Why employers legally have to ask this
In the US this question ties to I-9 employment eligibility verification, in the UK to right-to-work checks, both are compliance requirements the employer must complete for every hire, not a judgment call about you specifically. Every candidate gets some version of this question, so there is no need to read it as suspicion.
How to answer it cleanly
Answer factually in one sentence, confirming you are authorized to work there if true, or that you would need visa sponsorship if that is your situation, then stop talking. There is no need to explain your entire immigration history or justify your status unprompted, the interviewer is checking a box, not asking for your life story.
Mistakes candidates make with this question
Getting visibly defensive or asking why they need to know makes an entirely routine question feel tense. Over-explaining, volunteering details about family status, past visa denials, or unrelated personal circumstances, gives the interviewer information they did not ask for and cannot legally weigh in a hiring decision anyway.
Frequently asked questions
Before your next interview, it helps to have the fundamentals down. Our complete guide to preparing for a job interview covers the basics, and the STAR method is a reliable way to structure almost any answer under pressure.