Rentals & Sales
Letting Agent Today13 November 2025Medium risk

Stamp Duty Reform on the Horizon: What London Landlords Need to Know and Do Now

The UK government is reportedly considering replacing stamp duty with a new annual property tax on homes valued over £500,000, to be announced in the 26 November Budget. This potential shift could significantly alter tax liabilities, property transaction timing, and market dynamics for landlords. This article breaks down what these proposed reforms mean, practical steps to prepare, and how Rentals & Sales can support landlords through the transition.

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Understanding the Proposed Stamp Duty Reform

The rumoured reform, expected to be unveiled in the 26 November Budget, could see the traditional Stamp Duty Land Tax (SDLT) replaced by a national annual property tax on sellers of residential properties valued over £500,000. Currently, SDLT is a one-off tax paid at the point of purchase, with rates rising progressively above this threshold. Transitioning to an annual tax would be a fundamental shift in how property transactions are taxed and could have ripple effects across the private rental sector.

Why This Matters for Landlords

For landlords—especially those with higher-value properties—the implications are significant:

  • Tax Timing and Cash Flow: Instead of a one-time payment on purchase, an annual tax liability would affect ongoing cash flow. Landlords will need to budget for this recurring expense.

  • Portfolio Impact: Portfolio landlords with multiple properties over the £500,000 mark could face substantial cumulative annual tax bills, potentially altering investment returns and strategies.

  • Transaction Decisions: Sellers might delay or accelerate sales to manage tax exposure, potentially affecting market liquidity.

  • Valuation and Thresholds: With a £500,000 threshold, many London properties fall within scope, including single-family homes and HMOs, meaning a broad landlord demographic is impacted.

Practical Steps for Landlords and Agents

  1. Monitor Official Announcements: The government’s official Budget statement post-26 November will clarify details. Landlords should prioritise reviewing these to understand exact thresholds, rates, and exemptions.

  2. Engage in Industry Consultations: Rightmove is currently gathering letting agents’ feedback to influence government decisions. Agents and landlords should contribute their insights to shape fair policy outcomes.

  3. Review Financial Planning: Landlords should reassess cash flow forecasts and investment models to incorporate potential annual tax liabilities. This is crucial for portfolio landlords where cumulative impact is higher.

  4. Prepare Clients for Market Changes: Agents advising sellers or landlords should discuss how the reform might influence property pricing, transaction timing, and tenant relations.

  5. Update Compliance and Accounting Processes: Should the reform proceed, internal systems for tax payment tracking and reporting will need updates to handle an annual property tax rather than a one-off SDLT payment.

Considering Different Landlord Profiles

  • Single-Unit Landlords: May see a moderate increase in annual costs but can adjust rents or budgets accordingly.

  • HMO Landlords: As HMOs often have higher valuations, these landlords should prepare for a potentially larger tax impact and consider operational adjustments.

  • Portfolio Landlords: Will need detailed financial modelling to assess cumulative tax burden and may need to revisit portfolio strategies.

  • Accidental Landlords: Those less familiar with property tax complexities should seek professional advice to avoid unexpected liabilities.

What We Don’t Know Yet

Details such as the exact annual tax rate, exemptions, reliefs, or how transitional arrangements will work remain unclear. The government’s Budget statement and subsequent legislation will provide these specifics. Until then, benchmarking against existing local council tax and business rates may offer some context.

Next Steps: Workflow to Implement

  • Schedule a review meeting with your accountant or tax adviser after the Budget announcement.
  • Join industry webinars or forums discussing the reforms.
  • Engage your letting agent to update tenancy agreements or rent calculations if necessary.
  • Contact Rentals & Sales for a portfolio review and compliance audit to identify potential impacts and remedial actions.

How Rentals & Sales Can Help

We offer tailored portfolio reviews to assess financial impacts of tax changes and compliance audits to ensure your properties meet all evolving obligations. Our pricing strategy experts can advise on rent adjustments to manage new costs without compromising tenant retention. Reach out to us to schedule a consultation post-Budget.


Compliance Disclaimer: This article is for informational purposes only and does not constitute legal or financial advice. Landlords should consult qualified professionals regarding their individual circumstances.