The popular framing of ATED relief clawback as 'if a family member moves in, you lose the year's relief' understates the architecture by a factor of four. FA 2013 s.135 extends loss of relief into the next 3 subsequent chargeable periods unless a qualifying-use day under s.133(1)(a) intervenes. A single weekend of a director's daughter staying in the dwelling at year-end can poison the next 3 chargeable years of relief if the dwelling sits vacant or off-let pending refurbishment. The 4-week visit by an adult child between her own lettings can trigger a worst-case multi-year exposure of £128,800 of ATED on a £2.4m dwelling that would otherwise have been fully relief-covered.

The s.135 look-back rule additionally unwinds earlier days where a 'relevant person' was entitled, all the way back to acquisition, unless qualifying-use days intervene between the earlier day and the non-qualifying-occupation day. A vacant period does not intervene; only genuine commercial letting to an unconnected tenant interposes. The look-back has no statutory time limit; in principle, every vacant day since the dwelling was acquired is at risk if no qualifying-use day separates it from a later non-qualifying-occupation event.

The s.136 'non-qualifying individual' catalogue is wider than most owners assume. Eight categories cover the individual entitled to the interest, connected persons under ITA 2007 s.993, partnership members entitled as partnership members, settlors of any trust where the trustees hold the interest, relatives of those individuals or settlors (parents, grandparents, children, grandchildren, siblings), spouses or civil partners of those relatives, participants in collective investment schemes holding the interest, and persons connected to those participants. Multi-hop family connections are caught: the spouse of a settlor's sibling, the brother-in-law of a beneficial owner. Market rent does not cure the trigger; the s.136 catalogue test bites on the day of occupation regardless of rent paid.

This page walks the s.136 eight-category catalogue, the look-forward 3-period mechanic with worked arithmetic, the look-back unwind, the qualifying-use intervention requirement, mitigation patterns, the CIHC parallel under CTA 2010 s.18N(3), the s.163 adjusted-chargeable-amount return obligation, the penalty consequences if clawback is discovered late, and 14 of the most common questions. For the WHEN-can-relief-coexist-with-connected-party-let question and the market-rent positioning analysis, see our related-persons and market rent page. For the strategic-decision question of whether to envelop at all, see our ATED pros and cons page. For the penalty mechanics, see our ATED penalties and appeals page.

The s.136 non-qualifying individual catalogue

The catalogue runs across eight cumulative categories. Any occupant who falls within any one category is a non-qualifying individual; the categories are not mutually exclusive but only one match is needed to trigger s.135.

  1. Category (a): individual entitled to the interest (otherwise than as partnership member). The natural-person owner or beneficiary if the structure is direct. For corporate filers this category typically does not bite directly because the company is the entitled person, but other categories pick up the human counterparties.
  2. Category (b): persons connected with category (a). Anyone in the ITA 2007 s.993 connected-persons catalogue: relatives, spouses, business partners, controlled companies. For a corporate filer this catches connected persons of the company (controlling shareholders, controlled subsidiaries) and connected persons of any underlying beneficial owner.
  3. Category (c): partnership members entitled as partnership members to the interest. Every partner in a partnership-with-corporate-member structure is potentially in scope where the property is partnership-held.
  4. Category (d): settlors of any trust where the trustees hold the interest. Critically relevant for corporate trustees of offshore trusts (Jersey, Guernsey, Cayman, BVI) holding UK property for settlor-or-family use. The settlor's UK visits to the dwelling trigger s.135 even though the legal owner is the trustee.
  5. Category (e): relatives of category (a) or (d) individuals. Per the ITA 2007 s.994 relative definition: parents, grandparents, children, grandchildren, siblings. Step-relations and adopted relations are typically included under the s.994 definition.
  6. Category (f): spouses or civil partners of category (e) relatives. This is the multi-hop extension. The spouse of your settlor's brother, the wife of the beneficial owner's son, the civil partner of the director's sister, all caught.
  7. Category (g): participants in any collective investment scheme holding the interest. Relevant for fund and unit-trust structures: every CIS participant whose investment is allocated to the property is potentially in scope.
  8. Category (h): persons connected with category (g). Widens the CIS-participant reach to connected family and controlled-company chains.

