Rising Mortgage Rates in 2026: What UK Landlords Need to Know

What's happening to UK mortgage rates in March 2026?

UK fixed mortgage rates have risen sharply through February and March 2026, reaching their highest levels in almost a year. The average 2-year fixed rate hit 5.31% and the 5-year fixed rate reached 5.35%, according to Moneyfacts data.

The scale of repricing has been dramatic. In a single week in mid-March, lenders pulled and repriced over 25,000 mortgage products — a volume that exceeds even the September 2022 mini-budget crisis, when Liz Truss's unfunded tax cuts sent gilt yields spiralling.

To put the shift in context:

BTL mortgage rates typically carry a premium of 0.5-1% above residential rates, meaning many landlords remortgaging are now looking at rates of 5.8-6.5% depending on their loan-to-value ratio and portfolio size.

For landlords who locked in at 2-3% during 2021 and early 2022, the payment shock on remortgaging is severe. On a typical £200,000 interest-only BTL mortgage, the difference between 2.5% and 5.8% is an additional £550 per month — or £6,600 per year — in mortgage costs alone.

Why are mortgage rates rising?

Fixed mortgage rates are driven by gilt yields (the interest rate the UK government pays on its bonds), not by the Bank of England base rate directly. In March 2026, gilt yields have spiked due to a combination of global and domestic factors.

Global instability and energy prices

The escalation of conflict involving Iran has driven oil prices higher, feeding through to wholesale energy costs. Higher energy prices directly increase UK inflation expectations, which pushes gilt yields up as investors demand higher returns to compensate for expected inflation.

Bank of England holding at 4.5%

The Bank of England held the base rate at 4.5% at its March 2026 meeting. While many had expected a series of rate cuts through 2026, the MPC has been cautious in the face of persistent services inflation and rising energy costs. The April meeting is now described by analysts as a "knife-edge" decision, with some members arguing for a hike rather than a hold.

Inflation forecast rising

UK inflation forecasts for 2026 have been revised upward to approximately 3.5%, well above the Bank of England's 2% target. As long as inflation remains above target, the path to rate cuts is blocked. Markets have responded by pricing in the possibility that the next base rate move could be upward rather than downward.

Swap rate movements

The 2-year and 5-year swap rates — the wholesale rates that lenders use to price fixed-rate mortgages — have risen sharply in sympathy with gilt yields. Lenders have limited ability to absorb these increases, so they pass them through to borrowers in the form of higher product rates. The speed of repricing (25,000+ products in a week) reflects lenders racing to keep their margins intact.

How does this affect buy-to-let landlords specifically?

BTL landlords face a unique combination of pressures that make rising mortgage rates particularly damaging compared to homeowners. The interaction between higher mortgage costs, Section 24 tax rules, and rental income creates a situation where some landlords are paying tax on profits that don't exist as actual cash.

Higher remortgaging costs

The most immediate impact is on landlords whose fixed-rate deals are expiring. An estimated 1.8 million fixed-rate mortgages expire in 2026, and a significant proportion of these are BTL mortgages taken out during the low-rate era of 2021-2022.

Consider a typical scenario:

That £550/month reduction in cash surplus — £6,600/year — comes before other property expenses like insurance, maintenance, letting agent fees, and compliance costs. For many landlords, it turns a comfortable profit into a marginal operation or an outright loss.

Rental yield compression

Gross rental yields have improved in many areas over recent years, but net yields — after mortgage costs — are being compressed by rising rates. A property yielding 6% gross may only yield 1-2% net once you factor in a 5.8% mortgage on a 75% LTV.

The maths:

• Property value: £250,000
• Annual rent: £15,000 (6% gross yield)
• Mortgage (75% LTV): £187,500 at 5.8% = £10,875/year interest
• Operating expenses: ~£2,500/year (insurance, repairs, voids, compliance)
• Net cash flow: £1,625/year (0.65% net yield on property value)

Before considering tax. Which brings us to the real problem.

The 1.8 million mortgage time bomb

The sheer volume of fixed-rate mortgages expiring in 2026 creates a systemic pressure. Many of these borrowers locked in at historically low rates and have not yet experienced the full impact of the rate environment. As each mortgage reaches its expiry, the landlord faces a binary choice: remortgage at significantly higher rates, or sell.

This creates downward pressure on property prices in some areas, particularly in the BTL-heavy markets of the North West, North East, and Midlands, where yields are already thin and rental growth has been more modest.

Section 24 and rising rates: the double squeeze

Section 24 of the Finance (No. 2) Act 2015 prevents individual landlords from deducting mortgage interest as a business expense. Instead, they receive a 20% tax credit on finance costs. When mortgage rates were 2-3%, this was painful but manageable. At 5-6%, it becomes devastating.

Here's how the double squeeze works in practice:

Worked example: the same property at different rates

Under pre-Section 24 rules, you'd pay tax on your actual profit. At 5.8%, that's £400. Even at 40% tax, you'd owe £160.

Under Section 24, here's what happens:

At the higher rate, this landlord has £400 in actual cash profit but a £2,480 tax bill. After tax, they're losing £2,080 per year on a property that HMRC considers profitable. This is the Section 24 double squeeze: rising rates increase your costs but don't reduce your taxable income.

The larger your mortgage and the higher the rate, the worse it gets. For landlords with multiple properties, this effect is multiplied across the portfolio.

What landlords should do now

The current rate environment demands proactive portfolio management. Waiting and hoping for rate cuts is not a strategy — every major forecaster has pushed back their rate cut expectations, and many now see no cuts at all in 2026.

1. Lock in a rate before your deal expires

Most BTL lenders allow you to lock in a rate 3-6 months before your current fixed-rate expires. Even if rates feel high now, they could go higher. Securing a rate today gives you certainty and protection. If rates do fall, many lenders allow you to switch to a better product before completion.

