Buy to Let Remortgage: Rates, Rental Cover and Releasing Equity in 2026

By Jake Stott, Knox Mortgages. Reviewed by an adviser authorised under Fort Advice Bureau, FCA FRN 972730. Published 25 September 2026. Last reviewed 25 September 2026.

A buy to let remortgage is a new mortgage on a rental property you already own, taken out to replace your existing buy to let loan, usually when a fixed rate ends. You either switch to a better rate with a different lender, release equity to fund another purchase, or change the structure of the loan. The lender assesses it mainly on the rent the property earns, not your salary.

This guide covers the parts most comparison pages skip: when a product transfer beats a full remortgage, how the interest cover calculation now caps your loan more often than the valuation does (with the arithmetic shown), what lenders will and will not let you raise equity for, why moving a property into a limited company is a sale and not a remortgage, and what changed for landlords in 2026. If you are buying rather than refinancing, start with our buy-to-let mortgage guide.

What is a buy to let remortgage and when should you do one?

A buy to let remortgage means redeeming your current rental property mortgage and replacing it with a new loan, normally from a different lender. The right time is usually 3 to 6 months before your fixed or tracker rate ends, because most lenders let you lock in an offer that far ahead and the new loan completes the day the early repayment charge falls away. Waiting until the deal has expired means at least one month on the lender’s reversion rate, which for buy to let is often above 8%.

Landlords remortgage for four reasons:

• Rate: the incentive period is ending and a new lender is cheaper than your existing lender’s retention offer.
• Equity: the property has gone up in value and you want to release cash, typically for the deposit on the next purchase.
• Structure: moving from repayment to interest only (or back), changing the term, or adding or removing a borrower.
• Lender fit: your circumstances have changed (more properties, a new tenancy type, an HMO licence) and the current lender no longer suits the case.

If none of those apply, a product transfer with your current lender is often the faster, cheaper route. The next section shows how to decide.

Should you take a product transfer or remortgage your buy to let?

Take a product transfer if you are not raising money and your existing lender’s retention rate is within about 0.2% of the best open-market rate after fees. Remortgage if you want to release equity, the rate gap is wider, or your current lender’s range is poor. A product transfer is a new rate with the same lender on the same loan; there is normally no new valuation, no solicitor and no full affordability or portfolio assessment when you are not borrowing more. That makes it the safer route for landlords whose rent no longer passes a fresh interest cover test. A remortgage re-underwrites everything, so it only works if the property still stacks up on today’s rent and today’s stress rate.

We compare both side by side on every case. The full breakdown for residential and rental loans is in our guide to product transfer vs remortgage.

How does the interest cover ratio decide how much you can remortgage?

The interest cover ratio (ICR) is the rule that the monthly rent must cover the mortgage interest, calculated at a stressed rate, by a set margin. The formula is: maximum loan = annual rent ÷ ICR ÷ stress rate. Under the Prudential Regulation Authority’s Supervisory Statement SS13/16, lenders must test at a minimum of 5.5%, or the pay rate plus 2% where that is higher, unless the rate is fixed for five years or more, in which case lenders can stress at or close to the pay rate. The ICR itself is usually 125% for basic-rate taxpayers and limited companies and 145% or more for higher-rate taxpayers, because Section 24 stops individual landlords deducting mortgage interest from rental income for tax.

Published example, as shown on The Mortgage Works intermediary criteria in September 2026:

Two things stand out. First, a like-for-like remortgage with no extra borrowing gets a softer stress at this lender than one that raises capital. Second, a higher-rate taxpayer needs 28% more rent than a basic-rate taxpayer for the same loan. Other lenders set different numbers, which is why the same property can borrow very different amounts depending on where it is placed.

Why does rent now matter more than property value when you remortgage?

Because the interest cover test, not the loan-to-value limit, is now the ceiling on most buy to let remortgages. When stress rates sat around 5.5% and rents lagged house prices, landlords who bought or last refinanced in 2020 or 2021 often find the valuation says they can borrow 75% but the rent only supports 55% to 65%. Lenders lend the lower of the two figures. That is why a revaluation alone rarely unlocks equity: you need the rent to have moved too.

Worked example: same property, two tax positions

A two-bed terrace is valued at £250,000 and let at £1,000 a month, so annual rent is £12,000. The existing mortgage is £160,000 interest only. Maximum loan at 75% LTV is £187,500. Here is what the rent supports at a 5.5% stress rate:

Now switch the higher-rate landlord to a 5 year fix stressed at a 4.5% pay rate: £8,276 ÷ 0.045 = £183,911. The same property now refinances comfortably. Three fixes exist when the rent does not cover: a 5 year fix stressed at pay rate, a lender that allows top slicing (using your personal income to make up the rental shortfall), or a product transfer that avoids the test altogether. Use our buy to let mortgage calculator to run your own figures.

Can you remortgage a buy to let to release equity for another deposit?

