Joint Ventures in Property: Legal and Tax Structure

Joint ventures are where you either leverage someone else's money and skills... or blow up a friendship and trigger HMRC's anti-avoidance radar. The structure matters more than the Instagram photo of you shaking hands.

1. Why JVs exist and the main structures

You use a JV when you cannot or do not want to do a deal alone:

You have cash, they have time and build contacts.

You have experience and lending capacity, they have capital.

A deal is simply too big for one balance sheet.

Under UK law you are usually in one of four buckets:

Simple contractual JV

You both stay as individuals or companies.

One owns the property, the other gets a contractual share of profits.

Still needs a written JV agreement, but there is no separate legal entity.

General partnership (Partnership Act 1890)

If you "carry on a business in common with a view of profit" and share profits/losses, the law can treat you as a partnership even without a written deed.

Governed by the Partnership Act 1890, which implies default terms if you do not agree your own.

Partners are jointly and severally liable: a creditor can chase the partner with the deepest pockets.

Limited Liability Partnership (LLP)

Created by the Limited Liability Partnerships Act 2000.

Separate legal person with limited liability for members.

For tax and CGT, normally treated as transparent, like a partnership: each member taxed on their share.

JV limited company

A bog-standard company (Companies Act 2006) with you both as shareholders and usually directors.

Company pays corporation tax on profits, you pay tax when profits are extracted (dividends etc).

Your PropertyKiln guide should make this point: if you "just do it together and split the profits" without writing anything down, you have probably created a Partnership Act 1890 partnership with full joint and several liability by accident.

2. Tax treatment: partnership vs LLP vs company

Very high level, because this is where people get sold schemes:

General partnership (including most bare "JVs")

Tax-transparent. HMRC and TCGA 1992 treat each partner as owning a fractional share of the assets and profits.

Each of you declares your share of rental profit and your share of gains on sale.

LLP

The LLP is a separate legal person (limited liability), but for income and CGT HMRC treats it like a partnership: transparent, taxed on the members.

TCGA 1992 s59A confirms that gains in an LLP are treated as gains of the members, not the LLP, with each owning a fractional share.

Recent HMRC Spotlight 63 kills the idea that moving BTLs into a hybrid LLP magically steps up your base cost or avoids Section 24: it does not.

Company JV

Company is taxed in its own right, usually at the corporation tax rates in force (per Finance Acts).

When the company sells property, TCGA 1992 and corporation tax rules apply to the company; you then get taxed again when you pull money out via salary/dividends or on a share sale.

So:

Partnership / LLP structures give look-through tax, simpler in some ways but they do not make property income "disappear" or magically become company income.

Companies give limited liability and control over timing of extraction, but you pay for that with extra admin and potential double taxation.

In 2026, HMRC is explicitly targeting "clever" hybrid LLP schemes. If a JV promoter is talking about uplifting base costs or section 24 fixes, that is a red flag, not a benefit.

3. The JV agreement: what you put in writing

Whatever structure you pick, you need a proper written agreement. It should cover:

Capital contributions

Who puts in what: cash, equity, personal guarantees, time.

Whether additional contributions are required if costs overrun.

Profit and loss sharing

Clear percentages for rent, profits on sale, and losses.

Do you repay capital first, then split profit, or split from pound one?

Roles and responsibilities

Who finds deals, who runs refurb, who manages tenants, who does bookkeeping.

Decision-making

What can each person decide alone?

What needs both to sign off (buy/sell decisions, new borrowing, big variations to refurb).

Exit provisions

How long the JV lasts.

What happens at the end: refinance, sale, right of first refusal.

Buy-out and default mechanisms

If one party stops performing or wants out early, how are they bought out and at what valuation.

Death / incapacity

What happens if one partner dies or loses capacity: do shares go to a spouse, can the survivor buy them out, how is that priced.

Dispute resolution

Escalation steps before lawyers: mediation, independent expert etc.

Forums massively underplay this. A two-page "heads of terms" plus WhatsApp messages is not a JV structure. It is a dispute waiting to happen.

4. Finance, mortgages and SDLT: the ugly practical bits

Mortgages and liability

On most standard BTL / commercial loans, all owners on the title and often all JV partners personally will need to be parties to the mortgage and give joint and several liability.

Even in a company or LLP, many lenders want personal guarantees from all members/directors.

If you are the one with assets and the other partner is skint, a partnership / LLP with joint and several liability means creditors will come for you first.

SDLT on joint deals

For a straight purchase in joint names, SDLT is calculated on the price of the property, not on each partner's share.

The 3% "additional property" surcharge will usually apply if any buyer already owns another dwelling.

In LLP / partnership structures, transfers and changes in profit shares can trigger SDLT under the "property investment partnership" rules; HMRC has explicitly warned that repeated profit reallocation can create multiple SDLT charges.

So if you and a mate both already own homes, forming a JV and buying a BTL together means all the usual SDLT surcharges apply, you do not dodge them by calling it a JV.

5. Family JVs and income splitting

Family joint ventures (spouse or parent/child) add another layer:

Spouse / civil partner

You can hold property jointly and split income.

HMRC rules on beneficial interest and Form 17 elections govern how rental income is taxed between spouses. You cannot just "decide" to give 99% of income to the lower-rate spouse unless the beneficial ownership matches.

Parent / child

Giving equity to children is a CGT and potentially IHT relevant transfer.

If you retain benefit (for example collecting rent yourself) while gifting interests, there are "gift with reservation" rules.

In both cases you avoid handshake assumptions and write down exactly who owns what, who is entitled to what, and who is on the hook to the lender and HMRC.

6. What forums get wrong about JVs

The myths you should kill in your PropertyKiln guide:

"We are just doing it together, so we don't need a JV agreement."

If you are both putting in money and sharing profit, the Partnership Act 1890 and common law will treat you as partners by default, with joint and several liability and default profit-sharing rules you probably never read.

"LLP = magic tax savings and protection."

The Limited Liability Partnerships Act 2000 gives you limited liability as a matter of company law, but HMRC treats most rental LLPs as transparent for tax.

Spotlight 63 has blown up the idea that hybrid LLPs "step up" base costs or dodge Section 24; TCGA 1992 still applies and the base cost does not magically uplift.

"The JV partner will be on the mortgage, so I'm safe."

Most lenders still take joint and several responsibility and personal guarantees. If your JV partner vanishes or goes bust, the lender can chase you for 100%.

"We can sort the paperwork later once we know it works."

Once money has gone in and a property is bought, you are in the worst position to negotiate terms.

Trying to retrofit agreements later is how people end up in long, expensive disputes about who owns what and who pays what.

"Family JVs don't need formality, we trust each other."

HMRC does not care about your family trust. It cares about beneficial ownership, the Partnership Act, TCGA 1992, and whether you are reallocating income in ways it has already targeted in Spotlight 63 and related guidance.

For your PropertyKiln piece, the honest line is:

A JV is not a way to do deals "with none of your own money". It is a way to share risk and return with another human being. If you would be embarrassed showing the structure to your accountant and a judge, you should not sign it.

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