How it works
How to calculate sales tax
Enter the price and tax rate
Type in the item price and the applicable sales tax percentage. If you are not sure of your rate, most US states charge between 4% and 10.25% when you combine state and local taxes.
Choose tax-inclusive or tax-exclusive
Tax-exclusive means the tax gets added on top of the listed price, which is standard in the US. Tax-inclusive means the tax is already baked into the price, which is how most of Europe and many other countries handle it.
See the breakdown
The calculator shows the tax amount, the pre-tax price, and the final total. Use it to verify checkout totals, set retail prices, or figure out how much tax you owe on a batch of orders.
Sales tax tips for online sellers
Key things every ecommerce seller should know about sales tax.
Know where you have nexus
You only need to collect sales tax in states where you have nexus. That used to mean a physical presence, but since the 2018 Wayfair ruling, most states also establish nexus based on sales volume. Typically $100,000 in sales or 200 transactions triggers it.
Product taxability varies by state
Clothing is tax-exempt in Pennsylvania but taxable in California. Digital products are taxed in some states and not others. Don't assume your product is taxed everywhere just because it is taxed in your home state.
Use tax-inclusive pricing for international sales
Customers in the EU, UK, Australia, and many other markets expect the listed price to include tax. Showing $50 and then adding $8 VAT at checkout creates cart abandonment. Build the tax into the displayed price for those regions.
Automate tax collection on your platform
Shopify, WooCommerce, and BigCommerce all have tax automation built in or available through apps. With over 11,000 tax jurisdictions in the US alone, trying to manage rates manually is a recipe for mistakes.
Set aside collected tax immediately
Sales tax isn't your money. It belongs to the state. Move it to a separate account as soon as you collect it. Stores that mix tax collections with operating funds often get surprised when the quarterly remittance is due.
File on time even if you owe zero
Many states require you to file a return even in months you had no taxable sales. Missing a zero-dollar filing can trigger penalties. Once you have a sales tax permit in a state, you are on the hook to file every period.
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- Inventory turnover calculatorTurnover ratio and days of inventory on hand.
FAQ
Questions, answered
Multiply the item price by the tax rate expressed as a decimal. A $75 purchase at 8% tax: $75 times 0.08 equals $6 in tax, so the total is $81. The calculator does this for you and handles tax-inclusive pricing too.
Tax-exclusive means the listed price doesn't include tax. A $50 item costs $54 after 8% tax. Tax-inclusive means tax is already in the price. A $54 item at 8% tax-inclusive means the base price is $50 and $4 is tax. The US uses tax-exclusive. Most of Europe uses tax-inclusive.
If you have nexus in the buyer's state, yes. After the Supreme Court's Wayfair decision in 2018, most states set economic nexus thresholds. In many states, once you cross $100,000 in sales or 200 transactions, you're required to collect and remit sales tax there.
It's the connection between your business and a state that requires you to collect sales tax. Physical nexus means you have a warehouse, office, or employees there. Economic nexus means you've crossed a sales threshold. Some states also count affiliate relationships or using a marketplace like Amazon as nexus.
Five states have no state-level sales tax: Alaska, Delaware, Montana, New Hampshire, and Oregon. But Alaska allows local jurisdictions to charge their own sales tax, so some cities in Alaska do tax purchases. The other four are completely sales-tax-free.
Depends on the state and your volume. Most states assign a filing frequency when you register: monthly, quarterly, or annually. High-volume sellers in places like California or Texas usually file monthly. Smaller sellers might file quarterly. Some states let you file annually if you collect under a certain amount, like $300 per year.
It depends on the state. About half the states tax shipping charges and half don't. Some states tax shipping only when the items being shipped are taxable. California doesn't tax shipping if it's listed separately on the invoice. Texas does. You really have to check state by state, or use an automated tool.
You become personally liable for the uncollected tax. The state can come after you for back taxes, penalties, and interest. Some states charge 10% to 25% penalties on top of what you owed. If you've been selling for years without collecting in a state where you have nexus, look into voluntary disclosure agreements. They usually reduce penalties significantly.
Build buyer confidence
Customers trust stores that are upfront about costs. WiserReview helps you pair clear pricing with authentic customer reviews, so buyers feel confident all the way through checkout.
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