You do not normally pay stamp duty on a remortgage when you are simply changing mortgage lender, switching products or borrowing more while the property’s legal ownership remains unchanged.
Stamp duty or another UK property transaction tax may become relevant when the remortgage is combined with a transfer of ownership. Common examples include adding a partner to the property title, removing a joint owner or buying out an ex-partner’s share.
The tax depends on where the property is located:
- England and Northern Ireland use Stamp Duty Land Tax, or SDLT.
- Scotland uses Land and Buildings Transaction Tax, or LBTT.
- Wales uses Land Transaction Tax, or LTT.
These taxes generally apply to the acquisition or transfer of an interest in property—not to the replacement of one mortgage loan with another.
Key Takeaways:
- A straightforward remortgage normally does not trigger stamp duty.
- Switching lender or taking a new deal with the same lender does not usually change legal ownership.
- Stamp duty on a remortgage can become an issue when someone acquires a share of the property.
- Cash paid for a property share may count towards the taxable amount.
- Taking responsibility for another owner’s mortgage debt can also count as chargeable consideration.
- Adding someone to the mortgage is not necessarily the same as adding them to the property title.
- Transfers arising from divorce, dissolution or formal legal separation may qualify for an exemption.
- SDLT, LBTT and LTT have different rates, filing rules and higher-rate regimes.
- A conveyancer should calculate the liability using the rules in force on the transaction’s effective date.
What Is Classed as a Remortgage?
A remortgage usually means replacing an existing mortgage with a new mortgage secured against the same property. The new loan may come from the existing lender or a different bank or building society.
The important question for property tax is not simply whether the mortgage changes. It is whether someone acquires a new or larger legal interest in the property.
Switching to a Different Lender
A homeowner might repay a mortgage with one lender and replace it with a mortgage from another lender offering a lower interest rate or more suitable terms.
Where the same person or people continue to own the property in the same proportions, switching mortgage lenders does not normally involve an acquisition of land. Stamp duty when changing mortgage lender is therefore not normally payable.
Taking a Product Transfer With the Same Lender
A product transfer involves moving to another mortgage rate or deal without changing lender.
Because ownership does not ordinarily change, a product transfer does not usually create an SDLT, LBTT or LTT liability. The lender may still charge a product or arrangement fee.
Borrowing More Against the Property
Increasing the mortgage to fund home improvements, consolidate borrowing or release cash does not, by itself, transfer ownership.
The tax position may change when the additional borrowing is used as part of an arrangement to acquire another person’s share. For example, one joint owner might remortgage to raise the money needed to buy out the other owner.
Remortgaging With a Transfer of Equity
A transfer of equity changes the legal ownership of a property without necessarily selling the whole property on the open market.
Examples include:
- Transferring a jointly owned home into one person’s sole name
- Adding a spouse or partner as an owner
- Removing an ex-partner from the title
- Changing the percentage shares held by existing owners
- Transferring a personally owned property to a company
It is the ownership transfer, not the remortgage itself, that can create a property transaction tax liability.
Is “Stamp Duty” the Same Across the UK?
“Stamp duty” is commonly used as a general term for property purchase tax, but the formal tax depends on the property’s location.
| Property location | Tax that may apply | Responsible authority |
| England | Stamp Duty Land Tax | HM Revenue and Customs |
| Northern Ireland | Stamp Duty Land Tax | HM Revenue and Customs |
| Scotland | Land and Buildings Transaction Tax | Revenue Scotland |
| Wales | Land Transaction Tax | Welsh Revenue Authority |
SDLT applies to relevant land transactions in England and Northern Ireland. Scotland replaced SDLT with LBTT in April 2015, while LTT replaced SDLT in Wales in April 2018.
Although the three systems share some broad principles, their thresholds, rates, exemptions, higher-rate rules and filing requirements are not identical. An online article discussing remortgage stamp duty UK rules should therefore avoid applying an English SDLT calculation automatically to a Scottish or Welsh property.
When Can Stamp Duty on a Remortgage Become Payable?
Stamp duty on remortgage arrangements may become payable when the transaction includes an acquisition of an ownership interest for chargeable consideration.
“Chargeable consideration” broadly means money or something else of monetary value given in exchange for the property interest.
When Does Legal Ownership Change?
Replacing a mortgage without changing the registered owners is normally only a financing transaction.
By contrast, adding or removing an owner changes who holds the legal interest in the property. That transfer must be examined separately from the mortgage application.
The mortgage lender will usually need to approve the change because the people responsible for the debt and the people named on the property title may be changing.
