Most landlords approach incorporation as a tax decision and treat the lending as an afterthought. It is the other way round. The tax analysis tells you whether incorporation is worth doing; the lending decides whether it can be done at all, and on what terms.
Your company cannot inherit your mortgages. Every personally held buy-to-let has to be redeemed and replaced with a company facility. That is a full application per property, with a valuation, an underwrite and a legal process on each one.
Set the company up so lenders will actually lend to it
Lenders draw a hard line between a special purpose vehicle and a trading company. An SPV that does nothing but hold property attracts the widest panel and the sharpest rates. A company that also runs a building firm, a shop or consultancy work is a trading company, and most buy-to-let lenders will simply decline it.
Practical points at incorporation:
- Use property SIC codes only — 68100, 68209, 68320. A mixed or wrong code causes declines that are tedious to unpick afterwards.
- Keep the shareholder and director structure simple. Every director and every shareholder above roughly 20–25% will be credit-searched and will usually need to give a personal guarantee.
- Corporate shareholders, trusts and non-UK-resident directors narrow the panel sharply. Declare them at the outset rather than at offer stage.
- Open the company bank account early. Underwriters ask for statements, and a company with no banking history and no trading record is assessed almost entirely on the directors.
The number that decides everything: interest cover
Company buy-to-let is underwritten on interest cover ratio, not on your income. The rental figure the valuer puts on the property is divided by the stressed mortgage payment, and the result has to clear the lender’s threshold.
Typical shape in 2026: an interest cover requirement around 125% for a limited company, stressed at roughly 5.5% — or, on a five-year fixed rate, at the product pay rate rather than a notional stress. That single difference is why so many incorporations are financed on five-year fixes: the stress is lower, so the loan is bigger.
Work the ICR on every property before you commit to anything. A portfolio that comfortably supports personal lending can fail company stress tests on the weaker properties, and you only discover it once the valuations land.
Portfolio landlord rules apply from four properties
If you have four or more mortgaged buy-to-lets, you are a portfolio landlord under the PRA’s standards. Expect to provide a full asset and liability statement, a property schedule showing every holding with its value, loan and rent, cash-flow projections and a business plan. Lenders also assess your portfolio’s aggregate loan-to-value and aggregate ICR, not just the property in front of them — so one heavily geared property can affect an application on a different one.
Have that pack ready before you apply. Assembling it mid-application is the single commonest cause of delay.
Sequencing, and the cash you need on day one
Incorporation needs real money at completion, not later:
- SDLT on the market value of every property, charged at the higher rates, payable within 14 days.
- Early repayment charges on any personal mortgage still in a fixed period.
- Arrangement fees, valuation fees and legal costs on both the redemption and the new company facility.
- Company legal fees, and often a requirement for the directors to take independent legal advice on the personal guarantees.
Doing the portfolio in tranches rather than all at once spreads that cost, lets you time redemptions to the end of fixed-rate periods, and gives the company a short lending track record before the harder cases go in.
What gets declined
The recurring reasons are unglamorous: a trading SIC code, a director with recent adverse credit, a property whose rent will not stress, a non-standard construction type the lender’s panel will not touch, a company with corporate shareholders and no explanation, and — frequently — a case presented as a straightforward purchase when it is a connected-party transfer. Say what it is up front. Underwriters who discover it themselves take a dim view.
Realistic timeline
Allow two to four weeks from application to offer per property in a clean case, longer where a portfolio review is required, and then the legal process on top. A six-property incorporation handled properly is a three-to-four-month project, not a fortnight.
Before you start
Get the tax advice first, model the interest cover second, and only then look at the property values. If the tax saving depends on borrowing the company cannot actually raise, the plan does not work — and it is far cheaper to find that out on a spreadsheet than after you have paid the stamp duty.
Talk to us before you incorporate, not after. We will tell you what the portfolio will actually raise.
Related services
Most buy-to-let mortgages, and some forms of commercial, bridging and development finance, are not regulated by the Financial Conduct Authority. Your property may be repossessed if you do not keep up repayments on a loan secured against it. Giles Finance is authorised by the Financial Conduct Authority (No. 726857) to transact regulated mortgages. Giles Finance is a trading style of Giles Finance & Consultancy Services. This article is general information, not advice.