SDLT Linked Transactions UK — Stamp Duty on Multiple Property Purchases

What Are Linked Transactions? — FA 2003 s.108

FA 2003 s.108 provides that transactions are 'linked' if they form part of a single scheme, arrangement, or series of transactions between the same vendor and purchaser (or persons connected with them). The key elements: (a) Same vendor and purchaser: the buyer and seller (or persons connected with them) in all the transactions must be the same; 'connected persons' for SDLT is defined in FA 2003 s.1122 by reference to CTA 2010 s.1122 — this covers companies under common control; spouses and civil partners; relatives; and companies associated with those persons; (b) Single scheme, arrangement, or series: the transactions must be linked by a common arrangement or purpose — they must be part of a plan to transfer multiple properties; the fact that the transactions have separate contracts and complete on different dates does not prevent them from being linked if they are part of the same commercial arrangement; (c) No 'substantial independent commercial purpose' defence: unlike some other anti-avoidance provisions, there is no statutory carve-out for commercially motivated transactions — HMRC can link transactions even if there is a genuine commercial reason for each individual transaction; (d) Anti-fragmentation: the linked transactions rule is specifically designed to prevent buyers from artificially splitting a portfolio purchase into multiple smaller transactions to benefit from the lower SDLT thresholds that would apply to each smaller purchase. Examples of linked transactions: (i) buying a portfolio of 10 flats from the same developer over 6 months, all part of a single development scheme; (ii) buying a house and a separate garage/parking space from the same seller on the same day; (iii) buying three adjacent plots from the same developer for a self-build project; (iv) a company and its director each buying a property from the same seller as part of a single deal. Examples of what are NOT linked transactions: (i) buying from the same builder on a standard open-market basis, each purchase independent and at arms' length, with no cross-references in the contracts and different completion dates; (ii) buying two unrelated properties from unconnected sellers, even if on the same day.

• FA 2003 s.108: transactions are linked if they form part of a single scheme, arrangement, or series between the same vendor and purchaser (or connected persons)
• Connected persons: spouses/civil partners; relatives; companies under common control; companies connected with those individuals — all connected persons count as the 'same' buyer or seller
• Single scheme or arrangement: the test is whether there is a common plan to transfer multiple properties — separate contracts and different completion dates do not prevent linking if the transactions are part of the same commercial plan
• Anti-fragmentation purpose: the rule is specifically designed to prevent buyers splitting portfolio purchases into smaller transactions to fall below SDLT thresholds
• No commercial purpose defence: unlike some other anti-avoidance rules, there is no statutory carve-out for commercially motivated transactions — HMRC can link transactions even with a genuine commercial reason for separate contracts

Effect of Linking — Aggregate Consideration and SDLT Calculation

Where transactions are linked, the SDLT is calculated on the total (aggregate) consideration for all the linked transactions combined (FA 2003 s.108(2)). The aggregate consideration determines: (a) which SDLT rate/threshold applies (residential SDLT is charged on a slice basis — 0%, 2%, 5%, 10%, 12%); and (b) whether the additional dwellings surcharge (ADS — 5% from 31 October 2024 on additional residential properties) applies; and (c) whether multiple dwellings relief (MDR) is beneficial. The SDLT is then allocated proportionately between the linked transactions according to the consideration for each individual property. This means: if a buyer purchases 10 flats for £200,000 each (£2 million total), each flat individually falls below the basic rate threshold — but if HMRC treats them as linked, the 10% and 12% rates apply to the aggregate £2 million total, and the total SDLT is calculated on the £2 million with the result allocated equally. Multiple dwellings relief (MDR) interaction: where two or more dwellings are purchased as linked transactions, MDR under FA 2003 Schedule 6B may be available — MDR calculates the SDLT on the average price per dwelling (the aggregate consideration divided by the number of dwellings), and applies the SDLT rates to that average; this can significantly reduce the overall SDLT charge on portfolio purchases compared with applying the top-rate slabs to the full aggregate consideration. Example: buying 6 flats linked for £1.2 million total — without MDR, SDLT on £1.2 million at combined slabs; with MDR, SDLT on £200,000 average × 6 flats (potentially at much lower effective rates). Minimum tax in MDR: MDR is subject to a minimum SDLT charge of 1% of the aggregate consideration — this prevents MDR from reducing SDLT to zero even on very high-value multi-dwelling transactions.

• Aggregate consideration: where transactions are linked, SDLT is calculated on the total aggregate consideration for all linked transactions combined — allocating the higher-rate SDLT slabs to the whole portfolio
• Additional dwellings surcharge (ADS): at 5% from 31 October 2024 on additional residential properties above the buyer's only or main residence; ADS applies to each linked residential transaction; applies on the aggregate consideration
• Multiple dwellings relief (MDR) interaction: MDR calculates SDLT on the average price per dwelling (aggregate ÷ number of dwellings); available on linked transactions involving 2+ dwellings; can significantly reduce total SDLT on portfolio purchases
• MDR minimum tax: 1% of aggregate consideration — MDR cannot reduce SDLT below 1% of the total purchase price even for very low-value per-dwelling portfolios
• Proportionate allocation: where SDLT is calculated on the aggregate, the resulting tax is allocated proportionately between the linked transactions based on each property's individual consideration

Linked Transactions for Commercial Property and Mixed-Use

The linked transactions rules apply equally to commercial property SDLT and to mixed-use (part residential, part commercial) transactions, but the thresholds and rates differ: Commercial SDLT rates (from 1 January 2024): 0% up to £150,000; 2% on £150,001–£250,000; 5% on the remainder (above £250,000). Linked commercial transactions: if multiple commercial properties are purchased from the same seller as part of a single arrangement, the aggregate consideration is used to determine the rate — the same principle as residential. Commercial lease SDLT: where a lease is linked with another transaction (e.g. purchase of the freehold plus grant of a new lease of part of the same building), the consideration for the linked transactions is aggregated; commercial lease SDLT (on the Net Present Value of the total rent — FA 2003 s.56) is calculated separately from the premium SDLT but both are considered within the linked transactions framework. Mixed-use properties: where a transaction includes both residential and non-residential elements (e.g. a shop with a flat above), the SDLT is calculated at non-residential rates on the whole (mixed-use) consideration — this can be significantly lower than residential rates; where multiple mixed-use properties are purchased as linked transactions, the aggregate consideration is aggregated and the non-residential rates apply; MDR is not available on mixed-use transactions (only on exclusively residential). Annual Tax on Enveloped Dwellings (ATED): not directly part of SDLT but relevant to linked transactions planning — where multiple residential properties worth over £500,000 are held in a company, ATED applies annually; purchasing via a company rather than personally changes the SDLT analysis (15% flat SDLT rate on high-value residential purchases by companies). LBTT (Scotland): Scotland's Land and Buildings Transaction Tax (Revenue Scotland) has its own linked transactions rules under LBTT(S)A 2013 s.23 — materially similar to the FA 2003 rules but with different thresholds and rates. LTT (Wales): the Land Transaction Tax (Wales Act 2017) has its own linked transactions rules — again materially similar but with different thresholds.

• Commercial SDLT: linked commercial transactions are aggregated; non-residential rates apply (0% to £150,000; 2% to £250,000; 5% above £250,000); no additional dwellings surcharge on commercial property
• Mixed-use transactions: non-residential (commercial) SDLT rates apply to the whole consideration where a transaction includes any non-residential element; typically lower overall SDLT than residential rates; MDR not available
• Commercial lease SDLT: lease SDLT (on NPV of rent) is calculated separately from premium SDLT; both are considered within the linked transactions framework where there is a linked purchase and lease
• LBTT (Scotland): Revenue Scotland applies its own linked transactions rules under LBTT(S)A 2013 s.23 — same principles but different thresholds and rates; ADS at 6% in Scotland on additional residential properties from 5 April 2024
• LTT (Wales): similar linked transactions rules under Wales Act 2017; Welsh Government sets its own LTT rates and thresholds; higher residential rates (HRTL — higher residential transaction levy) applies to additional dwellings in Wales

SDLT Return Filing and HMRC Enquiries — Practical Compliance

Every chargeable SDLT transaction (including linked transactions) must be reported by filing an SDLT return (SDLT1 — and supplementary returns SDLT2, SDLT3, SDLT4 where required) within 14 days of completion. For linked transactions: (a) each transaction must be reported on a separate SDLT return; (b) the return must identify that the transaction is linked (Box 9 of the SDLT1); (c) the aggregate consideration must be shown; (d) the SDLT must be calculated on the correct aggregated basis; (e) where MDR is claimed, it must be explicitly claimed on the SDLT return (Box 9 — claim for relief). Amendments: SDLT returns can be amended within 12 months of the filing deadline. Late filing penalty: £100 for a return more than 30 days late; £200 for more than 3 months late; tax-geared penalties after 12 months. HMRC enquiry powers: HMRC can open an enquiry into an SDLT return within 9 months of the filing date; the enquiry period extends where the return was filed late or where the mistake was fraudulent or careless. HMRC challenges: HMRC has actively challenged transactions where buyers have treated what HMRC regards as linked purchases as separate transactions — particularly where: multiple properties are bought from the same developer on a phased basis; connected persons each buy a property from the same seller; portfolio purchases are structured across multiple contracts to avoid SDLT thresholds. Professional advice: any transaction involving multiple properties from the same seller should be reviewed by a specialist SDLT adviser before completion to determine whether the linked transactions rules apply and whether MDR or other reliefs are available.

• 14-day filing deadline: SDLT return must be filed and SDLT paid within 14 days of completion; late filing penalties apply from day 15 (£100) and day 31 (£200)
• Linked transaction disclosure: each linked transaction must be reported on a separate SDLT return with Box 9 identifying the link; aggregate consideration and the resulting SDLT must be shown
• MDR claim: where multiple dwellings relief is claimed on linked transactions, it must be explicitly stated on the SDLT return at the time of filing (or on amendment within 12 months)
• 12-month amendment window: SDLT returns can be amended within 12 months of the filing deadline — use this to correct errors in the linked transactions analysis discovered after completion
• HMRC enquiry risk: HMRC actively challenges artificially split portfolio purchases; where multiple properties are bought from the same seller in similar timescales, the linked transactions analysis should be documented and professionally reviewed

Frequently asked questions