I'm considering a capital raise remortgage on a jointly owned BTL. What are the tax implications (CGT, income tax) if the funds are then used by only one owner for a separate property investment?
Quick Answer
Remortgaging a jointly-owned BTL for one owner's separate investment can complicate tax relief on mortgage interest. Section 24 disallows interest deductions if funds are not used for the joint BTL, affecting income tax. CGT is not incurred by the remortgage.
## Implications When Capital Raise Funds Diverge
When capital is raised from a jointly owned Buy-to-Let (BTL) remortgage and subsequently used by only one owner for a separate property investment, it creates specific tax considerations. The primary concern revolves around the deductibility of interest for income tax purposes, as Section 24 disallows mortgage interest deductions for individual landlords. However, for funds used for capital purposes within the BTL business, the interest effectively reduces profits, though not directly deductible. The key here is beneficial ownership and the 'wholly and exclusively' rule for allowable expenses.
### Income Tax and Mortgage Interest Relief
The most significant implication for individual landlords is the erosion of mortgage interest relief under Section 24. While the interest payments themselves cannot be directly deducted from rental income, a tax credit equivalent to 20% of the finance costs is applied. However, for a capital raise, the specific use of the funds dictates eligibility for this credit. If the funds are not used for the original BTL property, such as funding a new deposit for one owner's separate venture, the associated mortgage interest on the *diverted* portion of the capital raise will likely not qualify for the 20% tax credit against the jointly owned BTL's rental income. HMRC requires the loan to be for the purposes of the rental business from which you're claiming the relief. For example, if you jointly remortgage a BTL for £100,000 and £50,000 is used by one party for a separate property, the interest on that £50,000 parcel will not attract the 20% tax credit against the joint BTL's rental income. This can significantly increase the effective tax burden on the remaining rental profits for both owners, as the non-diverting owner effectively benefits less from the tax credit provision.
### Capital Gains Tax (CGT)
The act of remortgaging and raising capital itself does not trigger a Capital Gains Tax (CGT) event. CGT is only applied when a residential property is disposed of, meaning it is sold, gifted, or otherwise transferred. The tax rates for residential property CGT are 18% for basic rate taxpayers and 24% for higher/additional rate taxpayers. The annual exempt amount, as of December 2025, is £3,000. For example, if a jointly owned BTL is eventually sold for a £100,000 profit, and both owners are higher rate taxpayers, they would each pay 24% on (£50,000 - £3,000) = £47,000, amounting to £11,280 each. The capital raised from a remortgage may reduce the property's equity, but it does not crystallise a gain for CGT purposes at that point.
### Joint Ownership and Beneficial Interest
When property is jointly owned, the legal ownership (how it's registered at the Land Registry) and the beneficial ownership (who benefits from the property) can differ. If a capital raise from a jointly owned BTL is used solely by one owner, it could imply a shift in beneficial interest, or create an informal loan arrangement between the joint owners. This informal arrangement could have further tax implications if not properly documented. For instance, if one owner 'lends' their share of the raised capital to the other, the repayment of this 'loan' could be treated differently depending on the terms. Ensure clarity on whether the capital raise is distributed evenly, or if one party is genuinely borrowing from the other, potentially impacting their individual tax position regarding the joint BTL’s income.
## Potential Complications for Investors
### Increased Effective Tax Burden
Where the capital raised is not used for the jointly-owned BTL, the portion of mortgage interest relating to that diverted capital will not qualify for the 20% tax credit. This effectively increases the overall tax payable on the rental income from the jointly owned BTL for *both* owners, as the available tax credit pool is reduced, but the rental income is still divided.
### Beneficial Ownership Disputes
Diverting funds can lead to disputes over beneficial ownership, particularly if the arrangement is not formalised. If the shared BTL is eventually sold, and one partner has used a larger portion of the capital raise for personal investment, determining the distribution of sale proceeds and CGT liability could become complex. This is especially true if there's no pre-existing Declaration of Trust or clear loan agreement between the joint owners spelling out the terms of inter-partner borrowing or changes in equity. This lack of clarity could, for example, lead to challenges in calculating each owner's share of allowable acquisition costs for CGT. Investors must consider how this changes their relative contributions and potential return on investment.
### Council Tax Implications for New Property
The new property investment, if purchased by only one owner, could also fall under the new Council Tax premium rules from April 2025 if it's considered a second home or remains empty. For example, a second home paying £2,000 Council Tax annually could now face a £4,000 bill if a 100% premium is applied by the local council. While this doesn't directly affect the original BTL, it's a cost consideration for the new investment that affects the solo investor's overall portfolio health and ROI for their 'new' venture.
## Investor Rule of Thumb
If you're using capital from a jointly-owned property for a single owner's separate investment, ensure robust documentation of beneficial interest and loan arrangements to prevent future tax complications or disputes regarding allowable interest relief.
## What This Means For You
Most property investors don't lose money because they raise capital, they lose money because they raise capital without fully understanding the tax implications of diverting those funds. If you want to know how specific capital raise scenarios could impact your income tax and future CGT liabilities, this is exactly what we analyse inside Property Legacy Education. We help you understand the detailed tax implications of various financing decisions in your BTL portfolio.
Steven's Take
The issue of diverting capital raised from a jointly owned BTL is a situation many experienced investors have encountered. My advice is always to treat finances within jointly owned properties as if they were a separate business entity. If one partner uses funds specifically for their own investment, then a formal loan agreement, complete with repayment terms and potentially interest, needs to be established between the partners. This creates a clear paper trail for HMRC and defines beneficial ownership. Without it, you risk not only losing the tax credit on the mortgage interest from the joint BTL but also potential complexities if you ever seek to divide the assets, or if HMRC scrutinises your expenses. Clarity and documentation are your best defence here.
What You Can Do Next
Consult a property tax specialist: Obtain specific advice from a qualified property tax accountant (e.g., search ICAEW.com or STEP.org for specialists) to understand the precise implications for your individual circumstances and joint ownership structure. This is crucial for navigating Section 24 and beneficial ownership.
Review your BTL mortgage terms: Check the conditions of your existing or proposed capital raise mortgage for any restrictions on how the funds must be used or declarations required by your lender. Your mortgage broker can assist with this.
Formulate a formal loan agreement: If one owner is taking the funds for a separate investment, draft a legally binding loan agreement between the joint owners. This should detail the amount borrowed, interest rates (if any), and repayment schedule, ensuring transparency and reducing future disputes.
Update Declarations of Trust (if applicable): If you have a Declaration of Trust specifying beneficial ownership shares, review whether the capital raise and diversion of funds necessitate an amendment to reflect any changes in equity contribution or financial arrangement for the joint property.
Research Council Tax policies for new investments: If the capital is used for a new property, check the relevant local council's website for their current Council Tax premium policy on second homes and empty properties (e.g., gov.uk/council-tax-bills). This helps estimate the holding costs for the *new* separate investment.
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