Buying a Property

How Your Deposit Size Affects How Much You Can Borrow

Your deposit does more than reduce the loan you need — it directly influences the maximum income multiple available, the interest rate you pay, and which lenders will consider your application. This guide explains the relationship between deposit size and mortgage borrowing power in 2026.

Published: 1 Jan 2026 · Updated: 1 Mar 2026 · 7 min read

Deposit and Borrowing Power — The Relationship Explained

Your deposit affects your mortgage in three distinct ways:

1. It directly reduces the loan you need (smaller loan = lower monthly payment)

2. It determines your loan-to-value (LTV) ratio, which governs which lenders and products are available

3. In some cases, a higher deposit unlocks access to higher income multiples

Understanding all three effects together gives you a complete picture of why saving more before buying can be more powerful than the headline numbers suggest. Use our [mortgage affordability calculator](/mortgage-calculator) to model different deposit scenarios against your income.

What Is Loan-to-Value (LTV)?

LTV is simply the mortgage loan expressed as a percentage of the property's purchase price (or surveyed value, whichever is lower).

**Calculation:** Loan ÷ Property Value × 100

If you are buying a £300,000 property with a £30,000 deposit:

Loan needed: £270,000
LTV: 270,000 ÷ 300,000 × 100 = **90%**

If your deposit were £60,000:

Loan needed: £240,000
LTV: 240,000 ÷ 300,000 × 100 = **80%**

The lower the LTV, the better — from a lender's perspective you represent lower risk, because there is more equity cushion between the loan and the property's value.

The LTV Tiers That Matter

Mortgage products are priced in bands. The key thresholds in 2026 are:

LTV	Deposit required	Notes
95%	5%	Highest rates; restricted product range; some lenders only
90%	10%	Broader choice; mainstream lender access
85%	15%	Significantly better rates; 5x products begin to appear
80%	20%	Strong product choice; best rates begin
75%	25%	Best mainstream rates; widest lender choice
60% or below	40%+	Lowest available rates

The step-changes at 90%, 85%, and 75% are particularly significant. A buyer with a 14% deposit is in a materially worse position than one with 15%, even though the cash difference on a £250,000 property is only £2,500.

How Deposit Affects Maximum Income Multiple

Most lenders' headline 4.5x income multiples are available from 90% LTV downwards. However:

**95% LTV:** Many lenders cap at 4.0x or even 3.75x, reflecting the higher risk
**85% LTV and below:** Standard 4.5x; some lenders begin offering 5x for qualifying income levels
**80% LTV and below:** 5x products are more widely available from the specialist lenders who offer them

This creates a compounding effect. A buyer who stretches to a 15% deposit (versus 10%) both reduces the loan needed *and* gains access to a higher income multiple. The combined effect on maximum property price can be substantial.

**Worked example:**

Buyer earns £55,000 and has saved £45,000.

At 90% LTV, maximum income multiple = 4.25x = £233,750 loan + £45,000 deposit = **£278,750 maximum property price** (with £45,000 representing 16.1% of the property price — if they target properties just under that threshold)

Actually let's model this cleanly:

Target: £280,000 property

10% deposit: £28,000 needed (they have £45,000 — plenty). Loan: £252,000. At 4.25x cap on 90% LTV: max loan = £233,750 — **not enough**
15% deposit: £42,000 needed. Loan: £238,000. At 4.5x: max loan = £247,500 — **sufficient**

By increasing the deposit from 10% to 15% of a £280,000 purchase (£14,000 more), the buyer both reduces the loan required and accesses a higher income multiple — making the deal viable.

Rate Differences Between LTV Bands

The rate differential between LTV bands can be significant over a mortgage term.

**Indicative 2026 five-year fixed rates (approximate):**

95% LTV: 5.2–5.8%
90% LTV: 4.6–5.1%
85% LTV: 4.2–4.7%
75% LTV: 3.9–4.4%
60% LTV: 3.7–4.2%

On a £200,000 mortgage over 25 years:

At 5.5% (95% LTV): monthly payment ~£1,287; total interest ~£186,100
At 4.0% (75% LTV): monthly payment ~£1,056; total interest ~£116,800

The difference is ~£69,300 in total interest over the life of the mortgage — more than the additional deposit required to get from 95% to 75% LTV.

Sources of Deposit

Lenders require you to confirm where your deposit comes from. Acceptable sources include:

**Personal savings** — most straightforward; bank statements required
**Help from family** — gifted deposits are accepted by most lenders but require a signed gift letter confirming it is not a loan; the donor may be asked to confirm their own financial position
**Equity from a previous property** — if you have owned before and are selling
**LISA (Lifetime ISA)** — the government adds a 25% bonus on up to £4,000/year saved in a LISA; the bonus can be used as part of a deposit on a first home priced up to £450,000

**Not acceptable** as deposit sources (or requiring explanation):

Cash
Loans (including loans from family — if the gift letter is not genuine, this is mortgage fraud)
Gambling winnings
Cryptocurrency proceeds (some lenders accept with full transaction history)

Saving More Deposit — Is It Always Worth It?

Saving a larger deposit takes time, and during that time property prices and rental costs may change. Whether it is worth waiting depends on:

The rate differential between your current LTV band and the next one
Your rental cost while saving
Your estimate of property price movement in your target market

Use our [mortgage affordability calculator](/mortgage-calculator) to compare scenarios — model what you can borrow today versus what you could borrow after 12 more months of saving — and make the decision based on your specific numbers.