Removing Name from Mortgage: Buyout SDLT
How stamp duty is calculated when buying out a joint owner and taking sole ownership of a property.
Key Takeaways
- SDLT applies to the total consideration: cash paid to the departing owner plus their mortgage share you assume.
- For a £150k mortgage buyout of a 50% share with no cash premium, consideration is £75,000 - below the SDLT threshold.
- The 5% additional dwelling surcharge can apply if the remaining owner already owns another residential property.
- Remortgaging to fund the buyout does not change the SDLT calculation - only the consideration to the departing owner matters.
- Court-ordered divorce transfers are fully exempt from SDLT regardless of consideration involved.
- You must file an SDLT return within 14 days even when no tax is payable.
In this article
Removing a Name: The Process
When a joint owner is removed from a property - whether following a relationship breakdown, divorce, or simply a change in circumstances - one owner must buy out the other's share. This is a transfer of equity transaction where the remaining owner acquires the departing owner's share.
The buyout involves two things: paying the departing owner for their equity (the value of their share after deducting the mortgage), and taking on sole responsibility for the outstanding mortgage. Both elements can trigger SDLT, depending on the amounts involved and the relationship between the parties.
Use our stamp duty calculator to get an instant SDLT estimate for your specific buyout figures. This page explains the rules in detail with worked examples.
When SDLT Applies to Buyouts
SDLT applies to a buyout of a joint owner's share whenever there is chargeable consideration. Unlike a standard purchase where SDLT is always due (unless exempt), a buyout's SDLT position depends on what the departing owner receives:
| What the Departing Owner Receives | Chargeable? |
|---|---|
| Cash payment for their equity share | Yes - full amount |
| Their share of mortgage you assume | Yes - their % of balance |
| Nothing - pure release of interest | No |
| Transfer under divorce court order | Exempt |
In practice, most buyouts involve a mortgage, so the remaining owner almost always ends up with some chargeable consideration - even when the departing owner receives no cash.
Calculating Chargeable Consideration
The chargeable consideration for a buyout is the total economic value the remaining owner provides to acquire the departing owner's share:
Consideration Formula
Total Consideration = Cash paid to departing owner + (Departing owner's % × Outstanding mortgage)
Example: Buying out 50% share with £30,000 cash on a £150,000 mortgage:
Consideration = £30,000 + (50% × £150,000) = £30,000 + £75,000 = £105,000
Why Mortgage Assumption is Consideration
When the remaining owner takes over sole responsibility for the mortgage, they are relieving the departing owner of their mortgage liability. This relief has economic value - it is equivalent to paying the departing owner the amount of debt they are released from. HMRC therefore treats it as consideration under Finance Act 2003.
Worked Example: £300k Property, £150k Mortgage
This example covers a typical joint ownership buyout where neither party is married to the other.
Scenario Details
- Property value: £300,000
- Outstanding mortgage: £150,000
- Joint ownership: 50/50
- Remaining owner buys out departing owner's 50% share
- No cash payment - buyout funded solely by mortgage assumption
- Remaining owner does not own any other property
Step 1: Calculate Consideration
Remaining owner assumes the full £150,000 mortgage (was previously split).
Departing owner's share of mortgage: 50% × £150,000 = £75,000
Cash paid: £0
Total consideration: £75,000
Step 2: Apply SDLT Rates
£75,000 falls below the £125,000 threshold:
SDLT = £0
Variant: Departing owner wants £30,000 cash for their equity share
Total consideration = £75,000 (mortgage) + £30,000 (cash) = £105,000
Still below £125,000 threshold: SDLT = £0
Variant: Departing owner wants £80,000 cash for their equity share
| Band | Rate | Tax |
|---|---|---|
| £0 – £125,000 | 0% | £0 |
| £125,001 – £155,000 (total £155k) | 2% | £600 |
| Total SDLT | £600 |
Remortgaging to Fund the Buyout
Many people remortgage to raise the cash needed to buy out their joint owner's equity. This is a common and practical approach, but it is important to understand that the remortgage itself does not change the SDLT calculation.
SDLT is based on the consideration paid to the departing owner, not on the size of the new mortgage. Whether you fund the buyout from savings, a new mortgage, or equity release, the SDLT is identical.
Remortgage Timing
Most solicitors arrange the remortgage and the transfer of equity to complete simultaneously. The new mortgage funds the cash payment to the departing owner, and they are removed from both the title and the mortgage at the same time. This is the most efficient approach and avoids bridging finance.
Your lender will want to assess your sole affordability before agreeing to the remortgage. This may result in a lower loan amount than you had jointly, which could affect how much you can offer the departing owner.
Additional Dwelling Surcharge Considerations
The 5% additional dwelling surcharge applies to the buyout if the remaining owner owns another residential property at completion. This can arise in various scenarios:
- The remaining owner has a buy-to-let property or second home
- They have inherited a property they have not yet sold
- They have a beneficial interest in a property held through a trust
- They bought a new main residence before selling their old one
Surcharge on a £155,000 Consideration
If the 5% surcharge applies to the worked example above (£155,000 consideration), the total SDLT would be: £125,000 × 5% = £6,250 plus £30,000 × 7% = £2,100, totalling £8,350. This is a significant increase from the £600 without the surcharge.
If this will be the remaining owner's only property after the buyout, but they temporarily own another property (for example, they are in the process of selling), they may be able to reclaim the surcharge within 3 years if the second property is subsequently sold.
