# Travel >> Travel Preparation >> Travel Regulations

Returning to the UK After Acquiring a US Citizenship

The United Kingdom and United States both allow dual citizenship, so you can legally be a national of both countries. Being a dual citizen has its advantages, such as greater opportunities for work, travel and property ownership. However, it can be confusing when you're traveling internationally, juggling multiple passports and trying to explain your situation at the border. It's important to know your rights and plan ahead before you begin your journey.

United Kingdom passport or residence permit

Instructions

- 1
  Organize all of your U.S. citizenship paperwork before you leave. Bring your citizenship certificate with you; this will facilitate re-entry into the United States.
- 2
  Check that your U.K. passport has not expired. If it will expire before your departure date, visit a U.K. embassy or consulate in the United States. They will help you renew it before you travel.
- 3
  Present your U.K. passport at the airport check-in desk when you check in for your flight. Your passport number will be linked to your flight itinerary.
- 4
  Use only your U.K. passport if you are making flight connections in other countries before you reach the United Kingdom.
- 5
  Fill out HMRC Customs Form C3 if you are bringing belongings with you to the United Kingdom and present this document at the airport Customs inspection.
- 6
  Show your U.K. passport to the immigration officer in the United Kingdom. If asked, inform them that you are a dual citizen of the United States who is returning to the U.K. They may ask additional questions about your travel history, employment and plans in the United Kingdom.