How to Register for State Sales Tax

Step-by-step guide to registering your business for state sales tax permits, including nexus rules and filing requirements.

1. Determine your nexus obligations. Calculate your gross sales and transaction count by state for the past 12 months. Physical nexus triggers immediately with inventory, employees, or offices. Economic nexus typically kicks in at $100,000 in sales or 200 transactions annually, though thresholds vary by state.
2. Gather your business documentation. Collect your EIN, business formation documents, and bank account details. You'll need your NAICS code, start date, and estimated monthly sales volume. Have your business address and any additional locations ready.
3. Register through each state's portal. File applications directly with each state's department of revenue website. Most states process registrations within 7-14 business days. Avoid third-party services that charge $200-500 when state filings typically cost $0-50.
4. Set up your filing schedule. States assign filing frequencies based on your sales volume: monthly for $20,000+ monthly sales, quarterly for $5,000-20,000, annually for under $5,000. Mark filing deadlines in your calendar—most are the 20th of the month following the reporting period.
5. Configure your sales systems. Update your point-of-sale system or e-commerce platform to collect tax at the correct rates. Sales tax automation software costs $19-99 monthly but prevents costly compliance errors. Manually tracking rates across 10,000+ tax jurisdictions isn't viable.
6. Monitor nexus changes quarterly. Review your sales by state every quarter to catch new nexus obligations. Set up alerts when you approach 80% of any state's threshold. Late registration can trigger penalties of $50-500 plus interest on uncollected taxes.