Discount Plus Tax Calculator

Worked example

Example: a $200 item with a 20% discount and 8% sales tax drops to $160 before tax, then $172.80 after tax—a $27.20 savings from the original taxed price.

How it works

Enter the original price, an optional discount as a percent off or flat dollar coupon, and an optional sales tax percent. Discount is applied first, then tax is calculated on the discounted price. Coupons, fees, and shipping are not included.

Limitations

Results are based on the inputs you provide and may not cover every edge case. This tool is for general use and is not professional advice.

Privacy and file handling

Your data stays on your device and is not uploaded.

Accuracy & methodology

This section documents how the calculator works, what it leaves out, and when results were last reviewed. Figures are educational estimates—not professional advice—and are not labeled "current" unless tied to automatically updated reference data.

Formula source or methodology

Discounted price = original × (1 − discount%). Tax = discounted price × tax%. Total = discounted price + tax.

Jurisdiction

User-defined

Unit system

Currency; percent

Rounding method

Currency amounts round to two decimal places (half up via Math.round × 100 / 100).

Assumptions

• Discount applied before tax
• Single tax rate on the discounted subtotal

Known omissions

• Coupons, shipping, and fees
• Tax-on-original-price jurisdictions
• Multiple tax tiers

Test cases (automated)

• $200, 20% off, 8% tax → $160 subtotal, $12.80 tax, $172.80 total

Version & last verified

Logic version 1.0. Content and formulas last verified 2026-07-24.