How Much Deposit Do You Need for a Buy-to-Let in 2026?

Quick answer

For a standard residential buy-to-let in 2026, expect to put down a 25% deposit — that's the mainstream 75% loan-to-value (LTV) tier where most lenders and the best rates sit. A few lenders will go to 80% or even 85% LTV (a 20% or 15% deposit), but at higher rates and bigger fees.

So on a £200,000 property:

• 25% deposit: £50,000 (most common)
• 20% deposit: £40,000 (fewer lenders, higher rate)
• 15% deposit: £30,000 (rare, expensive)

But the headline LTV is only half the story. The amount you can actually borrow is usually capped by a rental cover stress test, and for higher-rate taxpayers that test routinely pushes the required deposit above 25%.

Why salary barely matters

On a residential mortgage for your own home, lenders lend a multiple of your income (typically 4.0–4.5×). Buy-to-let is different. The lending decision is driven mainly by the rent the property will generate, tested against the mortgage interest. Your personal income matters for a minimum-income screen (many lenders want £20,000–£25,000+) and affordability sanity checks, but it is not the multiplier.

This is the single most important thing to understand: a high salary will not get you a bigger BTL loan. The rent does that. Which is why the deposit you need is really a function of rental yield and the lender's stress rate.

The rental cover (ICR) test — the real deposit driver

Lenders apply an interest cover ratio (ICR): the monthly rent must exceed the monthly mortgage interest by a set margin, calculated at a stress rate (a notional rate higher than the one you'll actually pay).

Two figures matter:

• ICR percentage: typically 125% for basic-rate and limited-company borrowers, and 145% for higher- and additional-rate taxpayers.
• Stress rate: often around 5.5% for 5-year fixes, but 7–8%+ for 2-year fixes (the longer fix gets a gentler stress, which is why many landlords choose 5-year products).

Worked example — £200,000 flat, £1,100/month rent

Annual rent: £13,200, so monthly rent £1,100. Let's see the maximum loan each ICR/stress combination supports.

The formula is: Maximum loan = (annual rent ÷ ICR ÷ stress rate).

For a basic-rate borrower on a 5-year fix, the rent comfortably supports a 75% LTV loan, so the 75% LTV cap (a 25% deposit) is the binding constraint.

For a higher-rate borrower on a 2-year fix, the rent only supports a £121,400 loan — meaning a 39% deposit on this property. The stress test, not the LTV limit, is what forces the bigger deposit.

This is exactly why higher-rate landlords so often "need 25% or more": on lower-yielding properties the ICR maths frequently demands 30–40% down to make the numbers work.

Yield is what unlocks a smaller deposit

Because the loan is rent-driven, higher-yielding properties let you put down less. The same £50,000 deposit goes much further on a high-yield Northern terrace than a low-yield Southern flat.

On the Liverpool terrace, the rent supports more than 75% LTV, so you simply put down the standard 25% deposit (£32,500). On the London flat, the rent may not stretch to support a 75% loan after the 145% test, so you need a bigger deposit than 25% to get the deal done.

The rule of thumb: above roughly 7% gross yield, the 25% deposit/75% LTV cap is your constraint; below it, the ICR stress test usually demands more.

The deposit is not your only cash outlay

It's a common and expensive mistake to budget only for the deposit. On a £200,000 BTL in England as an additional property, the real cash needed looks like:

• Deposit (25%): £50,000
• SDLT — standard bands plus the 5% additional-dwellings surcharge: roughly £11,500 on £200,000 (the 5% surcharge alone is £10,000)
• Legal fees and searches: £1,500–£2,000
• Survey/valuation: £400–£800
• Mortgage arrangement fee: often £1,000–£2,000 (or ~2% of the loan, sometimes added to the loan)
• Void and repairs buffer: ideally 3–6 months' costs in reserve

So the deposit is around £50,000, but the total cash to complete is closer to £65,000, before you hold anything back for emergencies. The SDLT surcharge in England has been 5% since 30 October 2024 (it was previously 3%). Scotland's LBTT Additional Dwelling Supplement and Wales' LTT higher rates work differently and are higher again, so check the right nation.

You can also link this to your wider finances: if you're funding a deposit from salary and savings, our take-home pay calculator shows what you actually keep each month (Personal Allowance £12,570, higher-rate threshold £50,270, employee NI at 8% then 2% above the upper limit), and the stamp duty calculator handles the additional-dwellings surcharge for you.

Does a bigger deposit pay off?

Beyond just getting the deal approved, a larger deposit has two real benefits in 2026:

1. Better rates at lower LTV. BTL pricing usually steps down at 75%, 65% and 60% LTV. Dropping from 75% to 60% LTV can shave 0.3–0.6% off the rate, which on a £140,000 loan is £400–£840 a year.
2. More headroom on the ICR test. A bigger deposit means a smaller loan, which clears the rental cover test more easily — useful on lower-yield properties or when rates are stressed at 2-year levels.

The trade-off is return on equity. Putting in more cash reduces leverage, and leverage is a large part of how BTL historically generated returns. There's no single right answer — model both a 25% and a 40% deposit and compare the cash-on-cash return.

Personal name vs limited company

Since the Section 24 changes fully bit in 2020, higher-rate landlords in personal name can only claim a 20% tax credit on mortgage interest rather than deducting it in full. That has pushed many new buyers toward limited-company (SPV) structures, where mortgage interest remains fully deductible against profits.

For deposits specifically:

• Company BTL mortgages are typically assessed at the gentler 125% ICR (because companies pay Corporation Tax, not 40% income tax), which can mean the rent supports a larger loan and therefore a smaller deposit than the same person buying personally as a higher-rate taxpayer.
• But company BTL rates and fees are usually a touch higher, and many lenders want personal guarantees plus sometimes a higher minimum deposit (often still 25%).

So counter-intuitively, a higher-rate landlord may need less deposit buying through a company than in their own name on the same property — because the ICR test is kinder. Whether the company route is right overall depends on your wider tax position, not just the deposit.

How to size your deposit — a simple process

1. Estimate achievable rent for the specific property and area (use letting-agent comparables, not optimistic figures).
2. Pick a stress scenario: higher-rate buyer? Use 145% ICR. Choosing a 5-year fix? Use a ~5.5% stress rate; a 2-year fix means 7–8%.
3. Calculate the max loan: annual rent ÷ ICR ÷ stress rate.
4. Compare to 75% LTV: the lower of (max loan) and (75% of price) is your borrowing ceiling.
5. Deposit = price − borrowing ceiling, then add SDLT, fees and a buffer on top.

Run a couple of properties through this and the pattern becomes obvious: yield and tax band drive the deposit far more than the advertised LTV.

Common mistakes

1. Assuming 25% is always enough — on low-yield property as a higher-rate taxpayer, the ICR test can demand 35–40%.
2. Forgetting the 5% SDLT surcharge — it's a five-figure sum on most purchases and is not part of the deposit.
3. Choosing a 2-year fix to get a lower rate, then failing the harsher 2-year stress test — many landlords take 5-year fixes specifically for the gentler ICR.
4. No void/repairs buffer — a single boiler replacement plus two void months can wipe out a year's profit.
5. Ignoring your tax band — basic-rate and limited-company borrowers can often borrow more (smaller deposit) than higher-rate personal-name buyers on the identical property.

Sources

• HMRC: Stamp Duty Land Tax: higher rates on additional dwellings
• HMRC: Restricting finance cost relief for individual landlords (Section 24)
• Bank of England / PRA: Underwriting standards for buy-to-let mortgage contracts (SS13/16)
• gov.uk: Renting out a property — tax on income