Yes. Raising capital from one rental property to fund the deposit on another is the most common reason landlords remortgage, and most mainstream buy to let lenders accept it. The limits are the same as any remortgage: maximum LTV (usually 75%, some lenders 80%), the interest cover test on the new, larger loan, and an acceptable purpose. The lender will ask what the money is for and may ask for evidence. The Mortgage Works, for example, states in its September 2026 criteria that raising capital for non-business purposes, including a deposit on a buy to let property, will be considered, as will non-structural home improvements. It does not accept capital raising for unregulated investments or business purposes, except where the funds buy residential buy to let property in your own name or an SPV, and it does not accept money raised to fund development and sale of property.

For a residential equity release rather than a rental one, see remortgaging to release equity.

Can you remortgage a buy to let into a limited company?

No. Moving a rental property from your personal name into a limited company is not a remortgage; it is a sale. The company buys the property from you at market value, so it needs its own limited company buy to let mortgage, and your existing personal mortgage is redeemed. That sale has tax consequences on both sides. The company pays stamp duty land tax on the full market value, because the connected company rule treats the transfer as at market value whatever price you set, and the 5% higher rates surcharge applies. You, as the seller, are treated as disposing of the property at market value for capital gains tax, currently charged at 18% or 24% on residential property gains. In Scotland the equivalent is LBTT with the 8% Additional Dwelling Supplement; in Wales it is Land Transaction Tax at the higher residential rates.

Some landlords with a genuine property business may qualify for incorporation relief, and partnerships can raise different questions. Those are accountant decisions, not mortgage decisions. Get written tax advice before instructing us, then we arrange the company mortgage. Our limited company buy to let mortgage guide explains the lending side.

Is a 5 year fix better for a buy to let remortgage?

Often, yes, and not only for rate certainty. A 5 year fix is frequently the only way a higher-rate taxpayer’s property passes the interest cover test, because the PRA rules let lenders stress a five year or longer fix at or near the pay rate instead of 5.5% or pay rate plus 2%. On a 2 year fix at 4.2%, the stress rate becomes 6.2% (4.2% plus 2%). On a 5 year fix at 4.5%, some lenders stress at 4.5%. On the worked example above, that difference is over £30,000 of borrowing capacity.

The trade-offs are real. Five year fixes carry early repayment charges for longer, often starting at 5% of the balance and stepping down each year, so selling or refinancing in year two or three can cost thousands. If you plan to sell, move the property into a company, or refinance again to buy more, a shorter fix or a tracker with no early repayment charges may be better despite the tighter stress test. Compare current pricing on our buy to let mortgage rates page.

What happens if your buy to let deal ends and you do nothing?

You move onto the lender’s standard variable rate or buy to let reversion rate, and it is usually expensive. The Tipton & Coseley Building Society, for example, shows a Buy to Let Variable Rate of 8.19% on its intermediary product pages in September 2026. On a £160,000 interest-only mortgage, that is £1,092 a month (£160,000 × 8.19% ÷ 12), against £600 a month on a 4.5% fixed rate: an extra £492 a month, or £5,904 a year, straight off your rental profit.

The fix is simple: start the review 6 months before expiry. Remortgage offers typically last 3 to 6 months, and a product transfer can usually be booked 3 to 4 months ahead. There is no penalty for being early, and you can switch to a better deal if rates fall before completion. The only scenario where sitting on the reversion rate makes sense is a short gap before a planned sale, when the SVR has no early repayment charge and a new fix would. We explain the wider picture in our guide to what happens when a fixed rate ends.

What changes when you own four or more mortgaged properties?

Once you have four or more mortgaged buy to let properties, you are a portfolio landlord under SS13/16 and a remortgage on any one of them triggers a portfolio-level assessment. The lender looks at every mortgaged property you own, personally, jointly or through a company you control, not just the one being refinanced. Expect to provide a property schedule (address, value, loan, rent, lender, rate for each), a business plan, a cash flow forecast, and often 3 to 6 months of rental bank statements and SA302s or company accounts.

Lenders then apply limits across the whole portfolio: an aggregate LTV cap (commonly 65% to 75%), an aggregate interest cover test, and sometimes a maximum number of properties or total exposure with them. One weak property can sink the remortgage of a strong one. Some lenders have built products specifically for this: Paragon launched a multi-property proposition in November 2025 that lets landlords with four or more properties apply for several in one application. Our portfolio landlord mortgage guide covers the full calculation and lender limits.

How does the Renters’ Rights Act affect remortgaging a buy to let?

From 1 May 2026, the Renters’ Rights Act converted assured shorthold tenancies in England into assured periodic tenancies with no fixed term, abolished section 21 no-fault evictions, and lets tenants leave on two months’ notice. For remortgaging, the main question is whether the new lender accepts a periodic assured tenancy. The large mainstream lenders have updated their conditions: Barclays states that letting under a periodic assured tenancy that complies with the Act is acceptable under its buy to let mortgages, and The Mortgage Works lists assured tenancies as acceptable in its current criteria.

