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Do I need to file a Self Assessment?

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Plain-English guidance for UK taxpayers. We help you understand what HMRC needs from you and how to do it yourself. You complete your own return on GOV.UK, and nothing you enter here is ever sent to HMRC.

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Self Assessment

Do I need to file?
Tax return walkthrough
Amend a tax return you have sent
Explain my tax calculation
CIS: construction industry subcontractors
Capital gains: sold something at a profit
Partner in a business partnership
Payments on account
Making Tax Digital
Stop Self Assessment or close your record
Key dates and reminders

Tax code decoder

Decode my tax code
Coding notice breakdown
Marriage Allowance
High Income Child Benefit Charge
Gift Aid and charity donations
P87: work expenses
Payslip checker
P11D and benefits in kind
Company car calculator
State Pension and your tax code

Underpayments

Underpayments explained
In-year adjustment calculator
Payslip checker
Coding notice breakdown
P11D and benefits in kind

Simple Assessments

Simple Assessment decoder
State Pension and your tax code
Underpayments explained
Key dates and reminders

Pensions

Pension lump sums and the tax taken off
Private pensions and PAYE
State Pension and your tax code
Pension refund forms
P55: pot not emptied
P53Z: pot emptied, other income
P50Z: pot emptied, no other income
P53: small pot or trivial commutation
P50: stopped work, no pension
Which refund am I due?

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