Countdown · UK
The Self Assessment deadline 2027 is 125 days away
There are 125 days until the Self Assessment deadline on Sunday 31 January 2027, which is 17 weeks and 6 days. Counting from today, Monday 28 September 2026, that leaves 87 working days in England and Wales and 84 US federal working days once weekends and public holidays come off, and 35 weekend days.
Date
31 Jan 2027
Sunday
Calendar days
125
17 weeks and 6 days
UK working days
87
England and Wales
US working days
84
federal holidays off
Weekend days
35
18 Saturdays, 17 Sundays
UK bank holidays in the count: Christmas Day (25 Dec 2026), Boxing Day (28 Dec 2026) and New Year’s Day (1 Jan 2027).
US federal holidays in the count: Columbus Day (12 Oct 2026), Veterans Day (11 Nov 2026), Thanksgiving Day (26 Nov 2026), Christmas Day (25 Dec 2026), New Year's Day (1 Jan 2027) and Birthday of Martin Luther King, Jr. (18 Jan 2027).
Updated daily; counted from Monday 28 September 2026.
When the Self Assessment deadline is
According to GOV.UK, you must file your online Self Assessment tax return and pay the tax you owe by 11:59pm on 31 January after the end of the tax year. For the 2025 to 2026 tax year, that is 31 January 2027. Paper returns are due earlier, by 31 October.
Why the date moves
The deadline is a fixed date, 31 January, and GOV.UK gives it as 31 January 2027 even though that is a Sunday. The first payment on account for the next tax year is due on the same day.
Public holidays before the Self Assessment deadline
Between today and Sunday 31 January 2027, the England and Wales count takes off Christmas Day (25 Dec 2026), Boxing Day (28 Dec 2026) and New Year’s Day (1 Jan 2027), and the US count takes off Columbus Day (12 Oct 2026), Veterans Day (11 Nov 2026), Thanksgiving Day (26 Nov 2026), Christmas Day (25 Dec 2026), New Year's Day (1 Jan 2027) and Birthday of Martin Luther King, Jr. (18 Jan 2027). Holidays that fall at a weekend are already out of the count.
The Self Assessment deadline dates for the next 5 years
Worked out from the rule above; days away are counted from today.
| Year | Deadline | Tax year | Paper return was due | Away |
|---|---|---|---|---|
| 2027 | Sunday 31 January 2027 | 2025 to 2026 | 31 October 2026 | 125 days |
| 2028 | Monday 31 January 2028 | 2026 to 2027 | 31 October 2027 | 490 days |
| 2029 | Wednesday 31 January 2029 | 2027 to 2028 | 31 October 2028 | 856 days |
| 2030 | Thursday 31 January 2030 | 2028 to 2029 | 31 October 2029 | 1,221 days |
| 2031 | Friday 31 January 2031 | 2029 to 2030 | 31 October 2030 | 1,586 days |
Guides and definitions
- How much notice do I need to cancel a contract or subscription? (Guide)
- Cooling-off period (A cooling-off period is the 14 days UK law gives you to cancel most contracts made online, by phone or off-premises, without a reason.)
- Notice period (A notice period is the time between telling the other party you are ending a contract and the date it actually ends.)
Days until other dates
- Black Friday (27 Nov 2026)
- Bonfire Night (5 Nov 2026)
- New Year's Day (1 Jan 2027)
- Valentine's Day (14 Feb 2027)
- Mothering Sunday (7 Mar 2027)
- Easter Sunday (28 Mar 2027)
Every countdown · Days left in the year · Days and weeks from today · Self Assessment payments on account · Count working days to any date
Common questions
How many days until the Self Assessment deadline?
There are 125 days until the Self Assessment deadline 2027 on Sunday 31 January 2027, counted from today, Monday 28 September 2026. The count includes the day itself and every weekend day in between.
How many weeks until the Self Assessment deadline?
It is 17 weeks and 6 days until Sunday 31 January 2027. That takes in 17 full weekends and 35 weekend days, counting today but not the day itself.
How many working days are there until the Self Assessment deadline?
Counting today but not Sunday 31 January 2027, there are 87 working days in England and Wales and 84 in the US. The UK figure takes off Christmas Day, Boxing Day and New Year’s Day and the US figure Columbus Day, Veterans Day, Thanksgiving Day, Christmas Day, New Year's Day and Birthday of Martin Luther King, Jr..
What day of the week is the Self Assessment deadline 2027?
The Self Assessment deadline 2027 is on a Sunday, 31 January 2027. The one after is on a Monday, 31 January 2028, 490 days from today.
Which tax year is due on 31 January 2027?
The online return and payment due on 31 January 2027 are for the 2025 to 2026 tax year, which ran from 6 April 2025 to 5 April 2026. A paper return for that year was due by 31 October 2026. The first payment on account for the next year is due the same day.
Sources and assumptions
- Calendar days: the target date minus today. Working days: Monday to Friday from today up to the day before the target date, the way the Days Between Dates calculator counts them.
- UK working days take off England and Wales bank holidays from the GOV.UK feed, including substitute days. Scotland and Northern Ireland have different bank holidays.
- US working days take off federal holidays on the day they are observed under 5 U.S.C. 6103. States and employers can add their own holidays.
- GOV.UK: Self Assessment tax returns, deadlines
- GOV.UK: UK bank holidays (England and Wales)
- 5 U.S.C. 6103: US federal legal public holidays
Dates are worked out for the UK time zone and refreshed in your browser for your own date. Your employer, court or contract may count days differently, so check the exact rule that applies to you.