When Someone Is Added as an Owner?
Suppose one person owns a home and later transfers half of it to their partner.
The incoming partner may give chargeable consideration by:
- Paying cash for part of the equity
- Taking responsibility for part of the existing mortgage
- Providing another asset or something else of monetary value
HMRC confirms that a transfer to a spouse or partner can attract SDLT where the consideration for the transferred share exceeds the relevant threshold.
When One Owner Buys Out Another?
A transfer from joint ownership to sole ownership commonly occurs following separation or when one investor leaves a property arrangement.
The remaining owner may pay the departing owner for their equity and take over their share of the mortgage. Both elements can matter when calculating the taxable consideration.
When Cash Changes Hands?
Cash paid directly to the person transferring their share will normally form part of the consideration.
The amount taxed is not necessarily the entire market value of the house. It is generally the consideration given for the share being acquired, subject to special rules that may apply in more complex transactions.
When is Mortgage Responsibility Transferred?
Mortgage debt is one of the most frequently overlooked parts of a transfer-of-equity stamp duty calculation.
For SDLT, assuming responsibility for existing secured debt can count as chargeable consideration. Scotland’s LBTT guidance similarly treats the assumption, satisfaction or release of existing debt as consideration.
Welsh LTT guidance states that debt assumed or released can form part of the chargeable consideration and explains how the relevant proportion is established for joint owners.
This means a property described informally as a “gift” may still have a tax consequence when the recipient takes responsibility for an outstanding mortgage.
How Is Stamp Duty Calculated on a Transfer of Equity?
A useful starting formula is:
Cash or other value paid for the share + relevant existing mortgage debt assumed = potential chargeable consideration
The applicable tax rates are then applied to that consideration, taking account of the property’s location, the buyer’s circumstances, available exemptions and any higher-rate rules.
Worked Transfer-of-Equity Example
Assume two unmarried people own a house equally in England:
- Current property value: £550,000
- Outstanding mortgage: £200,000
- Total equity: £350,000
- Each owner’s half of the equity: £175,000
- Each owner’s assumed share of the mortgage: £100,000
One owner buys out the other and becomes the sole owner.
The remaining owner:
- Pays £175,000 for the departing owner’s equity
- Takes responsibility for the departing owner’s £100,000 share of the mortgage
The total chargeable consideration would therefore be:
£175,000 + £100,000 = £275,000
Using the standard residential SDLT bands in force on 17 July 2026, and assuming the higher rates do not apply, the calculation would be:
- 0% on the first £125,000: £0
- 2% on the next £125,000: £2,500
- 5% on the remaining £25,000: £1,250
Illustrative SDLT liability: £3,750
The current standard SDLT threshold for a residential transaction is £125,000. Different calculations may apply where the buyer owns another property, is a non-UK resident, qualifies for an exemption or is involved in a limited company or partnership transaction.
A Freshness Warning About HMRC’s Worked Example
HMRC’s transfer-of-ownership guidance contains a similar £275,000 example but dates the transaction to October 2022. It shows tax of £1,250 because the temporary SDLT bands applying at that time included a £250,000 nil-rate threshold.
That historical figure should not be treated as the current tax calculation. The standard residential threshold returned to £125,000 on 1 April 2025. Readers should use the current rates applicable on the effective date of their transaction.
This difference is an important reason not to copy a tax figure from an older transfer-of-equity article without checking its dates.
Common Remortgage Scenarios and Whether Tax Is Usually Due
| Scenario | Does ownership change? | Property transaction tax normally due? |
| Switching to another mortgage lender | No | Normally no |
| Taking a product transfer | No | Normally no |
| Increasing borrowing for home improvements | No | Normally no |
| Releasing cash while retaining the same owners | No | Normally no |
| Adding a partner to the mortgage only | No property transfer by itself | Normally no |
| Adding a partner to the property title | Yes | Possibly |
| Removing a joint owner from the title | Yes | Possibly |
| Buying out an unmarried co-owner | Yes | Possibly |
| Remortgaging a buy-to-let with unchanged ownership | No | Normally no |
| Transferring a property to a limited company | Yes | Specialist rules may apply |
| Porting a mortgage to a newly purchased property | A new property is acquired | Tax may apply to the purchase |
These are general indicators rather than definitive tax decisions. The amount of consideration, the property location, the buyer’s other property interests and any reliefs must also be considered.
Do You Pay Stamp Duty When Adding a Partner?
Adding a partner to a mortgage and adding a partner to the legal title are different actions.
