Landlord Portfolio Incorporation UK: Why and When to Phase It

The question landlords with an established portfolio usually ask is not whether to incorporate. It is whether to do it in one movement or over several years. That is a strategy question, and it has a different answer for a geared five property portfolio with large gains than it does for a lightly geared pair of flats bought recently.

Phasing gets recommended almost by reflex, usually on the strength of the capital gains argument alone. That argument is real but smaller than it sounds, and it sits alongside a stamp duty argument that frequently points the other way. What follows works through both, with the multi-year arithmetic on 2026/27 rates, then covers the part nobody plans for: running two structures side by side for years, and getting out again. The mechanical sequence of transferring a portfolio is set out separately in our step-by-step portfolio incorporation guide.

Should I incorporate my portfolio all at once?

The short answer for most landlords is no, not on one day, but the reason matters more than the answer. Incorporating everything at once concentrates three separate events into a single window:

• A capital gains disposal on every property, deemed to happen at market value because you and your company are connected persons, with the tax due within 60 days of completion where tax arises.
• A chargeable stamp duty transaction on every property, again at market value under section 53 of the Finance Act 2003, with the 5% additional dwellings surcharge on top.
• A complete refinance of the portfolio, because personal buy-to-let mortgages do not move across to a company.

Doing all three simultaneously is a large cash event and a large execution risk. Spreading them is what phasing is for.

The counterweight is that one specific relief pushes hard in the opposite direction. Section 162 TCGA 1992 incorporation relief requires the whole business to be transferred as a going concern. If that relief is what makes your numbers work, phasing the disposals is the one thing that can destroy it. So the first decision is not the pace. It is which route you are on.

Incorporating a property portfolio into a business: the test that decides everything

Everything downstream turns on whether your lettings amount to a business rather than passive investment. HMRC looks for genuinely active management: the number of properties, the hours actually spent, whether the work is done rather than handed wholesale to an agent. Ramsay v HMRC [2013] UKUT 226 (TCC) is the leading authority, and a portfolio under real active management qualified there.

If the answer is yes, Section 162 relief is potentially available and the sensible plan is usually one clean whole-business transfer, with the surrounding work phased around it. Note that for transfers on or after 6 April 2026 the relief must be positively claimed under section 162 TCGA 1992 as amended by Finance Act 2026, by the first anniversary of the 31 January following the tax year of transfer. A 2026/27 transfer must be claimed by 31 January 2029. The old section 162A election to disapply the relief has been repealed, so the position is now claim or no relief.

If the answer is no, the relief is off the table, every transfer is simply a connected-party disposal at market value, and phasing across tax years becomes the main lever you have. We cover the statutory test in depth on our Section 162 incorporation relief guide, and the practical outcome on incorporating rental property without a CGT charge.

Phased incorporation of a rental portfolio: the trade-offs side by side

Factor	Single bulk transfer	Phased over 2 to 4 years
Annual exempt amounts used	One (£3,000 per owner)	One per tax year used
Basic rate band at 18%	One year's headroom only	Fresh headroom each year
Section 162 relief	Available if the business test is met	Usually forfeited by piecemeal transfers
Six dwellings rule (s.116(7) FA 2003)	Available if 6 or more move in one transaction	Forfeited once the portfolio is split
Total SDLT	Same or lower	Same or higher
Legal and valuation fees	One coordinated exercise	Repeated each phase
Refinancing	Whole portfolio at once, ERCs likely	Timed to product expiry, ERCs avoidable
Cash flow	One large outflow	Spread across years
Ability to change your mind	None after completion	Retained until the last phase

Read down that table and the pattern is clear. Phasing wins on capital gains tax, cash flow and optionality. Bulk transfer wins on stamp duty, professional fees and relief availability. Which set of columns matters more depends entirely on the size of your gains relative to the size of your stamp duty bill.

Worked example: spreading gains across three tax years

Take a higher-rate landlord with employment income of £70,000 and a geared five-property portfolio held in their sole name, none of it ever a main residence. Gains, after allowable acquisition and improvement costs, are £22,000, £35,000, £48,000, £60,000 and £85,000. Total gains £250,000. The lettings are agent-managed and would not pass the business test, so Section 162 relief is not in play.

Residential capital gains rates for 2026/27 are 18% within the basic-rate band and 24% above it. The annual exempt amount is £3,000. With £70,000 of income there is no basic rate headroom, so every pound of gain falls at 24%.

Option A: everything in 2026/27

Gains £250,000, less one annual exempt amount of £3,000, leaves £247,000 taxable at 24%. Capital gains tax is £59,280, payable within 60 days of the completions.

