Autumn Budget 2026: UK small-business tax and NI checklist

What is confirmed before Autumn Budget 2026?

Autumn Budget 2026 is scheduled for 28 October 2026 [1]; its new measures cannot be presented as confirmed beforehand. Build a current-rules baseline for your business, then distinguish tax rules from survey evidence. The figures below describe different scopes and periods, so they are not forecasts of your Budget impact.

In my published work, I connect acquisition, retention, pricing and profitability [8]. That makes the whole operating picture the starting point for preparation.

Which Budget and tax dates should you track?

The Budget timeline separates the announcement from the dates existing or future rules apply. Current employer rates cover 6 April 2026 to 5 April 2027 unless stated otherwise [2]. Record each confirmed measure’s actual effective date after publication; the Budget date itself does not establish when every policy takes effect.

Why should you separate business surveys from Budget measures?

Operating-cost concern was reported by 47% in iwoca’s 2026 SME Outlook, as covered by Startups Magazine [6]. This commercial survey supports the preparation context, alongside official rates and central-bank evidence. It does not establish a future tax change, your own costs or a causal effect of the forthcoming Budget.

How can you prepare a Budget impact plan?

A Budget impact plan starts with the current payroll baseline, including standard category A employer NI of 15% in 2026/27 [2]. Identify which costs apply to your business and assign a reviewer for each policy area. After publication, update only the inputs supported by the official measure, scope and effective date.

1. Gather baseline records.
2. Record existing rules, eligibility and source links.
3. Map confirmed measures to the affected business inputs.
4. Review cash timing.

My published ecommerce framework includes profitability [8]. Apply that discipline by reviewing marketing contribution alongside payroll, tax and premises costs.

Which tax and business-rates assumptions need a separate check?

Corporation Tax has a 25% main rate in 2026 [3], with small-profits and marginal-relief rules that depend on the company’s circumstances. Associated companies and shorter accounting periods can reduce the relevant limits [9]. Check the calculation rather than applying a headline rate to every company, and review premises relief under the correct national rules.

The GOV.UK business-rates relief guide covers England and links to different rules for Scotland, Wales and Northern Ireland [7]. A UK Budget headline does not determine each property’s relief eligibility.

What should your Budget preparation checklist contain?

Your preparation checklist should record the baseline and the evidence needed to evaluate the Budget scheduled for 28 October 2026 [1]. Keep payroll, company-tax, premises and cash-flow questions separate, with an owner for each. Mark unannounced measures as unavailable, then add the official scope and effective date when the documents are published.

• Current payroll category, thresholds and allowances.
• Company-tax calculation and eligibility questions.
• Premises bill and applicable national relief rules.
• Cash timing, contracts and planned commitments.
• Policy source, effective date and review owner.

Where can you record Budget changes?

Use a working impact record to compare existing rules with the official measures after the 28 October 2026 Budget [1]. Record the policy source, affected cost, effective date and action owner. The downloadable checklist provides those fields without inventing future rates, savings or a personal forecast for your business.

Download the Budget impact checklist (PDF). For another confirmed reporting change, read our Making Tax Digital guide.

What should owners ask before the Budget?

Pre-Budget questions should start with what is confirmed: the announced date is 28 October 2026 [1]. New measures need the official documents before they can be assessed. These answers distinguish the date, existing payroll rules, company-tax calculations and premises relief, so preparation is based on verified information rather than speculation.

When is Autumn Budget 2026?

HM Treasury’s published communiqué identifies 28 October 2026 as the Autumn Budget date [1]. Before that date, this article is a preparation checklist using current rules and verified business context. Review the official Budget documents when available, then check the scope and effective date of each measure affecting your business.

Has this guide confirmed new employer NI changes?

No new Autumn Budget measure is claimed here. HMRC’s current 2026/27 guidance lists 15% employer NI for standard category A earnings above the relevant threshold [2]. Keep that baseline separate from any future announcement, and check employee categories, payroll periods and eligibility before estimating your business’s actual liability.

Does every small company pay the same Corporation Tax rate?

No: HMRC lists a 19% small-profits rate and a 25% main rate for 2026 [3]. The applicable calculation depends on profits and conditions, including marginal relief and adjusted limits [9]. Use the company’s actual circumstances rather than treating business size alone as the test for a rate.

Are business-rates relief rules the same across the UK?

The GOV.UK guidance checked in 2026 explains that its business-rates relief information covers England, with different rules for Scotland, Wales and Northern Ireland [7]. Check the property’s nation and applicable authority. Keep your current bill and relief evidence available rather than assuming a Budget headline determines eligibility.

Which Budget sources are used?

The source hierarchy puts official tax rules ahead of survey context. HMRC lists a 19% small-profits Corporation Tax rate for 2026 [3], subject to the applicable conditions. Treasury and HMRC sources support dates and rules; Bank of England, FSB and iwoca evidence describe different business populations and measures, with the commercial survey used only as support.

1. HM Treasury: Budget date — Budget date. Tier 1.
2. HMRC: Employer rates 2026/27 — Payroll. Tier 1.
3. HMRC: Corporation Tax rates — Rates. Tier 1.
4. Bank of England: September 2026 DMP — Firm context. Tier 1.
5. FSB: Scotland SBI Q2 2026 — UK confidence. Tier 2.
6. iwoca Outlook, via Startups Magazine — Commercial 2026 Outlook; fieldwork date unconfirmed. Tier 3.
7. GOV.UK: Business rates relief — National scope. Tier 1.
8. Satya Prakash Rai: Profile — Self-reported profitability experience. Author disclosure.
9. HMRC: Corporation Tax Marginal Relief — Adjusted limits. Tier 1.

Source values were checked on 12 October 2026. Preparation version; await official new measures. Explore related European market research.