Selling Mortgaged property

When selling a mortgaged property, several tax considerations come into play. Here is a comprehensive guide on the key tax implications and steps to ensure compliance and optimization.


1. Capital Gains Tax (CGT)

If the property is not your main residence, you may be liable for Capital Gains Tax (CGT) on the profit made from the sale.

Calculating the Gain:

  • Gain = Sale Price - (Purchase Price + Allowable Costs)
  • Allowable Costs include purchase costs (e.g., legal fees, stamp duty) and improvement costs (not regular maintenance).

Principal Private Residence (PPR) Relief:

  • If the property was your main home for part of the ownership period, you might qualify for PPR relief for that period.
  • Calculation Example:
    • Ownership Period: 16 years (192 months)
    • Main Residence: 14 years (168 months) + Final 9 Months Relief = 177 months
    • Relief Proportion: 177 / 192 = 0.921875
    • Gain Covered by PPR Relief: £100,000 * 0.921875 = £92,187.50
    • Taxable Gain: £100,000 - £92,187.50 = £7,812.50

Letting Relief (if applicable):

  • Letting relief was available until April 2020. Now, it's only available if you share occupancy with the tenant.
  • Annual CGT Exemption: £12,300 (for the 2023/24 tax year). Any gain below this threshold is tax-free.

CGT Rates:

  • Basic Rate Taxpayer: 18%
  • Higher Rate Taxpayer: 28%
  • Example: For a higher rate taxpayer with a taxable gain of £7,812.50, the CGT would be £7,812.50 * 28% = £2,187.50.

2. Mortgage Considerations

  • Outstanding Mortgage: Ensure that the sale proceeds cover the outstanding mortgage. Any remaining mortgage debt needs to be cleared upon sale.
  • Early Repayment Charges: Some mortgages have early repayment penalties. Check your mortgage terms and account for any additional costs.

3. Stamp Duty Land Tax (SDLT) on Purchase of New Property

  • Additional Property Surcharge: When purchasing a new property, if you own more than one property at completion, a 3% SDLT surcharge applies on top of standard rates.
  • Replacement of Main Residence: If you are replacing your main residence, the surcharge might not apply, provided the old residence is sold within a certain timeframe.

4. Reporting and Payment

CGT Reporting:

  • CGT must be reported and paid within 60 days of the property sale (as of the 2020/21 tax year).
  • How to Report: Report the gain on your Self Assessment tax return or through the online real-time CGT service if you are not required to file a Self Assessment return.

Record Keeping:

  • Maintain detailed records of the purchase and sale, including purchase price, sale price, allowable costs, and any periods of residency or letting.

Example Calculation for a Mortgaged Property Sale


  • Purchase Price: £200,000
  • Sale Price: £300,000
  • Allowable Costs: £10,000 (legal fees, improvement costs)
  • Ownership Period: 10 years
  • Main Residence Period: 5 years
  • Final 9 Months Relief: 9 months
  • Letting Period: 4 years

Gain Calculation:

  • Total Gain: £300,000 - (£200,000 + £10,000) = £90,000
  • Main Residence + Final 9 Months: 5 years + 9 months = 69 months
  • Total Ownership: 10 years = 120 months
  • Relief Proportion: 69 / 120 = 0.575
  • PPR Relief: £90,000 * 0.575 = £51,750
  • Taxable Gain: £90,000 - £51,750 = £38,250
  • Annual Exemption: £12,300
  • Taxable Gain After Exemption: £38,250 - £12,300 = £25,950

CGT for Higher Rate Taxpayer:

  • CGT: £25,950 * 28% = £7,266


Selling a mortgaged property involves various tax considerations, including potential CGT liabilities. To optimize your tax position:

  • Utilize PPR relief if applicable.
  • Apply the annual CGT exemption.
  • Plan for early repayment charges on your mortgage.
  • Report the gain promptly to HMRC.
  • Keep detailed records to support your calculations.

For personalized advice, consult with Berkeley Accountants to ensure compliance with HMRC requirements and to explore any specific reliefs or exemptions you may qualify for.

