HMRC confirms helpline will be open on self assessment deadline day 30 Jan 2026HMRC has announced today that the helpline for self assessment queries will now be open from 9am to 4pm on Saturday 31 January 2026. This is in addition to the webchat support previously announced. Saturday 31 January 2026 is the deadline for filing a self assessment return for the 2024/25 tax year. HMRC says that although there will now be additional support available on deadline day, anyone yet to file should take action sooner rather than later to avoid late filing penalties. HMRC said: 'Guided by our Charter commitments, we want to do everything we can to help all our customers file on time. So, we have bolstered our support to ensure every customer can get the help they need on deadline day – with over 9 million customers already filed, we're confident self assessment is on track. 'In addition to our enhanced webchat capacity, our phone helplines will also be open from 9am to 4pm on Saturday 31 January to provide self assessment support. 'Digital services remain the fastest route to help. The phone line provides an additional safety net for customers who need to speak to someone.'