Talk to a broker about your options. Product-transfer rates (staying with your existing lender) are sometimes competitive, but you won't know without comparing the market. Brokers with BTL specialisms include L&C Mortgages, John Charcol, and Habito.

2. Stress-test your portfolio

Run the numbers at current rates for every property in your portfolio. For each property, calculate:

• Monthly mortgage payment at the new rate
• Net cash flow after all expenses
• Tax position under Section 24
• Effective return on equity

If a property is cash-flow negative after tax at current rates, you need to decide whether to hold (hoping for future capital appreciation and eventual rate relief) or sell (freeing up equity for better-performing assets or debt reduction).

3. Review every allowable expense

When margins are tight, every deduction matters. Make sure you're claiming all allowable expenses including:

• Letting agent fees and property management costs
• Insurance premiums (landlord, building, contents, rent guarantee)
• Maintenance and repair costs (but not improvements)
• Ground rent and service charges
• Accountancy and legal fees related to the property
• Travel costs for property management (at HMRC approved rates)
• Replacement of domestic items (furniture, appliances, kitchenware)

4. Consider your holding structure

Limited companies can still deduct mortgage interest in full before paying corporation tax at 25%. For higher-rate taxpaying landlords with high LTV mortgages, the limited company structure offers significant advantages in the current rate environment.

However, transferring existing properties into a company triggers Capital Gains Tax and Stamp Duty Land Tax, so this decision requires careful analysis of your specific situation. It often makes more sense for new purchases than for existing portfolio restructuring.

5. Get your MTD compliance in order

Making Tax Digital becomes mandatory for landlords with income over £50,000 from 6 April 2026 — just weeks away. This means quarterly digital reporting of income and expenses to HMRC. With rising rates squeezing margins, having accurate, up-to-date financial data on each property is more important than ever.

If your rental income is above the threshold, you need MTD-compatible software in place now.

6. Consider rent reviews

If your property costs have risen significantly, a rent review may be necessary. The Section 13 process provides a legal framework for increasing rents to market levels. However, balance this against tenant retention — void periods are expensive, and a reliable tenant at a slightly below-market rent is often more valuable than maximum rent with higher turnover.

7. Reduce debt where possible

If you have savings or properties with significant equity, consider whether overpaying mortgages or paying down higher-rate debt makes sense. Reducing your LTV may also unlock better remortgage rates — many lenders offer meaningfully better rates at 65% LTV compared to 75% LTV.

Rate forecast: what happens next?

The consensus among forecasters has shifted significantly in March 2026. The expectation of multiple Bank of England rate cuts through 2026 has been replaced by growing uncertainty about whether any cuts will happen this year.

Bank of England outlook

The BoE base rate stands at 4.5%. The March 2026 MPC meeting voted to hold, but the vote split was notable — some members argued for a rate increase given persistent services inflation. The April meeting is now seen as genuinely uncertain, with a rate hike no longer considered impossible.

Major forecasts

What could change the picture

The key variables are:

• Energy prices: If the Iran conflict de-escalates and oil prices fall, inflation expectations would ease and gilt yields could decline, bringing mortgage rates down.
• Inflation data: If April and May inflation prints come in below expectations, the BoE may find room to cut in H2 2026.
• Global trade: Any resolution to the US-China tariff situation or broader global trade tensions could reduce uncertainty and support lower yields.
• Labour market: A weakening jobs market would give the BoE cover to cut rates even with above-target inflation.

The base case for landlords should be: plan for rates to stay at current levels or go slightly higher through 2026, with any meaningful relief arriving in 2027 at the earliest.

Personal vs limited company: does the structure matter more now?

Yes. The higher mortgage rates go, the more the limited company structure benefits landlords — because companies can still deduct mortgage interest in full, while individuals cannot.

The tax maths at 5.8% mortgage rates

Using the same £200,000 mortgage at 5.8% (£11,600/year interest) on a property generating £14,400/year rent:

The difference is stark: £2,480 vs £100 in tax on the same property with the same mortgage. The company pays tax on the actual profit (£400), while the individual pays tax on an inflated "profit" figure (£12,000).

When company structure makes sense

• New purchases: Buying new BTL properties through a company is almost always more tax-efficient at current rates for higher-rate taxpayers.
• Higher-rate taxpayers with high LTV: The larger your mortgage relative to rental income, the bigger the Section 24 penalty.
• Portfolio landlords: Four or more properties — the efficiency gains compound across the portfolio.

When it doesn't make sense

• Existing properties: Transferring triggers CGT (on any gain) and SDLT (at the higher additional property rate of 5%). The transfer costs may outweigh years of tax savings.
• Basic-rate taxpayers: If you're already paying 20% tax, the Section 24 credit offsets most of the impact.
• Properties near mortgage-free: If you have little or no mortgage, Section 24 barely affects you.

For a detailed comparison, see our guide: Should landlords use a limited company?

How to know which properties are at risk

The landlords who get caught out by rate rises are the ones who don't know their numbers at a per-property level. Knowing your portfolio average return isn't enough — you need to know exactly which properties are margin-negative and which are supporting the portfolio.

For each property, you should be tracking:

• Gross yield: Annual rent / property value
• Net yield: (Annual rent - all costs including mortgage) / property value
• Cash flow: Monthly rent - monthly mortgage - monthly expenses
• Tax position: What HMRC considers your taxable profit (under Section 24 rules)
• Cash after tax: Actual cash left after paying the tax bill

If any property shows a negative "cash after tax" figure at current mortgage rates, it's actively losing you money. That doesn't necessarily mean you should sell — capital appreciation expectations, portfolio strategy, and your personal tax situation all factor in — but you need to know.