Bridging Loans: How Short-Term Property Finance Works, What It Costs, and Where the Tax Bites

A bridging loan is short-term money that lets you act on a property before your long-term finance or a sale can catch up. It is fast, it is secured against property, and it is expensive by design, because you are paying for speed and for the lender to take on a situation a normal mortgage will not touch. Used well, a bridge buys an auction lot no term lender could complete on in time, makes an uninhabitable building mortgageable, or keeps a purchase alive when a sale is running late. Used badly, it is an expensive way to get into trouble.

This guide is written for property investors, developers and business owners, not for someone buying the home they will live in. That distinction is not a detail. A bridge secured on your own home is a regulated product with consumer protections and is outside the scope of everything below. What follows covers unregulated, business-purpose bridging: what it is, how it is charged, what it really costs once fees and rolled interest are counted, how much you can borrow, why the exit is everything, how fast it moves, where it goes wrong, and how the interest is treated for tax. It is education, not an offer of finance.

What a bridging loan actually is

Strip away the marketing and a bridging loan has four defining features. It is short-term, usually running from a few months to somewhere between 12 and 24 months. It is secured, with the lender taking a legal charge over one or more properties. It is interest-first, meaning you are not chipping away at the capital each month the way a repayment mortgage does; the whole loan is repaid in a single lump at the end. And it is purpose-driven and exit-driven, arranged to solve a specific timing problem and repaid from a specific, planned event.

That last point is what separates bridging from every other kind of property debt. A mortgage is underwritten on your ability to service it month after month for years. A bridge is underwritten on two things: the quality of the security, and the credibility of the exit that will repay it. There is no long tail of monthly payments to rely on, so the lender needs to see, at the outset, exactly how their money comes back. Sell the property. Refinance onto a term mortgage once it is lettable. Take out with development finance once planning lands. The exit is not an afterthought; it is half the loan.

Because the money is short-term and fast, it is priced in months, not years. Bridging rates are quoted as a monthly percentage, which is one of the most common sources of confusion for people new to the product. A rate that looks small next to a mortgage APR is being charged every month, and the fees stack up in a way term lending does not. We come back to true cost below, and in more depth on our dedicated bridging loan rates and cost guide.

Regulated versus unregulated bridging: the line that decides everything

Before anything else, you need to know which side of the regulatory line your loan sits on, because it changes what the product is, who can arrange it, and whether this guide even applies to you.

A bridging loan is a regulated mortgage contract when it is secured by a first legal charge on land, at least 40% of which is used, or intended to be used, as or in connection with a dwelling by the borrower or a close family member. That is the test set out in Article 61 of the Financial Services and Markets Act 2000 (Regulated Activities) Order 2001, and explained by the FCA in its perimeter guidance. In plain terms: if the loan is secured on the home you live in, or a home you intend to live in, it is regulated. Regulated bridging carries consumer protections, can only be arranged or advised on by an FCA-authorised firm, and falls under the FCA's mortgage rules (MCOB).

An unregulated bridge is secured against property held for investment or business purposes, that you do not and will not occupy: a buy-to-let, a commercial unit, a site you are developing, an HMO you are converting. Business-purpose lending of this kind sits outside the regulated-mortgage perimeter. This guide, and this whole finance section, covers unregulated, business-purpose bridging only.

If your situation involves your own home, stop here. A bridge to break a residential chain on the house you live in, a bridge secured on your main residence to release funds, a second charge behind your residential mortgage: these are regulated products, they are outside the scope of this guide, and you should speak to an FCA-authorised mortgage adviser who can advise on a regulated basis. We fence this off hardest on the investment chain-break page, which covers only the investment chain, never the residential one.

How a bridging loan works: charge, term, and how interest is paid

Three mechanical choices define any bridge: where the lender's charge sits, whether the term is open or closed, and how the interest is paid.

First charge versus second charge

The charge is the lender's legal security over the property. A first-charge bridge sits ahead of everyone else: if the property is sold or repossessed, this lender is paid first. A second-charge bridge sits behind an existing first-charge loan (for example, behind an existing mortgage on a property that already has one), so it is repaid only after the first-charge lender. Second charge is riskier for the lender, so it is priced higher and offered at lower LTV. Most investment bridging is first charge.

Open versus closed

A closed bridge has a fixed repayment date backed by a defined, evidenced exit, for example a sale that has already exchanged with a known completion date. A open bridge has an intended exit but no fixed date, such as "sell once refurbished" or "refinance when the works complete". Closed bridges are cheaper because the exit is certain; open bridges cost more and come at lower LTV because the lender is carrying exit uncertainty. The more you can turn an open exit into a closed one before you borrow, the better your terms.

Gross loan, net loan, and how interest is settled

This is the mechanic that catches people out. The gross loan is the headline facility, the number on the offer. The net loan is what actually lands in your account, because fees and, crucially, the interest are often deducted from the gross at the start. Interest on a bridge is settled in one of three ways:

• Serviced: you pay the interest monthly out of your own cash flow, like an interest-only mortgage. The full gross loan (less fees) is advanced to you, but you need income to cover the payments.
• Retained: the lender calculates the interest for the whole term up front and holds it back from the advance. You borrow it but never see it; it covers your interest so you make no monthly payments. This shrinks the net loan.
• Rolled up: interest accrues (often compounding month on month) and is added to the balance, then repaid in full at the end from your exit. No monthly payments, but the debt grows every month.