The catalogue is wide. Most owners under-estimate categories (e) and (f). Multi-hop family connections (the spouse of your settlor's sibling) are within s.136 even though the relationship is not intuitive. Specialist pre-occupation analysis is essential before allowing any related-person use of the dwelling; the £200 cost of a specialist advice note is trivial compared to a multi-year ATED clawback exposure.

The look-forward 3-period mechanic: Rosewood Property Holdings Limited

Rosewood Property Holdings Limited (UK ltd-co holding a £2.4m London BTL; let to unconnected commercial tenants throughout 2022/23, 2023/24, 2024/25, 2025/26; s.133 relief claimed on each annual ATED return; relief approved). October 2026: the director's adult daughter (a Category (e) relative of a connected person under s.136) stays in the dwelling between tenancies for 4 weeks while looking for her own flat. No qualifying-use day under s.133(1)(a) occurs during her stay (the dwelling is vacant; the lease has expired).

The clawback trigger: the daughter is permitted to occupy the dwelling on each day of her 4-week stay. Each day is a non-qualifying-occupation day per s.135. Loss of relief for 2026/27: the 4 weeks in October 2026 plus every subsequent day in 2026/27 (until the next qualifying-use day) is not relievable. If the dwelling remains vacant through to a new commercial let starting 1 March 2027, the entire period from October 2026 to 28 February 2027 is unrelievable. ATED at £9,450 annual multiplied by (151 / 365) = approximately £3,910 chargeable for 2026/27 alone.

The look-forward 3-period extension per s.135 is the operative shock. The statute states that no subsequent day in that chargeable period, or in any of the subsequent 3 chargeable periods, can be treated as relievable unless a s.133(1)(a) qualifying-use day intervenes. The new commercial let starting 1 March 2027 is a qualifying-use day if (and only if) it genuinely meets the qualifying-rental-business test (commercial basis, view to profit, unconnected tenant). In the best-case interpretation, if the 1 March 2027 letting is unequivocally qualifying, only the 4 weeks of daughter-occupation plus the vacant period from late October 2026 to 28 February 2027 is unrelievable (around £3,910 ATED). Relief is restored from 1 March 2027; 2027/28, 2028/29 and 2029/30 are unaffected.

In the worst-case interpretation, if the 1 March 2027 letting is not qualifying (for example let to another relative, or to a connected company, or otherwise not on a commercial basis with a view to profit), the look-forward extension applies. 2027/28, 2028/29 and 2029/30 ATED of £9,450 per year (subject to indexation under s.101) equals around £28,350 of ATED would become payable across the 3 subsequent years. Adding the 2026/27 partial loss, the 4-week daughter visit potentially costs around £32,000 in lost relief. For a £2.4m dwelling at the £2m to £5m band the worst-case exposure scales to £128,800 in lost ATED relief across 4 chargeable years.

The operational lesson is that the period between commercial tenancies is the most-dangerous window for connected-person occupation. Even a brief visit can poison up to 3 subsequent chargeable years if no qualifying-use day reliably intervenes. The mitigation pattern (genuine arm's-length commercial letting to an unconnected tenant) is feasible but requires planning and lead-time; ad hoc connected-person stays during a vacant gap are the typical trigger event for the worst-case multi-year exposure.

The look-back mechanic: Ironwood Cayman Holdings Limited

Ironwood Cayman Holdings Limited (Cayman company holding a £4.5m London apartment; let to unconnected commercial tenants throughout 2022/23, 2023/24, 2024/25; s.133 relief claimed and approved on each ATED return). January 2026: the company's UBO (Mr Ironwood, ultimate beneficial owner via a Cayman trust where he is the settlor) visits London for 6 weeks while attending business meetings and uses the apartment for the duration. Mr Ironwood is a Category (d) settlor under s.136.

The clawback trigger: Mr Ironwood is permitted to occupy the dwelling on each day of his 6-week stay in January-February 2026 (in the 2025/26 chargeable period). Each day is a non-qualifying-occupation day per s.135.

The look-back mechanic operates as follows. The statute unwinds earlier days 'where a relevant person is entitled to the single-dwelling interest on that day', unless a s.133(1)(a) qualifying-use day intervenes between the earlier day and the non-qualifying-occupation day. The relevant person here is the company (entitled on Mr Ironwood's occupation day). Earlier-day analysis: the company has been entitled throughout 2022/23, 2023/24, 2024/25, 2025/26. Commercial letting throughout those years should be qualifying-use days per s.133(1)(a) if (and only if) the letting genuinely meets the qualifying-rental-business test. If yes, the commercial-letting days intervene between every earlier day and the January 2026 Mr Ironwood occupation day; the look-back is severed and no earlier-day relief is lost.

The trap is the vacant gap. If any of the earlier 'commercial letting' periods had vacant interludes (between tenants, during refurbishment, awaiting marketing), those vacant days are not qualifying-use days. They do not sever the look-back chain. Any earlier vacant days that were not separated from the January 2026 non-qualifying-occupation event by a qualifying-use day become retrospectively non-relievable, and the company owes ATED for those days.

Practical impact: if the company had a 3-month vacant period in 2024/25 between tenants, those 3 months become non-relievable in retrospect. ATED at 2024/25 figures (£32,200 annual for the £2m to £5m band; Ironwood's £4.5m dwelling falls in that band) multiplied by (90 / 365) = around £7,940 of retrospectively-payable ATED for 2024/25. Plus Sch 24 inaccuracy on the 2024/25 return (which claimed full relief): careless behaviour at the unprompted-disclosure-within-12-months floor of 0% if voluntarily disclosed; prompted 15% on HMRC enquiry; deliberate-not-concealed up to 70% (or 105% with the Category 3 Cayman uplift under Sch 24 paragraph 4A and SI 2011/975).

The s.163 ACA return obligation bites: the company must file an adjusted chargeable amount return for 2025/26 (where the relief was lost mid-period) and consider re-opening 2024/25 if material days are unwound. The operational lesson is that continuous commercial letting with no vacant gaps is the only fully-protective pattern against look-back. Even a brief vacant period creates exposure if a later non-qualifying-occupation event surfaces.

The qualifying-use intervention requirement

A qualifying-use day under FA 2013 s.133(1)(a) is one on which the dwelling is being exploited as a source of rents (other than excluded rents) in the course of a qualifying property rental business. The qualifying-rental-business test imports the commercial-basis-with-a-view-to-profit requirement; the case-law on the parallel BPR commercial-basis test (Pawson v HMRC [2012] UKUT 51 (TCC), Brander v HMRC [2010] UKUT 300 (TCC)) is cross-referenced interpretively, though not directly on ATED.

A vacant day is not a qualifying-use day. A non-qualifying-occupation day is not a qualifying-use day. A short-let to a connected party at market rent is not a qualifying-use day (the s.136 catalogue defeats the qualifying-rental-business test for the day, per the s.133 own-language structure). Only genuine commercial letting to an unconnected tenant on a commercial basis with a view to profit interposes.

The interpretive standard is fact-and-degree. A 4-week unconnected commercial letting at market rent through a regulated letting agent is unambiguously qualifying. A 4-day unconnected letting at a token rent over a long weekend is more borderline; HMRC may challenge whether 'commercial basis with view to profit' is met. The longer and more arm's-length the qualifying-use period, the more reliably it severs the look-forward or look-back chain. Where the dwelling has been let continuously to an unconnected tenant for 12 months at market rent, the qualifying-use status is unimpeachable.

The market-rent-to-relatives mitigation pattern (and why it fails)

Sycamore Holdings Limited (UK ltd-co holding a £1.8m London BTL; let to unconnected commercial tenants throughout). A director's nephew (a Category (e) relative of a connected person) is between rented flats in March 2026 and wants to stay in the BTL for 4 weeks. Sycamore's director seeks tax advice on whether the s.135 clawback can be mitigated by letting to the nephew at market rent.

The proposed structure runs as follows. Document the nephew's existing commercial tenancy ending date precisely (28 February 2026). Enter into a genuine arm's-length commercial AST with the nephew at full market rent (verified comparable evidence; standard AST terms; rent paid into a Sycamore-controlled account; deposit lodged; agent involvement if normally used). Run the nephew's letting for 4 weeks at market terms.

The critical interpretive question is whether letting to the nephew is a qualifying-rental-business day under s.133(1)(a). The s.133 qualifying-rental-business test requires commercial basis plus view to profit; the market rent plus arm's-length AST may satisfy this part. But the s.135 clawback also requires that the occupant not be a non-qualifying individual under s.136. The nephew is a Category (e) non-qualifying individual. Per s.133's own language, relief is denied if a non-qualifying individual is permitted to occupy; the s.136 catalogue test bites on the day of nephew-occupation regardless of market rent.

The conclusion is that market-rent letting to the nephew does not cure the s.135 trigger. The nephew is non-qualifying under s.136; days of his occupation are non-qualifying days; s.135 look-forward extension applies. Market rent is necessary but not sufficient. For the deeper analysis of when relief can coexist with related-persons letting and the role of market rent in the s.133(2) and s.18N parallel architecture, see our related-persons and market rent page.

The genuine mitigation pattern is to interpose a qualifying-use day with a non-Category-(s.136) tenant. A contractor unconnected with the owner, a colleague unconnected with the director, a third party at arm's length. The nephew cannot be the interpositioning tenant; only an unconnected tenant can. The pragmatic alternative for Sycamore's director is to arrange a third-party rental for the nephew (paid for personally or through other family resources) rather than using the BTL. The £4,600 to £32,200 annual ATED plus the 3-period look-forward exposure outweighs the short-term accommodation saving from using the company's dwelling.

The CIHC parallel under CTA 2010 s.18N(3): Pomegranate Holdings Limited

Pomegranate Holdings Limited (UK ltd-co; sole shareholder and director Ms Pomegranate; holds a £950,000 London flat let commercially to Ms Pomegranate's adult son Jacob on a formal AST at full market rent £42,000 a year; ATED s.133 relief claimed historically).

The ATED s.135 and s.136 analysis: Jacob is Ms Pomegranate's son, a Category (e) relative of a connected person, a non-qualifying individual under s.136. Each day of Jacob's occupation is a non-qualifying-occupation day. Look-forward 3-period extension applies. ATED relief is lost throughout Jacob's tenancy plus the look-forward 3 chargeable periods unless qualifying-use days intervene.

The parallel CIHC analysis at CTA 2010 s.18N(3): the s.18N(3) connected-occupant catalogue is distinct from s.136 but lists connected persons plus their spouses plus relatives of connected persons plus relatives' spouses. Jacob is a relative of Ms Pomegranate (who is a connected person of the company via her director and shareholder relationship); s.18N(3) catches him; the company's qualifying-purpose carve-out from CIHC treatment is defeated. The company is a CIHC, locked into the 25% main rate CT on rental profits and investment income, with no small-profits rate and no marginal relief.

Combined exposure over 4 chargeable years. ATED at £4,600 a year (band 1, £500k to £1m, £950k flat) multiplied by 4 years (current plus 3-period look-forward, subject to s.101 indexation across the period) equals around £18,400 of ATED that would otherwise have been £0 with relief. CT impact: £42,000 annual rental at 25% main rate equals £10,500 versus £42,000 at 19% small-profits rate equals £7,980, giving £2,520 of additional annual CT multiplied by 4 years equals £10,080 of incremental CT. Total 4-year incremental tax exposure: around £28,480 for letting to Jacob at market rent (when the alternative of letting to an unconnected tenant at the same rent would have produced £0 ATED and £7,980 CT a year).

The conflation trap is the assertion that s.18N(3) and s.136 are the same test. They are not. Both bite together for connected-person occupancy in enveloped UK residential property, but they have distinct statutory anchors, distinct catalogues (s.136 includes settlors and CIS participants; s.18N(3) does not) and distinct consequences (CT main-rate lock-in for s.18N(3); ATED relief loss for s.136). Specialist advice should cite both at the right level and not conflate.

The operational lesson from the Pomegranate example is that family-occupant arrangements in enveloped property are operationally the worst case for combined ATED and CT exposure. Strongly consider de-enveloping (see our ATED pros and cons page for the strategic decision) where long-term family use is intended. The de-enveloping mechanics (SDLT on distribution-in-specie, CGT on the company-to-shareholder transfer, possible market-value rebasing) need separate modelling but the steady-state tax efficiency of family-occupied property is materially better outside the corporate envelope.

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The s.163 adjusted-chargeable-amount return obligation

Where relief is gained or lost mid-period, an adjusted chargeable amount return is required under FA 2013 s.163, separately from the annual s.159 return. The ACA return must be filed within 30 days of the change in chargeable amount. Late filing triggers FA 2009 Sch 55 item 11B (the ATED ACA return item at the Table at paragraph 1) and the standard £100, £200, £300, £300 escalator plus tax-geared paragraph 5 and 6 uplifts. The Sch 55 escalator on the ACA return runs independently of any Sch 55 escalator on the annual s.159 return.

For clawback-triggered ACA returns the timing matters. The 30-day clock runs from the change in chargeable amount, which in clawback cases is the first day of non-qualifying occupation. Specialist representation should prepare the ACA return in parallel with the substantive analysis of the look-forward and look-back consequences; the ACA return is the operative compliance mechanism, and missing the 30-day window compounds the penalty position.

Penalty exposure from late-discovered clawback

Sch 55, Sch 56 and Sch 24 apply in parallel for clawback-triggered exposure. The late ACA return generates Sch 55 late-filing penalties. The under-declared chargeable amount on the original s.159 annual return generates Sch 24 inaccuracy. Sch 56 late-payment applies where ATED was not paid by the original due date on the unwound days. Offshore Category 2 or 3 uplift under Sch 24 paragraph 4A and SI 2011/975 applies for overseas-incorporated structures.

The disclosure-mitigation matrix is the operative lever. Unprompted disclosure within 12 months of the clawback-triggering event (typically the non-qualifying occupation) produces the lowest mitigation floor: 0% careless under Sch 24 paragraph 10. Prompted disclosure (after HMRC OTM letter, formal enquiry or discovery assessment) is 15% careless minimum. Voluntary disclosure pre-OTM-letter via HMRC's Digital Disclosure Service or formal disclosure letter is the standard route. For the full Sch 55, Sch 56 and Sch 24 architecture, see our ATED penalties and appeals page.

Frequently asked questions

The FAQ list above covers the s.135 trigger, the s.136 eight-category catalogue, the 4-week-visit worst-case arithmetic, the market-rent-to-relatives misframing, the qualifying-use intervention requirement, the no-time-limit look-back rule, the settlor Category (d) trap for offshore-trust structures, the s.163 ACA return obligation, the developer-chain s.139 parallel, the CIHC interaction at CTA 2010 s.18N(3), the penalty consequences of late-discovered clawback, the visit-versus-occupation evidence standard, the vacant-gap-and-look-back combined exposure, and the pre-occupation specialist-advice protocol. For the related-persons-and-market-rent decision page, see our related-persons and market rent page. For the strategic-decision question of envelopment versus de-envelopment, see our ATED pros and cons page.

Next step

If you hold an enveloped UK residential dwelling claiming ATED relief and you are contemplating any occupation involving a director, family member, settlor, partnership member or other connected person, the s.135 look-forward and look-back architecture means a single day of non-qualifying occupation can trigger up to 4 chargeable years of lost relief. The s.136 catalogue is wider than most owners assume; the qualifying-use intervention requirement is strict; the s.163 ACA return obligation is mandatory. Specialist tax advice ahead of any planned related-person occupation is the operational protective measure. Contact us via the form below to discuss your specific position.