Sales Tax Calculator
Calculation Results
Total Sales Tax:
$0.00
Total Amount:
$0.00
Data Source and Methodology
All calculations are based on the standard Texas sales tax rate as provided by the Texas Comptroller. All calculations are rigorously based on these formulas and data.
The Formula Explained
Sales Tax Calculation: Tax = PurchaseAmount × (Tax Rate / 100)
Total Amount: Total = PurchaseAmount + Tax
Glossary of Terms
- Purchase Amount: The total amount before tax.
- Tax Rate: The percentage of sales tax applied.
- Total Sales Tax: The amount of tax added to the purchase.
- Total Amount: The final amount including sales tax.
Frequently Asked Questions (FAQ)
What is sales tax?
Sales tax is a tax imposed by the government on the sale of goods and services.
How is sales tax calculated in Texas?
The sales tax in Texas is calculated by multiplying the purchase amount by the sales tax rate.
What is the current sales tax rate in Texas?
The standard sales tax rate in Texas is 6.25% but local jurisdictions can add up to 2%.
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
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Formula (extracted LaTeX)
\[{totalTax}`; document.getElementById('totalAmount').textContent = `\]
{totalTax}`; document.getElementById('totalAmount').textContent = `
Formula (extracted text)
Sales Tax Calculation: Tax = PurchaseAmount × (Tax Rate / 100) Total Amount: Total = PurchaseAmount + Tax
Variables and units
- T = property tax (annual or monthly depending on input) (currency)
Sources (authoritative):
- Texas Comptroller — comptroller.texas.gov · Accessed 2026-01-19
https://comptroller.texas.gov/taxes/sales/
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
- Initial audit spec draft generated from HTML extraction (review required).
- Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
- Confirm sources are authoritative and relevant to the calculator methodology.