get HST.

How to use this page

Use the examples above to confirm the calculation type you need.
Open the full calculator with the button above.
Change the amount, province, rate, or pay period to match your real scenario.
Use the source link below to verify the public rule behind the estimate.

Questions

How do I remove 13% HST from a total?

Divide the tax-included total by 1.13. The difference between the total and pre-tax amount is the HST.

Is Ontario 13% HST in 2026?

Yes. Ontario HST is 13%: 5% federal and 8% provincial.

Source

This page links into the shared usecos calculator engine and cites CRA GST/HST rates.