Someone can, in certain lending arrangements, become responsible for mortgage payments without acquiring ownership. Because they have not acquired an interest in the land, that lending change alone would not ordinarily create a property transaction tax charge.
Where the partner is also added to the title, the transfer must be examined for consideration.
For example, a homeowner might transfer half of a property to their partner without receiving cash. If the property has no mortgage and nothing else of value is given, the transfer may be a genuine gift with no chargeable consideration.
However, where the incoming partner takes responsibility for half of an outstanding mortgage, that portion of the debt may count as consideration. HMRC provides an example in which cash paid for equity and an assumed share of mortgage debt are combined when establishing the SDLT position.
Revenue Scotland also explains that where a person acquires a half share and assumes part of an existing secured debt, the relevant proportion of that debt can be chargeable consideration for LBTT. Welsh guidance applies a comparable debt-assumption principle for LTT.
The transaction may therefore be taxable even when the couple describe the ownership share as a gift.
What Happens After Divorce or Separation?
The rules following divorce or separation depend on the couple’s legal status and how the property transfer is documented.
In England and Northern Ireland, SDLT is not payable where an interest in land or property is transferred between spouses or civil partners under an agreement or court order connected with divorce, dissolution, annulment or legal separation. HMRC also states that there is no need to notify it of an exempt transfer meeting those conditions.
Revenue Scotland provides an LBTT exemption for qualifying property transactions resulting from a court order or agreement connected with divorce, nullity or legal or official separation.
In Wales, the Welsh Revenue Authority lists property transfers resulting from divorce or dissolution of a civil partnership among transactions that do not require an LTT return or payment.
Unmarried couples should not assume the same exemption applies. Where one unmarried owner buys the other’s share, cash and assumed mortgage debt may create chargeable consideration.
A transfer should be reviewed before completion because an informal private arrangement may not receive the same treatment as a qualifying court order or legally recognised agreement.
Does Releasing Equity Trigger Stamp Duty?
Releasing equity through a larger mortgage does not normally trigger stamp duty when the same owners retain the same property interests.
For example, a sole homeowner might replace a £150,000 mortgage with a £200,000 mortgage and use the additional funds for renovations. The larger loan changes the financing but does not give another person an ownership share.
The answer can change when the equity release forms part of a wider property transfer.
Additional borrowing might be used to:
- Buy out a co-owner
- Add a partner to the title
- Transfer the property to a company
- Rearrange ownership among family members
In those situations, the conveyancer must separate the mortgage refinancing from the acquisition of the property interest.
Equity release products such as lifetime mortgages are also distinct from an ordinary capital-raising remortgage. Product suitability and long-term borrowing costs should be considered separately from property transaction tax.
Do Landlords Pay Stamp Duty When Remortgaging?
A landlord does not normally pay stamp duty merely for replacing a buy-to-let mortgage where the property remains in the same ownership.
Tax can arise where the arrangement also transfers the property or a share of it.
Examples include:
- Adding a spouse or business partner as an owner
- Removing an investor from a jointly owned property
- Transferring a personally owned rental property into a limited company
- Acquiring a larger share of a jointly owned portfolio property
Higher-rate rules may also need to be considered when the person acquiring the share owns another dwelling. England and Northern Ireland apply higher SDLT rates to qualifying acquisitions of additional residential property. Scotland has the Additional Dwelling Supplement, while Wales applies higher residential LTT rates in qualifying cases.
Company, partnership and connected-person transfers can involve special market-value or relief provisions. A landlord considering such a transfer should obtain property-tax and capital-gains-tax advice rather than treating the transaction as a routine remortgage.
Other Costs You May Pay When Remortgaging
No stamp duty does not mean that remortgaging is free.
Depending on the lender, mortgage product and legal work required, the costs may include:
- Mortgage arrangement or product fees
- Property valuation fees
- Conveyancing or legal fees
- Early repayment charges on the existing mortgage
- Mortgage exit or discharge fees
- Broker or mortgage adviser fees
- Electronic transfer charges
- Land registration costs where the title is changed
- Additional legal fees for a transfer of equity
Some mortgage products include free legal work or a free standard valuation, but those incentives may not cover complex ownership changes. MoneyHelper recommends comparing the overall cost of mortgage deals, including product fees, rather than considering the headline interest rate alone.
Where an early repayment charge applies, completing a remortgage before the existing deal ends may significantly affect whether switching is worthwhile.
How to Check Whether Your Remortgage Could Be Taxable?
Use the following steps before completing the transaction.
- Check the registered ownership. Confirm whether the names or ownership shares on the property title will change.
