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Seasonal UK planning

Self Assessment Deadline Planning Checklist

A UK seasonal checklist for organising Self Assessment records, checking the usual October, January and July dates, and planning an entered tax-payment cash flow.

The Self Assessment cycle is easier to manage when records, a taxable-profit forecast and the payment dates are visible before the deadline period. The usual dates can vary in application, so your HMRC account and notices remain the authoritative source.

Use this page to organise questions and cash flow. It does not register a business, complete a tax return or decide whether payments on account apply.

Use the right inputs

Four useful checks

1

Organise records and the recurring cycle

Review income, expense, accounting-method, profit-forecast and deadline prompts without putting sensitive details into the browser.

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2

Estimate a tax reserve

Model a stated profit forecast and exclusions, then keep a current-year reserve separate from potential payments on account.

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3

Map January and July cash dates

Use figures from the return or HMRC account to make a balancing payment and any payments on account visible.

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4

Put the tax cash into the household budget

Treat a known tax payment as a planned cash commitment alongside monthly and annual bills.

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Before the deadline or decision

  • Check whether you need to tell HMRC by 5 October, particularly if you are new or returning to Self Assessment.
  • Paper returns are usually due by 31 October; online returns and payment are usually due by 31 January, with a 30 December cut-off in some tax-code cases.
  • Check whether a 31 July payment on account applies in your HMRC statement; it is not a universal or extra tax charge.
  • If an amount cannot be paid on time, contact HMRC early and seek appropriate support rather than leaving the issue until the deadline.

Questions about this seasonal check

What are the usual online filing and payment dates?

For the normal cycle, the online return and payment are usually due by 31 January after the tax year. Check HMRC’s current deadline page and your account for the applicable date.

Why is there a July date?

31 July is normally the second payment-on-account date for people who are required to make those advance payments. The HMRC statement shows whether it applies.

Can I use a forecast instead of records?

A forecast is useful for a cash reserve but not a substitute for complete records and the return. Update it from actual income and expenses as the tax year closes.