What it means
A business is a continuous flow of activity, but owners, lenders, investors and tax authorities need results at regular intervals. The accounting period is the device that chops the flow into comparable slices.
Everything about period-end accounting, from accruals and prepayments to depreciation charges and closing entries, exists to assign revenue and costs to the right slice. The most important period is the financial year, sometimes called the fiscal year.
It does not have to match the calendar year. Retailers often end their year in late January, after the holiday season and the returns that follow it.
Governments and universities frequently use years ending 30 June or 31 March. A company chooses a year end that falls in a quiet part of its cycle, when inventory is low and staff are available to do the closing work, and then keeps it, because changing it later requires regulatory approval and produces an awkward short or long period that is hard to compare.
Within the year, management accounts are usually prepared monthly. Some businesses, particularly retailers, use a 4-4-5 calendar, which divides each quarter into two four-week months and one five-week month so that every period has the same number of trading days and weekends.
This makes month-to-month comparisons cleaner at the cost of a 52-week year that occasionally needs a 53rd week added. The concept matters beyond bookkeeping.
The matching principle, which says expenses should be recognised in the same period as the revenue they helped generate, only has meaning once periods are defined. Cut-off, the discipline of recording transactions in the correct period, is one of the first things auditors test: a sale invoiced on 2 January but shipped on 30 December belongs in the old year, and a company that pulls next year's sales into this year is misstating both.
In practice
Real-world examples.
Example
A US retailer's fiscal year runs from 1 February to 31 January so that the year end falls after the holiday sales peak and the January returns.
Example
A listed technology company reports quarterly to the stock exchange, with each quarter's results compared with the same quarter a year earlier to remove seasonal effects.
Example
A restaurant chain uses 13 four-week periods a year so that every period contains exactly four of each weekday and weekend, making labour and sales comparisons like for like.
Think of it
“An accounting period is the time chunk you're measuring-a month, quarter, or year.
Formula
Calculation
Accounting periods are not calculated, but allocating a cost across them is.
Worked example. A company with a 31 December year end pays $24,000 on 1 October for a twelve-month insurance policy.
- Monthly cost = $24,000 / 12 = $2,000
- Months falling in the current year (October to December) = 3
- Expense for the current period = 3 x $2,000 = $6,000
- Prepayment carried to the next period = 9 x $2,000 = $18,000
The income statement for the year shows $6,000 of insurance expense and the balance sheet shows an $18,000 prepaid asset. Next year the $18,000 is released to expense at $2,000 a month. Cash of $24,000 left the business in one period; the cost is spread across two.
A 4-4-5 quarter for the same company would run: period 1 of 4 weeks (28 days), period 2 of 4 weeks (28 days), period 3 of 5 weeks (35 days), totalling 91 days, so four quarters give a 364-day year and every seventh year or so needs a 53-week adjustment.Case study
Seen in the real world.
A furniture importer had a 31 December year end that coincided with its busiest shipping season. Every January the finance team spent three weeks counting containers, chasing shipping documents and estimating goods in transit, and the audit dragged into April because cut-off was so hard to establish. The owner applied to change the year end to 30 April, the quietest month, and accepted one awkward 16-month transition period.
The first April year end closed in eight working days. The audit finished in June with no cut-off adjustments for the first time in the company's history, and the audit fee fell by a fifth because the auditors spent far less time testing goods in transit. The transition period was messy to explain to the bank, but the owner considered one difficult year a small price for every year after it being easier.
Watch out
Common mistakes.
- Recording a transaction in the period the cash moved rather than the period the goods or services were delivered. Cut-off errors distort two periods at once.
- Comparing a five-week period with a four-week one and drawing conclusions about growth. Always compare like with like, or use daily averages.
- Changing the year end without planning for the transition period, the tax consequences and the loss of comparability.
Questions
People also ask.
What is the difference between a fiscal year and a calendar year?
A calendar year runs 1 January to 31 December. A fiscal year is any twelve-month period a business chooses for reporting, which may or may not be the calendar year.
Can an accounting period be longer or shorter than a year?
Yes, usually only once, when a business starts, changes its year end or is wound up. Regulators typically limit the length of such periods.
Why do businesses prepare monthly accounts if the legal requirement is annual?
Because waiting a year to discover a problem is too long. Monthly periods give managers timely feedback and make the annual close far easier.
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