If you’re a UK business owner selling into the US, it’s easy to treat the US as one market. Then the state questions start: “Are you registered in our state?” “Where are you doing business?” “Where is your team based?” “Where is your inventory stored?” “Do you have sales tax in this state?” Multi-state compliance is one of the most common reasons US expansion suddenly feels harder. It rarely arrives as one big event. It creeps in through hiring, fulfilment, client requirement