The question “should I incorporate my property portfolio?” is one of the most common we receive. For many higher-rate landlords facing the full impact of Section 24, incorporation can save thousands of pounds a year in income tax. But the upfront costs — SDLT and potentially CGT on transfer — mean it isn’t automatically the right answer for everyone.
👉 Free download: For the full 62-page guide on this topic — Section 24, FHL, MTD ITSA, CGT, SDLT, incorporation, IHT and HMRC enquiry triggers — get our 2026/27 UK Landlord Tax Playbook (free PDF, no follow-up calls).
Incorporating a buy-to-let portfolio can save higher-rate landlords thousands annually — but transfer triggers SDLT (typically 3-17%) and a CGT event on the deemed disposal. Section 162 incorporation relief defers the CGT if the business is genuine, and SDLT relief may apply for genuine partnership transfers. Most portfolios over 4-5 properties benefit; smaller portfolios usually don’t.
This 2026 guide sets out the full analysis: the tax savings, the transfer costs, when it makes sense, and how to structure it correctly.
📋 Why Landlords Are Incorporating
- Section 24: Limited companies can still deduct full mortgage interest as a business expense — individual landlords cannot
- Corporation tax rates: 19–25% on profits vs 40–45% income tax for higher-rate landlords
- Profit retention: profits retained in the company are only taxed at the corporate rate until extracted — useful for reinvestment or portfolio growth
- IHT planning: company shares can be more flexible for succession planning than direct property ownership
The Tax Savings — How Much Could You Save?
| Scenario | Individual (Higher Rate) | Limited Company |
|---|---|---|
| Rental income | £40,000 | £40,000 |
| Less: mortgage interest | Not deductible (Section 24) | £20,000 |
| Less: other expenses | £5,000 | £5,000 |
| Taxable profit | £35,000 | £15,000 |
| Tax rate | 40% | 19% |
| Tax on profit | £14,000 | £2,850 |
| Less: 20% interest credit | £4,000 | N/A |
| Net tax | £10,000 | £2,850 |
In this example the company saves £7,150 per year in tax on the same portfolio. The savings compound over time and are even larger for additional rate taxpayers or those with higher mortgage balances.
The Transfer Costs — SDLT and CGT
⚠️ The Big Catch — Transfer Triggers Tax
Transferring property from personal ownership to a limited company is treated as a sale at market value for both SDLT and CGT purposes — even if no cash changes hands. These upfront costs can be substantial and must be weighed against the ongoing annual savings.
📋 SDLT on Incorporation
When properties transfer to a company, SDLT is charged at the additional dwelling surcharge rates (standard rates + 5%) on the market value of each property. For a portfolio of properties worth £1.2 million, the SDLT bill could easily exceed £60,000–£80,000.
Partnership relief: If the properties are genuinely held in partnership (with a formal partnership agreement, joint mortgages and shared income), and the company is owned in the same proportions as the partnership, SDLT relief may be available to significantly reduce the charge. This is a complex area — specialist advice is essential before any transfer.
📋 CGT on Incorporation
The transfer is also a disposal for CGT purposes at market value. Any gain above the original purchase price (plus costs and improvements) is subject to CGT at 18% or 24%. For properties held for many years with significant appreciation, this can be a very large CGT bill.
Incorporation Relief: If the transfer is of a genuine property business (not just a passive portfolio), the CGT gain can be rolled into the share value under Incorporation Relief — deferring rather than eliminating the CGT. HMRC requires evidence of a genuine business: active management, multiple properties, significant time commitment. Not every landlord will qualify.
The Break-Even Analysis
The key question is: how many years of annual tax savings does it take to recover the upfront transfer costs?
📊 Example Break-Even
- Annual tax saving in company: £7,150
- SDLT on transfer: £65,000
- CGT on transfer: £20,000
- Total upfront cost: £85,000
- Break-even: 85,000 ÷ 7,150 = approximately 12 years
In this scenario, incorporation only makes financial sense if the landlord plans to hold the portfolio for 12+ years. For landlords planning to sell within 5–7 years, the costs outweigh the savings. This is why bespoke modelling for each client is essential.
Worth Incorporating? Let’s Run the Numbers
Free portfolio incorporation analysis — including SDLT, CGT and Section 162 relief modelling.
Who Should and Shouldn’t Incorporate
✅ Incorporation Makes Sense When:
- You are a higher or additional rate taxpayer with significant mortgage interest costs
- You plan to hold and grow the portfolio for 10+ years
- You want to retain profits in the company for reinvestment rather than extracting everything
- The properties have relatively modest capital gains (limiting the CGT on transfer)
- You qualify for partnership relief (genuine partnership structure in place)
❌ Incorporation May Not Make Sense When:
- You plan to sell properties within the next 5–7 years
- Properties have large unrealised capital gains — CGT on transfer is punishing
- You are a basic rate taxpayer — Section 24 doesn’t cost you anything
- You have small mortgage balances — the Section 24 restriction is minimal
- You need to extract most profits immediately — double taxation (CT + dividend tax) erodes the saving
The Alternative — Buy New Properties Through a Company
For many landlords, the most practical approach is to leave existing properties in personal names and buy all future properties through a limited company. This avoids the transfer costs entirely while capturing the benefits for new acquisitions. Over time, as the personal portfolio is sold down, the company portfolio grows.