Option B: three tax years

Tax year	Properties	Gains	Less AEA	CGT at 24%
2026/27	1 and 2	£57,000	£54,000	£12,960
2027/28	3 and 4	£108,000	£105,000	£25,200
2028/29	5	£85,000	£82,000	£19,680
Total		£250,000	£241,000	£57,840

The saving is £1,440. That is exactly two extra annual exempt amounts at 24%, and nothing more. It is a real saving, but on a £250,000 gain it is under 2.5% of the bill. Anyone promising that phasing transforms a capital gains position on these facts is overselling it.

What actually moves the number

Two variations change the picture materially.

Unused basic-rate band. Suppose the same portfolio belongs to a landlord whose taxable income is £30,000 rather than £70,000. After the personal allowance, there is roughly £20,270 of basic-rate band spare each year, so that slice of gain is taxed at 18% instead of 24%, saving 6%, or about £1,216 per year. Across three tax years that is two additional slices, worth roughly £2,432, on top of the £1,440 of extra exempt amounts. Total saving close to £3,900. Note that a large gain in any one year eats the band itself, which is precisely why concentrating them wastes it.

Joint ownership. A jointly owned portfolio gives each owner an annual exempt amount and each owner their own basic-rate band. Both figures above double. Two extra tax years for a couple is £12,000 of extra exemption, worth £2,880 at 24%, before any band effect.

The figures here are illustrative and rounded to show the mechanism. They are not a quotation, and they ignore the stamp duty side entirely, which is where the analysis usually turns.

Portfolio incorporation cost UK: where phasing costs you money

Phasing is often described as the cheaper route. On the whole cost stack, it frequently is not.

Stamp duty is unchanged by phasing, and can be made worse by it. Every transfer to your connected company is charged on market value with the 5% additional dwellings surcharge on top, regardless of timing. Worse, section 116(7) FA 2003 automatically treats six or more dwellings transferred in a single transaction as non-residential, giving 0% up to £150,000, 2% to £250,000 and 5% above, with no surcharge at all. That is a statutory deeming, not an election. Split the portfolio into annual tranches of two or three and you lose it. For a landlord with six or more properties this single point usually outweighs every capital gains argument for phasing. The full mechanics, including the genuine partnership route under Schedule 15 FA 2003, sit on our SDLT on incorporation guide and the Schedule 15 sum of the lower proportions analysis. For the charge on a single property transfer, see the SDLT cost of transferring property to a company. Multiple Dwellings Relief is gone, abolished for transactions on or after 1 June 2024, so any guidance suggesting it softens a portfolio transfer is out of date.

Professional costs repeat. Conveyancing, valuations, lender legal fees and accountancy are largely per transaction. Five separate phases means five rounds of them, not one discounted bundle.

Company running costs start at phase one and never stop. Incorporation at Companies House is £100 online, or £124 on paper, and the confirmation statement is £50 a year online. Those are small, but statutory accounts, a corporation tax return and bookkeeping run from the moment the first property lands, even if the company only holds one asset for three years. Our SPV formation cost breakdown sets out the full running cost picture.

So the cheapest way to incorporate a portfolio is usually not the slowest. It is the one that preserves whichever stamp duty route is open to you, then spreads the capital gains only to the extent it does not disturb that.

Can I incorporate some properties and not others?

Yes, provided Section 162 relief is not the point of the exercise. Nothing requires a complete portfolio move, and a deliberate partial incorporation is often the right long-term answer rather than an unfinished one. Properties that commonly stay in personal ownership include:

• A property you expect to occupy yourself later, where private residence relief would be lost inside a company.
• A low-gain or recently purchased property, where stamp duty on the transfer swamps any income tax benefit.
• A property that will not refinance on limited company terms, whether because of construction type, tenancy type or lending appetite.
• Anything held jointly with someone who does not want to be a shareholder.

The single caution is that a partial transfer is fundamentally incompatible with Section 162, because the relief is all-or-nothing on the business as a going concern. If you want relief on the bulk and to retain one property, that property generally has to be outside the letting business before the transfer, not carved out at the point of transfer.

Running a mixed personal and company structure long term

Whether by design or as a transition state, most phasing landlords run both structures for years. The realistic picture over a five year window looks like this.

Year	Personal side	Company side
1	4 properties, Section 24 restriction, self-assessment, MTD in scope	Company formed, 1 property, first short accounting period
2	4 properties, unchanged	1 property, first full accounts, no distributable profit yet
3	2 properties, personal qualifying income falling	3 properties, interest fully deductible, retained profit building
4	1 property retained permanently	4 properties, first dividends considered
5	1 property, simple return	4 properties, extraction policy settled

Two regimes, two sets of records

The personally held properties file through self-assessment with the Section 24 restriction applying in full. The company files statutory accounts and a corporation tax return, deducting mortgage interest in full before tax. Corporation tax runs at 19% on profits up to £50,000, 25% above £250,000, with marginal relief producing an effective 26.5% on profits in between, which is where a mid-sized portfolio company usually sits.

