• Send a secure message
    Sign on to Citi Online and send us a secure message to ask about your account or update your details. We will get back to you within 48 hours.
  • You can write to us
    Customer Service Team
    Citibank UK Limited
    PO Box 4012
    SN4 4JZ
  • You can call us on 0800 00 55 00
    If calling from abroad dial: +44 20 7500 5500 Available 24 hours a day, 7 days a week.
Contact Us

You can make a variety of account-related requests by printing, completing and signing the relevant form and posting it to us at: GCB Banking, Citibank UK Limited, PO Box 4012, Swindon, SN4 4JZ

  • W-9
    To be completed if you are a US Person.
  • Add an account holder
    To be completed if you’d like to add another account holder to your existing account.
  • Non-US Person
    To be completed if you do not consider yourself a US Person, but have lived in the US.
Usefull Forms