The genuinely hard question is not whether to incorporate but when. Pick the moment badly and it costs real money, because incorporation fires a capital gains charge, a 5% stamp duty bill on market value, and a refinancing exercise all at once. The whether question turns on broad principles (higher-rate exposure, gearing, plans to retain profits), and if you have not settled that yet, start with whether you should incorporate a buy-to-let portfolio. Here, assume you have broadly decided in favour and now have to choose the moment.
The right time is rarely a single income figure. It is the point where five triggers line up: the level of your rental profit, the point you pick in the tax year, whether you are about to expand, where property values sit in the cycle, and life events that move your personal tax rate. Each is set out below against the current 2026/27 rules, including the new section 162 claim requirement that catches a lot of landlords out.
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Two related questions to settle first
Two questions sit alongside timing, and getting them out of the way keeps the timing decision clean.
- Whether to incorporate at all. If you have not yet decided that a company is the right structure, start with should I incorporate my buy-to-let portfolio, which sets out the yes-or-no case if you are higher-rate, geared and growth-minded.
- How to phase the transfers. Whether you move every property across in one transaction or stage it over several tax years is covered in incorporating an existing portfolio with a phased approach.
With those settled, the real question is timing: given that incorporation suits you, when should you actually pull the trigger.
Trigger 1: At what income or profit level?
The income trigger is the one most people lead with, and it exists because of Section 24. As an individual you no longer deduct mortgage interest from rental income; instead you get a basic-rate (20%) tax reducer on your finance costs. If you are a higher-rate taxpayer, that converts a chunk of what used to be relieved at 40% into relief at 20%, so the effective tax on a geared portfolio climbs well above the headline rate. A company sits outside Section 24 entirely and deducts its mortgage interest in full, which is why the case strengthens as both profit and gearing rise. For the full economic comparison, see Section 24 versus incorporation. What matters for timing is where on the income scale the signal flips from "wait" to "move".
Treat the bands below as signals, not statutory thresholds. They assume your other income has already used up your personal allowance and basic-rate band, which is the usual position for a working landlord.
| Annual rental profit band | Typical personal tax exposure | Incorporation timing signal | Key caveat |
|---|---|---|---|
| Below £30,000 | Often basic rate; Section 24 bite limited | Usually wait | Compliance overhead tends to outweigh the saving |
| £30,000 to £50,000 | Approaching or at the higher-rate threshold | Run the numbers; genuine tipping point | Depends heavily on gearing and other income |
| £50,000 to £60,000 | Higher rate; Section 24 wedge material | Often favourable | Model the five-year cumulative position, not one year |
| Above £60,000 | Higher or additional rate; full wedge | Usually favourable | CGT on incorporation and 5% SDLT must still clear |
| Any band, rapid expansion planned | Forward-looking | Consider incorporating before expanding | Avoids a second deemed disposal and a second 5% SDLT charge |
To make the wedge concrete, picture four buy-to-lets producing about £60,000 of rental profit and roughly £30,000 of annual mortgage interest. Under Section 24 the relief on that interest is capped at 20%, so you get around £6,000 of relief where full deduction at your marginal rate would have been worth about £12,000. That gap, several thousand pounds a year and rising with the loan balance, is the recurring saving a company would capture, and it is what you weigh against the one-off costs of moving.
One forward-looking factor sharpens the income trigger from 2027/28. Finance Act 2026 s.7 sets separate property income tax rates of 22%, 42% and 47% from that year (these apply to England, Wales and Northern Ireland; Scotland sets its own rates). The Section 24 reducer rises in step from 20% to 22% under Finance Act 2026 Sch 1, so no new basic-rate wedge opens and the relief keeps pace. The practical effect is modest: a personally held geared portfolio pays a little more from 2027/28 while a company is unaffected, which nudges a borderline decision towards sooner. The detail sits in the 2027 property income tax rates for landlords. If your own income is the deciding factor, compare the two structures side by side in our limited company versus personal ownership comparison.
If you have decided incorporation is right in principle and your profits sit in the upper bands, the next question is not whether but precisely when in the year to do it.
Trigger 2: Which point in the tax year to transfer?
