ATED Property Rental Business Relief: How the Mechanics Actually Work

Property Rental Business Relief is the relief most ATED-affected companies actually claim. It reduces the annual ATED charge to nil for any day on which the company is exploiting the dwelling as a source of rents in a property rental business, and it is the reason most corporate buy-to-let portfolios above the £500,000-per-property threshold pay no ATED in practice.

It is also the relief HMRC scrutinises most often when an ATED enquiry opens. Three components do the analytical work: the connected-person test in section 1122 CTA 2010, the commercial-terms test, and the day-by-day apportionment that governs voids, refurbishments, and any period of connected use. Each is easy to get wrong, and each carries its own clawback risk.

This page is the mechanics deep-dive on the relief. For the wider regime, including the 2026/27 chargeable amounts, valuation cycle, exemptions, the late-filing penalty cascade, and the strategic dis-envelope question, see our complete ATED guide for 2026/27.

The Statutory Test in Section 133 FA 2013

The relief lives in section 133 of the Finance Act 2013. The structure is that a day is a "relievable day" if, on that day:

1. The chargeable interest is being exploited as a source of rents or other receipts (typically a tenancy at market rent, but the section is wide enough to cover other commercial receipts derived from holding the property as part of a business);
2. The exploitation is being carried on in the course of a qualifying property rental business carried on by the holder; and
3. The let or proposed let is to a person not connected with the holder, on terms that would be expected between unconnected parties (the commercial-terms test).

All three limbs must be satisfied for a given day. The relief is calculated day-by-day, not month-by-month or year-by-year, which is why the apportionment around voids and connected occupation is the part most often miscalculated in practice.

The Connected-Person Test: Section 1122 CTA 2010

The single most under-appreciated feature of the rental relief is the breadth of the connected-person test. Section 1122 of the Corporation Tax Act 2010 catches a wider ring of persons than most landlords assume.

Individuals Connected with the Company

An individual is connected with a company if the individual (or another person connected with the individual) controls the company, where control is defined by reference to share ownership, voting power, or the ability to procure that the affairs of the company are conducted in accordance with the individual's wishes. A single-shareholder Ltd is controlled by that shareholder; a 50/50 husband-and-wife company is controlled by both spouses jointly.

Once an individual controls the company, the controller's relatives are also connected. The s.1122 definition of relative is:

• Spouse or civil partner;
• Parents and their spouses (so a step-parent is connected);
• Children, their spouses, and their grandchildren (so a son-in-law is connected, as is an adult child living independently);
• Siblings and their spouses (so a brother-in-law renting the flat at full market rent is still a connected person).

Aunts, uncles, cousins, and unmarried partners are not within the s.1122 definition. A property let to a controller's cousin on a commercial tenancy can qualify for the relief on that limb (the commercial-terms test still has to be passed independently).

Companies Connected with the Holder

Two companies are connected if the same person (or persons) controls both, or if a group of persons controls both. This catches intra-group lettings between sister property companies, and lettings to a personal trading company controlled by the same shareholder.

Partnerships and Trustees

A partnership is connected with any partner and with the relatives of any partner. Trustees of a settlement are connected with the settlor, with any beneficiary, and with the spouse or relative of either.

The implication for corporate landlords is that a property held in a Ltd company controlled by an individual cannot be let to that individual's family trust, to the individual's other companies, or to the individual's in-laws without breaking the relief for the period of use.

The Commercial-Terms Test

The second analytical hurdle is that the letting must be on terms an unconnected commercial landlord would offer an unconnected tenant. The principal indicators HMRC looks at are:

• Rent at open-market value. A formal rental valuation by a RICS-qualified surveyor (or an arm's-length lettings-agent valuation) at the start of the tenancy is the gold-standard evidence. A 10% to 15% discount on market rent has been accepted in some compliance cases where the tenant accepted a longer fixed term; a 50% discount has not.
• Tenancy agreement on standard market terms. A modern assured shorthold tenancy (or a periodic tenancy under the Renters' Rights regime once enacted) with standard market clauses on deposit, repairs, and notice. Bespoke clauses that depart materially from market norms (no deposit, indefinite rent freeze, tenant's right to deduct repair costs from rent without limit) attract scrutiny.
• Deposit and reference-checking practice consistent with arm's-length letting. A deposit held in a government-approved tenancy deposit scheme, written references, and credit-check evidence demonstrate market practice.
• Rent collected on the agreed schedule. Persistent rent arrears that are not chased through the normal route (Section 8 notices, possession claims) are evidence that the letting is not commercial in practice, even if the paperwork is correct.