- Separate the mortgage from the property transfer. A new mortgage and a transfer of equity may complete together, but they have different legal and tax consequences.
- Identify all cash payments. Record any amount paid to an owner who is transferring their share.
- Check the outstanding mortgage. Establish how much secured debt exists immediately before the transfer.
- Calculate the debt being assumed. Determine whether the incoming or remaining owner will become responsible for another person’s share.
- Confirm the jurisdiction. Use SDLT rules for England and Northern Ireland, LBTT rules for Scotland and LTT rules for Wales.
- Consider higher-rate rules. Tell the conveyancer about any other residential properties owned in the UK or overseas.
- Check for an exemption or relief. Divorce, civil-partnership dissolution and other circumstances may receive special treatment.
- Use current rates. Tax thresholds can change, and older worked examples may no longer produce the correct result.
- Confirm the filing requirement. A return may sometimes be required even when the calculation produces no tax.
Common Misunderstandings About Remortgage Stamp Duty
“A Bigger Mortgage Automatically Means More Stamp Duty”
- Not necessarily. Increasing the loan without changing ownership does not ordinarily create a land acquisition.
- Mortgage debt becomes relevant when responsibility for that debt is assumed, released or rearranged as part of an ownership transfer.
“Adding Someone to the Mortgage Makes Them an Owner”
- A mortgage records obligations to the lender. The property title records legal ownership.
- Although lenders often require borrowers and owners to align, the two concepts should not be treated as interchangeable when assessing stamp duty on transfer of equity arrangements.
“No Cash Means No Tax”
- This is not always correct.
- Assumed mortgage debt may count as chargeable consideration even when no cash is paid to the person transferring the property share.
“The Property’s Full Value Is Always Taxed”
- The calculation is generally based on the consideration given for the interest acquired, not automatically the market value of the entire property.
- Special market-value rules can apply in particular company, partnership or connected-party transactions, so professional advice may be necessary.
“UK Stamp Duty Rules Are Identical Everywhere”
- They are not.
- England and Northern Ireland use SDLT, Scotland uses LBTT and Wales uses LTT.
- Rates, supplements, exemptions and filing rules must be checked separately.
Conclusion: Is Stamp Duty Payable When Remortgaging?
For most homeowners, the answer to “do you pay stamp duty on a remortgage?” is no.
A normal lender switch, product transfer or increase in borrowing does not usually trigger property transaction tax when legal ownership remains unchanged.
The position becomes more complicated when a remortgage is combined with a transfer of equity. Stamp duty on remortgage arrangements may then be payable because someone is acquiring a property share in exchange for cash, mortgage debt or another form of chargeable consideration.
Before adding or removing an owner, buying out a partner or transferring a rental property, ask the conveyancer to calculate the liability under the current SDLT, LBTT or LTT rules. This is particularly important because tax rates change and official examples may show historical calculations.
Frequently Asked Questions
Do I pay stamp duty when switching mortgage lenders?
Normally, no. Switching from one mortgage lender to another does not generally create a property transaction tax liability where the registered owners and their ownership shares remain unchanged.
Does a product transfer trigger stamp duty?
A product transfer with the same lender does not normally trigger stamp duty because it changes the mortgage deal rather than the legal ownership of the property.
Is stamp duty payable when releasing equity?
Not usually, provided the same people continue to own the property in the same proportions. Tax may become relevant if the money is used as part of a transfer of ownership, such as buying out a joint owner.
Do I pay stamp duty when adding my partner to the property?
Possibly. If your partner acquires a share and pays cash or assumes responsibility for part of an existing mortgage, that value may be chargeable consideration. The applicable threshold and rates depend on the property’s location and the buyer’s circumstances.
Is stamp duty due when buying out an ex-partner?
It can be. Cash paid for the ex-partner’s equity and mortgage debt assumed may both count. Qualifying transfers arising from divorce, dissolution or formal legal separation may be exempt, but unmarried couples do not automatically receive the same treatment.
Do landlords pay stamp duty when remortgaging a buy-to-let?
An ordinary buy-to-let remortgage with unchanged ownership does not normally trigger property transaction tax. A transfer to another person, partner or company may create a liability and could engage higher-rate rules.
Are remortgage tax rules different in Scotland and Wales?
Yes. Scotland uses LBTT and Wales uses LTT. Both differ from the SDLT system used in England and Northern Ireland, although all three systems may treat assumed mortgage debt as consideration in an ownership transfer.
Important: This article provides general information, not personalised tax, legal or mortgage advice. Property-tax treatment depends on the transaction documents and the rules in force on the effective date.
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