Lender Requirements
Removing someone from a joint mortgage requires lender consent. The lender needs to be satisfied that the remaining owner can afford the full mortgage on their sole income. Key requirements typically include:
- Affordability assessment: The lender will assess whether the sole applicant's income supports the full outstanding mortgage balance.
- Valuation: The lender may require a new property valuation to confirm adequate security.
- Consent to deeds change: The lender must formally consent to the removal from the mortgage and title deeds simultaneously.
- New mortgage deed: A new mortgage deed is typically signed by the sole remaining owner.
If the existing lender will not consent to a solo mortgage (perhaps because sole income is insufficient), you may need to remortgage to a different lender who will assess the application more favourably, or explore whether any other options exist such as a guarantor mortgage.
Divorce and Separation Scenarios
If you are removing your spouse from the mortgage as part of a divorce settlement, the SDLT position depends on whether there is a court order in place. Our dedicated divorce property transfer guide covers this in full, but the key points are:
With Court Order
- Fully exempt from SDLT
- Applies to transfers under Matrimonial Causes Act 1973
- Civil Partnership Act 2004 equally applies
- No consideration limit - entire transfer is exempt
Without Court Order
- Standard SDLT rules apply
- Mortgage assumption is chargeable consideration
- Cash payments are chargeable
- Separation agreements alone do not qualify
For unmarried couples separating, there is no divorce exemption. SDLT applies to the full chargeable consideration regardless of the nature of the relationship breakdown.
SDLT Rates Reference
| Consideration Band | Standard Rate | With 5% Surcharge |
|---|---|---|
| Up to £125,000 | 0% | 5% |
| £125,001 – £250,000 | 2% | 7% |
| £250,001 – £925,000 | 5% | 10% |
| £925,001 – £1,500,000 | 10% | 15% |
| Above £1,500,000 | 12% | 17% |
Practical Steps
- Agree the buyout price. Calculate the departing owner's equity share (property value × their % minus their mortgage share). Agree whether a premium is paid.
- Check sole mortgage affordability. Speak to your lender or a mortgage broker before proceeding to confirm you can service the full mortgage alone.
- Instruct a solicitor. A conveyancing solicitor will handle the transfer deed, SDLT, and Land Registry registration.
- Obtain lender consent. Your solicitor will apply for the lender's formal consent to the transfer and any new mortgage documentation.
- Exchange and complete. Both parties sign the TR1 transfer deed at completion.
- File SDLT return. Within 14 days of completion, file the SDLT1 return and pay any tax due.
- Register at Land Registry. The solicitor will update the title register to reflect sole ownership.
Total Costs to Expect
| Cost Item | Typical Range |
|---|---|
| Solicitor's fees (both parties) | £400 – £1,200 |
| Land Registry fee | £20 – £95 |
| Lender consent / admin fee | £0 – £300 |
| Remortgage arrangement fee (if applicable) | £0 – £2,000 |
| SDLT (on chargeable consideration) | £0 upwards |
Calculate Your Transfer of Equity
Use our calculator to work out the stamp duty on your transfer of equity.
Chargeable Consideration Breakdown
Note: SDLT is charged on the consideration (what is paid), not the property value
SDLT Calculation
| Band | Amount | Rate | Tax |
|---|---|---|---|
| ££0 - ££125,000 | £100,000 | 0% | £0 |
Total SDLT Payable
£0
Effective rate on property value
0.00%
Effective rate on consideration
0.00%
Disclaimer: This tool does not constitute financial advice. We do not recommend taking actions based solely on these results. The calculator makes assumptions and results may be inaccurate due to changes in government policy, interest rates, or personal circumstances. You use this information at your own risk. We can't guarantee to be perfect, so do note you use the information at your own risk and we can't accept liability if things go wrong. For official guidance, visit Gov UK.
Frequently Asked Questions
Can the departing owner refuse to be removed from the mortgage?
Yes. Both parties must agree to a transfer of equity - it cannot be forced. If the departing owner refuses, your options include negotiating a buyout price they will accept, seeking a court order (in divorce cases), or selling the property entirely. In practice most people agree to be removed once a fair buyout price is agreed.
What if the property is in negative equity?
Negative equity complicates buyouts significantly. If the property is worth less than the outstanding mortgage, the departing owner's "share" may be negative. In this case, no cash payment is made to the departing owner - instead, they may actually need to contribute to reduce the mortgage to a level the remaining owner can handle. SDLT would be nil as there is no consideration to tax.
How is the SDLT split between buyer and seller in a buyout?
In a transfer of equity, only the acquiring party pays SDLT - the remaining owner who is buying out the departing owner. The departing owner has no SDLT liability. However, both parties typically contribute to solicitor fees, which are separate from SDLT.
Is there capital gains tax on the departing owner's side?
Possibly, if the property is not or was not their main residence throughout their ownership. If the departing owner has used the property as their only or main home for the entire ownership period, principal private residence (PPR) relief fully exempts any capital gain. If the property was ever let out or used as a second home, a partial CGT liability may arise on the departing owner's gain.
Can I buy out my partner remotely without them being present?
Yes. Solicitors regularly handle transfers of equity where one or both parties are abroad or otherwise unavailable in person. Documents can be signed and witnessed remotely, and funds transferred electronically. Your solicitor will advise on the specific requirements for remote execution of the transfer deed.
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Emma Richardson, MRICS
Chartered Surveyor & Property Tax Specialist
Emma Richardson is a RICS-qualified Chartered Surveyor with over 12 years of experience in UK property taxation. She founded Stamp Duty Calculator to help buyers understand the complex world of property transaction taxes.