Borrowing Power: Income, Deposit and the LTV Bands

Two ceilings, and the lower one is your answer

The savings balance is open on one phone and the broker appointment is in the calendar on the other. Forty thousand saved over four years, two payslips, and a car loan with eleven payments left on it. What most people do at this point is find a house they like on a property portal and work backwards from its asking price, which is how a Thursday morning ends with a borrowing figure that originated in an estate agent's window rather than in anything the household actually earns or holds.

There are only two ceilings and they are set by different arithmetic. Income decides the largest loan a lender is willing to write against your ability to keep making the payments. The deposit decides the largest price that loan can reach, and — separately, and this is the part that gets missed — which pricing band the loan sits in on the day it is written. The two move for unrelated reasons, and on a first purchase they are usually nowhere near each other.

Finding out which one binds takes about ten minutes and it changes what you do for the next year. If income is the constraint, saving harder buys a better rate and very little extra house. If the deposit is the constraint, another few thousand can move you a whole band and take the monthly payment down with it. Getting the two the wrong way round is how people spend eighteen months saving toward a threshold that was never the thing stopping them.

The income ceiling moves for reasons that have nothing to do with a pay rise

Take the household above at a gross income of 75,000, other debt payments of 400 a month, a 43% screening ratio, 5% and twenty-five years. The arithmetic supports a loan of about 391,300. Delete the 400 a month and the same income supports about 459,700. That car loan is costing 68,400 of borrowing capacity, which on most car finance is several times the outstanding balance — and it is the single highest-yield hour available to anyone in the months before an application. Two conditions attach. The commitment has to be settled and closed rather than merely reduced, because it is the monthly payment on the credit file that consumes the allowance. And the cash to close it comes out of the deposit, which is the other ceiling, so the two moves have to be weighed against each other rather than made in sequence.

The rate is the other lever, and it moves the ceiling further than people expect. The same household at 7% supports about 323,700, and at 8% — five plus the three-point Australian buffer — about 296,400, a quarter less than the headline figure. That is not a pessimistic scenario, it is the number a regulator has decided a lender must satisfy itself about before writing the loan. Term does the reverse and does it dishonestly: stretching twenty-five years to thirty lifts the supported loan to roughly 426,100, about 35,000 more house, and adds something like 100,000 of interest across the life of the loan to buy it. Both figures come out of the same monthly payment. Only one of them is visible at the kitchen table.

Then there is the cross-check that catches British readers out, because a debt-to-income screen does not know the loan-to-income limit exists. A loan of 391,300 against a gross income of 75,000 is 5.2 times income, and lending at 4.5 and above is a rationed share of any UK lender's new business under the FPC Recommendation. Four and a half times this income is 337,500 — some fifty thousand below what the ratio arithmetic offered. Both numbers are correct; they are answers to different questions, and the smaller one is the one a UK lender is more likely to be able to write.

1. Write down gross household income the way an underwriter would count it: base pay in full, and bonus, commission or self-employed profit averaged or discounted the way your lender does it — a question worth asking before you apply, not after.
2. List every credit commitment that will show on a credit file, at its monthly payment rather than its balance. Revolving card debt counts at the minimum payment; the balance matters only to how long it lasts.
3. Run the affordability arithmetic at the quoted rate, then again three points higher. Plan around the second figure and treat the first as the best case.
4. Divide the result by gross annual income. Above 4.5 in the UK you are in the rationed part of the market, and a lender's own answer may be lower for that reason alone rather than anything about you.
5. Re-run it with each clearable debt removed one at a time, so each one is priced in borrowing capacity rather than in monthly payments. That is the only view in which a small loan looks as expensive as it actually is.
6. Only then decide whether the next few thousand should clear a debt or sit in the deposit. It cannot do both, and the two ceilings respond to it differently.

