The Impact of the 2025-26 Tax Year Changes on Mortgage Holders: What You Need to Know
1. Introduction – Navigating a New Tax Landscape
The 2025-26 tax year brings significant changes to the UK mortgage landscape that will affect millions of homeowners and investors. From revised stamp duty thresholds to updated capital gains tax allowances and new environmental levies, these changes create both opportunities and challenges for mortgage holders.
This guide explains:
Understanding these changes is crucial for making informed decisions about buying, selling, or refinancing property in the current fiscal environment.
---
2. Stamp Duty Land Tax (SDLT) Changes for 2025-26
2.1 Revised Thresholds and Rates
The government has introduced targeted relief for first-time buyers while increasing rates on additional properties:
| Property Type | SDLT Rate | Key Change |
|---|---|---|
| First-Time Buyer | 0% on first £425,000 | £25,000 increase from £400,000 threshold |
| Standard Purchase | 0% on first £250,000 | No change from previous threshold |
| Additional Property | 3% surcharge on entire purchase | No change to the surcharge rate |
Example: A first-time buyer purchasing a property at £450,000 in 2025-26 would save:
2.2 Multiple Dwellings Relief (MDR) Adjustments
The multiple dwellings relief threshold has been reduced from 5% to 3% for purchases of 4+ properties. This affects property developers and large-scale investors.
2.3 First-Time Buyer Definition Expansion
The definition of "first-time buyer" now includes:
---
3. Capital Gains Tax (CGT) Updates
3.1 Annual Exempt Amount (AEA)
The annual CGT exemption has been frozen at £12,300 for 2025-26, continuing the multi-year trend of reduced real value due to inflation.
3.2 Rates for Residential Property
| Taxpayer Type | CGT Rate | Key Change |
|---|---|---|
| Basic-rate taxpayers | 18% | No change |
| Higher-rate taxpayers | 28% | No change |
3.3 Private Residence Relief (PRR) Adjustments
The final period exemption has been extended from 9 to 12 months, providing additional flexibility for homeowners who move out before selling.
3.4 Let-Let Relief Modifications
The £40,000 Let-Let Relief cap has been indexed to inflation, increasing to £42,500 for gains arising in 2025-26.
---
4. Income Tax Changes Affecting Mortgage Holders
4.1 Basic and Higher Rate Thresholds
| Tax Band | Threshold Change | Impact |
|---|---|---|
| Basic rate | £37,700 to £39,000 | £1,300 extra taxed at 20% instead of 40% |
| Higher rate | £50,270 to £52,000 | £1,730 extra taxed at 40% instead of 45% |
Example: A homeowner with a mortgage and other income of £50,000 would benefit from the basic rate expansion, saving approximately £260 in income tax.
4.2 Dividend Tax Rates
For mortgage holders with investment properties or dividend income:
4.3 Pension Changes
The pension annual allowance has been increased to £60,000 for most taxpayers, providing flexibility for those using pension withdrawals to supplement mortgage payments.
---
5. Inheritance Tax (IHT) Implications
5.1 Residence Nil Rate Band (RNRB)
The RNRB remains at £175,000 but is now fixed (no further increases). This affects property inheritance planning.
5.2 Pre-Owned Asset Tax (POAT) Changes
The POAT threshold has been increased to £500,000, providing more flexibility for property owners transferring assets to family members.
5.3 Agricultural Property Relief (APR)
The APR for farming properties has been extended to include renewable energy installations, providing new opportunities for mortgage holders with agricultural land.
---
6. Environmental and Sustainability Taxes
6.1 Energy Performance Certificate (EPC) Requirements
6.2 Domestic Property Tax (DPT)
A new DPT of 1% on properties valued over £1 million has been introduced to fund local infrastructure.
6.3 Green Mortgage Incentives
Lenders now receive tax credits for offering below-market rates on mortgages for properties achieving EPC Band A or with renewable energy installations.
---
7. Mortgage-Specific Tax Changes
7.1 Mortgage Interest Relief Restriction
The restriction on mortgage interest relief for landlords continues, with only 20% of finance costs deductible against rental income. However, this is now capped at £25,000 per year for small landlords.
7.2 Stamp Duty on Remortgaging
The government has introduced a 0.5% stamp duty surcharge for remortgancing that releases equity from the property, effective from April 2025.
7.3 Mortgage Exit Fees
Lenders must now disclose mortgage exit fees in the Key Facts Document (KFD) and cannot exceed 0.5% of the outstanding balance.
---
8. Strategic Planning for Mortgage Holders
8.1 Timing Property Transactions
8.2 Remortgaging Considerations
8.3 Portfolio Management for Landlords
8.4 Inheritance Tax Planning
---
9. Case Studies: How Tax Changes Affect Different Scenarios
9.1 First-Time Buyer Scenario
9.2 Landlord Scenario
9.3 Property Investor Scenario
---
10. Checklist: Preparing for the 2025-26 Tax Year
| ✅ | Action |
|---|---|
| 1 | Review your property portfolio for EPC ratings and potential upgrades |
| 2 | Calculate your annual CGT exemption and plan property sales accordingly |
| 3 | Assess remortgaging needs before April 2025 to avoid equity release SDLT |
| 4 | Review mortgage interest relief entitlements under the new £25,000 cap |
| 5 | Check first-time buyer eligibility if you haven't owned property abroad |
| 6 | Plan property disposals to utilise the extended PRR 12-month period |
| 7 | Consider inheritance tax planning using the increased POAT threshold |
| 8 | Evaluate green mortgage options for potential tax incentives |
| 9 | Update letting agreements to reflect new tax treatment of mortgage interest |
| 10 | Consult a tax professional for personalised advice on your situation |
---
11. Long-Term Implications and Future Outlook
11.1 Evolving Tax Landscape
11.2 Mortgage Product Innovation
11.3 Regulatory Changes
---
12. Conclusion – Adapting to the New Tax Reality
The 2025-26 tax year brings both challenges and opportunities for mortgage holders. By understanding these changes and planning strategically, you can:
Remember that tax laws are complex and individual circumstances vary. Always consult with a qualified tax professional or financial adviser before making significant decisions based on these changes.
The key is to stay informed, plan ahead, and adapt your mortgage strategy to take advantage of new opportunities while mitigating risks in the evolving tax landscape.
---