How to Contact HMRC Self Assessment by Phone in the UK (Updated 2025)

October 25, 2025

Filing your Self Assessment tax return can be confusing and when questions arise, sometimes you just need to speak to a real person. While HMRC offers a wide range of online services, there are times when calling is the fastest way to get clarity or resolve an issue.

Here’s everything you need to know about contacting HMRC’s Self Assessment team by phone, including the correct contact numbers, timings, and helpful call tips.

HMRC Self Assessment Contact Number

If you need to speak to HMRC about your Self Assessment, you can contact them using the details below:

Inside the UK: 0300 200 3310
From outside the UK: +44 161 931 9070

These numbers connect you directly with HMRC’s Self Assessment advisors who can assist with:

Registering for Self Assessment or checking your UTR (Unique Taxpayer Reference)
Problems signing into your HMRC online account
Understanding your tax bill or refund
Setting up a payment plan (Time to Pay arrangement)
Correcting errors on your submitted return
General queries about deadlines or penalties

HMRC Opening Hours

As of 2025, the Self Assessment helpline operates during the following hours:

Monday to Friday: 8am to 6pm
Saturday, Sunday, and Bank Holidays: Closed

Tip: Try calling early in the morning (around 8am) or mid-week to avoid long waiting times. Mondays and Fridays are typically the busiest.

Before You Call HMRC

To make your call as smooth as possible, have these details ready:

Your 10-digit UTR (Unique Taxpayer Reference)
Your National Insurance Number
Your full name, address, and date of birth
Details of your query (e.g. payment reference, tax year in question)
Access to your HMRC online account if you need to verify or cross-check information

Being prepared ensures your identity can be verified quickly and helps resolve your issue faster.

Alternative Ways to Contact HMRC

If calling isn’t convenient, HMRC offers several alternative contact options:

1. Online Services

Check your tax bill or payment due
Make payments online
View deadlines and previous returns
Update your contact details

2. Webchat

HMRC sometimes provides a webchat option for Self Assessment queries during working hours. You can access it through the HMRC contact page.

3. By Post

You can write to: Self Assessment, HM Revenue and Customs, BX9 1AS, United Kingdom

Include your UTR, full name, and a clear explanation of your issue. Avoid sending original documents unless specifically requested.

Common Reasons to Call HMRC

You might need to contact HMRC by phone if:

You’ve missed the Self Assessment filing or payment deadline
You need a Time to Pay arrangement for overdue tax
You’ve received an unexpected letter or penalty notice
You’re unsure whether you still need to file a return
You’ve had trouble accessing your online account

Key Self Assessment Deadlines

Register for Self Assessment: 5 October after the tax year ends
Submit online tax return: 31 January
Pay any tax owed: 31 January
Second payment on account (if applicable): 31 July

Reaching out to HMRC before these dates helps you avoid fines and interest charges.

Beware of Scams

HMRC will never ask for your bank details, passwords, or personal information via unsolicited emails, texts, or phone calls.
If you receive a suspicious message, report it to HMRC’s phishing team.

Frequently Asked Questions (FAQ)

1. What is the phone number for HMRC Self Assessment?

You can contact HMRC’s Self Assessment helpline on 0300 200 3310 if you’re in the UK. For calls made from outside the UK, dial +44 161 931 9070.

2. How do I contact the Self Assessment agent?

If you use an accountant or tax agent, they can contact HMRC on your behalf — but only if they are officially authorised. You can authorise your agent through your HMRC online account under the “Manage who can deal with HMRC for you”

3. How do I report a fake HMRC letter or scam?

If you suspect you’ve received a fake HMRC letter, email, or phone call:

Email scams: Forward to phishing@hmrc.gov.uk
Suspicious texts: Forward to 60599
Fake phone calls: Report online at https://www.gov.uk/report-suspicious-emails-websites-phishing

Never share personal details or bank information before verifying the contact source.

Final Thoughts

The HMRC Self Assessment helpline remains a reliable way to get direct help from a real advisor. However, due to long queues especially in January it’s always wise to explore online tools first. If you find managing your Self Assessment stressful or time-consuming, consider getting help from a qualified accountant. They can handle your filings, liaise with HMRC on your behalf, and ensure your taxes are submitted accurately and on time.