CGT on Property Transfers Between Spouses: How the s.58 Mechanic Actually Works

A transfer of property between spouses or civil partners who are living together is a no-gain no-loss disposal under TCGA 1992 s.58. No CGT crystallises on the transferring spouse. The receiving spouse takes over the original base cost (not market value) and is treated as if they had acquired the property on the same date as the transferring spouse. CGT crystallises only on the eventual sale to a third party.

That single mechanic underpins most spouse-side property tax planning: portfolio rebalancing across two AEAs and two basic-rate bands before sale, income-shifting through Form 17 declarations of unequal beneficial interest, and pre-sale restructuring of mortgaged BTLs. What catches you mid-planning is not the s.58 mechanic itself, which is straightforward, but the interactions: the SDLT debt-assumption trap on mortgaged transfers, the joint-tenancy bar on Form 17, the one-residence-per-couple rule for PRR, and the post-FA-2025 long-term-resident framework for the IHT spouse exemption.

If you are separating or divorcing, the statutory window is different (the s.58(1A) to (1D) post-separation extension, s.225B PRR retention, Mesher orders). That sits in the companion CGT on property transfers in divorce page. Everything here assumes you are still living together.

What do you actually want to do?

Your starting point depends on the goal. Each row points to the detail for that mechanic.

What you want to do	How it works	Where the detail is
Shift rental income from a higher-rate spouse to a lower-rate spouse	Change underlying beneficial ownership (declaration of trust), then file Form 17 to declare the new unequal split for income tax	Form 17 mechanics + declaration of trust
Use both spouses' AEAs and basic-rate bands before selling a property with a big embedded gain	Transfer a beneficial share under s.58 before sale; receiving spouse uses own AEA + band at disposal	Worked examples here + the CGT calculation walkthrough
Decide whether to file Form 17 at all (versus relying on the 50/50 default)	Compare the 50/50 default income split with the unequal split, factoring in MTD threshold timing and rate differentials	Form 17 vs default 50/50 decision
Sever a joint tenancy so the property is held as tenants in common (a prerequisite for unequal Form 17 splits)	Notice under Law of Property Act 1925 s.36(2) in England + Wales; equivalents in Scotland + Northern Ireland	Joint tenants vs tenants in common
Plan around the one-main-residence-per-couple rule for PRR purposes	s.222(5) nomination, s.222(6) one-residence rule, deemed occupation periods	Joint-ownership PRR mechanics
Understand the IHT spouse exemption (especially where one spouse is not a UK long-term-resident)	s.18 IHTA 1984, s.267ZA election, post-FA-2025 long-term-resident framework	IHT joint ownership + spouse exemption
Buy a second property jointly with a spouse who already owns another dwelling	FA 2003 Sch 4ZA para 2(3) joint-buyer aggregation: any one spouse triggers the additional-dwellings rate on the whole transaction	SDLT joint-buyer aggregation
Understand the CGT position for civil partners (identical to spouses on every operative reference)	Civil Partnership Act 2004 imported the matrimonial tax framework wholesale; s.58 names civil partners alongside spouses	Civil partnerships joint property ownership
Transfer to a spouse in the context of separation or divorce (different statutory window applies)	s.58(1A) to (1D) post-separation extension + s.225B PRR retention + Mesher mechanic	CGT on property transfers in divorce

The s.58 mechanic in detail

The operative wording of TCGA 1992 s.58(1) is that disposals between spouses or civil partners living together are treated as made for "such consideration as would ensure that neither a gain nor a loss accrued to the party making the disposal". The receiving spouse acquires at the transferring spouse's base cost. The CGT clock continues to run against that original base cost on any subsequent disposal.

The "living together" requirement is set out in TCGA 1992 s.288: spouses or civil partners are treated as living together unless they are separated under a court order, by deed of separation, or in circumstances likely to be permanent. A trial separation you later resume from is not a separation for s.58; a clear and intended-to-be-permanent move out is. If you live in different places for work reasons but remain in the relationship, you are still treated as living together; physical cohabitation is not required.

