Contacting HMRC

Help meContacting HMRC

Taxes Helpline – 0845 300 0627
Please have your National Insurance number with you when you phone
Opening hours
8.00 am to 8.00 pm, Monday to Friday
8.00 am to 4.00 pm Saturday

For customers who are deaf or hearing or speech impaired: 0845 302 1408 (Textphone)

If your tax code is wrong

Cox & Co’s systems are directly updated by HMRC. If your tax code is wrong, as an employee you will need to contact HMRC straight away so they can correct it.

HMRC will need to know your tax reference and National Insurance number. Look for these numbers on your payslips, P60 or Coding Notice.  Your employer will have their Tax Reference number on their PAYE Remittance advice.


For further help contacting HMRC, advice on HMRC Employer Database or understanding the payroll calendar contact: