Personal admin
When is Self Assessment deadline 2027?
Less deadline drama. More ready-to-file.
Self Assessment deadline: Sunday, 31 January 2027.
Filing and payment deadlines can differ. Check your own deadlines with HMRC.
Date source: GOV.UK
A one-off copy of the date shown here. No account needed. It includes a calendar alert one day before; your calendar app controls how alerts appear. Downloaded files do not update automatically.
A little head start
Make it your own
Keep the Self Assessment deadline in view while you prepare your return.
Check which filing and payment deadlines apply to you.
Gather your records before you sit down to file.
Use your HMRC account for your individual position.
Keep it with your other dates
Save this occasion in Lidley, then choose whether to include it in your calendar.
In your calendar
Connect your Lidley calendar to your calendar app. Dates you include appear there, and your app checks for updates. Changes may take time to appear.
By text, if you choose
SMS reminders are separate from calendar alerts. If SMS is available on your account, enable it in Settings and choose when to be reminded. Your mobile number must be verified.