Once you cease to be "living together" as defined, the s.58(1) window closes at the end of that tax year. The Finance (No. 2) Act 2023 c.30 s.41(2)(6) extension (s.58(1A) to (1D), in force 6 April 2023) keeps no-gain no-loss treatment running for a further three tax years after the year of separation, and indefinitely under s.58(1D) where the disposal is under a court order or formal separation agreement. The divorce page works through those rules.

Worked example 1: pre-sale transfer to use both AEAs and band capacity

Imran owns a London buy-to-let in his sole name. He bought it in 2018 for £320,000 (plus £14,000 of acquisition costs). The market value in March 2026 is £450,000. He plans to sell in early 2027. His 2026/27 income is £92,000 (higher-rate). His wife Reema has employment income of £30,000 in 2026/27 (basic-rate band remaining: £20,270).

Imran transfers a 50 per cent beneficial interest to Reema in April 2026 via a declaration of trust (the legal title remains in his sole name; the beneficial title becomes 50/50). Under s.58 the transfer is no-gain no-loss. Reema now has a 50 per cent share with a 50 per cent slice of the original base cost (£167,000). The property is sold in March 2027 for £455,000 with £12,000 of disposal costs.

Joint gain: £455,000 − £12,000 − £334,000 = £109,000

Each spouse's share of gain: £54,500

Less each spouse's £3,000 AEA: £51,500 taxable per spouse

Imran (higher-rate throughout): £51,500 × 24% = £12,360

Reema:

• Basic-rate band remaining: £20,270
• Portion at 18%: £20,270 × 18% = £3,648.60
• Portion at 24%: (£51,500 − £20,270) × 24% = £31,230 × 24% = £7,495.20
• Reema's total: £11,143.80

Combined CGT after transfer: £12,360 + £11,143.80 = £23,503.80

If Imran had sold in his sole name without the transfer, the full £109,000 gain less £3,000 AEA = £106,000 taxable at 24 per cent (higher-rate throughout) = £25,440. The transfer-then-sell route saves £1,936.20 by accessing Reema's second AEA and basic-rate band slice. The saving widens as the gain grows; a £300,000 gain split the same way would save approximately £5,000 on the basic-rate band slice and double AEA.

Worked example 2: transferring a mortgaged property and the SDLT trap

Same setup as Example 1, except the property is mortgaged. Imran owns the London BTL in his sole name with a £280,000 outstanding mortgage. He wants to transfer a 50 per cent beneficial share to Reema via declaration of trust. Reema is added to the mortgage as a co-borrower at the same time (a lender requirement; lenders will not allow the beneficial ownership to move to a non-borrower).

CGT side (s.58): the transfer is no-gain no-loss. Reema takes a 50 per cent beneficial share with a 50 per cent slice of the original base cost. No CGT consequence on the transfer itself.

SDLT side (FA 2003 Schedule 4 paragraph 8): Reema assumes a 50 per cent share of the £280,000 mortgage = £140,000 of assumed debt. The assumed debt is chargeable consideration for SDLT.

Chargeable consideration	£140,000
SDLT main rates on £140,000 (residential, no surcharge): 0% to £125,000 + 2% on the next £15,000	£300
Additional 5% surcharge IF Reema already owns another dwelling (additional dwellings)	£7,000
Total SDLT in the no-other-dwelling case	£300
Total SDLT where Reema already owns another dwelling	£7,300

The same arithmetic applies in Wales under LTTA 2017 with the relevant LTT bands and surcharge, and in Scotland under LBTT(S)A 2013 with the relevant LBTT bands and the Additional Dwelling Supplement. The trap is that the CGT exemption under s.58 says nothing about SDLT, and Sch 4 para 8 catches the assumed debt as chargeable consideration even where no money changes hands between the spouses. Model the SDLT (or LTT, or LBTT) position before your conveyancing instructions go out. Our guide to the declaration of trust works through this trap in full.

Worked example 3: civil partner transferring to a non-UK-resident civil partner

Hugo and Sam are civil partners. Hugo lives in the UK and is UK-resident under the Statutory Residence Test. Sam relocated to Singapore in October 2024 and is non-UK-resident for 2025/26 and 2026/27. Hugo and Sam remain in a continuing civil partnership; they are not separated. Hugo owns a Manchester buy-to-let acquired in 2015 for £180,000.

