HST Converter

About This Tool

The HST Converter computes tax-inclusive amounts from net amounts and vice versa for Canadian HST regions. It maps province-specific rates (Ontario 13%, other HST provinces 15%) and allows a rate_override for non-standard scenarios. The tool outputs gross_amount, net_amount, tax_amount, and rate_used, with values rounded to two decimals. It works in real time, enabling fast scenario testing for quotes, invoicing, or tax reporting. By design, it supports common business workflows where precise tax calculations are essential for compliant pricing and reconciliation. Conceptually, the tool retrieves the applicable rate from a region map and applies standard tax arithmetic: gross = net * (1 + rate), or net = gross / (1 + rate). The rate_used is shown to provide auditable lineage for each calculation. If a region is not covered by the HST set and no rate_override is provided, an input error is produced to prevent silent mispricing. The approach emphasizes simplicity, reproducibility, and traceability for financial records. Intended users include sole proprietors, bookkeepers, and small teams that prepare invoices, estimates, or tax reports. Unique value lies in instant, auditable conversions tied directly to provincial harmonized tax structures, with optional overrides for bilateral agreements or special pricing. Core features include a clear input model, explicit rate disclosure, precise rounding, and consistent formatting for integration with accounting workflows.

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