How do I calculate sales tax?

Multiply the pre-tax amount by the tax rate (as a decimal). For example, $100 at an 8.25% tax rate: $100 × 0.0825 = $8.25 in tax, for a total of $108.25.

Do I need to charge sales tax on my invoices?

It depends on your location, what you're selling, and where your customer is located. Physical products are generally taxable. Services vary by state — some states tax all services, others only tax specific types. Consult a tax professional for your specific situation.

What is the difference between sales tax and use tax?

Sales tax is collected by the seller at the point of sale. Use tax is a complementary tax that buyers owe when they purchase taxable goods from out-of-state sellers who didn't collect sales tax. The rates are typically the same.

What is an effective tax rate?

The effective tax rate is the tax amount as a percentage of the total (tax-inclusive) price. It's always slightly lower than the stated tax rate. For example, an 8.25% sales tax has an effective rate of about 7.62% when calculated against the total price.

Sales Tax Calculator

Quickly calculate the sales tax on any purchase. Enter an amount and tax rate to see the tax due and the total after tax.

Enter Amount & Tax Rate

Amount Before Tax ($)

Tax Rate (%)

Tax Amount

$8.25

Effective Rate

7.62%

Total After Tax

$108.25

Breakdown

Amount before tax: $100.00
Tax rate: 8.25%
Tax amount: +$8.25
Total after tax: $108.25
Effective rate (Tax ÷ Total): 7.62%

Understanding Sales Tax

Sales tax is a consumption tax imposed by state and local governments on the sale of goods and certain services. As a business owner, understanding how to calculate and collect sales tax is essential for compliance.

The Formula

Tax Amount = Pre-Tax Amount × (Tax Rate ÷ 100)

Total = Pre-Tax Amount + Tax Amount

Sales Tax in the US

The US has no federal sales tax. Each state sets its own rate (ranging from 0% in states like Oregon to over 7% in states like California). Many cities and counties add additional local taxes, making the combined rate vary significantly by location.

Tax on Invoices

If you sell taxable goods or services, you typically need to add sales tax as a separate line item on your invoices. This makes it clear to the client what they're paying and simplifies your tax reporting when it's time to remit collected taxes.

Register for a sales tax permit in each state where you have nexus.
Charge the correct combined rate for the buyer's location.
Collect and remit taxes on the schedule required by your state (monthly, quarterly, or annually).
Keep detailed records for audit purposes.

Frequently Asked Questions

How do I calculate sales tax?: Multiply the pre-tax amount by the tax rate (as a decimal). For example, $100 at an 8.25% tax rate: $100 × 0.0825 = $8.25 in tax, for a total of $108.25.
Do I need to charge sales tax on my invoices?: It depends on your location, what you're selling, and where your customer is located. Physical products are generally taxable. Services vary by state — some states tax all services, others only tax specific types. Consult a tax professional for your specific situation.
What is the difference between sales tax and use tax?: Sales tax is collected by the seller at the point of sale. Use tax is a complementary tax that buyers owe when they purchase taxable goods from out-of-state sellers who didn't collect sales tax. The rates are typically the same.
What is an effective tax rate?: The effective tax rate is the tax amount as a percentage of the total (tax-inclusive) price. It's always slightly lower than the stated tax rate. For example, an 8.25% sales tax has an effective rate of about 7.62% when calculated against the total price.

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