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GST and QST Calculator — result sheet
Estimate GST, QST, combined tax, and the after-tax amount with visitor-entered rates and a transparent choice of QST tax base.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: GST = amount × GST rate; QST = selected QST base × QST rate; total tax = GST + QST; after-tax total = amount + total tax.
The calculator keeps rates editable because tax treatment depends on the transaction, location, taxable status, and current rules. The QST-base selector makes the compounding assumption visible rather than hiding it in a fixed rate.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Pre-tax amount — currency units; minimum 0; maximum 100000000
- GST rate — %; minimum 0; maximum 100
- QST rate — %; minimum 0; maximum 100
- QST base — 2 choices
Worked example
| Input | Value |
|---|---|
| Pre-tax amount | 100 |
| GST rate | 5 |
| QST rate | 9.975 |
| QST base | original |
GST = 5; QST = 9.975; combined tax = 14.975; after-tax amount = 114.975 before display rounding.
Assumptions and limits
- Rates are entered by the visitor and are not fetched from a live tax table.
- The amount is a pre-tax monetary amount in the user's chosen currency.
- GST and QST are treated as percentage rates for this scenario.
- The selected QST base is a modelling choice and must match the applicable transaction rule.
- Rounding, exemptions, zero-rated supplies, registration, place of supply, and filing treatment are not inferred.
- The result is an estimate and not tax advice or a remittance calculation.
- Confirm current rules with the relevant tax authority or a qualified professional.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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