The choice between joint tenancy and tenants in common is the first decision a couple makes when they buy property together. Most do not realise they are making it; the conveyancing pack arrives with joint tenancy ticked as the default, and that is how the title is registered. The choice is reversible (joint tenancy can be severed to tenants in common at any time, by either co-owner alone, without the other's consent) but the routine default rarely matches what a buy-to-let couple actually wants. This page works through the structural difference between the two, the tax consequences that flow from each, the severance route, and the decision framework that drives most landlord couples away from the default.
The legal distinction in one paragraph
Joint tenancy is undivided ownership. Each joint tenant owns the whole property together with the other, with no separable share. The four "unities" (possession, interest, title, time) apply: every joint tenant has the same right of possession over the whole, an equal interest, derived from the same conveyance, taking effect at the same time. Tenants in common need only the unity of possession; each tenant in common holds a distinct share (the share can be equal or unequal) and the shares need not derive from the same instrument or take effect at the same time. The structural shorthand is that joint tenants own the whole as one, while tenants in common own discrete percentages of the same thing.
On the Land Registry title the visible marker of tenants-in-common holding is the Form A restriction: "No disposition by a sole proprietor of the registered estate (except a trust corporation) under which capital money arises is to be registered unless authorised by an order of the court." Tenants in common have a Form A; joint tenants do not. The restriction warns third parties that a sole survivor cannot give a clean receipt for sale proceeds, which is the practical signal that the property is not held under survivorship.
Survivorship: the largest single difference
On the death of a joint tenant, their interest passes automatically to the surviving joint tenant(s) by operation of law (the right of survivorship, jus accrescendi). It does not pass under the deceased's will; the will cannot dispose of an interest the deceased no longer holds at the moment of death. The interest is also outside the probate estate for administration purposes (no grant of probate is needed to deal with the deceased's interest in the property; the surviving joint tenant is simply registered as sole proprietor on production of the death certificate).
On the death of a tenant in common, the deceased's share is part of the probate estate and passes under the will (or by intestacy, where there is no valid will). The share is a distinct asset that can be left to the surviving co-owner, to children, to a discretionary trust, or to anyone the deceased chose. The surviving co-owner does not automatically take the deceased's share; they take what the will gives them.
For IHT, the joint-tenancy survivorship rule does not avoid inclusion of the interest in the deceased's estate. IHTM15040 treats the deceased as having been beneficially entitled to a share in the joint property for IHT valuation purposes; that share is in the death estate at market value, with the standard discount adjustments (typically 10% to 15% for jointly held residential property, reflecting the difficulty of selling a part-share). The IHT bill arises in the same way as for a tenant-in-common share. What survivorship removes is the planning flexibility: the share goes to the survivor whether or not that is the IHT-efficient route.
Shares: equal vs unequal
Joint tenancy requires the unity of interest, so the joint tenants' shares are equal as a matter of property law. Two joint tenants hold 50/50; three joint tenants hold one-third each; and so on. A purported declaration of unequal shares between joint tenants (for example, by deed of trust) does not change the legal title; it either severs the joint tenancy (because the unity of interest is broken) or fails as a matter of property law.
Tenants in common can hold in any ratio: 50/50, 70/30, 99/1, or any combination of more than two parties in any split. The shares are normally established at acquisition (the conveyance specifies the shares) and recorded in a separate written declaration of trust between the parties. The shares can be varied over time by fresh declarations of trust. The structural flexibility is the reason TIC is the only ownership form that supports Form 17 income shifting (see the canonical Form 17 mechanic page): s.837 requires the declared income split to match the actual beneficial share, and only TIC can record an unequal share.
A like-for-like comparison
The table below compares the two structures across the dimensions that matter to a landlord couple. The figures are illustrative; the actual position depends on the specific property, the couple's other assets, and the relevant tax year.
