Sales Tax Calculator

Understanding Sales Tax

Sales tax is a tax you must collect from customers and remit to the state. It varies dramatically by state, county, and even city—from 0% (5 states) to over 12% in some areas.

Key Facts: 5 states have NO sales tax (Alaska, Delaware, Montana, New Hampshire, Oregon). 45 states require sales tax. Most have both state AND local county/city taxes that stack. As an online seller on Amazon/Shopify, YOU must collect and remit sales tax from customers in states where you have "nexus" (connection).

Sales Tax = Sale Price × Tax Rate

Sales Tax Calculator 2025

Calculate total sales tax including state and local rates

Purchase Price (Before Tax)

Price of your item before tax is applied

State

State where customer is located

Additional Local Tax Rate (%)

County/city tax (varies by ZIP code - contact county for exact rate)

Price Before Tax: $0.00

State Tax Rate: 0%

Local Tax Rate: 0%

Total Tax Rate: 0%

Sales Tax Amount: $0.00

Total Price (After Tax): $0.00

Sales Tax Examples by State

Example 1: California (High Tax)

Purchase Price: $100.00
State Tax Rate: 7.25%
Typical Local: 1.5% (varies by county)

Total Tax Rate = 8.75%
Sales Tax = $100 × 0.0875 = $8.75
Final Price = $108.75

Example 2: Colorado (Low Tax)

Purchase Price: $100.00
State Tax Rate: 2.90%
Typical Local: 3.5% (varies by county)

Total Tax Rate = 6.40%
Sales Tax = $100 × 0.064 = $6.40
Final Price = $106.40

Example 3: Texas (Mid-Range)

Purchase Price: $100.00
State Tax Rate: 6.25%
Typical Local: 1.5-2% (varies by city)

Total Tax Rate = 7.75% to 8.25%
Sales Tax = $100 × 0.0775 = $7.75-$8.25
Final Price = $107.75-$108.25

Example 4: No-Tax States

Purchase Price: $100.00
State: Delaware, Montana, Oregon, Alaska (except local)
State Tax Rate: 0%

Sales Tax = $0.00
Final Price = $100.00
No state sales tax to collect ✓

Critical Sales Tax Facts for Online Sellers

You must collect & remit: If you have nexus (HQ, warehouse, affiliate, etc.) in a state, you MUST collect sales tax. No exceptions.
Amazon handles it for you: If selling on Amazon FBA, Amazon automatically collects sales tax nationwide (in most cases).
Shopify/Direct: YOU collect: If using Shopify or direct sales, you must enable tax collection and remit to states quarterly or annually.
Local taxes vary wildly: Same item might be 5% tax in one county, 10% in another 30 miles away. Use this calculator + verify with local tax authority.

Sales Tax FAQ

Do I have to collect sales tax online?

Yes, if you have "nexus" (connection) in a state. Nexus includes: having a physical office/warehouse there, having an employee there, being registered as a business there, or (in most states) exceeding $1M in annual sales. As of 2021, most states require you to collect sales tax even if you have no physical presence if you exceed sales thresholds ($100K-$1M depending on state).

Does Amazon collect sales tax for me?

For FBA sellers: YES, Amazon collects and remits sales tax on your behalf in most states (with some exceptions). You don't need to worry. For FBM (Fulfilled by Merchant) sellers: NO, you must set up sales tax collection in Seller Central and remit yourself. Check your Seller Central settings to verify.

What's the difference between state and local tax?

State tax is a flat rate set by the state (e.g., California 7.25%). Local tax is set by counties/cities on top of state tax (e.g., San Francisco County adds 1.5%, making total 8.75%). Local tax varies dramatically—the same item can be 5% tax 30 miles away and 12% in another county. Always check the customer's specific ZIP code for exact rates.

When do I remit collected sales tax?

Frequency varies by state: Monthly (high volume states like CA, TX, NY), Quarterly (most common), or Annually (low volume states). You file a return with the state showing total sales and tax collected, then remit payment. Missing deadlines results in penalties and interest. Consider hiring a tax professional or using software like TaxJar or Avalara to automate this.

What if I don't collect sales tax?

Serious consequences: Back taxes owed + interest (often 10%+) + penalties (10-25%). State tax agencies audit online marketplaces and identify non-compliant sellers. Recent Supreme Court ruling gave states authority to pursue sellers aggressively. It's not worth the risk. Set up proper tax collection immediately if you owe it.

Are digital products taxed?

It depends on the state and product type. Most states tax digital goods (e-books, software, digital downloads) the same as physical products. Some states exempt certain digital products. Check with your state tax authority. The rules are complex and evolving—this is area where professional advice helps.

Can I use sales tax software to automate this?

Yes! Services like TaxJar, Avalara, and Taxify automatically calculate correct tax rates by ZIP code, track sales, generate returns, and file/remit with states. Cost: $20-200/month depending on volume. For most online sellers doing $100K+, this software pays for itself by preventing errors and saving hours of compliance work. Highly recommended.

What if I sell in multiple states?

You must register and collect sales tax in every state where you have nexus or exceed that state's sales threshold. Each state has different rates, filing deadlines, and rules. This gets complex fast. Most sellers at $500K+ annual revenue use automated sales tax software or hire a tax professional. Don't try to manually track 50 different state rules.