Scope: EU / EEA
Status requires verification
Global minimum tax: Release of a common understanding of implementing jurisdictions and further administrative guidance to support compliance
OECD and EU jurisdictions (as part of Inclusive Framework) agreed a common understanding for jurisdictions implementing the Global Minimum Tax from 2024: central filing relief where GIR is filed in the UPE jurisdiction; updated administrative guidance including clarification of Transitional UTPR Safe Harbour eligibility for groups with 53-week fiscal years; updates to the Central Record of jurisdictions that have implemented QIIR and QDMTT rules.
Editorial impact label: High
- Published
- Not recorded
- Policy event
- Not recorded
- Effective
- May 18, 2026
- Verification
- Not recorded
Open cited source
Scope: United Kingdom
Status requires verification
Check if and when you need to register as a tax adviser with HMRC
UK policy requiring tax advisers who interact with HMRC on behalf of clients to register via an online agent services account. Starting from 18 May 2026, with full implementation requiring third-party payroll advisers by 18 November 2026, and financial services firms by 31 December 2026. The registration includes meeting minimum HMRC standards, including identity checks, AML compliance, and informing about suspension/ineligibility. This aims to ensure quality, regulate advisor behaviour and protect taxpayers.
Editorial impact label: Medium
- Published
- Not recorded
- Policy event
- Not recorded
- Effective
- May 18, 2026
- Verification
- Not recorded
Open cited source
Scope: Global
Status requires verification
UK mandatory tax adviser registration with HMRC begins 18 May 2026
From 18 May 2026, tax advisers in the UK who are paid to interact with HM Revenue & Customs on behalf of clients must register via the Agent Services Account, meet minimum standards, and undergo identity and in some cases AML supervision. Registration will roll out in phases through March 2027.
Editorial impact label: Medium
- Published
- Not recorded
- Policy event
- Not recorded
- Effective
- May 18, 2026
- Verification
- Not recorded
Open cited source
Scope: United Kingdom
Status requires verification
Mandatory tax adviser registration with HMRC
From **18 May 2026**, the UK requires all paid tax advisers who interact with HMRC on behalf of clients to **register with HMRC** and meet minimum standards via a streamlined digital registration process. Roll-out is phased by adviser category; failure to register may result in loss of interaction rights and potential sanctions.
Editorial impact label: High
- Published
- Not recorded
- Policy event
- Not recorded
- Effective
- May 18, 2026
- Verification
- Not recorded
Open cited source
Scope: United Kingdom
Status requires verification
UK introduces mandatory registration requirement for paid tax advisers
From May 2026, UK tax advisers who are paid to interact with HMRC on behalf of clients are legally required to register and meet minimum standards. The registration process will be primarily digital (with non-digital options for those excluded), and various tax adviser groups will have a **three-month transition period** specific to their group. This change is legislated via Finance Bill 2025-26 and aims to streamline the patchwork of existing registration systems. Non-registered advisers may be prohibited from dealing with clients’ tax affairs with HMRC.
Editorial impact label: Medium
- Published
- Not recorded
- Policy event
- Not recorded
- Effective
- May 18, 2026
- Verification
- Not recorded
Open cited source
Scope: United Kingdom
Status requires verification
Modernising and Mandating Tax Adviser Registration (MMTAR)
A new requirement for paid tax advisers who interact with HMRC to register via Agent Services Account (ASA). Roll-out phases start 18 May 2026 through to 31 March 2027 depending on adviser category. Registration conditions include identity, AML supervision, UTR, company/VAT numbers where applicable. Acting without registration or meeting standards risks sanctions.
Editorial impact label: Medium
- Published
- Not recorded
- Policy event
- Not recorded
- Effective
- May 18, 2026
- Verification
- Not recorded
Open cited source
Scope: United Kingdom
Status requires verification
Making Tax Adviser Registration (MMTAR) mandatory registration requirement rolls out from 18 May 2026
From 18 May 2026, all paid tax advisers who interact with HM Revenue & Customs on behalf of clients must register under new rules (MMTAR). Phased online registration opens 18 May 2026 and runs until 31 March 2027. Aims to raise standards, improve protections for taxpayers and formalise adviser-agent interactions. Registration is free. Exemptions apply in limited circumstances. Significant impact for tax advisors and their clients.
