Sales Tax Calculator

Use this calculator to estimate sales tax amount and total price including tax. Essential for accurate checkout totals, building quotes and invoices, and understanding final customer payment amounts.

What this calculator does

The sales tax calculator helps you calculate the sales tax amount and total price a customer pays after tax is added.

It uses:

• pre-tax price
• sales tax rate

This gives you the sales tax amount and the total including tax — the two figures needed for accurate invoicing, checkout pricing, and customer-facing price display.

Sales Tax Formula

Sales Tax = Amount × (Tax Rate ÷ 100)

Where:

• Amount = pre-tax price of the product or service
• Tax Rate = applicable sales tax percentage
• Sales Tax = tax amount added to the pre-tax price
• Total Including Tax = Amount + Sales Tax

Example calculation

If:

• Amount = 100
• Sales tax rate = 8%

Then:

• Sales Tax = 100 × 0.08
• Sales Tax = 8
• Total including tax = 100 + 8 = 108

The customer pays 108 — the 100 product price plus 8 in sales tax.

What is sales tax?

Sales tax is a consumption tax levied on the sale of goods and services at the point of final retail sale. The seller collects it from the customer and remits it to the tax authority. In the US, sales tax is set at state, county, and city level — combined rates range from 0% to over 10% depending on location.

Why sales tax matters for pricing and invoicing

Understanding sales tax helps you:

• calculate correct checkout totals that include all applicable tax
• display tax-inclusive or tax-exclusive prices accurately
• build quotes and invoices that reflect the true amount payable
• comply with collection and remittance obligations in your jurisdiction

When to use this calculator

Use this calculator when you want to:

• calculate the tax amount and total for a specific price and rate
• compare checkout totals at different tax rates
• build a quote or invoice showing pre-tax price, tax, and total
• verify your ecommerce platform applies the correct calculation

Common mistakes when calculating sales tax

Common mistakes include:

• applying the state rate without adding applicable county and city rates
• forgetting that some products are exempt or taxed at reduced rates in certain states
• confusing sales tax with VAT — they are different systems
• applying tax to the original price rather than the discounted price

Sales tax vs VAT

These two consumption taxes look similar to customers but operate very differently.

• Sales tax is charged only at the final point of sale to the consumer. Businesses in the supply chain do not pay it on purchases from other businesses
• VAT is charged at every stage of the supply chain. Each business collects VAT on sales and reclaims VAT paid on purchases, remitting only the net amount

Use the VAT Calculator for UK, EU, and other VAT-based calculations.

FAQs

What is sales tax?

Sales tax is a consumption tax applied at the point of final retail sale. The seller collects it from the customer and remits it to the tax authority. In the US, rates vary by state, county, and city.

How do you calculate sales tax?

Sales Tax = Amount × (Tax Rate ÷ 100). The total including tax is the pre-tax amount plus the sales tax. For 100 at an 8% rate, the sales tax is 8 and the total is 108.

What is a good sales tax rate to use?

There is no single rate — sales tax depends entirely on the jurisdiction of the sale. US state rates range from 0% to 7.25%, with combined state and local rates typically between 6% and 10%. Always verify the rate for the specific location and product type.

What is the difference between sales tax and VAT?

Sales tax is charged once at the final retail sale. VAT is charged at every stage of the supply chain, with businesses reclaiming VAT paid on purchases. The customer-facing calculation is similar but the supply chain accounting is fundamentally different.