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Definition
An accounting period is the span of time a set of accounts covers — normally twelve months for a limited company. It sets the clock for filing accounts and paying corporation tax.
In plain terms
It is your financial year. Your first one can be shorter or longer, and it fixes when your accounts and tax return are due — nine and twelve months after it ends respectively.
Why it matters for your company
The accounting period drives every deadline: corporation tax payment and filing, and Companies House accounts. Aligning capital spend and reliefs to the period — see capital allowances — affects the tax you pay.
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