| Dimension | Joint tenancy | Tenants in common |
|---|---|---|
| Share structure | Equal only (50/50 for two) | Any ratio (50/50, 70/30, 99/1) |
| What passes on death | Whole interest by survivorship | Share by will or intestacy |
| Form 17 income split available? | No (no unequal share to declare) | Yes (if shares are unequal) |
| IHT on first death (spouses) | Spouse exemption applies; share to survivor; no nil-rate-band planning route | Spouse exemption applies; share goes per will; nil-rate-band trust route open |
| IHT on first death (non-spouses) | Share in estate at MV; passes to survivor without will control | Share in estate at MV; passes per will (or intestacy) |
| CGT base-cost uplift on death | Yes, in survivor's hands | Yes, in beneficiary's hands |
| SDLT on purchase | Same (no structural advantage) | Same |
| SDLT higher-rate joint-buyer trigger | Triggered by any joint buyer's existing property | Triggered by any joint buyer's existing property |
| Severance from this structure | To TIC by s.36(2) notice (unilateral) | Back to JT by mutual deed (rare) |
| Land Registry restriction | None | Form A restriction |
| Mortgage flexibility | Whole property jointly mortgaged | Whole property jointly mortgaged (TIC shares are not separately mortgageable) |
Two columns are equal at every line: SDLT on purchase, and the SDLT joint-buyer trigger. SDLT does not care about the JT vs TIC choice (it cares about the consideration and the joint-buyer test under FA 2003 Sch 4ZA). The structural choice cannot be used to avoid the joint-buyer surcharge.
Severance: the route from JT to TIC
Joint tenancy is severable; tenants in common is not (because there is nothing to sever, the shares are already separable). The standard severance route in England and Wales is a written notice under Law of Property Act 1925 s.36(2). The mechanics:
- One joint tenant prepares a written notice stating that the joint tenancy is severed. The notice need not give reasons.
- The notice is served on the other joint tenant. Personal service is the safest route; postal service to the other tenant's last known address is acceptable under s.196 LPA 1925.
- The serving tenant lodges Form RX1 with the Land Registry to apply for the Form A restriction.
- The Land Registry enters the restriction and the title is now held as tenants in common.
The other tenant's consent is not required. The notice is effective on service, not on Land Registry registration; the restriction follows administratively. The effect is that the parties hold as tenants in common in equal shares (50/50 for two co-owners) from the date of service. If the parties want to hold in any ratio other than 50/50, the next step is to execute a written declaration of trust setting out the new shares.
Two warnings sit alongside the mechanic. First, severance is one-way in practical terms: re-creating a joint tenancy from tenants in common requires a fresh conveyance with the unity of interest restored, which most couples do not bother with. Second, the severance itself produces no tax consequence (no SDLT, no CGT, no income tax) but a subsequent unequal-share declaration of trust can trigger SDLT if the receiving party takes on a share of mortgage debt (the assumed-debt rule in FA 2003 Sch 4 para 8). The order of operations matters and the trap is worth advice.
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Where the structural choice flows into tax
The JT vs TIC decision shapes (or is shaped by) several distinct parts of the tax code. Each is worth understanding in its own right; the structural decision sits upstream of all of them.
Income tax and Form 17
For spouses and civil partners, ITA 2007 s.836 applies a deemed 50/50 split to jointly held property income. The default applies equally to JT and TIC holdings. The lever to escape the default (Form 17, under s.837) is only available where the actual beneficial shares are unequal, which only TIC can support. JT couples who want unequal income shares for tax planning have one route: sever to TIC, execute a deed of trust establishing the new shares, file Form 17 within 60 days. Our Form 17 mechanic page walks the election in full.
For unmarried co-owners, income follows actual beneficial ownership. JT presumes equal shares, so 50/50; TIC reports per the declared shares.
IHT on first death
The IHT treatment of the death share is the same in both structures: it is in the estate at market value. What differs is what the share can do next. A JT share goes to the surviving co-owner automatically; the surviving spouse takes it free of IHT under the spouse exemption (IHTA 1984 s.18) but the deceased's nil-rate band is not consumed by the property. The second-death position is that the property is in the survivor's estate at the survivor's death value, and the spouse-exemption-protected first death has produced no IHT-side benefit on the property itself.
A TIC share, by contrast, can be left under the will to a nil-rate-band discretionary trust, or directly to the children, or to the survivor, as the IHT-planning analysis dictates. For couples with a property worth materially more than the available nil-rate bands, TIC plus a will trust is normally the right combination. The IHT depth analysis for the structural choice sits in our IHT joint-ownership page.
CGT base cost on death
The death uplift applies in both structures: the share passing on death takes a market-value base cost in the recipient's hands. The structural difference is who the recipient is. JT delivers the uplift to the survivor only; TIC delivers it to whoever the will appoints. For appreciated investment property where the next disposal is years away, the choice of recipient matters: a survivor planning a sale soon takes the uplift to the right person; a trust or child beneficiary takes the uplift earlier in the chain, opening planning options.
