Key Phone Numbers
| Enquiry Type | Phone Number | Opening Hours |
|---|---|---|
| Income Tax (PAYE) | 0300 200 3300 | Mon–Fri 8am–6pm |
| Self Assessment | 0300 200 3310 | Mon–Fri 8am–6pm |
| National Insurance | 0300 200 3500 | Mon–Fri 8am–6pm |
| Tax Credits | 0345 300 3900 | Mon–Fri 8am–6pm |
| Online services helpdesk | 0300 200 3600 | Mon–Fri 8am–6pm |
Calls are charged at the local rate.[1]
Best time to call: Lines are quietest mid-morning (after 10am) and mid-week (Tuesday to Thursday). January is the busiest month — avoid calling in the last week before the Self Assessment deadline.
Online Options
Many queries can be resolved faster online:[1]
- Personal Tax Account — check tax codes, claim refunds, update details
- Business Tax Account — manage Self Assessment, payments, authorisations
- HMRC webchat — available for some enquiry types via GOV.UK
- HMRC app — check tax codes and estimates on your phone
Writing to HMRC
If you need to write, use the correct address for your enquiry type. Always include your:[2]
- Full name and address
- National Insurance number or UTR
- Reference number for any ongoing case
Postal addresses vary by department — check GOV.UK for the right one.
Making a Complaint
If you’re unhappy with HMRC’s service, you can:[1]
- First: raise a formal complaint with HMRC
- If unresolved: escalate to the Adjudicator’s Office
- Final step: contact the Parliamentary Ombudsman (through your MP)
Using a Tax Agent
If you’d rather not deal with HMRC directly, you can authorise a tax agent (accountant or tax adviser) to act on your behalf.
Frequently Asked Questions
What is the HMRC Self Assessment phone number?
The Self Assessment helpline is 0300 200 3310, open Monday to Friday 8am to 6pm. Calls are charged at the local rate.
What is the best time to phone HMRC?
Lines are quietest mid-morning after 10am and mid-week (Tuesday to Thursday). January is the busiest month, so avoid calling in the last week before the Self Assessment deadline.
Can I contact HMRC online instead of phoning?
Yes. You can manage most queries through your Personal Tax Account or Business Tax Account online. HMRC also offers webchat for some enquiry types and a mobile app for checking tax codes and estimates.
Further Reading
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Sources
- Contact HMRC — GOV.UK
- Income Tax: general enquiries — GOV.UK
- Self Assessment: general enquiries — GOV.UK
- HMRC online services helpdesk — GOV.UK