$1.1k mrr and customers in 14 us states — do i have to register for sales tax anywhere yet

The thresholds are the answer and you are nowhere near them, but here is the structure so you can check it yourself as you grow.

States set an economic nexus threshold based on sales into that state. The most common figure is a hundred thousand dollars, with several of the largest states set considerably higher and a couple of others in between. Some states historically also counted a number of separate transactions, commonly two hundred, as an alternative trigger, and states have been steadily abandoning that test in favour of dollars only. Illinois dropped it at the start of this year and Kentucky is dropping it later in the year, and more will follow.

At thirteen thousand a year total, across fourteen states, no single state is close on dollars. The transaction count test is the only theoretical route to a registration for someone your size, it is per state, and the list of states that still use it keeps shrinking.

The other thing that matters more than any of this at your stage: whether software as a service is even taxable in a given state varies. Some tax it, some do not, some tax it differently depending on how it is delivered.

The practical thing I set up when I had this same worry, which took an hour. My billing data exports with a country and state on every charge. A pivot table sums sales by state by year. I look at it once a quarter. If any state gets to about half of its threshold I have a note to go and read that state's rules properly. It has never triggered. But the anxiety went away completely, because I replaced not knowing with a number I can look at.

Do not register early to be safe. That is advice from people who sell registration services.

A registration is not a one time act of tidiness, it is a permanent filing obligation. You will file returns in that state forever, including zero returns, sometimes monthly, and each one is a deadline you can miss and be penalised for. Registering in fourteen states at eleven hundred a month would be the single worst use of your evenings available to you.

Track, do not register. Know your numbers by state. Act when a number gets close to a threshold.

Record the state on every sale from today. That is the entire job until a number gets big, and the version of you in two years will be very glad the data exists.

Migrated the other direction last year and can confirm it is unpleasant. Existing subscriptions do not simply move, and every customer who has to re-enter a card is a customer given a moment to reconsider. I lost a handful who were not unhappy, just reminded.