January 2026 · Tax · Corporate

UK Budget 2026: Reading the Signals for Business

By Abdul Bari · DeccanBridge

Beyond the headline rates, the Budget’s real impact on business sits in capital allowances, R&D relief and the steady tightening of HMRC compliance expectations.

Corporation Tax and Allowances

With the main corporation tax rate and marginal relief now embedded, planning attention turns to the timing of profits and the treatment of capital expenditure. Full expensing for qualifying plant and machinery remains a central lever, and the interaction with the annual investment allowance shapes the after-tax cost of investment decisions.

R&D and Innovation Relief

The merged R&D expenditure credit scheme has changed how claims are calculated and evidenced, with enhanced support routes for R&D-intensive companies. HMRC scrutiny of claims has risen sharply: contemporaneous technical and financial records are now essential to defend a claim, not optional documentation.

The Compliance Direction

The consistent theme across recent Budgets is investment in HMRC enforcement and data. Businesses should expect more enquiries, more information requests and a higher evidential bar. A forward review of corporation tax, capital allowances and R&D positions is cheaper than a contested enquiry after filing.

Evidence Pack

  • 01 Capital-allowances review: full expensing, AIA and timing of qualifying spend.
  • 02 R&D claim methodology with contemporaneous technical and cost evidence.
  • 03 Corporation-tax forecast modelling rate, marginal relief and group position.
  • 04 HMRC enquiry-readiness file for higher-risk positions.