SDLT Partnership Relief: The Key to Affordable Incorporation
For most portfolio landlords, SDLT is the single biggest barrier to incorporation. On a £2 million portfolio, standard SDLT on transfer to a company would run to roughly £200,000 — completely uneconomic for most landlords. SDLT partnership relief under FA 2003 Sch 15 para 10 can reduce this charge to near zero, but only if specific conditions are met.
The relief works by treating the transfer to a company as a transfer between the partners (who collectively own the partnership and the company that succeeds it) rather than a true third-party transfer. The key requirements:
- A genuine business partnership must exist — not just joint ownership of properties. Properties held as tenants in common with separate Self Assessment returns do not qualify; a proper partnership with a written agreement, partnership tax return (SA800), HMRC registration as a partnership, and joint business activity does qualify.
- The partnership must have existed for at least 12 months before incorporation. Retrospective paper partnerships set up the week before incorporation are routinely challenged by HMRC and the relief is denied.
- The shareholdings in the new company must mirror the partnership interests. A 50/50 husband-and-wife partnership must result in a 50/50 shareholding (typically by class — A and B shares allow income flexibility while preserving relief).
- The transfer must be of the trading partnership business as a going concern, not a piecemeal asset transfer.
For solo landlords (no partnership), partnership relief is not available. The route forward is either to accept the SDLT cost as a one-off (sometimes economic over a 10-year horizon for very large portfolios), to bring in a partner and wait 12 months, or to follow the alternative strategy of leaving existing properties personal and buying new ones through the company.
Incorporation Relief (TCGA s162): The CGT Side of the Coin
Where SDLT partnership relief solves the stamp duty problem, incorporation relief under TCGA s162 solves the capital gains tax problem. Section 162 allows the chargeable gain on the transferred properties to be rolled into the base cost of the shares the landlord receives in the new company. No CGT is paid at incorporation — but it does eventually crystallise when the shares are sold.
Key conditions for s162 relief:
- The transfer must be of an unincorporated business, not a passive investment. HMRC’s position on property lettings has hardened — the well-known Ramsay v HMRC case (2013) confirmed that a portfolio needs to demonstrate “business” levels of activity (multiple properties, active management, sufficient hours, organisational structure) to qualify.
- All assets of the business must be transferred (with the exception of cash).
- Consideration must be wholly or partly in shares of the new company. Any cash consideration triggers a partial CGT charge.
For active portfolio landlords with 4+ properties, regular management activity, and the time commitment of a business, s162 relief is typically available. For passive owners of one or two properties managed by an agent, it is not. The “Ramsay test” — was the landlord running a business or just holding investments? — is HMRC’s most common challenge in this area.
Common Incorporation Mistakes That Cost Landlords Money
1. Setting up a “paper partnership” too late
Establishing a partnership 6 weeks before incorporation in an attempt to claim SDLT partnership relief is a textbook HMRC red flag. HMRC will challenge the relief on the basis that the partnership was not genuine, not active, and not pre-existing. Result: full SDLT charge plus penalties. Partnerships need to be real and at least 12 months old at the point of transfer.
2. Failing the “business” test for s162 relief
Landlords with one or two properties managed by an agent typically don’t pass the Ramsay business test. The CGT cost on transfer then becomes a real cash cost, not just a deferral. Before assuming s162 relief is available, run the activity-and-hours test honestly — and document the work being done (correspondence, time logs, attendance at properties, evidence of management decisions).
3. Forgetting the mortgage refinance cost
Transferring mortgaged properties to a company isn’t a paper transaction — the existing personal mortgages need to be redeemed and replaced with limited-company mortgages (rates typically 0.5–1.0% higher, plus arrangement fees of £1,500–£3,500 per property). The financing cost over 5 years can easily reach £30,000–£50,000 on a 10-property portfolio. Factor this into the break-even analysis.
4. Underestimating the ongoing compliance burden
A company brings annual statutory accounts, an annual corporation tax return, a confirmation statement, PSC register updates, and the discipline of separating personal and business finances. Professional fees rise from typically £500–£900 (sole-trader landlord) to £1,500–£3,000 per year (incorporated portfolio). Over 10 years, that’s £6,000–£20,000 of extra compliance cost. It is recoverable from the tax savings for portfolios above a certain size, but not all portfolios.