Making Tax Digital moves as the portfolio moves

While properties remain personal, their rental income counts towards your Making Tax Digital for Income Tax qualifying income: 6 April 2026 for combined qualifying income above £50,000, 6 April 2027 above £30,000, and 6 April 2028 above £20,000. Companies are not within MTD for Income Tax at all, so each phase moves income out of the personal test. A landlord phasing through 2027 and 2028 can find themselves crossing a threshold in one direction while their transfers move them back the other way. Our explainer on the MTD qualifying income test covers how the measure works.

Money in the company is not money in your hand

This is the point most transition plans underweight. Rental profit taxed at 19% or 25% inside the company still has to come out. Dividends for 2026/27 are taxed at 10.75% basic, 35.75% higher and 39.35% additional, after a £500 dividend allowance. Where a Section 162 incorporation created a credit balance on the director's loan account, repayments of that balance come out without further tax until it is exhausted, which is a valuable but strictly finite resource. A mixed structure where the company retains profit and the personal side funds your living costs is often more tax efficient than drawing from both, and that only works if the personal properties are the ones producing spendable income.

Incorporating a property portfolio UK: the income tax picture in transition

For properties still held personally, Section 24 applies in full: finance costs are not deducted from profit, and a basic-rate tax credit is given instead, at 20% for 2026/27. From 6 April 2027, Finance Act 2026 introduces separate property income rates of 22% basic, 42% higher and 47% additional for England, Wales and Northern Ireland, and gives the Section 24 reducer at the new 22% property basic rate rather than freezing it at 20%.

The practical consequence is worth stating precisely, because it is widely misreported. A basic-rate landlord sees the reducer track their rate, so no new wedge opens. A higher or additional-rate landlord sees the reducer improve from 20% to 22%, but the gap to their 42% or 47% rate is unchanged from the current 20 and 25 point gaps. The finance cost restriction does not get worse in 2027/28, but it does not go away either, and that gap is the whole reason geared landlords look at companies. Our guide to the 2027 property income tax rates sets out the detail.

Refinancing: the constraint that sets the pace

Tax decides whether to incorporate. Finance decides the pace, and it is the constraint that most often overrules the tax year. Personal buy-to-let mortgages cannot be assigned to a company, so each phase means redeeming and re-lending on limited company terms. Three facts set the rhythm: early repayment charges make redeeming a fixed rate ahead of its end date a direct cash cost; company lending criteria differ, so not every property will refinance on the same terms; and director guarantees are near universal, so incorporation does not remove your personal exposure to the debt. The lending mechanics are covered in the step-by-step incorporation guide.

The consequence for a phased plan is that transfers cluster around product expiry dates rather than 5 April. Where the two conflict, mortgage timing normally wins: an early repayment charge is a certain four-figure cost, while an extra annual exempt amount is worth £720. That is also why a phased plan should be mapped against the portfolio's expiry calendar before any tax modelling, not after. The timing of incorporation is covered separately.

Planning the eventual exit before you incorporate

The most expensive error in this area is reversible only at full cost. Property inside a company leaves it by one of three routes, and the structure you build should suit the one you expect.

• Asset sale. The company sells the property. Corporation tax on the gain inside the company, then a further layer of tax to get the proceeds to you personally as dividends or a liquidation distribution.
• Share sale. You sell the company. No stamp duty land tax on the land for the buyer, stamp duty on shares at 0.5%, and a capital gains disposal of your shares. Buyers discount for latent gains inside the company, so the headline is rarely the net.
• Succession. Shares pass to the next generation. This is where company ownership genuinely outperforms personal ownership, because shares can be transferred in tranches and different classes can be created, which bricks and mortar cannot.

Then there is the route to avoid: transferring in, paying the 5% surcharge, and later pulling a property back into personal ownership. That is a second chargeable transaction plus a taxable distribution on the way out. If there is any real prospect of wanting a property back personally, do not put it in. Where the plan ends in winding the company up, our guide on how to close a property limited company covers the routes and the £25,000 distribution threshold that decides whether a final distribution is capital or income.

Related reading

• Incorporating a Property Portfolio UK: The Step by Step Process
• SDLT on Incorporation: Paying Stamp Duty Twice
• Incorporating Rental Property Without a CGT Charge
• Section 162 Incorporation Relief for Property Landlords
• How to Transfer Property Into a Limited Company
• SPV Company Formation Cost UK

External references: Capital Gains Tax rates (gov.uk), SDLT residential property rates (gov.uk), Companies House fees (gov.uk), and HMRC Capital Gains Manual CG65700 on incorporation relief.