How to Register for Sales Tax: A Step-by-Step Guide for Startups

You need to register in a state when two things are true: you have nexus there, and you sell something that state taxes. Nexus comes from physical presence (an office, an employee, inventory) or from economic activity above the state's threshold, which is $100,000 of annual sales in most states after South Dakota v. Wayfair (2018).

The second half of that test is where founders get tripped up. A SaaS company can have nexus in California and still have nothing to register for, because California does not tax SaaS until January 1, 2027 (SB 122). The same company with the same revenue in Washington or Texas would need a permit, because both states tax it. A hardware startup shipping physical goods, by contrast, sells taxable products almost everywhere.

Timing matters too. In most states you must hold the permit before your first taxable sale in that state, or within a short window after crossing the economic threshold. We usually tell seed-stage teams to register the month they cross a threshold rather than waiting for the quarter to end. Collecting tax without a permit is a violation in most states, and selling without collecting builds a liability you will pay out of your own margin later.

Start with a list, not a portal. For each state, answer three questions:

1. Do we have physical presence here? Count offices, remote employees, contractors who sell for you, inventory (including Amazon FBA warehouses) and equipment you own.
2. Did our sales into this state cross the economic threshold in the current or prior measurement period? Check the state's dollar figure and whether it still uses a transaction count.
3. Is what we sell taxable here? Physical goods usually are. SaaS, digital downloads and services vary widely.

If the answer to 1 or 2 is yes and the answer to 3 is yes, you register. Your home state almost always makes the list, since your office and employees give you physical nexus there.

Do not register in states where you have no nexus just because it feels tidy. A permit creates filing obligations, often monthly or quarterly zero returns, and closing an account later takes paperwork. Our state-by-state table of economic thresholds is linked at the end of this post.

Every state application asks for roughly the same data. Having it in one document cuts each registration to 20 or 30 minutes:

• Legal entity name, any DBA, and the state and date of formation
• Federal EIN and, if you have one, your home-state tax ID
• NAICS code and a plain description of what you sell
• Business address, mailing address and the address of any in-state location or warehouse
• Names, home addresses, SSNs (or ITINs) and titles of officers or responsible persons
• Date of first sale in the state, or the date you crossed the economic threshold
• Estimated monthly taxable sales in the state
• Bank account for electronic payments

The responsible-person question surprises foreign founders. Many states hold officers personally liable for collected but unremitted sales tax, so they ask for an SSN or ITIN. If a founder has neither, most states accept a paper or alternative application, but expect it to take longer.

The estimated sales figure drives your filing frequency, so give a realistic number rather than zero.

Apply online through the state's own portal. Examples: Connecticut uses myconneCT, Arizona uses AZTaxes.gov, Hawaii uses Hawaii Tax Online, and Texas has its Online Sales Tax Registration Application (or paper Form AP-201). California registrations go through the CDTFA online services portal.

Turnaround varies. Connecticut says the permit is available to print the next business day. Hawaii's Department of Taxation quotes roughly 5 to 7 days for online applications and 4 to 6 weeks by mail. Some states issue a number instantly and mail the paper permit later.

Avoid paid 'permit filing' services that charge $100 or more to submit a free application on your behalf. They add nothing the state portal does not already do, and they sometimes enter the wrong NAICS code or first-sale date, which is harder to fix later than to get right yourself.

When the permit arrives, save a PDF in a shared compliance folder with the account number, filing frequency and portal login owner. You will need all three on the first due date.

Most states charge nothing to register for sales tax. A handful charge a modest fee, and some can require a security deposit or bond from businesses they consider higher risk. Figures below were checked against each state's revenue department in October 2026.

The bond or deposit is the cost to watch, not the fee. Texas can require security before issuing a permit, typically for businesses with high expected volume or a history of delinquency. A startup with clean history rarely sees one.

Also budget for software. Once you are registered in more than three or four states, paying a sales tax engine to calculate rates and file returns is usually cheaper than the staff time it replaces.

The Streamlined Sales Tax Registration System (SSTRS) lets you register in any of the 24 participating states with one application, and there is no fee to register through it. As of October 2026 the 23 full member states are Arkansas, Georgia, Indiana, Iowa, Kansas, Kentucky, Michigan, Minnesota, Nebraska, Nevada, New Jersey, North Carolina, North Dakota, Ohio, Oklahoma, Rhode Island, South Dakota, Utah, Vermont, Washington, West Virginia, Wisconsin and Wyoming. Tennessee is an associate member.

You do not have to register in all of them. SST says you must register in each state where you meet that state's nexus standard, and you can pick only those states.

Two points people miss. First, SSTRS does not file returns. You still report and pay each state directly, unless you contract with a Certified Service Provider. Second, sellers that qualify under each state's rules can have a CSP handle calculation, filing and remittance at the state's expense. SST lists Avalara, TaxCloud, Sovos, AccurateTax and Avior as certified and offering free services. For a small remote seller registered in several SST states, that can be a real saving.

California, Texas, New York, Florida and Illinois are not SST members, so you register with them directly.

Each state assigns a filing frequency when it approves your registration, based mostly on the estimated taxable sales you entered. Higher expected tax means monthly returns. Lower means quarterly or annual. The thresholds differ by state, and the notice you receive with the permit tells you which schedule you are on.

Three practical rules:

• File every period, even with zero sales. Most states require a return for every assigned period, and missing a zero return can trigger a penalty or a notice that your account is delinquent.
• Expect reassignment. States review your actual liability and can move you from quarterly to monthly as you grow, usually by letter. Update your calendar the day the letter arrives.
• Ask for a less frequent schedule when it fits. If you were assigned monthly but your real liability is small, many states will move you to quarterly on request.

Due dates differ by state. Many states set the 20th of the month after the period, but not all, and some set different dates for annual filers. Read the due date off your registration notice rather than assuming.

Put every due date in a shared calendar with an owner. Late sales tax returns usually carry a penalty plus interest, and repeated lateness can lead a state to demand a security deposit.

Getting the permit is the start. Here is the order we work through with new clients:

1. Turn on tax collection in your checkout or billing system for that state, effective from the permit date. Map each product to the right tax code so exempt items are not taxed.
2. Collect resale and exemption certificates from wholesale and exempt customers before you invoice them without tax.
3. File the first return on time, even if it is a partial period.
4. Reconcile tax collected to tax remitted each month. The two should match to the dollar after timing differences.
5. Keep watching thresholds in states where you are not yet registered, since crossing one later means another application.
6. If you sold into the state before registering, size the back exposure and decide whether a voluntary disclosure agreement makes sense.

This guide covers the general process, not tax advice for your specific facts. If you are unsure whether your product is taxable in a given state, settle that before registering, because the answer decides whether you need the permit at all.