5. Triggering ATED on company-held dwellings
Properties held by a company with a value above £500,000 are subject to the Annual Tax on Enveloped Dwellings (ATED) unless an exemption applies. The “let to third parties on commercial terms” exemption removes the charge for genuine BTL landlords — but the relief is by election only, and the form must be filed by 30 April each year. Forgetting to file the relief return triggers full ATED at £4,400–£292,350 per property per year depending on band. Many newly-incorporated portfolios get caught by this in year one.
6. Ignoring the dividend-extraction friction
Profits inside a company are taxed at corporation tax (25% for most portfolios above £250k profit, 19% small profits rate, 26.5% in the marginal band). Extracting them as dividends triggers a second layer of tax at the shareholder’s dividend rate (8.75% / 33.75% / 39.35%). For a landlord who plans to spend all rental profits as personal income each year, the combined effective rate is often higher than personal income tax would have been. The company structure works best when profits are retained for reinvestment.
Frequently Asked Questions
Can I incorporate just some of my properties?
Yes, technically — but it usually fails the s162 incorporation relief test, which requires the whole business to be transferred. Cherry-picking properties (transferring the most profitable, retaining the rest personally) typically loses the CGT shelter. The alternative is to incorporate the entire portfolio and then sell unwanted properties out of the company over time. Or, more commonly, leave the entire existing portfolio personal and use the company for future acquisitions only.
What if my partnership accounts are missing or sloppy?
HMRC will look at the substance, not just the paperwork. A partnership with a single bank account, no partnership tax return, and no written agreement will struggle to evidence its existence even if the parties have been splitting rental profits 50/50 for years. Before any incorporation involving partnership relief, the partnership should be in a credible state — proper SA800 returns for at least 2 prior tax years, partnership accounts, an agreement, and HMRC partnership UTR all in place.
How long does the incorporation process take?
Realistically, 4–6 months end-to-end for a portfolio of 5–15 properties. Stages typically include: feasibility modelling (2-4 weeks); partnership formalisation if not already in place (6-12 months — the 12-month clock starts here); legal work on title transfers (2-3 months); mortgage refinancing (2-3 months in parallel); the actual transfer date; and post-transfer compliance set-up (1-2 months). Rushing the process is the most common source of errors.
What about CGT on the eventual sale of shares?
Where s162 incorporation relief has rolled the property gain into the share base cost, the shares carry a low base cost equal to the original property cost. On eventual sale of the shares, the gain is the difference between sale price and the original property cost — meaning the gain that was deferred at incorporation crystallises at the point of share sale. The CGT rate on share sales is 18%/24% (2026/27 residential rates effectively apply to property-rich companies through the s236H test), or 14% under BADR for qualifying business asset disposals — though BADR availability for property letting companies is restrictive.
Can my children own shares in the property company?
Yes. Many incorporations set up a family share structure — typically A shares for the founder couple (carrying voting and control rights) and B shares for adult children (typically non-voting, dividend-receiving). This is an effective long-term inheritance planning strategy as future capital growth accrues to the children’s shares from day one. Get the share structure right at incorporation; restructuring later triggers tax events.
What about Welsh and Scottish property?
Land Transaction Tax (LTT) in Wales and Land and Buildings Transaction Tax (LBTT) in Scotland apply on transfers to a company instead of SDLT. Both jurisdictions have their own partnership relief regimes broadly mirroring the SDLT rules, but the detail differs. For mixed UK portfolios spanning multiple jurisdictions, plan each leg separately.
✅ Key Takeaways — Portfolio Incorporation 2026
- Incorporation can save thousands per year for higher-rate landlords with significant mortgage interest
- But transfer triggers SDLT at surcharge rates and CGT at market value — upfront costs can be very large
- The break-even analysis is critical — typical payback periods are 8–15 years depending on the portfolio
- Partnership relief (SDLT) and Incorporation Relief (CGT) are available in specific circumstances — both require specialist structuring
- For many landlords, buying new properties through a company while retaining existing in personal names is the most practical path
- Never transfer without detailed modelling — use our Should I Incorporate calculator as a starting point then book a discovery call
📚 Related reading
- Buy-to-Let: Personal vs Limited Company — The structure decision in full — when each makes sense for new and existing landlords.
CTA-qualified property tax specialist advising on portfolio structuring, incorporation decisions, SDLT, CGT and Section 24. Full biography →
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This article is part of our wider UK Property Tax specialism — covering Section 24 modelling, BTL incorporation analysis, SDLT, ATED, CGT 60-day reporting and property partnerships. Every engagement is led by a Chartered Tax Adviser.
👉 Holding property in a company? Residential property over £500,000 in a corporate structure brings an annual ATED charge — and a return is due even when relief means no tax is payable. See: ATED Explained 2026/27.