This is where careful timing earns its keep. The transfer date splits your tax year into a final personal property-business period and a first company period, and it fixes which tax year the capital gain falls into. Get the date right and the accounting is clean and the annual exempt amount works in your favour; get it wrong and you create apportionment work and waste reliefs.
| Transfer timing | Effect on the final personal period | CGT and annual exempt amount effect | Practical note |
|---|---|---|---|
| Early in the year (April to May) | Short personal period; company runs most of the year | Gain falls in the new tax year; full £3,000 annual exempt amount available | Cleanest split; favoured by most advisers |
| Mid-year | Apportioned between personal and company periods | Gain in the current year; annual exempt amount shared with other disposals | More apportionment work |
| Late in the year (February to March) | Long personal period | Gain crowds the current-year annual exempt amount if you have other disposals | May suit deferring the company's first period |
| Across two tax years (phased) | Multiple short periods | One £3,000 annual exempt amount used per tax year across staged transfers | See the phased-approach guide for the mechanics |
There is also a reporting clock to plan around. A disposal of UK residential property that produces a CGT liability must be reported and the tax paid within 60 days of completion. On incorporation that clock starts on the transfer date, so an early-in-year transfer gives you a clean run at the deadline rather than colliding it with the January Self Assessment season. If you claim s.162 incorporation relief and the gain is fully deferred there may be no payment due, but the timing discipline still matters.
Where you are moving several properties, choosing between a single transfer date and staging the transfers across tax years (to use more than one annual exempt amount) is itself a timing decision, with its own mechanics in the phased-approach guide. If you are doing it in one go, early in the tax year is the sensible default.
Trigger 3: Before or after expansion?
If a buying programme is on the horizon, sequencing it relative to incorporation is one of the highest-value timing calls you can make. The principle is simple: every residential property you move into a company is a deemed disposal for CGT and a 5% additional-dwellings SDLT charge on its market value. Properties you buy after the company exists are acquired by the company directly, so they never have to be transferred and never attract that second round of charges.
So if you are planning to take a portfolio from four properties to ten over two or three years, you are usually better incorporating first and buying the remaining six through the company. Incorporating after the expansion means moving ten properties across instead of four, multiplying both the deemed disposal and the SDLT bill on the extra value. A company also tends to find commercial buy-to-let lending more straightforward for growth, and the retained-profit position lets you reinvest at the corporation tax rate rather than your personal rate.
On the SDLT itself, be precise about the figure. The additional-dwellings surcharge is 5% (England and Northern Ireland) on top of the standard residential rates, not the old 3%, and because you are transferring to a connected company the charge is on market value under FA 2003 s.53, not on any nominal consideration. There is one narrow exception worth knowing rather than relying on: where the portfolio is already held in a genuine, pre-existing letting partnership, the partnership relief in FA 2003 Sch 15 can reduce the chargeable consideration through the sum-of-lower-proportions mechanism. It is heavily scrutinised by HMRC, it does not rescue an ordinary joint-ownership portfolio, and it is not a quick fix. For the staging mechanics of a multi-property transfer, the phased-approach guide is the place to go.
Trigger 4: The CGT window and market-cycle timing
Incorporation is a deemed disposal at market value, so where property values sit drives the size of the gain. For 2026/27 the CGT rates on UK residential property are 18% within any unused basic-rate band and 24% above it, with a £3,000 annual exempt amount (TCGA 1992 ss.1H to 1I). On a portfolio that has appreciated since purchase, that gain can be large, which is exactly why this trigger interacts with the others.
The relief that makes incorporation viable for most landlords is incorporation relief under section 162 TCGA 1992. It defers the whole gain by rolling it into the base cost of the shares you receive, provided you transfer a property business (not just a bundle of assets) as a going concern. The going-concern test is real: HMRC and the tribunals look for active, systematic management of a genuine business, the principle established in the Ramsay case, rather than passive ownership of one or two lets. The mechanics, including how the rolled-over gain affects the shares, are covered in how to incorporate rental property without triggering CGT.
The critical change for timing is that s.162 relief is no longer automatic. For transfers on or after 6 April 2026 you must make a claim (new s.162(1)(b), inserted by Finance Act 2026 s.39), and the claim is due by the first anniversary of the 31 January following the tax year of the transfer. Miss the claim window and the deferral is lost, so the transfer date now carries a hard compliance deadline that did not exist before. That makes the CGT window two timing questions at once: when the valuation is favourable, and when you can be sure the claim will be made and evidenced on time.
On the market-cycle point, some landlords deliberately incorporate when values are flat or after a correction, so the gain to defer (or pay, if relief is not in point) is smaller, and align the transfer with a tax year in which their annual exempt amount is not already absorbed by other disposals. You can model the gain and any deferral with our CGT on property transfer to limited company calculator before fixing a date. Market timing should support the decision, never drive it on its own.