Hugo transfers the property to Sam in June 2026 by registered TR1. The market value at transfer is £260,000.

CGT position (s.58): the transfer is no-gain no-loss. s.58 turns on whether Hugo and Sam are living together as civil partners under the s.288 definition; their geographic separation for work reasons does not break "living together" provided the partnership is intact. Sam takes the property at the £180,000 base cost.

IHT position (s.18 IHTA 1984 + s.267ZA election): the transfer is an inter-civil-partner gift. s.18 IHTA 1984 spouse exemption applies, but s.18(2) imposes a £325,000 lifetime cap on transfers from a UK long-term-resident donor to a non-long-term-resident donee. Whether Sam qualifies as a "long-term resident" under the post-FA-2025 framework depends on Sam's 20-year residence history. If Sam was UK-resident for at least 10 of the 20 tax years before 2025/26, the long-term-resident test is met and full unlimited s.18 exemption applies. If not, the £325,000 cap applies unless Sam elects under s.267ZA to be treated as long-term-resident (which brings Sam's worldwide assets into UK IHT scope). Our IHT and the spouse exemption guide covers this framework in full.

SDLT position: if the property is unmortgaged or Sam does not assume any mortgage debt, no SDLT applies. If mortgage debt is assumed, the Sch 4 para 8 rule catches the assumed amount as chargeable consideration; the 5 per cent additional dwellings surcharge can be in scope depending on Sam's other property holdings.

Subsequent disposal by Sam (non-UK-resident): Sam falls within the non-resident CGT regime under TCGA 1992 s.1A and Schedule 1A. Any subsequent disposal of the UK property triggers the 60-day CGT on UK property return for every disposal regardless of whether tax is due. Detail in our non-resident CGT page.

Worked example 4: transferring to a spouse who already has capital losses

Priya owns a Bristol buy-to-let acquired in 2014 for £140,000. The market value in 2026 is £230,000. She plans to sell in late 2026. Her income for 2026/27 is £75,000 (higher-rate throughout). Her husband Adam is a basic-rate taxpayer at £42,000 of employment income (basic-rate band remaining: £8,270) and carries £18,000 of brought-forward capital losses from a 2024/25 share disposal.

Priya transfers a 50 per cent beneficial share to Adam in May 2026. Under s.58 no-gain no-loss. They sell the property in November 2026 for £232,000 with £6,000 of disposal costs.

Joint gain: £232,000 − £6,000 − £140,000 = £86,000

Each spouse's share: £43,000

Priya (higher-rate): £43,000 − £3,000 AEA = £40,000 taxable × 24% = £9,600

Adam:

• Share of gain: £43,000
• Less own £18,000 brought-forward capital losses (compulsory offset to bring gain to AEA, but here the loss exceeds the gain less AEA): £43,000 − £18,000 = £25,000
• Less Adam's £3,000 AEA: £22,000 taxable
• Basic-rate band remaining: £8,270 × 18% = £1,488.60
• Higher-rate slice: (£22,000 − £8,270) × 24% = £13,730 × 24% = £3,295.20
• Adam's total: £4,783.80

Combined CGT after transfer: £9,600 + £4,783.80 = £14,383.80

If Priya had sold in her sole name without the transfer, the full £86,000 gain less £3,000 AEA = £83,000 taxable at 24 per cent = £19,920. The transfer-then-sell route saves £5,536.20 by accessing both Adam's brought-forward losses (which Priya could not have used) and Adam's basic-rate band capacity. Brought-forward losses belong to the spouse who realised them and cannot be transferred between spouses; the only way to use Adam's losses against this gain is to route part of the gain through Adam, which the s.58 transfer enables.

The five traps that catch people mid-planning

None of these is the s.58 mechanic. They are the interactions around it, and each is where a clean CGT transfer goes wrong.

