What is year end?

Year end is the last day of a business's accounting period, the date its annual accounts are drawn up to. A company's is set when it is formed; a sole trader's is commonly 31 March or 5 April.

A plain-English definition for UK small businesses, not tax advice. Where a figure changes at a Budget, check gov.uk or ask your accountant.

LAST REVIEWED 29 AUGUST 2026 · BIZZLE

What happens at year end?

The books are closed at that date and the year's figures are fixed. Everything up to it belongs to this year's accounts and tax; everything after belongs to next year's. Invoices raised, bills received, stock counted, and bank balances are all taken as at that day.

Then the adjustments. Accruals for costs incurred but not yet billed, prepayments for things paid in advance, depreciation on equipment, bad debts written off, and a stock valuation. These are what turn a list of transactions into a set of accounts, and they are mostly the accountant's work.

For a company, the accounting reference date is set at incorporation as the last day of the month the company was formed in, and can be changed. It drives the filing deadlines: accounts to Companies House within nine months of the year end, Corporation Tax paid nine months and one day after it, and the return filed within twelve months. For a sole trader, year end matters less since tax is now assessed on the tax year, but accounts still have to be made up to a date.

A worked example

A limited company with a 31 March year end. In the last week of March the director sends every outstanding invoice, so the sales land in this year, and chases the debtors, so the balance sheet looks like what it is. On 31 March she counts stock: £4,200 at cost.

In April the bookkeeper posts the adjustments. An electricity bill for February and March arrives on 12 April for £600 and is accrued into the March accounts. The annual insurance of £1,200 paid on 1 January has nine months to run, so £900 is carried forward as a prepayment. Depreciation of £2,000 on the van is charged. The trial balance is then handed to the accountant, who prepares the accounts for filing by 31 December and the Corporation Tax return with tax due by 1 January.

What makes a year end painful?

  • A bank reconciliation that has not been done since the last one, so the year's starting point is unknown.
  • Receipts in a drawer rather than against transactions, so the expense claims are guesses.
  • Money moved between the director and the company with no record of which way or why.
  • Stock never counted, so the cost of sales is invented.
  • Starting in the ninth month, when the deadline is what forces it rather than the calendar.

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COMMON QUESTIONS

Questions people ask.

Can I change my company's year end?

Yes, by notifying Companies House. It can be shortened as often as you like and lengthened, to a maximum of eighteen months, usually only once in five years. Changing it moves every filing deadline, so check the new dates before you do.

What is the best year end for a small company?

One that falls in a quiet trading month, so the stock count and the invoicing push do not collide with the busiest fortnight of the year. Many choose 31 March to line up with the tax year, which keeps the company's and the director's affairs on the same calendar.

Does year end mean I have to stop trading for the day?

No. Business carries on; year end is a bookkeeping cut-off, not a pause. What matters is that transactions are dated accurately either side of it, and that anything physical, like stock, is counted as close to the date as possible.

How long after year end do I have to do the accounts?

For a company, the accounts must reach Companies House within nine months, and the Corporation Tax is due a day later than that. For a sole trader, the figures feed the Self Assessment return due the following 31 January. Both are the last date, not the target.

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