SDLT joint-buyer trigger
Sch 4ZA para 2(3) FA 2003 (the joint-buyer rule) applies the higher-rate surcharge to the whole consideration whenever any joint buyer meets the additional-dwellings conditions. This applies to JT and TIC purchases equally; the structural choice does not avoid the trap. A spouse with a buy-to-let portfolio jointly buying a new family home with the other spouse triggers the 5% additional-dwellings surcharge on the family-home purchase regardless of whether the title is JT or TIC.
Spouse exemption availability
The IHT spouse exemption under IHTA 1984 s.18 applies to inter-spouse transfers (on lifetime gifts and on death) regardless of the title structure. JT survivorship and TIC will gift both qualify. The exemption is unlimited where both spouses are UK long-term residents; it is capped at the nil-rate band amount (currently £325,000) where the transferor is a UK long-term resident and the transferee is not, unless the non-LTR transferee makes an election under IHTA 1984 s.267ZA to be treated as LTR (with the consequence of bringing worldwide assets into UK IHT scope).
The IHT-side trap of holding investment property as joint tenants
The trap that catches landlord couples with material investment portfolios is the loss of nil-rate-band planning on first death. Two scenarios make the difference concrete.
Scenario A: Mr and Mrs Anderson hold a £600,000 rental property as joint tenants. Mr Anderson dies first. The property passes to Mrs Anderson by survivorship; the IHT charge is zero (spouse exemption, s.18). Mr Anderson's £325,000 nil-rate band is unused on this property. The whole property is now in Mrs Anderson's estate at £600,000. On her death, with the property still in the family, the survivor's NRB plus the transferable NRB from Mr Anderson covers £650,000; the property is just inside the NRB shelter (ignoring RNRB; the rental property does not qualify for the residence nil-rate band).
Scenario B: Same couple, same property, held as tenants in common 50/50 with a will-trust route. Mr Anderson dies first. His 50% share (£300,000) passes under his will into a discretionary trust for the family; the spouse exemption does not apply because the gift is to the trust, not the spouse. The £300,000 is within Mr Anderson's £325,000 NRB and the IHT charge is zero. Mr Anderson's NRB is used. Mrs Anderson holds her own 50% share (£300,000); the trust holds Mr Anderson's 50%. On her death, only her £300,000 is in her estate (plus her own NRB of £325,000 to apply). The trust holds the other £300,000 outside her estate. The family has effectively sheltered the full £600,000 across two nil-rate bands instead of one (with the transferable-NRB mechanic) plus the discretionary trust's onward planning flexibility.
The numbers depend on the property value, the rest of the estate, and the survivor's longevity. The mechanic is the same in every case: JT wastes the deceased's NRB on the property because survivorship overrides the will; TIC plus a will trust uses it.
When joint tenancy still makes sense
The case for joint tenancy is real but narrower than the conveyancer's default suggests. JT remains the right choice where all three of the following hold:
- The couple is married or in a civil partnership (so the spouse exemption covers the first-death IHT regardless of structure).
- The property is the owner-occupied family home, not a let property (rental income shifting is irrelevant; PPR covers the CGT side regardless of structure).
- The combined estate is comfortably within the available nil-rate bands including the residence nil-rate band where applicable, so the lost NRB planning on first death has no actual cost.
For couples whose circumstances change (an inheritance, a rental property added to the portfolio, a material rise in property value), the right response is to revisit the structure. Severance is unilateral, inexpensive, and reversible only in the loose sense; the practical position is that a couple who sever to TIC stay in TIC.
The five-step decision framework
Most landlord couples reach the same decision once they walk through the same questions. The framework:
- Is there rental income on the property? If yes, income-shifting may be valuable; TIC is needed to support Form 17. If no, the income side is neutral.
- Do the two of you have materially different marginal tax rates? If yes, the Form 17 lever is worth a meaningful amount each year; TIC is preferable. If no, the income side is neutral.
- Is the combined estate likely to exceed the nil-rate bands at second death? If yes, TIC plus a will trust on first death preserves a NRB; JT wastes it. If no, the IHT side is neutral.
- Is there a non-spouse beneficiary (typically children) you might want to leave a share to on first death? If yes, only TIC can do it (JT survivorship overrides the will). If no, the will side is neutral.
- Do the parties have unequal beneficial contribution to the property? If yes, only TIC can record the unequal share. If no, the structural choice can be 50/50 either way.
A "yes" on any one of the five questions is normally enough to push the decision to TIC. Couples reaching "yes" on three or four routinely have the structure already in place; the work is in the deed of trust, the wills, and the alignment of the two with the Form 17 strategy on the rental income. The structural decision is the first step, not the only one.