Last updated: 16 October 2026
What is the Finance Bill?
When the Chancellor announces tax changes at a Budget, they are not law yet. Most changes are put into a Finance Bill, which Parliament must pass. Once it receives Royal Assent, it becomes a Finance Act. Some years there are two Finance Bills, for example a “Spring Finance Bill” after a spring Budget and a second bill later in the year.
How a Budget measure becomes law
- Budget speech: the Chancellor announces the changes. HMRC publishes policy papers and draft legislation the same day.
2. Budget resolutions: MPs vote on resolutions that allow some changes to take effect straight away under provisional collection rules.
3. Finance Bill published: usually within a few weeks of the Budget.
4. Commons stages: second reading, committee stage (some clauses on the floor of the House, the rest in a Public Bill Committee) and report stage.
5. Lords: the House of Lords considers the bill but, by convention, does not amend tax measures.
6. Royal Assent: the bill becomes the Finance Act.
Why the timing matters
| Type of measure | When it usually takes effect |
| Duty changes on fuel, alcohol and tobacco | Often from 6pm on Budget day |
| Income tax rates and allowances | From 6 April after the Budget |
| Corporation tax rates | From 1 April |
| Anti-avoidance rules | Sometimes from the date of announcement |
| Major reforms | Often a year or more later, after consultation |
Example
The Budget in November 2025 announced that the personal allowance and income tax thresholds would stay frozen until April 2031, that savings and property income tax rates would rise by 2 percentage points from April 2027, and that dividend tax rates would rise to 10.75% and 35.75% from April 2026. These measures became law through Finance Bill legislation, with each provision taking effect from its own date.
What businesses should do
- Read the Budget summary on the day, but act only once you know the start date.
- Watch for changes made during the bill’s progress, as clauses can be amended.
- Plan around confirmed dates for payroll, VAT and corporation tax changes.
- Ask your accountant how changes affect your profit extraction and payments on account.
Draft legislation and consultation
Many measures are published in draft months before the Budget, often in July, so businesses can comment. Responding to consultations is a good way for sector bodies to influence the final rules.
Retrospective changes
Tax law is rarely retrospective, but some anti-avoidance measures take effect from the date they are announced, before the Finance Act is passed. If you are planning a transaction around Budget time, check whether any announced change could apply to it.
Frequently asked questions
Can a Budget measure be dropped?
Yes. Measures can be withdrawn or changed before Royal Assent, as happened with parts of the September 2022 mini-budget.
How long does a Finance Bill take?
Usually three to four months from publication to Royal Assent.
What is a Spring Statement?
A fiscal update that may include tax measures, though most changes come at the main Budget.
Where can I read the Finance Act?
On legislation.gov.uk once it receives Royal Assent.
Related: what happens after the Autumn Statement, Spring Statement changes and what a new government means for tax.
Talk to Accotax
Want this handled for you? Our team at Accotax can help with keeping up with tax changes. See our small business accountants service, or contact us for a free, no-obligation quote.
This page is general guidance based on HMRC rules for the 2026/27 tax year, checked against gov.uk on 16 October 2026. It is not personal advice, so speak to an accountant about your own situation.
