New State Sales Tax Registration Checklist
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A step by step checklist for registering for sales tax in a new state and switching collection on in every system that charges tax.

[ ] Confirm why you have nexus in this state: physical presence, an economic threshold crossed, or both, and write down the date it started.
[ ] Record which sales the state counts toward its threshold (gross, retail, or taxable, and whether marketplace sales are included) and keep the calculation you used.
[ ] Decide whether any past exposure should go through a voluntary disclosure agreement before you submit a registration that asks when nexus began.
[ ] Gather your federal EIN, legal business name, any trade names, physical address, mailing address, and the NAICS code you use on other filings.
[ ] List the owners or officers the state will ask about, with titles, contact details, and any identification the portal requires from them.
[ ] Estimate your expected monthly taxable sales in the state so you can answer the filing frequency question honestly rather than guessing.
[ ] Note the date you first sold into the state and the date you expect your first taxable sale under the new registration.
[ ] Create or log into the state revenue department portal using a shared team account entry, not one person's private login.
[ ] Complete the registration and save a PDF of the confirmation page, the permit or account number, and any letter the state mails you.
[ ] Record the assigned filing frequency, the first due date, and any prepayment requirement in your filing calendar the same day.
[ ] Check whether the state requires a separate local or home rule registration for cities or counties, and handle it before you move on.
[ ] Turn on collection for this state in your storefront checkout and confirm the effective date matches your registration date.
[ ] Turn on collection in your invoicing tool and any point of sale device, then place a small test order or draft invoice to confirm tax appears.
[ ] Confirm your tax engine is applying the sourcing rule the state uses (destination or origin) and pulling local rates where they apply.
[ ] Review product taxability settings for this state, including software, digital goods, shipping charges, and services you sell.
[ ] Set up a process for collecting and storing resale or exemption certificates from wholesale customers in the state.
[ ] Add the state to your nexus tracking worksheet, mark it as registered, and note the effective date and account number.
[ ] Tell your accountant or filing service the account number, filing frequency, first due date, and how they can access the portal.
[ ] Reconcile the first month of collected tax against your sales report by state before the first return is due.
[ ] Schedule a review date after the first due date to confirm the return was filed, the payment cleared, and the portal shows no notices.