The commercial-terms test bites independently of the connected-person test, but they often go together: where the tenant is connected, the rent and terms tend to drift away from market because no third party is policing the bargain.

Voids, Refurbishments, and Days That Still Qualify

The day-by-day structure of the relief means voids and refurbishments are not automatically disqualifying. A day still qualifies for relief if the dwelling is being prepared for letting or actively marketed for letting to unconnected third parties on commercial terms.

Standard Between-Tenancy Void

The typical void between tenants (cleaning, minor decoration, marketing for the next tenant) qualifies throughout. Practical evidence:

• Lettings-agent instruction letter dated within days of the outgoing tenancy ending;
• Rightmove or Zoopla marketing listing dates that bracket the void period;
• Invoices for cleaning, repair, or redecoration work between tenancies;
• Records of viewings during the void.

Major Refurbishment Between Tenancies

A multi-week refurbishment (kitchen replacement, full redecoration, compliance work such as electrical certification or remedial cladding) qualifies provided it is a normal incident of running the property rental business. The trigger is whether the work is being done to make the property lettable again, not whether the property happens to be empty.

Reconstruction, Change of Use, Non-Business Voids

A period during which the dwelling is being materially reconstructed (eg added storeys, knocked-through to a neighbouring property, converted to multiple units) is not a relievable day. The property is not being exploited as a rental source during the works.

A period during which the dwelling is held vacant for non-business reasons (typically: kept available for a future occupation by a connected person, held empty pending sale, used as storage by the controller) is also non-relievable, even where it is not occupied.

How the Relief Is Claimed on the ATED Return

The ATED return mechanics are the same as for any other relief, but two return formats are available depending on the portfolio shape:

Relief Declaration Return (One Return Covering Multiple Properties)

Where every dwelling in the company's portfolio qualifies for the same relief for the whole period, a single Relief Declaration Return is filed by 30 April naming Property Rental Business Relief and listing the properties. No charge is calculated; the return is purely a declaration that the relief applies to every listed property for every day of the period.

The Relief Declaration Return cannot be used where one dwelling has mixed-use days (some qualifying, some not), or where two dwellings qualify for different reliefs. In that case each dwelling needs its own ATED return.

Ordinary ATED Return with a Schedule of Reliefs

For a single-property company, or for a portfolio where dwellings have mixed-use days, an ordinary ATED return is filed and the Schedule of Reliefs section identifies the relievable and non-relievable days. The charge is calculated by reference to non-relievable days as a fraction of the year, multiplied by the annual charge for the property's band.

For the 2026/27 chargeable amounts by band, see the ATED complete guide for 2026/27.

Worked Example: £1.5m London Buy-to-Let in a Ltd Company

Putting the mechanics together with figures.

Facts. ABC Property Holdings Ltd, controlled by Mr Patel, owns one residential dwelling in Wandsworth valued at £1.5m on 1 April 2022 (the current ATED revaluation date). The property's 2026/27 band is "More than £1m, up to £2m" with an annual charge of £9,450. The company lets the property under an assured shorthold tenancy to Ms Okafor, an unconnected solicitor, at the open-market rent of £4,200 per month.

Year 1 (uneventful): Ms Okafor occupies the property for all 365 days of the chargeable period at market rent on standard AST terms. The company files a Relief Declaration Return on 27 April 2026 listing the property and the relief. ATED charge for the year: £0.

Year 2 (void between tenants): Ms Okafor moves out on 31 July 2026. The property is professionally cleaned and redecorated through August and listed on Rightmove from 4 August at £4,400 per month. A new tenant, Mr Hassan, signs on 19 September and moves in on 1 October.

• 1 April to 31 July: 122 relievable days (let to Ms Okafor).
• 1 August to 30 September: 61 relievable days (active marketing and short refurbishment, supported by agent instruction and Rightmove listing dates).
• 1 October to 31 March: 182 relievable days (let to Mr Hassan).
• Total relievable days: 365. ATED charge for the year: £0. Single Relief Declaration Return filed.

