The Immigration Health Surcharge (IHS) is a mandatory fee that expats pay as part of most UK visa applications to access public healthcare services. For expats, paying the IHS allows them to use the National Health Service (NHS) in a similar way to residents once they arrive. Expats in the UK must usually pay the surcharge upfront for the full length of their visa, and the cost can be significant for families applying together. After paying the IHS, expats in the UK can register with a local GP, receive hospital treatment, and access many NHS services without additional charges at the point of use, although some costs, such as prescriptions or dental care, may still apply. The IHS does not cover private healthcare, but many expats choose to combine NHS access with private insurance for faster appointments or specialist care. Because the IHS rules and fees can change, expats are advised to check the latest government guidance before submitting their visa application.