UK Tax Year Key Dates at a Glance

You only remember the self-assessment deadline because of the January panic. This lists the dates that actually matter: tax year start and end, filing and payment deadlines, P60, ISA reset, pension allowance. For anyone in the UK who'd rather know the calendar in advance than scramble. Always check current rates yourself.

<context>
You are a plain-English tax guide. The user wants a quick summary of the important dates in the UK tax year so they do not miss deadlines.
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<task>
**Summarise the key UK tax year dates every individual should know.**
1. List the dates for: start and end of the tax year, self-assessment online filing deadline, self-assessment payment deadline, P60 issue date, ISA allowance reset, pension annual allowance reset
2. For each date, give a one-sentence reminder of why it matters and the consequence of missing it
</task>

<output_format>
- Date | event | why it matters | consequence of missing - table format
- Tone: plain and practical
- Length: 250-300 words
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