• The SDLT debt-assumption trap. FA 2003 Schedule 4 paragraph 8 treats assumed mortgage debt as chargeable consideration. A 50/50 transfer of a £400,000 BTL with a £250,000 mortgage means £125,000 of assumed debt, with SDLT (and the 5 per cent additional dwellings surcharge where applicable) on that £125,000. It catches mortgaged transfers even where the CGT side is clean. See our declaration of trust guide.
• The joint-tenancy bar on Form 17. Joint tenants own undivided 100 per cent interests, not divisible shares. You cannot file Form 17 declaring an unequal split until you sever to tenants in common. Severance is by notice under Law of Property Act 1925 s.36(2) in England + Wales; equivalents elsewhere. See joint tenants vs tenants in common.
• The Form 17 sham trap. Form 17 declares the existing unequal beneficial ownership; it does not create one. A purported 90/10 declaration on a property held 50/50 beneficially is invalid. HMRC's standard enquiry asks for the declaration of trust that evidences the unequal split, and a Form 17 filed without an underlying deed is the classic defect. See our Form 17 guide.
• The s.222(6) one-residence-per-couple rule. Spouses or civil partners living together can have only one main residence between them for PRR purposes. A spouse transfer does not change that; PRR follows actual residence, not beneficial share. If you buy a second home and assume each of you can claim PRR on a separate property, you are wrong. See our joint-ownership PRR guide.
• The s.18 IHTA long-term-resident framework (post-FA-2025). The historic "non-domiciled spouse" framework ended on 6 April 2025. The s.18 spouse exemption is now residence-conditional on the long-term-resident test (10 consecutive tax years, or 10 of the preceding 20). Transfers to a non-long-term-resident spouse are capped at £325,000 lifetime unless the donee elects under s.267ZA. The s.58 CGT exemption is NOT residence-conditional; the IHT side is, and this is where pre-2025 guidance often misleads. See our IHT joint-ownership guide.

What counts as "living together"?

TCGA 1992 s.288 defines "living together" as the default state for spouses or civil partners, broken only by separation under a court order, by deed of separation, or in circumstances likely to be permanent. Three points decide whether the door is open:

• Geographic separation is not separation. If you live in different cities or countries for work reasons, you remain "living together" for s.58 purposes provided the relationship is intact. The mechanic applies to transfers between you regardless of who is where.
• Trial separation is not separation. A move-out followed by reconciliation does not break "living together" retrospectively. The test is whether the move-out was intended to be permanent at the time.
• Permanent separation is. A move-out intended to be permanent closes the s.58(1) tax year window at the end of that tax year, and opens the s.58(1A) to (1D) post-separation window, which the divorce page covers.

The HMRC manual section on the s.288 definition is HMRC's TSEM7700 series; the published gov.uk consumer page on capital gains tax on gifts at gov.uk/capital-gains-tax/gifts restates the basic spouse exemption. Note that the consumer page does not yet reflect the post-6-April-2023 statutory framework introduced by Finance (No. 2) Act 2023; for the separation rules use HMRC helpsheet HS281 (Capital Gains Tax, civil partners and spouses) at gov.uk.

What s.58 is not

The s.58 mechanic does specific things; it does not do others. Three common misreadings worth excising:

• s.58 is not a gift relief. Gifts to children, parents, siblings or any non-spouse are NOT covered by s.58. They are market-value disposals under TCGA 1992 s.17 (connected persons) and crystallise CGT on the deemed gain. Gifts of business assets may qualify for s.165 holdover; gifts into trust may qualify for s.260 holdover. Detail in our gifting property to family members page.
• s.58 is not Form 17. s.58 is the CGT-side no-gain-no-loss mechanic. Form 17 is the income-tax-side election that declares unequal beneficial ownership for the 50/50 default rule. They often work together but are not interchangeable. See our Form 17 guide.
• s.58 is not unlimited after separation. Once the spouses cease "living together", the s.58(1) window closes at the end of that tax year. The Finance (No. 2) Act 2023 extension keeps the mechanic running for a further three tax years (s.58(1A) to (1C)) or indefinitely under court order (s.58(1D)), but the unconditional living-together version of s.58 ends at the end of the tax year of separation. Cohabitee-to-cohabitee (unmarried) transfers are outside s.58 altogether and are at market value. Detail in our unmarried co-owners page.

