Add GST, HST or GST plus QST to a managed security fee to see the invoice total and the tax you may be able to claim back as an input tax credit.
Managed security services are generally taxable supplies, so a Canadian-registered provider adds GST or HST, and in Quebec also QST, to the fee. This calculator shows the invoice total so you can compare quotes on the same basis and plan cash flow.
How to fill it in. Enter the fee before tax and the combined rate that applies to the supply. Examples of combined rates as published by the Canada Revenue Agency and Revenu Québec: 5% GST; 13% HST in Ontario; 14% HST in Nova Scotia (since 1 April 2025); 15% HST in New Brunswick, Newfoundland and Labrador and Prince Edward Island; 5% GST plus 9.975% QST = 14.975% in Quebec. Which rate applies depends on the place-of-supply rules, not only where your office is, so confirm with the provider or your accountant.
Formula. Tax = fee × rate. Invoice total = fee + tax.
Worked example. An Ontario business pays $3,000 a month: tax = $3,000 × 13% = $390; invoice total = $3,390. If the business is a GST/HST registrant using the service in its commercial activities, it can usually claim the $390 back as an input tax credit, so the real cost stays $3,000.
Limits. Provincial sales tax (for example BC PST on software) and foreign-vendor rules are not modelled. See GST/HST and QST on managed security services.
Pricing Models, Comparisons and 2026 Rules
GST, HST, QST and PST on managed security and pen-test fees in Canada, input tax credits, foreign providers and tax-inclusive budgets.