Year 3 (loss of relief mid-year): Mr Hassan gives notice on 31 December 2027. From 1 January 2028 to 31 March 2028 (91 days), Mr Patel's adult daughter moves into the property to study at a London university. She pays no rent. Mr Hassan was unconnected; the daughter is connected via s.1122 CTA 2010, and the occupation is not on commercial terms.

• 1 April to 31 December 2027: 275 relievable days (Mr Hassan).
• 1 January 2028 to 31 March 2028: 91 non-relievable days (connected occupation, no commercial terms).
• Apportioned ATED charge: 91 / 366 × £9,450 (using the 2027/28 band figure, indexed) ≈ £2,350.
• The company must file an ordinary ATED return with a Schedule of Reliefs (not a Relief Declaration Return), identifying 275 relievable days and 91 non-relievable days, and pay £2,350 within 30 days of the loss of relief.

The Year 3 illustration is the most common compliance failure pattern: families assume that a connected occupation "for a few months" can be absorbed into the annual return without consequence, and miss the 30-day window to file the amended return and pay the apportioned tax.

Loss of Relief and Clawback Pattern

The relief is not all-or-nothing for the year. Days that qualify reduce the charge for those days; days that do not bear their share of the annual charge. The mechanical sequence when relief is lost mid-year is:

1. Identify the first non-relievable day.
2. Count non-relievable days through to the end of the chargeable period (or to the next relievable day if use changes back).
3. Apply the apportionment: charge = (non-relievable days / days in period) × annual band charge.
4. File an amended return within 30 days of the loss of relief and pay the apportioned tax.
5. If use changes back to relievable later in the year (eg the connected person moves out and a third-party tenant moves in), update the return at year-end to capture the relievable-day count from the date of return-to-relief.

For overseas companies and complex portfolios the return mechanics interact with corporation-tax-on-chargeable-gains positions and the Register of Overseas Entities filing schedule. The interactions are out of scope here; the ATED return itself is the discrete trigger for the apportioned charge.

Record-Keeping and Defending an Enquiry

HMRC's ATED compliance activity is focused on relief-claim returns where the property has had connected-person occupation during the year. The records that defend the claim are:

• Tenancy agreements with unconnected tenants, dated and signed.
• Bank statements or agent statements showing rent received at the agreed rate.
• Marketing evidence during voids: agent instruction letters, Rightmove/Zoopla listing screenshots with dates, viewing logs.
• Refurbishment invoices for between-tenancy work, with dates that align with the void period.
• Council tax records showing the property was either occupied by a tenant or vacant-and-marketed (the council tax classification on void days is itself useful corroborating evidence).
• Utility records showing tenant usage during occupied periods.

Records must be kept for at least six years from the end of the chargeable period to which they relate, and longer where an enquiry is open.

What This Page Does Not Cover

The other ATED reliefs (Property Developer, Property Trader, Farmhouse, Employee Accommodation, Public-Access, Charity, Social Housing) follow a similar structural pattern but have their own qualifying tests. The full catalogue and the wider regime (bands, valuation, exemptions, penalties) are in the ATED complete guide for 2026/27.

Two specific Property Rental Business Relief failure modes have their own dedicated guides: the relief clawback caused by a non-qualifying-individual occupation event (with worked timelines and the apportioned-charge mechanics) is covered in our ATED relief clawback guide; the harder related-persons / market-rent question (when family or director-connected lettings at full market rent still fail the s.1122 CTA 2010 test, with 10 scenario-driven cases and the evidence pack HMRC expects to see on enquiry) is covered in our ATED relief related-persons and market-rent test guide.

The acquisition-side 15% flat-rate SDLT under Schedule 4A FA 2003 follows a parallel logic for rental businesses, but the SDLT clawback window is three years from acquisition rather than the day-by-day apportionment that governs ATED. The interaction is covered in a separate guide on the 15% flat-rate SDLT and ATED.

For the corporate-landlord-vs-individual question that often gets re-opened when ATED is in play, see our guides on corporation tax rates for property companies in 2026/27 and income tax rates for landlords in 2026/27.