Where the bands sit, and who charges you for being above them

Loan-to-value is the loan divided by the lower of purchase price and lender's valuation, and 80% is very close to a universal line across markets. What happens at that line, though, is different in every one of them, and the difference matters because it decides whether being at 85% costs you a premium, a worse rate, or nothing at all.

In the United States, conventional lending above 80% normally carries private mortgage insurance, and the Homeowners Protection Act of 1998 at 12 U.S.C. 4901 and following gives the borrower rights to end it: a right to request cancellation when the balance reaches 80% of the original value, automatic termination when it reaches 78% on the original amortisation schedule, and a final termination at the midpoint of the loan term, each subject to conditions including payment history. Read the phrase original value carefully — it is the value at origination, not today's, so a rising market does not cancel anything by itself. FHA lending is a separate regime under HUD Handbook 4000.1, with a minimum required investment of 3.5% for borrowers at or above a 580 credit score and 10% below that, and its mortgage insurance premium is a different product that does not cancel under the HPA at all: on a thirty-year FHA loan the annual premium runs for eleven years where the initial loan-to-value is 90% or less and for the life of the loan above that.

In Canada, insurance is not a pricing choice: below 20% down it is mandatory, and the minimum down payment itself is a sliding scale — 5% of the first 500,000 dollars, 10% of the portion between 500,000 and 1,500,000, and 20% at or above 1,500,000, where insurance is not available. The 1.5 million ceiling replaced the previous one million threshold on 15 December 2024, and it moved a large number of urban purchases from impossible-to-insure into insurable. Insured lending also drags in the CMHC service ratios, so the borrowing ceiling and the deposit ceiling stop being independent at that point.

In Australia, lenders mortgage insurance applies above 80% loan-to-value, is paid by the borrower and insures the lender rather than the borrower, and can usually be capitalised into the loan. Capitalising it is worth thinking about for one arithmetic reason: it increases the loan, which increases the LVR, which is the ratio the premium was priced against in the first place.

The United Kingdom has no ordinary borrower-paid mortgage insurance and expresses the same information entirely in the rate. Lenders publish product ranges in bands — commonly 95, 90, 85, 80, 75 and 60 per cent — and each step down opens a different set of products. How much a step is worth is a per-lender, per-week commercial question and there is no honest national table for it, which is why this site publishes the thresholds and not the prices. What you can know precisely, and today, is where your loan sits relative to the next line down.

The cash that never becomes deposit

The deposit is not the cash requirement, and the difference is routinely five figures. Transfer tax comes first and is the largest of them. On the Stamp Duty Land Tax rates effective from 1 April 2025 in England and Northern Ireland, a 431,300 purchase costs a standard buyer 11,565 and a first-time buyer 6,565, because first-time buyers' relief lifts the nil-rate band to 300,000 and charges 5% from there. Notice what that means: between 300,000 and 500,000 the relief is worth exactly 5,000 at every price, no more and no less.

Above 500,000 it is worth nothing, and not by taper. At 500,000 a first-time buyer pays 10,000; at 500,001 the relief is withdrawn in full and the bill is 15,000. One pound of agreed price costs 5,000 of tax, and that 5,000 comes out of the same account as the deposit, so it moves the loan-to-value as well as the bank balance. It is the one place in a first purchase where haggling over a thousand pounds of price is unambiguously worth the awkwardness. Scotland and Wales are separate taxes with separate thresholds and separate first-time buyer treatment — Land and Buildings Transaction Tax administered by Revenue Scotland, Land Transaction Tax by the Welsh Revenue Authority — and applying the English table to either produces a wrong number. In Ontario, provincial land transfer tax under the Land Transfer Tax Act carries a first-time buyer refund capped at 4,000 dollars, and a purchase inside the City of Toronto attracts a municipal land transfer tax on top of it.

