Does SDLT arise if a parent gives a small share of rental properties to a child and later changes the profit split?

Introduction

People often ask whether Stamp Duty Land Tax (SDLT) is triggered when a family member is added to a buy-to-let property portfolio and the rental income is later divided in a different way. This usually comes up where a parent transfers a small ownership share to an adult child and wants to vary the income split for tax or family reasons.

The key point is that SDLT is charged on land transactions, not simply on changes to how profits are shared. Whether SDLT arises depends on whether there has been a chargeable land transaction and whether any chargeable consideration is given for it.

The Question

A landlord transferred a 1% interest in each buy-to-let property to an adult child so that they would both hold the properties together. The landlord then wanted to know whether SDLT would arise later if the parties changed only their income shares, so that the rental profits were divided differently from the legal ownership proportions.

Nick’s Explanation

Nick’s core answer was that SDLT is generally concerned with transfers of ownership interests in land. In anonymised form, his explanation was:

“No SDLT arises if the parties only change the profit-sharing arrangement and do not transfer any further ownership interest in the properties. SDLT is relevant where an interest in land is transferred, not where income is merely allocated differently.”

That broad point is right in principle, but the full SDLT position needs a little more care than a simple value threshold test. The real SDLT question is not just the market value of the share transferred. It is whether the transferee gives chargeable consideration, which can include taking on responsibility for mortgage debt.

The Law

SDLT is charged under the Finance Act 2003 on land transactions involving a chargeable interest in land.

The main provisions usually relevant in this kind of situation are:

• Finance Act 2003, section 42, which treats the acquisition of a chargeable interest as a land transaction.
• Finance Act 2003, section 43, which defines chargeable consideration.
• Finance Act 2003, Schedule 3, paragraph 1, which provides that SDLT is generally not charged on a gift where there is no chargeable consideration.
• Finance Act 2003, Schedule 4, paragraph 8, under which assumption of existing debt, including mortgage debt, can count as chargeable consideration.
• Finance Act 2003, Schedule 15, which contains special rules for partnerships.

If a person gives away a share in a property and the recipient gives nothing in return and does not assume any mortgage debt, that transfer may be outside SDLT because there is no chargeable consideration. But if the property is mortgaged and the recipient takes on part of the debt, SDLT can arise based on the proportion of debt assumed.

There is also an important distinction between:

• a simple co-ownership arrangement, where two people own property together; and
• a genuine property partnership for tax purposes, where Schedule 15 may need to be considered.

Not every family co-ownership arrangement is automatically a partnership for SDLT purposes.

Analysis

The issue can be broken down into two separate stages.

First, the original transfer of the 1% share.

If the parent transferred a 1% beneficial or legal interest in each property to the child, that was a land transaction. The next question is whether the child gave chargeable consideration for that acquisition.

• If there was no mortgage and no money paid, the transfer may have been a pure gift, in which case SDLT would usually not arise.
• If there was mortgage debt and the child effectively took on part of that debt, SDLT may have arisen on the amount of debt assumed.
• If money was paid for the share, SDLT may also have arisen depending on the amount of chargeable consideration and the rates in force at the time.

So it is not quite right to say that no SDLT is due simply because the value of the 1% share was below a particular figure. The more accurate test is whether there was chargeable consideration and, if so, how much.

Second, the later change in income shares.

If the parties later agree that rental profits will be split differently, but there is no further transfer of legal or beneficial ownership in the properties, that change does not normally amount to a chargeable land transaction for SDLT purposes.

In other words:

• changing who receives the income is not, by itself, the same as transferring more of the property;
• SDLT does not usually arise just because the profit-sharing ratio changes; and
• SDLT may arise only if the underlying ownership interests in the land are also altered, or if the arrangement falls within more complex partnership transfer rules.

If the arrangement is said to be a partnership, the analysis can become more technical. Schedule 15 to the Finance Act 2003 contains special SDLT rules for transfers involving partnerships, including transfers of land into or out of a partnership and changes in partnership interests. Whether those rules apply depends on the true legal and tax character of the arrangement, not just on calling it a partnership informally.

For many family property arrangements, the parties are simply co-owners and not carrying on a partnership in the SDLT sense. If that is the case, a later change in income entitlement alone would not usually trigger SDLT.

Outcome

A later change in rental profit shares does not normally trigger SDLT if there is no further transfer of ownership in the properties.

However, the original 1% transfer should not be assessed only by asking whether the share value was below a threshold. The correct SDLT question is whether the child gave chargeable consideration, especially by taking on part of any mortgage debt.

If ownership stays the same and only income allocation changes, SDLT is usually not the issue. But if beneficial ownership is also being changed, or if the arrangement is a genuine partnership within Schedule 15, the position needs closer review.

Practical Steps

• Check the transfer document for the original 1% transfer and confirm exactly what interest was transferred.
• Check whether any of the properties were subject to mortgages at the time of transfer.
• Work out whether the child assumed any part of the mortgage debt, directly or indirectly.
• Confirm whether the parties are merely co-owners or are genuinely carrying on a property partnership.
• Review any declaration of trust, partnership agreement, or income-sharing agreement to see whether it changes only income or also beneficial ownership.
• If the intention is to vary income only, ensure the documentation does not accidentally transfer a further interest in land.
• Take advice if there are multiple properties, mortgages, or any suggestion that Schedule 15 partnership rules may apply.

Conclusion

If a parent gives a child a small share in buy-to-let properties, SDLT on that original transfer depends on whether there was chargeable consideration, especially mortgage debt. After that, a later change to profit-sharing alone will not usually create a new SDLT charge unless there is also a transfer of ownership or the special partnership rules apply.

Legal References Used

• Finance Act 2003, section 42
• Finance Act 2003, section 43
• Finance Act 2003, Schedule 3, paragraph 1
• Finance Act 2003, Schedule 4, paragraph 8
• Finance Act 2003, Schedule 15

This page was last updated on 22 March 2026.

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