Carrying cash from United Kingdom to Thailand
Two separate rules apply to any cash journey: one where you leave, one where you arrive.
Do you need to declare?
Yes: and on both legs of the journey. Leaving United Kingdom, HM Revenue & Customs requires a declaration above GBP 10,000. Entering Thailand, Bank of Thailand (exchange control) requires a declaration above THB 450,000. The two rules are independent: satisfying one does not satisfy the other.
Travelling as a family or group?
The threshold applies to your combined total, not per person. A family of four each carrying a little under the limit is still over it, and splitting cash between travellers to stay under does not make it legal.
The two legs
| Leg | Limit | Form | Authority |
|---|---|---|---|
| Leaving United Kingdom | GBP 10,000 | Declare cash online (GOV.UK) or form C9011 | HM Revenue & Customs |
| Entering Thailand | THB 450,000 | no form | Bank of Thailand (exchange control) |
The same threshold applies on the way out.
No limit applies to bringing baht or foreign currency into Thailand. A customs declaration is required above THB 450,000, or above USD 15,000 in foreign currency banknotes.
If you do not declare
United Kingdom: Cash may be seized and a penalty of up to GBP 5,000 applied.
There is no limit on how much you may legally carry in either direction, the duty is to report it, not to keep under it. Failing to report is the offence.
Currencies
United Kingdom uses GBP; Thailand uses THB.
Sources: rules as of 22 September 2026. This is general information, not legal advice; always check the official authority before travelling.