Self Assessment Deadlines
Key dates for filing and payment. Missing these can mean automatic penalties, so plan ahead.
Articles
Payment on account explained
Two advance payments towards next year's bill, due 31 January and 31 July. When they apply and how they work.
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31 January deadline explained
The most important date in the Self Assessment calendar. What you need to submit, when to pay, and what happens if you miss it.
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Late filing penalties
How late filing penalties build up: the £100 immediate fine, daily penalties, and 6 and 12 month escalations.
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