SDLT and the spouse joint-buyer aggregation rule

A separate SDLT point comes up where you and your spouse are buying a property together (rather than transferring an existing property between yourselves). FA 2003 Schedule 4ZA paragraph 2(3) provides that if any joint buyer meets the additional-dwellings conditions, the whole transaction is at the higher rate (5 per cent surcharge). The same any-buyer-triggers-whole-transaction rule applies to Welsh LTT under LTTA 2017 Schedule 5 and to Scottish LBTT under LBTT(S)A 2013 Schedule 2A paragraph 4.

The classic trap is a first-time buyer marrying someone who already owns a BTL portfolio. First-time-buyer status is lost the moment the joint purchase completes, and the additional-dwellings rate applies to the whole transaction in full. If one of you owns a portfolio and the other is a first-time buyer, buying a starter home together can be an expensive surprise. See our SDLT joint-buyer aggregation guide.

Related life events on the spouse side

• Inheriting and then transferring to a spouse. The deceased's property passes to the personal representatives under TCGA 1992 s.62 at the death-uplift value, and the beneficiary takes it at the same death-uplift value via assent. A subsequent transfer between cohabiting spouses is then no-gain no-loss under s.58 at the inherited base cost. See our CGT on inherited rental property guide.
• Separating or divorcing. s.58(1A) to (1D) and s.225B apply; the detail is in our CGT on property transfers in divorce guide.
• Death of one spouse during a planned transfer. Death is itself a chargeable-event-free uplift under s.62. A planned s.58 transfer that is interrupted by the transferring spouse's death sees the property fall into the estate at the date-of-death value; the receiving spouse may then inherit at that value under the will or intestacy, with the same death-uplift effect. The s.58 mechanic does not survive death; the s.62 mechanic takes over.

Records to keep

Retain the standard property records and the spouse-transfer-specific evidence:

• Original purchase contract, completion statement, SDLT (or LTT, or LBTT) return and legal invoices: the source of the original base cost the receiving spouse inherits
• The transfer deed (TR1) and Land Registry record of the change of ownership
• The declaration of trust where the beneficial ownership differs from the legal ownership, particularly if Form 17 has been filed declaring an unequal split
• Form 17 itself, with the signature dates of both spouses (the 60-day filing window runs from the later signature)
• Contemporaneous evidence of "living together" for the s.288 test (council tax, utility bills, electoral roll)
• Mortgage documentation showing whether the receiving spouse assumed any share of the loan (the trigger for the Sch 4 para 8 SDLT trap)
• Any s.222(5) nomination on either side, with effect dates (for the PRR one-residence rule)
• Original purchase improvement invoices that have been added to the base cost

HMRC's retention standard for business taxpayers is five years and 10 months from the end of the tax year of the eventual disposal by the receiving spouse. In practice, retain the spouse-transfer evidence indefinitely, because the receiving spouse may hold the property for many years before disposal and the inherited base cost figure may need to be evidenced decades after the transfer.

Where to go next

The operational mechanics each have their own guide:

• Form 17 mechanics: 60-day filing window, signature requirements, persistence rules, joint-tenancy bar
• Declaration of trust: the underlying ownership document, format requirements, the SDLT debt-assumption trap in detail
• Joint tenants vs tenants in common: structural choice, severance routes, tax consequences
• Form 17 vs default 50/50 decision: when to file, when to stay at default
• Civil partnerships: identical framework to spouses
• Unmarried co-owners: where s.58 does not apply
• Joint-ownership PRR mechanics: s.222(5) nomination, s.222(6) one-residence rule
• IHT joint ownership + spouse exemption: post-FA-2025 long-term-resident framework
• SDLT joint-buyer aggregation: any-buyer-triggers-whole-transaction

For the wider CGT picture: the CGT on UK property complete guide, CGT rates 2026/27, the CGT annual exempt amount, the CGT calculation walkthrough, and gifting to non-spouses.