
US Sales Tax Basics for Online Sellers
US sales tax is a patchwork, not a single rule. Here is the foundation every online seller needs.
Practical, honest advice from the team behind SalesTaxly, written to help you do this well.

US sales tax is a patchwork, not a single rule. Here is the foundation every online seller needs.

You can owe sales tax in a state you have never set foot in. Here is how that works.

Which rate applies, the seller's or the buyer's? It depends. Here is the distinction.

The rate that was right last quarter may be wrong today. Here is why rates keep moving.

Most sales tax trouble comes from a few avoidable errors. Here they are.

Getting checkout right protects your margin and your customers. Here is how.

The rate is only half the story. What you sell also decides how it is taxed.

Filing is much easier when you have kept good records. Here is how to prepare with confidence.

Selling on a marketplace changes who handles the tax. Here is what that means for you.

Shipping is one of the few line items where the tax answer flips from state to state. Here is how the rules break down and how to configure your store so the shipping line gets taxed correctly without manual fixes.

Resellers, schools, nonprofits, and government buyers all show up asking for no tax at checkout. Here is what you must collect, what you can accept, and how to keep the paperwork from becoming your biggest audit exposure.

Two customers with the same city name and ZIP code can owe different tax rates. The reason is how local tax districts are drawn, and the fix is address-level lookup instead of ZIP-level guessing.

Knowing what economic nexus is does not help if you find out you crossed a threshold eight months late. This is a practical system for monitoring sales by state so registration happens on time and not after a notice arrives.

A return is a taxed sale running in reverse, and the tax has to follow the money. Here is how to refund the right amount, claim the credit on your return, and deal with partial refunds, restocking fees, and exchanges.

Sales tax holidays are short, product-specific, and full of edge cases around price caps, order timing, and local participation. Here is how to prepare your store so the exemption applies correctly for the few days it lasts.

A subscription is a new sale every billing cycle, and the tax on it can change even when the customer and the product do not. Here is when to recalculate, what can change between cycles, and how to keep recurring billing compliant.

An audit notice is a deadline, a scope, and a records request, not a verdict. Here is how to respond in the first week, what auditors actually look for in an ecommerce business, and how to keep the assessment as small as the facts allow.

Promotions change the taxable price in some cases and not in others, and gift cards move the tax to a different moment entirely. Here is how each type of discount affects the tax line at checkout.

A drop shipped order is two sales stacked on top of each other, and each one has its own tax answer. Here is how to keep the wholesale leg exempt and the retail leg correct.

Finding out late that you had nexus feels like a disaster, and it usually is not. Here is how to size the exposure, choose between plain registration and a voluntary disclosure, and decide who absorbs the tax.