Online HST Calculator

The tool computes Harmonized Sales Tax on a CAD-subtotal by applying the relevant provincial rate or combined HST. It supports common Canadian tax models (HST and GST/PST) and returns a tax amount and a final total that can be used for quotes, invoices, or pricing analysis. Input values include a base_amount in CAD, a province code, and a tax scheme; outputs include tax_amount, total_amount, and an explicit rate. The calculator uses a built-in rate table to stay fast and offline-friendly, avoiding external data dependencies.

Conceptually, the tool looks up the applicable tax rate for the selected province, computes tax as base_amount multiplied by that rate, and sums base and tax to produce the total. It can also handle tax-inclusive totals by reversing the calculation to extract the pre-tax subtotal. Rounding is performed to two decimals to align with typical invoicing standards. Users can optionally adjust precision or export results for accounting workflows.

Who benefits include small business owners, freelancers, bookkeepers, and sales teams who price goods or services across Canada. Unique value lies in an embedded, up-to-date rate table and simple, model-accurate calculations without external calls. Use cases include generating client quotes, validating pricing across provinces, preparing tax-compliant invoices, or performing scenario planning for pricing changes. It emphasizes accuracy, speed, and portability for accounting or e-commerce workflows.