What are your ongoing obligations after registering for SST?

After you register for Streamlined Sales Tax (SST), four things recur in every state you registered in: collection from your registration date, a return every reporting period including the ones with no sales, tax on your own business purchases, and a written confirmation that you still qualify for free Certified Service Provider (CSP) services. The first three start the day you register. The fourth arrives 24 months in, then every year.

This is the side of the deal you keep. Where you qualify, a member state pays a certified provider to calculate the tax, file the returns, remit the money, and answer the notices. What stays with you is a calendar, two decisions nobody else can make for you, and one letter a year. Schedule it once and it stops being news.

What recurs after you register for SST, how often, and who does it

Table: the recurring obligations after registering through the Streamlined system, how often each falls due, and who performs it. Checked August 20, 2026.

What recurs after SST registration	How often	Who does it
Collect tax in each registered state	Every transaction, from your registration date	You, or your provider
File and pay a return in each registered state	Every reporting period, empty ones included. Each state sets its own due dates, and none may fall earlier than the 20th of the month after the period	A provider files monthly in each state. Without one, you file with each state directly
Remit tax on your own business purchases	Whenever you buy. A separate return, filed with that state	You. It’s outside a provider’s job by definition
Confirm your free-services status in writing	24 months after any CSP began remitting your tax, then in a month of that provider’s choosing each year	Your provider asks. You answer
Re-test whether you still qualify	Whenever your operations change. No cadence is set anywhere	You
Answer state notices	On arrival. No deadline is published	You, or your provider

Six lines. The only one with a moving cadence is the return, because each state sets your filing frequency and tells you in the registration letter it sends you.

Yes, you file an SST return in a state where you had no sales

A return is due for every reporting period in every state you registered in, sales or no sales. That is the states’ own position, and it holds in a state where you’ve dropped back under the remote seller threshold too. It’s also the line that costs the most when it slips, because it runs per state per period and an empty period looks optional. It isn’t.

One exception exists. Some states may put you on an as needed, or casual, filing basis instead, meaning you file when you have sales. The Governing Board says so and names none of them. So build the calendar the strict way, one return per registered state per period, and relax a state’s line only when that state’s own registration letter tells you to.

What stays yours even when a provider does the filing

Two carve-outs, and neither is a service tier you can buy your way out of. Both are worth settling in writing before you sign anything.

Tax on your own purchases. The definition of a certified provider excludes your obligation to remit tax on what your own business buys, so that one never moves, on any plan, with any provider. Talk use tax through with them by all means, but where you don’t report it through your provider, you file a separate use tax return directly with that state. Lodging and tourism tax riding on the same state return stay yours as well.

Your product classification. Liability relief reaches errors traced to the state’s own rate, boundary, and taxability data. It stops at mapping: put a product in the wrong category or under the wrong tax rule and you “will not receive liability relief”, whoever did the mapping. Every product line you add is a classification decision, so agree in writing who makes it and who reviews it. The decision-stage version of this is on the tradeoffs and risks of registering.

The annual free-services confirmation nobody puts on a calendar

Qualifying for free CSP services isn’t settled at registration. Your provider has to come back and ask you, in writing, which states you still qualify in. The first ask lands 24 months after any CSP began remitting your tax, and then once a year after that, in a calendar month the provider picks. The warning sits in your provider agreement because the states’ contract with certified providers puts it there: “failure to respond to the request may result in the Seller losing its status as a CSP-compensated Seller.”

Read that as an operating instruction rather than as paperwork. Silence alone can cost you the free services in a state, separately from anything changing in your business. Put the date in a calendar, decide now who signs it, and keep your own copy of what you sent.

Which changes put your free CSP services at risk

The test runs state by state, so losing Ohio does nothing to Kansas. Four events move the answer in one state, and each one is worth an alert:

• A new warehouse, 3PL node, or office in a member state. Premises and stock on the ground are usually what decide it.
• A remote hire or a relocation into a member state. One salary can do it, and the smaller your company, the larger a share of your total payroll that one state becomes.
• An acquisition or an entity change. The supplier-to-the-state criterion reaches your affiliates, not only the entity that registered.
• Crossing a state’s economic nexus threshold. The false alarm. Meeting a threshold on its own costs you nothing here.

Failing the test in a state changes two things there. Who pays your provider, and who the state contacts in an audit. In a member state where you qualify as a CSP-compensated seller, the state puts its audit questions to your provider rather than to you. That routing holds only where you qualify: in a state where you don’t, the state contacts you directly, and how audits work when you use a CSP sets out what that changes and what it doesn’t. Failing the test does not change your registration, the Simplified Electronic Return, or your relief on that state’s own data. The criteria themselves, and the records to pull to test each one, are on the CSP-compensated seller test. Wire those four triggers to whoever approves a lease, a 3PL contract, or an out-of-state offer letter, because they’ll know months before finance does.

Which changes mean registering again rather than editing

Most updates are self-service. Your DBA, your addresses, your contact details, and adding or ending individual states all happen by logging back into the registration system, and the states pick the change up within a few days.

Four changes work differently: a new FEIN, a social security number becoming a FEIN, a sole proprietorship becoming a corporation, LLC, or partnership, and a name change that brings a new FEIN with it. Each of those means ending your registration and registering again from scratch. A name change on the same FEIN is a paperwork route instead, and a change of contact person has to come from an owner or an officer. How to register for SST through the SSTRS has the mechanics either way.

What ending a registration leaves behind

Ending a registration settles the future rather than the past. The states expect a return for every period you were registered, empty or not, so the last filings outlive the decision.

Two other threads outlive it too. Amnesty, in the one state currently offering it, carries a 36 month condition on staying registered and continuing to collect, so ending early hands the relief back, and what SST amnesty covers and what it costs has the conditions. And where you’re under contract with a provider, ending a state goes through them rather than through the registration system, while the periods between one provider’s last return and the next one’s first are yours to file in every state. How to switch SST providers without losing coverage has that sequence.

What you can’t check about your own SST status, and what nobody publishes

Two gaps, and both of them land on you rather than on the program.

You can’t see your own status flag. The registration system carries a field recording whether a provider is being compensated for you, and it isn’t shown to sellers or displayed on your registration screen. There’s no way to confirm from the outside that a state still treats you as qualifying, which makes your own copy of that annual written confirmation the only record you can actually read. Keep it somewhere a new controller would find it.

Nobody publishes which states allow casual filing. The Governing Board says some states do and names none, so a state’s own registration letter is the only thing that should ever relax a line on your calendar.

One more, and it’s why the first two bite. The evidence behind the annual confirmation is yours to design. The providers’ contract asks for a written statement or representation and stops there: no form, no workpapers, no retention period. We checked the Agreement, that contract, and the states’ registration and filing pages on August 19, 2026. None of them sets a record retention period for you, a deadline for answering a notice, or a penalty figure. The calendar is set for you. The controls behind it aren’t, so whatever you build is what exists.

Nothing here is legal or tax advice.