UK Tax Deadlines for Self-Assessment, Self-Employed & Landlords
Missing a tax deadline can result in automatic penalties from HMRC.
This page outlines the key UK tax deadlines for:
- Self-Assessment tax returns
- Self-employed individuals
- Landlords
- Making Tax Digital (MTD)
- Payment deadlines
Prepared by experienced UK accountants at Vales Accounting.
Self-Assessment Tax Return Deadlines
If you need to file a Self-Assessment tax return, the key deadlines are:
5 October
Register for Self-Assessment (if required) following the end of the tax year.
31 October
Deadline for submitting a paper tax return.
31 January
Deadline for submitting your online Self-Assessment tax return.
This is also the deadline for paying:
- Any tax owed for the previous tax year
- Your first Payment on Account (if applicable)
This is the most important deadline for most individuals.
Late submission results in automatic penalties.
Self-Assessment Payment Deadlines
If you owe tax, the key payment deadlines are:
31 January
- Balance payment for the previous tax year
- First Payment on Account for the current year
31 July
- Second Payment on Account
Penalties for Missing the 31 January Deadline
If you miss the filing deadline:
- £100 automatic penalty (even if no tax is due)
- Additional penalties after 3 months
- Further penalties after 6 months
- Further penalties after 12 months
Interest also accrues on unpaid tax.
Early preparation reduces stress and risk.
Making Tax Digital (MTD) Deadlines
If you are affected by Making Tax Digital, you may need to submit:
- 4 quarterly updates
- 1 final declaration
Quarterly deadlines vary depending on your reporting period.
Under MTD, missing deadlines can lead to points-based penalties.
Structured oversight becomes more important under quarterly reporting.
Deadlines for the Self-Employed
If you are self-employed, your key obligations include:
- Registering by 5 October (if newly self-employed)
- Filing by 31 January
- Paying tax by 31 January and 31 July
- Complying with MTD if eligible
Self-employment income must be reported accurately and on time.
Deadlines for Landlords
If you receive rental income:
- Register for Self-Assessment if required
- File by 31 January
- Pay tax by 31 January and 31 July (if applicable)
- Comply with MTD if above income thresholds
Rental income reporting errors can result in penalties and enquiries.
Tax Year Dates to Remember
The UK tax year runs from:
- 6 April to 5 April the following year.
Your Self-Assessment return covers income earned during that period.
Why Filing Early Is Smarter
Many people wait until January.
This often leads to:
- Rushed submissions
- Missed deductions
- Stress
- Higher risk of error
Filing early allows:
- Proper review
- Tax planning opportunities
- Payment preparation
- Reduced anxiety
Professional oversight helps you stay ahead of deadlines.
How Vales Accounting Helps You Stay Compliant
We support clients across the UK with:
- Self-Assessment preparation & submission
- Structured monthly tax support
- Making Tax Digital compliance
- Deadline monitoring
- Payment planning
- Professional guarantees
Avoid last-minute stress.
Frequently Asked Questions About UK Tax Deadlines
What happens if I miss the Self-Assessment deadline?
Can I file my tax return early?
What is Payment on Account?
Do Making Tax Digital deadlines replace 31 January?
Don’t Leave Your Tax Until January.
Deadlines don’t move. Preparation can.
Work with experienced UK accountants to ensure your Self-Assessment and MTD obligations are handled properly.
