Comparison · Property Investment · 2026
Sole Name vs Joint Names Buy-to-Let 2026: Which Saves More Tax?
How you hold a rental property between spouses or partners can materially change the income tax and capital gains tax bill. Joint ownership can double the CGT annual exemption and shift income into a lower tax band, while sole ownership can be simpler and sometimes more tax-efficient if one partner is a much higher earner. Here is how the two structures compare for 2026/27.
TL;DR - 30-Second Summary
- - Sole name: simpler, but all income and gains taxed on one person's rate and one CGT exemption
- - Joint names: can split income to use both tax bands and both £3,000 CGT exemptions, but married couples default to 50/50 unless a Form 17 is filed
- - Biggest lever: shifting ownership toward the lower/non-taxpaying partner where the income gap is large
Side by Side: Sole Name vs Joint Names
| Feature | Sole Name | Joint Names |
|---|---|---|
| Income tax band used | One person's marginal rate only | Can spread across two bands |
| CGT annual exemption on sale | £3,000 (2026/27) | Up to £6,000 combined |
| Married couple default split | N/A | 50/50 unless Form 17 filed |
| Section 24 mortgage interest credit | 20% credit on one person's share | 20% credit split by ownership share |
| Admin complexity | Simple — one Self Assessment | More admin — two returns, possible Form 17/deed of trust |
| IHT planning flexibility | Whole value in one estate | Tenants in common can each will their share |
Worked Example: £15,000 Rental Profit
If one partner is an additional-rate taxpayer and the other has no other income, holding the property solely in the higher earner's name means £15,000 of rental profit is taxed at 45%, roughly £6,750. Splitting ownership 90/10 or 100/0 toward the non-earning partner (via Form 17 and a matching deed of trust) could see most of that profit taxed within the £12,570 personal allowance and 20% basic-rate band instead, potentially saving several thousand pounds a year.
Who Should Choose What?
Consider sole name if...
- - You are single, or your partner has an equally high income
- - You want the simplest possible tax admin
- - The property is a small side income unlikely to attract higher-rate tax
Consider joint names if...
- - There is a large income gap between partners
- - You want to use two CGT annual exemptions on sale
- - You are planning for inheritance tax using tenants in common
Frequently Asked Questions
Can I choose any income split between joint owners?
For married couples and civil partners, HMRC assumes a 50/50 split on jointly-held property by default, regardless of actual ownership share, unless you file a Form 17 declaration alongside evidence of the actual beneficial ownership split (e.g. 90/10 as tenants in common). Unmarried joint owners can split income according to their actual ownership share without needing Form 17.
What is the Section 24 mortgage interest restriction and does it apply per owner?
Section 24 replaced full mortgage interest deductibility with a 20% tax credit for individual landlords. It applies per individual owner based on their share of the rental income and their share of the mortgage interest, so a joint owner in the basic-rate band gets more relative benefit from the 20% credit than a higher-rate joint owner.
Why would a couple put a rental property in the lower earner's sole name?
If one partner is a non-taxpayer or basic-rate taxpayer and the other is a higher or additional-rate taxpayer, putting the property (or a larger ownership share) in the lower earner's name means rental profit is taxed at 20% instead of 40% or 45%, a significant ongoing saving.
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Does joint ownership double the CGT annual exemption on sale?
Yes. Each individual owner has their own £3,000 annual CGT exemption (2026/27) that can be set against their share of the gain, so joint ownership between two people can shelter up to £6,000 of gain from CGT compared to £3,000 for sole ownership.
Does transferring a property into joint names trigger stamp duty or CGT?
Transfers between spouses/civil partners living together are generally free of CGT (no gain, no loss basis) and are usually exempt from SDLT if no consideration (including mortgage debt taken on) changes hands, though SDLT can apply if the receiving spouse takes on a share of an existing mortgage above the SDLT threshold. Transfers to an unmarried partner can trigger both CGT and SDLT.
Is a joint mortgage required for joint beneficial ownership?
No, but most lenders require all legal owners on the title to also be on the mortgage. It is possible (though less common) to have unequal beneficial ownership recorded via a declaration of trust while the mortgage remains in joint names.
How does the additional-property stamp duty surcharge apply to joint buy-to-let purchases?
The higher rates for additional dwellings (currently a 5% surcharge in England) apply based on whether any of the joint buyers already own another property, not just the primary applicant — so a couple buying jointly where one already owns a home will trigger the surcharge on the whole purchase.
Can unmarried joint owners split rental income unevenly without a Form 17?
Yes. Unlike married couples, unmarried co-owners are taxed based on their actual beneficial ownership share as it stands (which should be reflected in a declaration of trust or the ownership deed), without needing the Form 17 process that only applies to spouses and civil partners.
Does sole-name ownership simplify inheritance planning?
Not necessarily. Joint ownership as tenants in common allows each owner to leave their share via a will, which can be useful for IHT planning (e.g. using both nil-rate bands), whereas sole ownership means the whole property passes through one person's estate.
What professional advice should I get before restructuring ownership?
Because Form 17 declarations, CGT no-gain-no-loss transfers, SDLT exemptions and mortgage lender consent all interact, it is worth getting advice from an accountant or tax adviser and, where a mortgage is involved, confirming with the lender before restructuring ownership of a buy-to-let property.
Calculators for this topic
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Disclaimer: Figures are based on 2026/27 tax rates including the £3,000 CGT annual exemption and Section 24 mortgage interest restriction. This is educational information, not tax or legal advice. Ownership restructuring can have CGT, SDLT and mortgage consent implications — seek advice from an accountant or solicitor before making changes, and see gov.uk on rental income tax.
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