In practice, lenders now ask for a tenancy agreement rather than a fixed-term AST, and some underwriters look harder at void risk and rent levels because tenants can leave with shorter notice. Rent evidence matters more than it did: the valuer’s rental figure drives the interest cover test, and a current tenancy at market rent is your best support. Wales (occupation contracts) and Scotland (private residential tenancies) have their own regimes, which lenders already accept. If your lender has sent a notice about tenancy terms, check it before assuming you are covered.

Which lenders offer buy to let remortgages in 2026?

The buy to let lender market has changed more in the last 12 months than in the previous five. Kent Reliance, one of the largest specialist buy to let lenders, stopped taking new buy to let applications on 17 December 2025. Precise, OSB Group’s other specialist brand, has moved its buy to let lending to the Rely brand. That leaves landlords with a mix of high street lenders, building societies and specialists, each with its own rent calculation.

Criteria change monthly, so treat any published rule as a snapshot. As a whole-of-market broker we check live criteria and pricing on the day we place the case.

Why do buy to let remortgages get declined, and how do you fix it?

Most buy to let remortgage declines come down to the same handful of issues, and nearly all of them are fixable if spotted before the application goes in.

An illustrative Knox case: higher-rate landlord, five properties, equity for the next deposit

This is an anonymised, illustrative scenario based on the type of case we handle. A higher-rate taxpayer with five mortgaged properties had a 2021 two year fix that had rolled into a 2023 fix now ending. One property, valued at £280,000 with a £150,000 loan and rent of £1,300 a month, was the obvious source of a deposit. The high street lender’s 2 year products stressed at 6.4%, limiting the loan to about £168,000 at 145% ICR: barely enough to cover fees. We placed the case with a portfolio lender on a 5 year fix stressed at its 5.0% pay rate (£15,600 ÷ 1.45 ÷ 0.05 = £215,172, capped at 75% LTV), raising the loan to £210,000 (75% LTV) and releasing £60,000 for the next deposit. The other four properties went onto product transfers with their existing lenders, avoiding a portfolio-wide re-underwrite on properties that did not need one.

Frequently asked questions

Can I remortgage my buy to let with my current lender?

Yes. Your current lender will usually offer a product transfer: a new rate on the same loan with no valuation, no solicitor and, if you are not borrowing more, usually no fresh rental affordability test. It is often the right choice when rent cover is tight. Compare it against the whole market first, because retention rates are not always competitive.

How much equity do I need to remortgage a buy to let?

Usually at least 25%. Most buy to let remortgages go up to 75% loan to value, with some lenders offering 80% at higher rates. If you want to release cash, you need enough equity to stay under the cap after the raise, and enough rent to pass the interest cover test on the bigger loan.

How long does a buy to let remortgage take?

Typically 4 to 8 weeks from application to completion. Valuation, legal work and portfolio paperwork are the usual delays. Start 6 months before your fix ends, since most offers last 3 to 6 months. A product transfer with your existing lender can complete in days.

Can I remortgage a buy to let to buy another property?

Yes. Raising a deposit for another buy to let is an accepted purpose at most mainstream lenders, including The Mortgage Works per its September 2026 criteria. The new loan must still fit the LTV cap and pass the rental interest cover test.

What is the interest cover ratio for a buy to let remortgage?

Usually 125% for basic-rate taxpayers and limited companies, and 145% to 160% for higher-rate taxpayers. It is tested at a stress rate of at least 5.5% or the pay rate plus 2%, unless you take a 5 year or longer fix, which lenders can stress at or near the pay rate.

Is it worth remortgaging a buy to let if rates are higher than my current deal?

Usually yes, because the alternative is the reversion rate, often above 8% for buy to let. The question is not old rate versus new rate; it is new fixed rate versus the lender’s variable rate. Review your options 6 months before the deal ends.

Can I transfer my buy to let to a limited company by remortgaging?

No. The company has to buy the property from you at market value. That triggers stamp duty land tax (including the 5% surcharge) for the company and capital gains tax for you. Take accountant advice first, then the company takes out its own limited company buy to let mortgage.

Do lenders accept periodic tenancies after the Renters’ Rights Act?

Yes. Since 1 May 2026 most lenders accept assured periodic tenancies in England. Barclays, for example, states that a periodic assured tenancy compliant with the Act is acceptable under its buy to let mortgages. Check your own lender’s conditions and keep a current tenancy agreement on file.

Speak to a buy to let remortgage broker

Knox Mortgages is a whole-of-market broker for landlords with one property or fifty. We model product transfer against remortgage, run the interest cover numbers across lenders, and structure equity releases so the next purchase is funded without re-underwriting properties that do not need it. Book a free discovery call and bring your property schedule.

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Knox Mortgages is a trading style of Fort Advice Bureau which is regulated and authorised by the FCA to conduct Mortgage and Protection business, FRN: 972730