What happens if my partner refuses to leave the business even after agreeing to sell their shares?

A completed share sale and a partner's continued physical or operational involvement in the business are legally separate issues, so the answer depends on what actually happened at closing and what the agreement says about departure. If the shares were properly transferred and paid for, the former partner is no longer an owner regardless of whether they continue showing up — at that point, their presence is really a question of corporate governance, such as whether they can still act as a director or officer, rather than of share ownership.

The purchase agreement should ideally address departure terms directly — resignation from any director or officer roles, return of keys and access, non-interference — as part of closing, rather than assuming it will happen informally. If a former partner won't cooperate with these practical steps after a completed sale, the remaining owner may need to formally remove them from any remaining corporate roles and address continued interference through other legal means.