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Trigger 5: Life-event triggers
Because incorporation is fundamentally about the gap between your personal tax rate and the corporation tax rate, anything that moves your personal rate moves the timing. The common life events cut in both directions.
- Approaching retirement. If employment income is about to fall away and your marginal rate will drop, the personal-versus-company gap narrows. That can favour delaying, or even not incorporating, and may simplify later inheritance planning if you do not need the rental income.
- Promotion or a rising career income. Pushing further into higher-rate (or additional-rate) territory widens the gap and favours incorporating sooner, before the Section 24 wedge does more damage.
- A change in your spouse's income. Where property is jointly owned, a shift in a partner's income can change whether splitting income personally still beats a company. Transfers between spouses are themselves on a no-gain/no-loss basis (TCGA 1992 s.58), which can be a planning step in its own right before any company is involved.
- New business or investment income. Additional income that lifts your total into a higher band strengthens the case and brings the trigger point forward.
The practical discipline is to look at the next three to five years of your likely personal income, not just this year. Incorporating in the year before a known income jump captures the benefit early; incorporating just before a known income fall can lock you into company overheads you no longer need.
When the timing is wrong (the wait signals)
Several situations point clearly towards holding off, and recognising them is as valuable as spotting the green lights.
- Recent purchases. The 5% additional-dwellings SDLT charge on transfer makes recently acquired properties expensive to move; you would effectively pay the surcharge twice within a short period.
- An imminent sale. If you expect to sell a property soon, putting it through a company first rarely leaves enough runway to recover the incorporation costs.
- Profits below the compliance break-even. Below roughly £20,000 to £30,000 of rental profit, the ongoing cost and administration of a company tends to outweigh the tax saving.
- A personal rate about to fall. If you are about to drop back to basic rate, the company advantage shrinks and the case weakens.
- Lender restrictions. Some lenders limit or price up company borrowing, and a refinance that is difficult or costly right now is a reason to wait until the lending picture improves.
None of these is permanent. A wait signal is usually a "not yet", and revisiting the decision after a purchase has aged, a sale has completed, or a mortgage product has refreshed often turns a red light green.
The corporation tax position once you incorporate
Timing also interacts with the rate the company will pay, particularly if you already run one or more SPVs. A property company does not pay a single flat rate; it works through three figures.
| Augmented profits | Rate | Statute |
|---|---|---|
| Up to £50,000 | 19% small profits rate | CTA 2010 s.18A |
| £50,001 to £250,000 | Marginal relief (26.5% effective on the slice) | CTA 2010 s.18B and s.18D (fraction 3/200) |
| Above £250,000 | 25% main rate | CTA 2010 s.3 |
| Close investment-holding company (any level) | 25% throughout (denied the small profits rate) | CTA 2010 s.18A(1)(b) |
The £50,000 and £250,000 limits are divided by the number of associated companies plus one (CTA 2010 s.18E). So if you already hold, say, two existing SPVs and incorporate a third, those limits split three ways, pulling more profit into the marginal-relief band sooner. Where your structure already includes SPVs, that divisor is a genuine timing input: it can be cleaner to settle the company structure before profits rise rather than after. A normal letting company is generally not a close investment-holding company, but a company that mainly holds investments for connected persons can be caught and taxed at 25% throughout, so check the point rather than assume it.
The practical steps (in brief)
Once the timing is right, the execution follows a defined process: take detailed modelling and legal advice, form the company, transfer the properties at market value, refinance the borrowing into the company's name, report the CGT and SDLT and register for Corporation Tax, then run all income and expenses through the company from the transfer date. For the full walkthrough, see the step-by-step landlord incorporation guide; for staging multiple transfers, see the phased-approach guide.
Getting the timing analysis right
The five triggers rarely point the same way at once, and the interactions (a strong income signal offset by a recent purchase, or a CGT window that conflicts with a known income change) are where generic advice falls down. A proper analysis models your specific portfolio across different transfer dates and a five-year horizon, so you can see the cumulative effect of moving now versus in twelve months rather than a single snapshot. If you want a sense of how specialist support is structured before you commit, our note on what a property accountant does and how engagements work sets out what to expect. When you are ready to test your own timing, our team can model the trigger points against your numbers and the current rules.