The FCDO covers most core costs in the UK, including accommodation, internal transport and meals for the visiting delegation
The department can provide extra funding where police forces face significant additional security costs.
The visiting country normally pays for international travel to and from the UK, while local authorities may also incur logistical costs linked to hosting major events.
The Royal Borough of Windsor and Maidenhead said it spent about £350,000 supporting three state visits in 2025 and has not been reimbursed.
It has said that local taxpayers cannot be expected to cover the costs and warned that it would not support future events without government reassurance.
Thames Valley Police has raised similar concerns.
Police and crime commissioner Matthew Barber said it was unable to reclaim about £900,000 in officer time linked to Donald Trump’s state visit because current funding rules do not cover staffing costs.
The Home Office said TVP would “receive additional costs” linked to the state visit.
The FCDO was contacted for a comment.