How Much Does a Declaration of Trust Cost?

If you know you need a declaration of trust, you are probably looking at Form 17. Without it, HMRC will tax rental income from jointly owned property as 50/50 between spouses or civil partners who live together, no matter who actually paid for the property. A declaration of trust formalises your agreement about who owns what share of the property. Once Form 17 is submitted, HMRC can assess the rental income according to your actual beneficial shares rather than the default 50/50 split. 

For couples on different tax rates, getting the structure right can be much more important than the cost of drafting the document. If you genuinely hold unequal beneficial interests and can support this with a properly executed declaration of trust, Form 17 allows the tax treatment to reflect the real arrangement. This can significantly reduce the overall tax bill compared with simply leaving the income split at 50/50.

What a Declaration of Trust Actually Does & Why HMRC Cares 

A declaration of trust is a document that records who owns a property, known as the beneficial ownership, and in what shares. These shares can be different from the names and shares shown on the Land Registry title, which reflects the legal ownership. Beneficial ownership is what matters for the taxation of rental income and capital gains on a jointly owned property, because HMRC considers who is genuinely entitled to the income and proceeds, not just whose names are on the deeds. 

For married couples and civil partners who live together and jointly own a property that generates income, HMRC’s default rule is to tax the rental income equally, even if one partner contributed more money or is entitled to a larger share of the income. If the couple genuinely owns the property in unequal beneficial shares and wants the rental income to be taxed according to those shares, they must hold the property in unequal shares and jointly submit Form 17 to HMRC. 

This must be supported by evidence of the actual beneficial ownership, usually a properly executed declaration of trust, and submitted within the time limits set out in HMRC guidance. The Form 17 process is not available to unmarried co-owners, who are taxed by default according to their actual beneficial shares. 

What You Can Expect to Pay in 2026 

The cost of a declaration of trust depends on the firm you use, how complex the arrangement is, and how much advice you need: 

• Simple declarations:  Two co-owners with fixed shares (e.g., 70/30 split) £400–£720 including VAT 
• Standard documents:  Include provisions for sale, mortgages, or lender consent £600–£900 plus VAT (£720–£1,080 including VAT) 
• Complex arrangements:  Floating shares, tiered capital returns, or multiple properties £900–£1,500+ plus VAT (£1,080–£1,800+ including VAT) 

What the Fee Covers 

When comparing quotes from solicitors, it helps to know what you are paying for and what might appear as an extra charge.  

The main cost is the solicitor’s fee for the legal work. This  covers reviewing your situation, advising on how the ownership should be recorded, drafting the declaration of trust, making any agreed changes, and arranging for you to sign the document properly. Many fixed-fee quotes include at least one round of amendments, but you should always check in writing exactly what is included. 

VAT is currently charged at 20 per cent on most legal fees. For example, a quote of £500 plus VAT would come to £600 in total. Always confirm whether a quote is given before or after VAT so you can compare fairly. Solicitors also need to verify your identity to meet anti-money laundering rules. Sometimes this is included in the main fee, and sometimes it appears as a small extra charge per person. HM Land Registry charges a small fee for official copies of the register, which the solicitor will obtain to check how the property is currently held. 

Other costs may arise depending on your circumstances. If there is a mortgage, your lender may require you to notify them of the declaration of trust or even obtain their consent first. The solicitor usually handles this correspondence.  Lenders may charge fees ranging from £50 to £200 or more for providing consent or noting a declaration of trust on your mortgage account. The solicitor's costs will also increase if additional correspondence and negotiation with the lender is required. 

A Form A restriction on the title is not always required, but it can provide extra protection by preventing certain dealings with the property unless the beneficial owners are involved. HM Land Registry charges a fixed fee for registering a Form A restriction as a separate application. Your solicitor can advise whether this is appropriate for your situation. 

What drives the cost up 

The main factor that increases the fee is complexity. A simple fixed split, for example, 70 per cent to one owner and 30 per cent to the other, is usually quick to draft. More complicated arrangements, such as shares that change with additional contributions or where one person’s initial investment is returned first, take more time and cost more. 

The purpose of the declaration also matters. A document that simply records who paid what towards a deposit is straightforward. But if it is intended to support a Form 17 election, the wording must clearly reflect the beneficial shares of both the property and its income. HMRC requires evidence that the declared ownership is genuine, or the Form 17 may not achieve the intended tax outcome. If you jointly own several properties, mention this when requesting quotes. Some firms charge per property, while others offer a reduced rate for multiple declarations. Fees may also be higher if you need the work completed very quickly, such as within one or two working days, because your file must be prioritised. 

Stamp Duty, Form 17, and Key Considerations 

Changing beneficial ownership of a property can trigger Stamp Duty Land Tax (SDLT) if there is a mortgage. HMRC treats any mortgage debt taken on by the new owner as part of the chargeable consideration. From 1 April 2025, the main residential SDLT threshold is £125,000, and returns must usually be submitted if the consideration exceeds £40,000, even if no SDLT is due.  

 If a declaration of trust merely evidences beneficial interests that already existed at the time the property was acquired, and does not create or change those interests, SDLT does not apply.  

 To use Form 17 for tax purposes, the declaration must reflect genuine beneficial ownership of both the property and its income. A document that only allocates income without addressing ownership of the property itself will not support a valid Form 17 election.

Does it Pay Off? A Worked Example 

Sarah and James jointly own a rental property that earns £18,000 per year. Sarah pays a higher-rate tax (40%), and James pays a basic-rate tax (20%). 

Default 50:50 split (HMRC rule for married couples and civil partners): 

• Each is treated as receiving £9,000.  
• Sarah’s tax: 40% of £9,000 = £3,600  
• James’ tax: 20% of £9,000 = £1,800  
• Combined tax: £3,600 + £1,800 = £5,400  

Using a declaration of trust and Form 17 with unequal beneficial shares (James 90%, Sarah 10%): 

• James is treated as receiving 90% of the income: 90% of £18,000 = £16,200  
• Sarah is treated as receiving 10%: 10% of £18,000 = £1,800  
• James’ tax: 20% of £16,200 = £3,240  
• Sarah’s tax: 40% of £1,800 = £720  
• Combined tax: £3,240 + £720 = £3,960  

Annual tax saving: £5,400 – £3,960 = £1,440 

If the legal and advisory cost of setting up the declaration is £600 including VAT, the savings outweigh the cost in the first year and continue if the ownership shares and tax rates stay the same. 

Notes: 

• If both partners are in the same tax band, there is no income tax saving.  
• For unmarried couples, rental income is usually taxed according to actual beneficial shares, so Form 17 is not needed. A declaration of trust is still useful to clarify ownership and avoid disputes, which could be far more costly in court. 
• This example assumes Sarah's total income places her in the 40% tax band and James's total income (including his rental share) remains in the 20% band. Your actual tax position depends on your total income from all sources, seek personalized advice before proceeding. 

Checklist Before you Instruct a Solicitor 

Before contacting a solicitor, it helps to be clear on a few key points: 

Conclusion 

In 2026, there is no set fee for a declaration of trust. Simple declarations often cost a few hundred pounds, while more complex arrangements cost more. HMRC’s focus is on ensuring the document accurately records the true beneficial ownership to support Form 17. 

Stamp Duty Land Tax may apply if ownership changes and a mortgage is involved. For married couples or civil partners, Form 17 allows rental income to be taxed according to actual shares, which can reduce tax if one partner pays a higher rate. The form must be submitted within 60 days, and if unequal ownership is not clearly shown, income will continue to be taxed 50:50. 

Frequently Asked Questions