Today marks a significant development in HMRC’s approach to tax certainty for major investors. The Advance Tax Certainty Service officially opens for expressions of interest from 1 June 2026, with the full service launching on 1 July 2026. For CFOs involved in large-scale UK investment projects, this represents a genuine shift in how HMRC engages with strategic tax planning.
What Is the Advance Tax Certainty Service?
The service provides binding tax clearances for businesses undertaking major UK investment projects. Unlike HMRC’s existing non-statutory clearance regime — where responses are essentially opinions that can be revisited — clearances issued under this new service are legally binding on HMRC for up to five years, with the possibility of a further five-year renewal.
The scope covers most major UK taxes: Corporation Tax, VAT, Stamp Duty Land Tax, Income Tax, PAYE, and the Construction Industry Scheme. Full details are on the GOV.UK guidance page.
The £1 Billion Threshold
This is not a service for the average mid-market deal. The qualifying expenditure threshold is £1 billion over the lifetime of the project. That immediately positions this as a tool for infrastructure developers, energy companies, large-scale manufacturing, and similar capital-intensive sectors.
For PE-backed portfolio companies, the threshold will rarely be met at the individual entity level. However, for consortium deals, joint ventures, or platforms aggregating spend across multiple related investments, the picture may be different. CFOs should consider whether project-level structuring could bring qualifying expenditure above the line.
How It Works: The Five-Step Process
The application process is structured but not overly bureaucratic:
1. Expression of Interest — Contact advancetaxcertainty@hmrc.gov.uk or your Customer Compliance Manager. This is now open.
2. Early Engagement Meeting — Optional but recommended. An informal discussion to scope the project and identify tax uncertainties worth clarifying.
3. Written Clearance Request — A formal submission setting out the facts, the tax position, and the specific clearance sought.
4. Scoping Meeting — HMRC agrees what’s in and out of scope. This is where the negotiation happens.
5. HMRC Review and Issuance — Target turnaround is 90 days from formal submission. That’s aggressive by HMRC standards and represents a genuine commitment to speed.
What’s Excluded
The service has clear boundaries. HMRC will not provide clearances on:
- Transfer pricing — still handled through Advance Pricing Agreements under existing processes
- Asset valuations — HMRC won’t bind itself to a valuation position
- Hypothetical scenarios — the project must be real and committed
- Purpose tests — though HMRC may indicate low compliance risk around loan relationship and derivative unallowable purpose rules
- Broad anti-avoidance — the General Anti-Abuse Rule and targeted anti-avoidance rules remain outside scope
Where existing statutory clearance mechanisms already cover a point (e.g., Section 748 CTA 2010 for reconstructions), HMRC will direct applicants there instead.
Why This Matters for CFOs
The UK has long been criticised for offering less tax certainty than competitor jurisdictions. Countries like the Netherlands, Ireland, and Luxembourg have provided binding rulings for decades. The OECD’s work on tax certainty has consistently highlighted this gap.
From a CFO’s perspective, binding certainty on tax treatment de-risks major investment decisions. When you’re presenting a £1bn+ capex case to a board or investment committee, being able to say “HMRC has confirmed the tax position in writing, and it’s binding for five years” is materially different from “our advisers think this is the position.”
The Deloitte analysis rightly notes this could influence location decisions for major projects — exactly the government’s intention. The Spring Budget 2025 announcement that accompanied this service was explicitly framed around attracting foreign direct investment.
The Confidentiality Angle
One detail worth noting: clearances will not be published. This is a deliberate design choice. HMRC doesn’t want a public database of binding rulings that could be cited by other taxpayers in different circumstances. It also avoids the political sensitivity that has surrounded tax rulings in other jurisdictions (see the EU State Aid investigations into Apple, Starbucks, and Fiat).
For businesses, confidentiality is generally a positive — your competitors won’t see your tax structuring. But it also means there’s no transparency about how HMRC is interpreting the rules, which could create inconsistency over time.
Practical Considerations
If your project is anywhere near the qualifying threshold, here’s what to do now:
- Register your interest early. HMRC is likely to manage capacity carefully in the first year. Being in the queue matters.
- Map your tax uncertainties. The more specific your clearance request, the faster it’ll be processed. Vague “please confirm our structure works” submissions will be bounced.
- Engage your CCM. If you already have a Customer Compliance Manager, they’re the fastest route in. HMRC’s CCM contact page has details.
- Consider the timeline. 90-day target from formal submission, plus scoping meetings and early engagement. Budget 4-6 months for the full process.
The Bigger Picture
This service sits alongside other recent moves to improve the UK’s attractiveness for investment: full expensing of plant and machinery, the Spring Budget 2025 R&D reforms, and enhanced capital allowances for freeport and investment zone sites.
Whether it genuinely moves the needle on FDI remains to be seen. The £1bn threshold excludes the vast majority of businesses. But for those in scope, having HMRC commit in writing — and be bound by that commitment — is a meaningful step forward.
For more on how tax certainty fits into your CFO toolkit, or to discuss how this might apply to your projects, get in touch with Tanous.