UK Budget 2026: Separate Allowance Proposals from Enacted Tax Measurements
The Budget's allowance and surcharge measures must be checked against Finance Bill enactment. Announcement alone is not a standard enacted-rate event.
Editorial source review — November 1, 2026. This machine-generated article has been reviewed, but is not certified accurate. Source-backed corrections are incorporated where established. Other legal, survey and product claims may remain unverified; check applicable primary authorities before relying on a deadline or tax position.
Findings in the original version: GOV.UK OOTLAR describes measures for Finance Bill 2026-27, not automatic Royal Assent. “Standard enacted-rate event” contradicts that status; faster tax depreciation does not automatically create DTAs.
The official Budget 2026 OOTLAR describes measures to be introduced in Finance Bill 2026-27. A Budget announcement is not, by itself, evidence of Royal Assent. The original description of all the measures as a “standard enacted-rate event” was incorrect.
Identify the measure, status and effective date
The published proposals include reducing the main writing-down allowance from 14% to 12% from April 2027, increasing the relevant first-year allowance from 40% to 50% from January 2027, and a temporary bank-surcharge change. Check each measure's scope, commencement and actual legislative progress rather than applying one date or rate to every company.
Timing changes are not automatically rate changes
Changing the timing of tax depreciation at an unchanged tax rate does not automatically remeasure every deferred-tax balance. Tax depreciation faster than book depreciation generally produces a taxable temporary difference, not automatically a DTA. A declining-balance pool also does not mathematically become exactly zero after a fixed thirty-year period.
Provision controls
Maintain separate current-law and proposal scenarios. Determine the recognition trigger under the reporting framework actually used; US GAAP enactment and other frameworks' substantive-enactment analysis are not interchangeable. Check the final legislation before booking a measure as enacted.