Property: A Declaration of Trust

With more couples investing in buy-to-let property, understanding how rental income is taxed has become increasingly important. In the UK, when a property is jointly owned, rental income is often split 50:50 between spouses or civil partners for tax purposes – regardless of who actually paid for the property or who receives the income.

This default position can lead to unnecessary tax if one partner pays a higher rate of income tax than the other. As rising rental income pushes more landlords into higher tax brackets, it has never been more important for couples to consider tax-efficient ownership strategies.

One of the most effective and straightforward tools available is a Declaration of Trust. This legal document allows partners to formally set out how ownership and rental income from a jointly owned property are divided – enabling them to allocate income in a way that maximises tax efficiency. When supported by the correct HMRC filings, this tool can turn ordinary property ownership into significant annual savings.

For many landlords, rental income provides a reliable source of cash flow – but it can also push them into higher tax brackets. If one partner pays higher rate tax at 40% or 45%, while the other is in a lower bracket (or has little to no income), transferring a greater share of the rental income to the lower-earning spouse can substantially reduce the couple’s overall tax liability.

HMRC fully recognises such arrangements when they are structured correctly. The crucial point is ensuring that any change in how income allocation is supported by the correct legal and tax documentation. A properly executed Declaration of Trust, combined with the Form 17 submission (where relevant), is central to making this planning both legitimate and defensible if HMRC ever reviews it. Without these, any informal ‘paper-only’ reallocations will not stand up to scrutiny.

Why couples consider transferring rental income

The UK tax system is progressive: the more you earn, the higher the rate of tax you pay. Here’s why many couples consider splitting income strategically.

• Reduce the overall household tax liability: If one spouse pays 40% tax and the other pays 20% (or none), reallocating rental income can cut the total tax bill significantly.
• Make use of personal allowances: Every individual has a £12,570 tax-free personal allowance (2024-25). If one spouse is not using theirs, why waste it?
• Optimise lower tax bands: Even if both spouses receive some income, diverting the appropriate sum of rental profits can keep the lower earner in the 20% band, and avoid tipping them into 40%.

An illustrative example

Consider a couple who jointly own a rental property generating £12,000 in annual rental profits. If the property is owned by the higher-earning spouse who pays tax at 40%, they would own £4,800 of income tax.

If the rental profits are legally transferred to the spouse – who has no income and an unused personal allowance – the same £12,000 could fall entirely within their tax-free allowance. In this case, the household’s tax bill would drop from £4,800 to £0, producing a significant saving without changing the overall family income.

The role of a Declaration of Trust

The cornerstone of this strategy is a Declaration of Trust (also known as a Deed of Trust). This is a formal legal document that confirms the beneficial ownership of a property – and thus who is entitled to the property’s income – regardless of whose name appears on the Land Registry title.

A Declaration of Trust enables beneficial ownership shares to differ from legal ownership, giving flexibility over how income and profits are divided. This allows couples to reflect their actual financial arrangements rather than relying on the default 50:50 split.

However, the Declaration of Trust must reflect the genuine economic reality of ownership and not just be used as a tax-saving device. It is normally drafted by a solicitor to ensure it is compliant.

Once the Declaration of Trust has been signed, couples who wish their rental income to be taxed in line with their new ownership proportions must submit HMRC Form 17 within 60 days. This ensures that rental profits are taxed according to the declared ownership shares.

HMRC’s view: substance over paperwork

HMRC takes a clear stance: tax treatment must follow genuine beneficial ownership, not informal arrangements. It is not enough for couples simply to agree between themselves to split rental income differently – there must be legal and documentary evidence to support the allocation.

• Jointly owned property: By default, rental income is taxed 50/50. If the beneficial ownership is different, only a valid Declaration of Trust and Form 17 can override this.
• Sole ownership: If only one spouse legally owns the property, all the rental income is taxed on them, unless a share is formally transferred through a Declaration of Trust. From then, both partners must declare their respective share on their own tax returns.

There are several ways for couples to restructure rental income ownership. The right method often depends on whether the property is jointly or solely owned, and whether there is an existing mortgage.

Transfers between spouses who are living together are free of capital gains tax – the receiving spouse simply inherits the original purchase cost for future capital gains tax purposes.

If there’s no mortgage, stamp duty land tax does not apply. However, if a mortgage is shared, HMRC treats the debt transferred as a ‘consideration’. Stamp duty land tax may therefore be payable if that amount exceeds £125,000.

The options for restructuring rental income include:

• Deed of assignment: transfers the right to receive income to a spouse (usually supported by Form 17);
• Severing joint tenancy: if the property is owned as joint tenants, this must first be converted to tenants in common before unequal ownership shares can be established;
• Transfer of equity: adds a spouse to the legal title. Lender approval is often needed, and stamp duty land tax may apply if a mortgage is involved; and
• Sale and purchase: one spouse sells the property to the other. Usually this is the most expensive route, as it may trigger capital gains tax, stamp duty land tax and legal fees, so is typically only used in broader estate planning.

Getting it right

Getting this right is crucial. While the rules are straightforward in theory, HMRC applies them strictly in practice. Couples must execute a Declaration of Trust before redistributing any income, submit Form 17 within 60 days of signing, ensure the ownership split reflects genuine beneficial ownership, and never attempt to backdate documents, as HMRC will disregard them.

When handled properly, transferring rental income between spouses through a Declaration of Trust is both legal and highly effective, unlocking significant tax savings. But if the paperwork or timing is wrong, couples risk HMRC challenge, unexpected tax liabilities and costly legal complications.

 

Author bio
Muhammad Bilal (MBA, MCMI)
Senior Consultant
M B Dean Accountants

"As rising rental income pushes more landlords into higher tax brackets, it has never been more important for couples to consider tax-efficient ownership strategies."

Muhammad Bilal, Senior Consultant, M B Dean Accountants