How long will expire a state refund check from the date it issued?

Most state refund checks remain valid for a period of 12 months from the date they are issued. After this time, they may expire, and the funds could be returned to the state treasury. However, the specific expiration period can vary by state, so it's essential to check the regulations of the relevant state. To avoid issues, it's advisable to cash or deposit the check promptly.