Add GST/HST, an exchange-rate buffer or a renewal price increase to a hosting or cloud bill to see the amount to budget.
Use this calculator when you know today's bill and want to budget for what comes next: a tax-inclusive total, a US-dollar bill that may cost more if the Canadian dollar weakens, or a hosting plan whose introductory price ends at renewal. It answers one question: today's amount plus a percentage plus known extras equals what?
How to fill it in. Enter the current bill in Canadian dollars, monthly or yearly (the result uses the same period). In the percentage field, enter one of: an exchange-rate buffer plus any announced price change; the renewal uplift from your hosting contract; or the sales tax rate that applies to you. Add any fixed extras you already expect.
Formula. Extra amount = bill × percentage + fixed extras. Budgeted bill = bill + extra amount.
Worked example (illustrative). A cloud bill billed in US dollars converts to about $850 a month. The owner adds a 5% FX buffer and 3% for a possible price change, 8% in total, plus $60 for a new backup add-on. Extra: $850 × 8% + $60 = $128. Budgeted bill: $978 a month before tax.
Tax-inclusive use. Run it again on $978 with 13% (Ontario HST) and $0 fixed: $978 × 13% = $127.14, total $1,105.14. A GST/HST registrant can usually claim that tax back as an input tax credit when a regular registrant charged it, so it is a cash-flow cost. Tax charged by a supplier registered only under the simplified regime generally cannot be claimed.
Limits. Do not add percentages for tax and FX together in one run, because tax applies to the converted amount; run them one after the other. Exchange rates can move more than any buffer. See USD pricing and FX and GST/HST, QST and PST on hosting.
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