Buy-to-Let Mortgage Options in 2026: What Landlords Should Know

The buy-to-let mortgage market has shifted significantly since the start of 2024. Bank of England base rate movements, tighter lender stress tests, EPC-linked lending decisions, and the ongoing effect of Section 24 mean that re-mortgaging now is materially different from re-mortgaging three years ago. Whether you're buying a new investment property or fixing out an existing deal, this guide covers your options + what's actually worth optimising in 2026.

Types of buy-to-let mortgage

Fixed rate

Your interest rate stays the same for a set period — typically 2 or 5 years. Provides certainty for budgeting and cashflow forecasting. You'll know exactly what your mortgage costs will be each month, which makes the Section 24 calculation predictable and rent-setting easier.

2-year fixes give flexibility (refinance again sooner), 5-year fixes lock in current rates against future rises but charge early-repayment penalties (usually 1-5% of the outstanding balance) if you exit early. As of mid-2026 the 5-year average BTL fix sits around 5.0-5.5% for 75% LTV; 2-year fixes typically slightly higher. Rates change quarterly; check current best buys before committing.

Variable rate (tracker)

Tracks the Bank of England base rate plus a margin (e.g. base + 1.5%). Your payments go up and down with rate changes. Lower initial rates than fixed, but less predictable. Good when you expect base rate to fall; bad if rates rise unexpectedly.

Pure variable rates are rare in BTL today; most "trackers" are 2-year or 5-year fixed-margin trackers (the margin is fixed, the base rate varies). Read the small print on the early-repayment charge structure — some trackers carry no penalty (you can switch any time), others lock you in for 2-5 years.

Interest-only vs repayment

Most buy-to-let mortgages are interest-only, meaning you only pay the interest each month — not the capital. This keeps monthly costs low and maximises gross yield, but means you'll need a repayment strategy (usually selling the property or remortgaging later) when the term ends.

Repayment BTL mortgages exist but are less common. They're worth considering if your goal is to own the property outright at retirement, you have spare cashflow, and you're willing to trade lower monthly profit for forced equity-building. The arithmetic favours interest-only for most active landlords because the principal can be deployed elsewhere (next property, ISA, pension) at higher returns than mortgage equity.

Key factors for 2026

• Stress testing: Lenders stress-test at 5.5% or higher, meaning your rental income must cover the mortgage at that rate — typically at 125-145% coverage. Higher-rate taxpayers usually need 145% coverage; basic-rate 125%. If you fail the stress test, you can't borrow up to your desired LTV.
• Portfolio landlord rules: If you have 4+ mortgaged properties, expect more scrutiny from lenders on your whole portfolio. Many lenders require a portfolio business plan, cashflow forecast across all properties, and stress test the whole portfolio rather than the individual property.
• EPC requirements: Some lenders (notably specialist BTL lenders + a few high-street banks) are already requiring minimum EPC ratings of C for new lending, ahead of the 1 October 2030 PRS MEES standard. If your property is currently EPC D or below, your remortgage options narrow — and the rate premium can be 0.5-1.0% above market for non-C properties.
• Section 24: Mortgage interest is no longer a deductible expense — it's a 20% tax credit instead. Higher-rate taxpayers feel this most: every £1,000 of interest produces £200 of tax credit instead of £400 of tax saving from deduction. Limited-company mortgages still treat interest as a deductible business expense; this is the main driver behind incorporation.
• Limited company vs personal: If you're considering moving properties into a limited company to escape Section 24, the SDLT on the transfer (3% additional + standard rates) and CGT triggered by the disposal often outweigh the Section 24 saving for portfolios under 5 properties. Run the maths properly with an accountant — see our limited company buy-to-let guide + incorporating an existing portfolio.

When to remortgage

• Before your fixed rate ends: Start shopping 3-6 months before. Most offers are valid for 3-6 months, which means you can lock in a deal early and switch if better rates appear later. Don't drift onto the lender's standard variable rate (SVR) — these are typically 2-3% above market.
• When rates drop significantly: If variable rates have dropped well below your fixed rate, it might be worth switching (check early repayment charges first — often 1-5% of outstanding balance). Run the full maths: ERC + new arrangement fee + valuation fee vs the saved monthly interest over the remaining term.
• When you want to release equity: Remortgaging up to a higher LTV can release capital for your next purchase, but check the new monthly payment fits your stress test + delivers acceptable post-Section-24 yield. Some lenders charge fees on capital release that wipe out the early benefit.
• When EPC improvements would unlock a better rate: If a £4-5k EPC improvement (insulation + boiler) takes you from D to C, you may save 0.5-1.0% on the next deal. On a £200k mortgage, that's £1,000-£2,000 per year — paying back the improvement in 2-5 years on the mortgage saving alone, before counting future regulatory protection.

Costs to factor in when comparing deals

• Arrangement fees — often £500-£2,000 (some BTL lenders charge as % of loan, e.g. 2% which is £4,000 on £200k).
• Valuation fees — £300-£1,500 depending on property value + lender requirements.
• Legal/conveyancing fees — £300-£1,000 if using lender's panel solicitor; higher if you bring your own.
• Early repayment charges on your current deal — typically 1-5% of outstanding balance.
• Broker fees — typically £400-£800 flat or commission-only (no upfront fee).

The "best rate" rarely produces the lowest total cost over the fix term once fees are factored in. Add up: total interest over the fix + arrangement fee + valuation + legal. Compare on total cost, not headline rate.

The 2026 outlook

BoE base rate has trended down through 2025-26. Most market commentators expect another 0.5-1.0% reduction by end-2026 if inflation stays anchored. That makes 2-year fixes attractive over 5-year right now: the 2-year locks in current rates and lets you re-fix in 2028 at potentially lower rates; the 5-year locks you in for longer + higher exit cost if rates fall further.

EPC-linked lending is the structural change worth watching. By 1 October 2030, in-scope PRS homes must meet EPC C or equivalent unless exempt; lenders are pricing the risk of D/E properties becoming harder to let into their rates today. If you hold an EPC D or E property and don't plan to upgrade, your refinance choices narrow each year.

How Tendmere helps

Use our mortgage repayment calculator to compare interest-only vs repayment costs. Use our rental yield calculator to review post-Section-24 scenarios. Inside Tendmere, track mortgage details for each property, set reminders for fixed-rate end dates and model the operating impact of rate changes. Our BTL mortgage guide explains the current record-keeping flow; the planned broker introduction is not live, so seek regulated advice independently.

Related guides

• Section 24 mortgage interest relief explained
• Remortgaging buy-to-let: when and how
• Limited company buy-to-let guide
• Incorporating an existing portfolio
• Interest rate impact on BTL landlords

This is general information, not financial advice. Mortgage decisions are individual — consult a regulated mortgage broker (FCA-authorised) for advice specific to your situation.