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UK regulators are about to remove the per-lender high-LTI mortgage cap while keeping the market-wide one. The framing everywhere is “more flexibility for first-time buyers.” The part nobody has said out loud: the regulators have just created a finite, shared pool of lending headroom — and built no mechanism to ration it.

The problem: a fixed quota, individually unenforced

The Financial Policy Committee limits high loan-to-income mortgages — loans at or above 4.5 times income — to 15% of new residential lending. That has held since 2014. Until now the limit bit at the firm level: any lender wanting more than 15% of its own book at high LTI had to seek permission.

The April 2026 consultation (FCA CP26/12 / PRA CP6/26, closing 1 July 2026) removes the individual-firm constraint. Lenders will be “trusted” to run their own high-LTI strategies, with plans to wind back if asked. The 15% stays — but only as an aggregate.

That is a different kind of rule. A per-firm cap is a wall each lender hits alone. An aggregate-only cap is a common pool. Once it is shared, the binding constraint is no longer regulation. It is everyone else’s behaviour.

The analysis: how much room, and who eats it

The headroom is real but thin. The share of high-LTI lending reached 9.7% in 2025 Q1 and the Bank projected it rising toward 11% by year-end as rates fell — leaving roughly 4 percentage points to the 15% ceiling (BoE Financial Stability Report, July 2025). Four points across the whole market. That is the prize.

Now look at who wants it. First-time buyers already accounted for 54% of high-LTI lending volume in 2025 Q2 (same FSR). High LTI is overwhelmingly a first-buyer product, because deposits, not affordability stress tests, are the wall for most: the Bank found 78% of would-be first-time buyers lacked the savings for even a 5% deposit. The cohort the reform claims to help is the cohort already crowding the cap.

Then add demand-side pressure from the other live consultation. FCA CP26/18, published 9 June 2026 and closing 28 July, loosens affordability rules around interest-only, variable income, later-life and credit-impaired borrowers. More approved borrowers near the affordability frontier means more loans pressing on the same 4-point pool.

So the two reforms run in opposite directions on the binding constraint. CP26/18 raises the demand for high-LTI capacity. CP26/12 removes the only device that spread that capacity evenly across lenders. The aggregate stays fixed in the middle.

The land-grab nobody priced

Here is the part the coverage missed. Under the old per-firm cap, headroom was allocated by rule: every lender got the same 15% ceiling. Under an aggregate-only cap, headroom is allocated by speed.

A lender that leans into high-LTI lending early can run well above 15% of its own book — that is the entire point of the change — and in doing so consumes a disproportionate slice of the 4-point market pool. A cautious competitor that waits finds the headroom already spoken for. The reform rewards the first mover and penalises prudence. It quietly converts a stability tool into a race for share.

And the FPC has given itself no live throttle. The mechanism for pulling the market back below 15% is retrospective: firms must “have plans to reduce” if regulators ask. But aggregate flow data lags, and a quarterly monitoring regime — the consultation swaps the four-quarter rolling average for quarterly figures — sees a breach only after it has happened. There is no real-time meter, no queue, no per-firm allowance to trade. By the time the aggregate prints 15.5%, the lending is already on balance sheets and the affected borrowers already committed.

That creates two failure modes, both worse for the borrowers the policy targets. If lenders collectively front-run the cap, the FPC tightens — and the door slams precisely on the marginal first-time buyer, after a brief window of easy credit that mostly benefited whoever moved first. If lenders instead hold back for fear of being the one caught above target when the music stops, the headroom never gets used and the “flexibility” is theoretical. Either way the 4 points get allocated by timing and nerve, not by who needs the loan.

Implications

For lenders, the strategy question is no longer “what is our risk appetite” but “what is the market’s, and how fast.” High-LTI capacity has become a contested resource with no clearing price. Treasury and credit teams should model the aggregate path, not just their own book, because the constraint that bites will be the market’s collective draw on the pool — and the regulator’s reaction to it.

For the FPC, the gap is governance, not calibration. The 15% number is defensible. The absence of any per-firm allowance, real-time aggregate signal, or transferable headroom is the hole. A shared quota with no manager is a tragedy-of-the-commons design, and the commons here is first-time-buyer access.

For borrowers, the honest read is that “more flexibility” is real but rivalrous. The total amount of high-LTI credit the system will extend has not changed — it is still 15%. What has changed is that getting it now depends on which lender you approach, and when, relative to a ceiling none of them can see in real time.

The reform was sold as opening a door. It is closer to opening a single turnstile and removing the queue markings. Plenty of people will get through. The question the consultation does not answer is what happens at the moment it jams.

Finance & Markets Correspondent
Covers: Finance, capital markets, technology investing

David Whitmore covers the intersection of capital and code — the funding rounds, market structures and policy moves that shape how money flows through the technology economy.