Sales Tax Calculator

Take a $250 pre-tax order. If the state rate is 6.25% and the buyer's county adds 1% and the city adds 0.75%, the combined rate is 8%. Tax is $250 × 0.08 = $20.00 and the customer pays $270.00. Change only the delivery address — same state, a suburb with no city rate — and the combined rate drops to 7.25%, tax becomes $18.13, and the total is $268.13. Nothing about the product changed; $1.87 moved because of a boundary line.

Working backwards from a tax-inclusive figure is a different operation and a common source of error. If you were paid $270.00 gross at a combined 8%, the pre-tax amount is $270.00 ÷ 1.08 = $250.00, not $270.00 × 0.92 = $248.40. Subtracting the rate from the total undercounts the base and understates what you owe the state — a small percentage that compounds across every transaction in a filing period.

A delivery destination frequently controls the rate for interstate remote sales, while some intrastate transactions use origin-based rules. The result depends on the state, the seller's facts, the product, and how delivery occurs; confirm the sourcing rule rather than inferring it from the selected state.

The practical consequence: if you ship anywhere beyond your own city, you cannot store one rate. Ship-to addresses in the same ZIP code can fall in different special districts, because taxing districts — transit authorities, hospital districts, stadium districts — follow their own boundaries, not postal ones. Use this calculator when you know the rate that applies; use address-level rate lookup or automated tax software when you need to determine it at scale.

You collect sales tax in a state only if you have nexus there. Physical nexus comes from an office, a warehouse, inventory stored in a fulfillment center, employees, or sometimes a contractor or a trade show presence. Economic nexus comes from crossing a state's sales or transaction threshold from remote selling alone — each state sets its own threshold and its own measurement window, and several have changed or removed the transaction-count part of the test since these rules were introduced.

Two things require separate evidence. Inventory placed in a fulfillment network can create a physical connection that deserves state-specific review. A marketplace facilitator may collect and remit on qualifying marketplace orders, while direct-store orders and marketplace sales can still affect nexus or reporting differently by state. Keep those channels separate in the source data.

Nexus can create registration, collection, and filing duties, but timing and zero-return requirements are state-specific. Follow the registration letter and current revenue-department instructions for each account.

Taxability is decided line by line, not per order. Many states treat unprepared groceries and prescription drugs differently from general merchandise — exempt entirely, taxed at a reduced rate, or taxed only when prepared for immediate consumption. Clothing, digital goods, software delivered electronically, and services all have wildly inconsistent treatment across state lines: the same downloadable file is taxable in some states and not in others.

Separately, some buyers or uses may qualify for exemptions, including documented resale purchases or certain exempt organizations. Certificate rules and seller responsibilities differ by jurisdiction, so retain the form and validation evidence required by the relevant state.

Shipping and handling are their own trap: taxable in some states, exempt in others, and in several states taxable only if the shipping charge is not separately stated on the invoice.

It applies a rate you supply to a price you supply. It does not look up the rate for an address, decide whether your product category is taxable, evaluate nexus, or track filing deadlines. Use it for quoting, for checking a checkout figure that looks wrong, for reconciling a single invoice, or for pricing decisions where you need the tax-inclusive number a customer will see.

It also does not handle tax holidays, tiered or capped rates that some states apply to large-ticket items such as vehicles and boats, or use tax — the counterpart owed by a buyer who was not charged sales tax on a taxable purchase. If your filing volume is meaningful, treat the calculator as a sanity check and let dedicated tax software or an accountant own the returns.