Deposit and LTV: Why the Bands Matter More Than the Amount
The deposit does two things, and only one of them is obvious. It reduces the amount you borrow, which reduces the payment proportionally. And it moves you into a different loan-to-value band, which changes the rate you are offered on the whole loan.
The second effect is lumpy rather than smooth, and that is what makes it exploitable: a small extra amount that crosses a threshold can be worth far more than a much larger amount that does not.
How the bands work#
Lenders do not price continuously. They publish a product range with rates for LTV bands, and the common thresholds cluster at recognisable numbers. Sitting at 80.4 per cent and sitting at 79.9 per cent are almost the same loan and frequently not the same rate.
| LTV | Deposit | Typical pricing |
|---|---|---|
| 95% | 5% | Highest rates, limited product choice |
| 90% | 10% | Materially better than 95% |
| 85% | 15% | Better again |
| 80% | 20% | A major threshold; removes mortgage insurance in some markets |
| 75% | 25% | Close to best pricing |
| 60% and below | 40%+ | Best available rates |
The exact thresholds vary by lender and market, but 90, 80, 75 and 60 recur almost everywhere. Ask your lender or broker for the specific bands before deciding how much deposit to put in.
The two mechanisms, separated#
Worth seeing side by side, because they are often conflated and they behave differently. Adding deposit always reduces the loan. It only sometimes changes the rate — but when it does, the effect applies to the entire remaining balance for the whole product period.
- Reducing the loan is linear: 10,000 less borrowed is roughly 55 less per month at 5% over 25 years.
- Crossing a band is a step: it can lower the rate on the whole loan by a quarter or half a point.
- On a 250,000 loan, half a point is roughly 70 per month — from a deposit change that might have been 5,000.
- Below the threshold, additional deposit only does the linear thing until the next band.
The practical rule: find out where the next band sits before deciding what to put in. Stopping just short of one is the most common avoidable mistake in a purchase.
Mortgage insurance and the 80 per cent line#
In several markets, lending above a threshold — commonly 80 per cent — requires insurance that protects the lender and is paid by the borrower. It is a real monthly cost with no benefit to you, and it usually falls away once the balance drops below the threshold, though the mechanism for that varies.
- In the United States, private mortgage insurance applies above 80 per cent LTV on conventional loans.
- It is normally cancellable once the balance falls below the threshold, but the process differs and is not always automatic.
- Several European markets use a lender-paid equivalent that appears in the rate rather than as a separate line.
- Our calculator adds it automatically on the markets where it applies, because leaving it out understates the payment substantially.
If you are close to the threshold, this is the sharpest argument for finding the extra deposit — you are removing a cost, not just reducing a balance.
Where the deposit comes from#
Lenders verify the source of the deposit as a matter of routine, and the answer changes what is required from you. Gifts in particular need documentation that people rarely have ready.
| Source | Usually acceptable | What is needed |
|---|---|---|
| Savings | Yes | Statements showing accumulation |
| Gift from family | Yes | A signed letter confirming it is a gift, not a loan |
| Sale of a previous property | Yes | Completion statement |
| Inheritance | Yes | Probate documentation |
| A personal loan | Almost never | It would be counted as debt anyway |
| Cryptocurrency | Sometimes | Full transaction trail; several lenders decline |
Start the gift letter early. It is a five-minute document that regularly delays completions by a week because nobody asked for it until the underwriter did.
Deposit is not the only cash you need#
In many markets the purchase taxes and fees are larger than people budget for and cannot be borrowed. In Germany they routinely add close to a tenth of the price; in Spain and Portugal the transfer tax alone can be six to eight per cent. That money has to be liquid on completion day, alongside the deposit.
- Purchase or transfer tax — the largest line in most European markets.
- Notary and registry costs, statutory in several countries.
- Agent commission, paid by the buyer in some markets.
- Lender and legal fees.
- Moving costs and immediate repairs, which nobody plans for.
Our per-market calculator adds these to the cash-needed figure for exactly this reason. A deposit that leaves nothing for the transfer tax does not buy a house.
Frequently asked questions
What is a good deposit for a mortgage?
Enough to cross the next loan-to-value band, which is a more useful target than a round percentage. Rates are priced in bands — commonly at 90, 80, 75 and 60 per cent — so a small extra amount that takes you from just above a threshold to just below it can lower the rate on the whole loan, while a much larger amount that does not cross one only reduces the balance. Twenty per cent is the most consequential single threshold, because it also removes mortgage insurance in the markets that use it.
What does LTV mean?
Loan to value: the loan expressed as a percentage of the property value. A 250,000 loan on a 300,000 property is an LTV of about 83 per cent. It is the main pricing lever a lender uses, because it measures how much of its money is at risk if prices fall, and it determines whether mortgage insurance applies. It is also the number that decides whether a fall in prices leaves you in negative equity.
Can I use a gifted deposit?
In most markets yes, provided it is genuinely a gift and not a loan. Lenders require a signed letter from the giver confirming that the money is a gift, that no repayment is expected, and that they retain no interest in the property; they will also verify the giver’s identity and the source of the funds. Get that letter early — it is a short document that routinely delays completions because nobody prepares it until the underwriter asks.
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