Tax and Accounting Terminology

Annual Investment Allowance

Also known as: AIA

Definition

Annual Investment Allowance is a UK capital allowance that can give a deduction for qualifying plant and machinery expenditure within the applicable limit and conditions.
Author:
Sorbus Finance
Reviewed by:
Arran Turner, 11 November 2026
Published:

How annual investment allowance works

Eligibility depends on the business, asset and chargeable period. Restrictions can apply to groups, related businesses and certain assets; disposal can also have tax consequences. The relevant current rules should be checked rather than relying on a historic limit.

Practical UK business example

A business planning several equipment purchases asks its accountant how they interact with its available allowance and accounting period before deciding the purchase timing.

Illustrative example only; not a finance quotation or a client case study.

Why it matters

It can affect the timing of tax relief and therefore the investment’s cash impact.

Limitations and common misconceptions

It does not cover every kind of capital spending and should not be assumed to apply to business cars or to every leased asset. A tax deduction does not pay the finance instalments.

Explore asset finance to discuss how the structure relates to your business.

Further reading from Sorbus Finance

References

  1. GOV.UK: Annual Investment Allowance
  2. GOV.UK: capital allowances

This definition is general information for UK businesses, not personal advice. Lender criteria and product terms vary. Sorbus Finance is a broker, not a lender.

Related finance resources (1)
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