Renting Mortgaged property by landlord

Renting out a mortgaged property in the UK involves several tax implications. Below is a comprehensive guide to help you understand these requirements and optimize your tax position.

Income Tax on Rental Income

  1. Rental Income:

    • All rental income must be declared to HMRC.
    • This includes not just rent received, but also any other payments from tenants, such as fees for services.
  2. Allowable Expenses:

    • You can deduct certain expenses from your rental income to calculate your taxable rental profit.
    • Mortgage Interest: As of the 2020/21 tax year, you can no longer deduct mortgage interest payments directly from your rental income. Instead, you receive a basic rate tax reduction (20%) on the interest payments.
    • Other Allowable Expenses:
      • Property repairs and maintenance (excluding improvements).
      • Property management fees.
      • Legal and professional fees (e.g., letting agent fees).
      • Utility bills, council tax, and insurance (if paid by you).
      • Ground rent and service charges.
      • Advertising costs to find tenants.
  3. Furnished vs. Unfurnished Property:

    • Wear and Tear Allowance: No longer available. Instead, you can claim the actual costs of replacing furniture and fittings.
    • Replacement of Domestic Items Relief: You can claim for the cost of replacing domestic items such as furniture, appliances, and kitchenware in a rental property.
  4. Record Keeping:

    • Maintain detailed records of all income and expenses related to the rental property.
    • Keep receipts, invoices, bank statements, and mortgage statements.
  5. Self-Assessment Tax Return:

    • You must report your rental income on your self-assessment tax return.
    • Ensure to file your tax return by the deadline (usually 31 January following the end of the tax year).

Capital Gains Tax (CGT)

  1. When You Sell the Property:

    • If you sell the property for a profit, you may be liable for CGT.
    • Calculation: CGT is charged on the profit (difference between the selling price and the purchase price, plus allowable costs).
    • Allowable Costs: Include purchase and sale expenses (e.g., legal fees, estate agent fees), and certain improvements (not repairs).
  2. Principal Private Residence Relief (PPR):

    • If the property was your main home before renting it out, you may be eligible for PPR for the period you lived in it.
    • Letting Relief: This was available until April 2020. Now, it's only available if you share occupancy with your tenant.
  3. Annual Exemption:

    • Each individual has an annual CGT allowance (£12,300 for the 2023/24 tax year). Gains up to this amount are tax-free.
  4. Rates:

    • CGT rates for residential property are 18% for basic rate taxpayers and 28% for higher and additional rate taxpayers.

Stamp Duty Land Tax (SDLT)

  1. Additional Property Surcharge:
    • When purchasing additional property, such as a buy-to-let or a second home, there is an extra 3% surcharge on top of the standard SDLT rates.

Other Considerations

  1. Mortgage Provider Notification:
    • Inform your mortgage lender if you intend to rent out your property. You may need to switch to a buy-to-let mortgage.
  2. Landlord Registration and Compliance:
    • Ensure you comply with local regulations, such as landlord registration, safety certificates (e.g., gas safety, electrical safety), and tenant deposit protection.

Practical Example


  • Rental Income: £15,000 per year.
  • Mortgage Interest: £4,000 per year.
  • Other Allowable Expenses: £3,000 per year (repairs, insurance, agent fees).


  1. Gross Rental Income:

    • £15,000
  2. Allowable Expenses:

    • Other Expenses: £3,000
  3. Taxable Rental Income:

    • £15,000 - £3,000 = £12,000
  4. Basic Rate Tax Reduction for Mortgage Interest:

    • 20% of £4,000 = £800
  5. Income Tax Calculation (Assuming 40% taxpayer):

    • Income Tax on £12,000 = £12,000 * 40% = £4,800
    • Less Mortgage Interest Relief = £4,800 - £800 = £4,000

Thus, the taxable rental income is £12,000, and the tax due after relief is £4,000.


Renting out a mortgaged property involves various tax implications, including Income Tax on rental income, potential CGT when selling the property, and SDLT on purchase. By understanding allowable expenses, reliefs, and proper record-keeping, you can ensure compliance with HMRC requirements and optimize your tax position. For personalized advice, consult with a tax professional experienced in property taxation.




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