Editorial impact label: Medium
- Published
- Not recorded
- Policy event
- Not recorded
- Effective
- May 18, 2026
- Verification
- Not recorded
Open cited source
Scope: United Kingdom
Status requires verification
Tax advisers: check if you need to register under new rules (MMTAR)
From 18 May 2026, tax advisers paid to interact with HMRC must register under the Modernising and Mandating Tax Adviser Registration system. The rule applies to domestic and overseas advisers; rollout will continue through 31 March 2027. Registration is free; advisers need to meet identity and AML supervision requirements.
Editorial impact label: Medium
- Published
- Not recorded
- Policy event
- Not recorded
- Effective
- May 18, 2026
- Verification
- Not recorded
Open cited source
Scope: Global
Status requires verification
New Registration Requirement for Tax Advisers Who Interact with HMRC Clients (MMTAR)
From 18 May 2026, the UK is introducing a mandatory registration regime (Modernising and Mandating Tax Adviser Registration) for paid tax advisers who interact with HM Revenue & Customs on behalf of clients. It phases in in stages from May 2026 to March 2027, with advisers grouped by type (new advisers, those with existing accounts, payroll only, financial services). Registration is free, but compliance is required; the change aims to unify and raise standards in tax advice markets. Advisers failing to register when required may face penalties or restrictions.
Editorial impact label: Medium
- Published
- Not recorded
- Policy event
- Not recorded
- Effective
- May 18, 2026
- Verification
- Not recorded
Open cited source
Scope: United Kingdom
Proposed
Plastic Packaging Tax - mechanically recycled plastic packaging: Consultation
HMRC launched a consultation on potential mandatory certification requirements for plastic packaging containing mechanically recycled plastic. The consultation seeks views on evidential requirements, business impacts, scale of fraudulent claims and possible implementation timings.
Editorial impact label: Medium
- Published
- Not recorded
- Policy event
- Not recorded
- Effective
- May 18, 2026
- Verification
- Not recorded
Open cited source
Scope: Canada
Status requires verification
Carbon pricing systems across Canada: Updated headline price trajectory for industrial systems
As of May 15, 2026, the federal government updated its carbon pricing trajectory for industrial carbon pricing systems in Canada. The new trajectory sets price per tonne CO₂e starting at $95 in 2026, rising to $100 in 2027–29, increasing to $115 in 2030 and escalating to $140 by 2040 with inflation adjustments. These changes provide long-term certainty for industries, impacting cost of operations, compliance planning, and investment in decarbonization.
Editorial impact label: Medium
- Published
- Not recorded
- Policy event
- Not recorded
- Effective
- May 15, 2026
- Verification
- Not recorded
Open cited source
Scope: United Kingdom
Status requires verification
Technical note on ecosystem services payments tax treatment
HMRC published guidance setting out how payments for ecosystem services—such as biodiversity net gain, nutrient credits, carbon credits from woodland and peatland—should be taxed. This covers income tax, corporation tax, capital gains tax, VAT, stamp duty land tax and inheritance tax. Key clarifications include when receipts are revenue versus capital, the treatment of expenses, and how stacking rules apply (for combining payments under different schemes like EWCO).
Editorial impact label: Medium
- Published
- Not recorded
- Policy event
- Not recorded
- Effective
- May 14, 2026
- Verification
- Not recorded
Open cited source
Scope: United Kingdom
Status requires verification
HMRC guidance on taxation of ecosystem services payments
Published on 14 May 2026, HMRC issued a technical note setting out how payments made by developers or others to landowners for ecosystem services—such as biodiversity net gain, nutrient credits, carbon credits—will be treated for income tax, corporation tax, capital gains tax, VAT, stamp duty land tax and inheritance tax. Key clarifications include whether payments are revenue or capital, how expenditure is deductible, and VAT treatment for statutory vs voluntary schemes.
Editorial impact label: Medium
- Published
- Not recorded
- Policy event
- Not recorded
- Effective
- May 14, 2026
- Verification
- Not recorded
Open cited source
Scope: United Kingdom
Status requires verification
Ecosystem services technical note: tax treatment of payments for biodiversity, nutrient and carbon services
Guidance published 14 May 2026 that clarifies how payments from developers or others to landowners for ecosystem services (biodiversity net gain, nutrient credits, carbon credits from woodland or peatland) are taxed across income tax, corporation tax, capital gains, VAT, stamp duty land tax, and inheritance tax. Provides certainty although not a policy change, helping affected taxpayers understand treatment.