Then the rest, none of it lendable: the lender's valuation, and a survey if you want one, which is a different instrument for a different purpose — the valuation protects the lender's security and tells you almost nothing about the roof. Conveyancing and searches. A lender arrangement or product fee. A broker fee where one applies. Buildings insurance, which is normally required from exchange rather than from completion. And the removal van, which is nobody's favourite line and is always more than the quote. Put them on the page before you decide the deposit figure, because every one of them is a subtraction from it.

Where the deposit came from is itself an assessment. Under the Money Laundering, Terrorist Financing and Transfer of Funds (Information on the Payer) Regulations 2017 your conveyancer and your lender will evidence the source of funds, and a gifted deposit needs a letter from the donor confirming it is a gift rather than a loan and that they retain no interest in the property. A six-month savings history is easy to produce in advance and unpleasant to assemble under exchange-week pressure. And if part of the deposit sits in a Lifetime ISA, note that its property price cap and the first-time buyer stamp duty threshold are two different numbers set by two different rules and revised on two different timetables — check both as they stand on the day, rather than assuming one line does for both.

Reading the two ceilings back as one price

The reconciliation is one line, and the order the operations come in is the whole of it. Take the savings balance, subtract every pound of cash committed to tax and fees before completion, and call what is left the deposit. The price you can pay is that deposit plus the smaller of two loans: the one income supports at a stressed rate, and the one the deposit supports at the band you are aiming at — which is the deposit multiplied by the band and divided by one minus it. Do the subtraction first, not last: fees taken off at the end are what push a carefully assembled 80% into 80.4%, and by then the band is gone and the money is spent.

Then read the ratio the answer implies and look at how far it is from the nearest line below. If the gap is a few thousand, that is a decision about timing and it is worth making deliberately — three more months of saving against a market that may or may not wait. If the gap is thirty thousand, it is not a decision, it is information, and the right response is to plan around the band you are actually in rather than around the one you had hoped for.

1. Fix the income ceiling first, at a stressed rate rather than a quoted one, and divide it by income to check where it sits against a loan-to-income limit if one applies where you are.
2. Subtract from the savings balance every non-lendable cost you can name — transfer tax at the price you have in mind, legal fees, valuation, lender fee, removals. What is left is the deposit; what you started with was not.
3. Compute the price as deposit plus the smaller loan, then read the loan-to-value it produces and find the distance to the next band down.
4. Decide the fee question explicitly: paid in cash and outside the deposit, or added to the loan and inside the ratio. Not both, and not by default.
5. Take the same two figures — the income ceiling and the ratio — into the appointment, so that when the lender's number differs you can ask which of the two assumptions moved rather than accepting the difference.

What an agreement in principle is worth, and what it is not

It is a lender's statement, on the strength of numbers you typed yourself, that a loan of roughly that size looks writable to them. It is not an offer, it is not binding, and it expires. Before you consent, ask whether the check is a soft or a hard credit search — several hard searches in a short window are visible on the file and are read as shopping under pressure rather than shopping carefully.

Underwriting is where the figure moves, and it usually moves down for three reasons. Variable income gets averaged or discounted rather than taken at last year's peak. The credit file surfaces a commitment nobody remembered, most often an interest-free retail agreement that was never thought of as debt. And the valuation lands. That last one is the one that hurts, because loan-to-value is measured against the lower of price and valuation: a 431,300 purchase surveyed at 415,000 with the 345,040 loan you arranged is 83.1%, not the 80% you paid 46,260 to reach, and the difference is met in cash or by reopening the price with the seller. It is the most common late failure in a first purchase and there is no arithmetic that prevents it — only a deposit with a little slack in it.

One last thing to test before you treat the ceiling as affordable rather than merely achievable. The payment you are agreeing to is the payment for the fixed period, and the loan reverts afterwards to whatever the lender's variable rate then is. Work the payment twice, once at the fixed rate and once at a realistic reversion applied to the balance that will actually be outstanding at that point, and ask the question about the second number. A borrowing ceiling that only survives at the introductory rate is not a ceiling, it is a countdown.