October 4, 2026
Enable Shopify Tax, confirm where you have nexus, register in those states, and let Shopify calculate and file where available. The setup itself takes under an hour; the thinking beforehand, figuring out where you legally owe tax, is the real work. Most new stores overthink the software and underthink nexus, which is exactly backwards.
Nexus is the legal connection that obligates you to collect sales tax in a state. Physical nexus comes from offices, warehouses, employees, or inventory in a state, including inventory sitting in a third-party fulfillment center. Economic nexus comes from selling enough into a state, with thresholds that vary, commonly 100,000 dollars in sales or 200 transactions a year.
Map your nexus before touching settings. List where you, your inventory, and your contractors physically are, then check your sales by state against economic thresholds. This list is your tax obligation map, and everything in Shopify flows from it. Guessing here creates liability; the states do not accept I did not know.
You must register for a sales tax permit in each nexus state before collecting a cent there. Collecting without registration is illegal in most states, and the permits are generally free or cheap. Registration happens on each state's revenue department site, not in Shopify, and it takes days to weeks, so start early.
Keep a simple register: state, permit number, filing frequency, due dates. States assign filing frequencies based on your volume, monthly, quarterly, or annually, and missing a filing, even a zero filing, draws penalties. This spreadsheet is the least glamorous and most valuable tax document you will own.
In Settings, Taxes and duties, enable Shopify Tax if it is available for your store. Add each nexus state as a tax region and enter your registration number. Shopify Tax then calculates rates automatically, including the county, city, and district taxes that make US sales tax famously complicated, using the shopper's full address.
Set your product taxability. Most physical goods are taxable, but rules vary: clothing is exempt or reduced in some states, digital products are a patchwork, and shipping taxability differs by state. Walk through your catalog categories against each nexus state's rules once; this is tedious and exactly where errors hide.
Decide whether prices include tax. US shoppers expect tax added at checkout, so leave prices exclusive unless you have a reason. Then run test orders to addresses in each nexus state and confirm the calculated tax looks sane before you take real money.
Shopify Tax can file returns automatically in some states, which removes the most error-prone monthly chore. Where auto-filing is not available, Shopify still produces the reports, but you file on the state's site yourself. Know which of your states are which, because assuming auto-filing covers everything is a classic miss.
Marketplace facilitator laws add a wrinkle: if you also sell on large marketplaces, the marketplace collects on those sales, not you. Do not double-collect, and do not assume marketplace sales count toward your Shopify nexus calculations the same way. Keep the channels' numbers separate.
If you have nexus in more than a handful of states, sell unusual product categories, or cross economic thresholds fast, talk to a sales tax professional. The cost of an hour of advice is trivial next to penalties and back taxes. Automation handles the routine; judgment calls about nexus edge cases are what professionals are for.
Revisit the setup quarterly in your first year. Nexus changes as you grow: new warehouse, new contractor state, a viral month that blows past an economic threshold. A fifteen-minute nexus review each quarter prevents the slow drift into non-compliance.
US sales tax setup is a thinking problem with a software finish. Map nexus, register everywhere you owe, configure Shopify Tax carefully once, and automate filing where you can. The stores that get in trouble are not the ones with complex setups; they are the ones that never did the nexus homework.
Nexus is your store's taxable connection to a state: being located there, storing inventory there, having people working there, or selling past that state's economic threshold. Where you have nexus, you generally must register, collect sales tax, and file. Where you do not, you usually have no collection duty yet, which is why the map changes as a store grows.
Collecting sales tax without a state permit means holding tax you have no account to remit through, which creates its own liability. The correct sequence is register, receive your permit, configure collection in your store settings, then sell. It is a short administrative step that founders skip at their peril and regret at filing time.
By default, Shopify calculates and collects based on your settings and provides reports; filing and remittance remain the merchant's job unless you enroll in a managed tax service or use a filing app. Read the scope of any service carefully. Many founders pair the platform's calculation with an accountant or filing service for the returns themselves.