Editorial impact label: Low
- Published
- Not recorded
- Policy event
- Not recorded
- Effective
- May 14, 2026
- Verification
- Not recorded
Open cited source
Scope: United Kingdom
Status requires verification
Technical note on ecosystem services
HMRC published guidance (14 May 2026) clarifying how various payments for ecosystem services — including biodiversity net gain, nutrient credits, carbon credits from woodland/peatland — are treated for Income Tax, Corporation Tax, Capital Gains Tax, VAT, Stamp Duty Land Tax, and Inheritance Tax. The note helps landowners and developers understand whether payments are income or capital, and how expenses are deductible or accounted for under UK tax law.
Editorial impact label: Medium
- Published
- Not recorded
- Policy event
- Not recorded
- Effective
- May 14, 2026
- Verification
- Not recorded
Open cited source
Scope: United Kingdom
Status requires verification
Ecosystem services — technical note
HMRC published guidance (14 May 2026) giving a detailed **technical note** on the tax treatment of payments made by developers and others to landowners for provision of ecosystem services (e.g. biodiversity net gain, nutrient credits, carbon sequestration via woodland and peatland). It covers implications for income tax, corporation tax, capital gains tax, VAT, stamp duty land tax, and inheritance tax. The note clarifies when receipts are revenue versus capital, what expenses are allowable, and how long commitments affect treatment.
Editorial impact label: Medium
- Published
- Not recorded
- Policy event
- Not recorded
- Effective
- May 14, 2026
- Verification
- Not recorded
Open cited source
Scope: Global
Status requires verification
IRS announces time-limited settlement opportunity for eligible taxpayers involved in conservation easement or historic preservation easement disputes
The IRS is offering eligible partnerships the chance to settle conservation easement or historic preservation easement disputes under more favorable terms: no charitable deduction but ‘other deductions’ for out-of-pocket costs; reduced penalties (10% in first 90 days, then 20%) instead of the usual 40%; no upfront payment required upon election. Covers both docketed and non-docketed cases. Effective for letters issued after May 13, 2026 under this initiative.
Editorial impact label: Medium
- Published
- Not recorded
- Policy event
- Not recorded
- Effective
- May 13, 2026
- Verification
- Not recorded
Open cited source
Scope: United States
Status requires verification
IRS Announces Terms of a Time-Limited Settlement Opportunity for Eligible Taxpayers Involved in Conservation Easement Disputes (IR-2026-65)
IRS is offering settlement terms for ~1,100 pending conservation easement or historic preservation easement disputes. Eligible partnerships may opt into favorable settlement periods (90 days initially, then 45 days) under reduced penalties and no requirement of upfront payment. Key implications include the loss of charitable contribution deductions but opportunity to deduct out-of-pocket costs, and significantly reduced valuation misstatement penalties compared to court outcomes. The policy encourages early settlement to limit litigation risk.
Editorial impact label: High
- Published
- Not recorded
- Policy event
- Not recorded
- Effective
- May 13, 2026
- Verification
- Not recorded
Open cited source
Scope: Global
Status requires verification
IRS announces terms of a time-limited settlement opportunity for eligible taxpayers involved in conservation easement disputes
New initiative under IR-2026-65 offering eligible partnerships in U.S. conservation easement or historic preservation easement cases gentler penalty terms, options to avoid upfront payments, and structured settlement windows (90-day, then 45-day), replacing harsher outcomes in litigation.
Editorial impact label: High
- Published
- Not recorded
- Policy event
- Not recorded
- Effective
- May 13, 2026
- Verification
- Not recorded
Open cited source
Scope: United States
Status requires verification
IRS releases new guidance through the Time-Limited Settlement Opportunity for Conservation Easement Disputes
IRS established a settlement initiative for eligible taxpayers in conservation or historic preservation easement disputes, offering more favorable terms (including reduced penalties, deductions based on out-of-pocket costs, and deferred liability) for those who accept during limited windows. Available for docketed and non-docketed partnership cases, previously rejected cases, and some cases with no prior settlement opportunity.
Editorial impact label: High
- Published
- Not recorded
- Policy event
- Not recorded
- Effective
- May 13, 2026
- Verification
- Not recorded
Open cited source