Retained and rolled interest are why the cash you receive is less than the loan you signed for. If you do not model the net figure, you can find yourself short of the money you thought you were borrowing. The worked example below shows exactly how that gap opens up.

What a bridging loan really costs

The monthly rate is only the start. The true cost of a bridge is the rate plus the fee stack plus the effect of rolled or retained interest on how much you actually receive. As at July 2026, first-charge investment bridging monthly rates commonly sit in a band of roughly 0.55% to 1% a month, with an arrangement fee of around 1% to 2% of the loan, plus valuation, legal costs (yours and the lender's) and sometimes an exit fee. These are ranges, not quotes: pricing moves with the Bank of England base rate and is specific to the deal, the security and the borrower, so always verify current pricing with a lender or broker before you rely on a number.

What drives where you land in that band? Five things above all: the loan to value (higher LTV, higher rate), the charge (second charge costs more than first), the quality of the security (a standard house prices better than bare land or an unusual commercial unit), the strength of the exit (a closed, evidenced exit beats an open one), and the borrower's experience (a developer with a track record prices better than a first-timer).

Worked example: a £250,000 first-charge investment bridge, interest rolled for nine months

Take an investor drawing a £250,000 gross first-charge bridge against an investment property, at 0.75% a month (mid-band, as at July 2026 and for illustration only), with interest rolled up over a nine-month term. Here is how the gross facility turns into the cash that actually reaches the account:

Item	Amount	Note
Gross loan (the facility)	£250,000	The headline number on the offer
Arrangement fee (2%)	minus £5,000	Deducted from the advance
Rolled interest, 9 months at 0.75%	minus £16,875	0.75% × £250,000 × 9, held back at the start
Valuation and legal costs (illustrative)	minus £2,000	Varies by asset and lender
Net advance you receive	£226,125	What actually lands in your account

The lesson is in the last two rows. You signed for £250,000, but roughly £24,000 of that never reaches you, because the fees and nine months of interest are taken from the top. At the end of the term you still repay the full £250,000 gross (the rolled interest and fees having been built into it) from your exit. If you needed £250,000 of usable funds for the deal, you have under-borrowed by £24,000, and you would need to gross the facility up to around £276,000 to net £250,000 in hand. This is the single most important number to model before you commit, and it is why "how much do I actually receive" matters more than the headline rate. Our bridging loan calculator runs the gross-to-net maths for your own figures, and the rates and cost guide breaks down every line in the fee stack.

How much you can borrow: LTV and the valuation that decides it

Bridging is sized by loan to value: the loan as a percentage of the lender's valuation of the security. Most first-charge investment bridges are offered up to around 70% to 75% LTV (verify at the time, as appetite varies by lender and asset). Two points matter more than the headline percentage.

First, LTV is measured against the lender's valuation, not the price you agreed to pay, and where the two differ lenders usually work off the lower of the two for the first six months of ownership. That matters enormously if you are buying below market value: lending against the true open-market value rather than the discounted price is possible with the right lender, but it is the exception, not the rule, and it comes with anti-fraud scrutiny. That specific mechanic is covered on the below-market-value page.

Second, the security type moves the ceiling hard. A standard, mortgageable house supports a higher LTV than bare land (which produces no income and may have no planning), an uninhabitable property, or an unusual commercial unit valued on a vacant-possession basis. You can lift your effective borrowing by offering additional security (a second property the lender also charges), which spreads the risk and lowers the LTV against any single asset, sometimes allowing what looks like 100% of a purchase price to be funded across two properties. That is a structuring point, not a free lunch: you are putting more of your assets on the line.

The exit is everything

If you take one thing from this guide, take this: a bridge is only as good as its exit. Because the whole balance falls due in one lump at the end of a short term, the lender is not relying on years of monthly payments to get their money back. They are relying on a single event, and they will underwrite that event as hard as they underwrite the property.

There are three exits that account for almost every bridge:

• Sale. You sell the property (or the finished units, for a developer) and repay from the proceeds. The lender will test whether your expected sale price and timescale are realistic against the current market, not an optimistic one.
• Refinance. You refinance onto a longer-term mortgage once the property qualifies for one, for example a buy-to-let mortgage after a refurbishment has made an uninhabitable property lettable. The bridge is repaid from the new mortgage advance. The lender will want to believe that term finance will genuinely be available on the numbers you are quoting.
• Development take-out. For a site acquisition, the exit may be a development finance facility that funds the build, or a development exit bridge once the scheme completes.

The reason exit strength dominates pricing is that a strong asset with a weak exit is still a bad loan. A vague "I'll sell it or maybe refinance" is an open bridge and prices like one. A signed sale with an exchange date, or a term mortgage offer already in hand, is a closed bridge and prices better. Turning your exit from a hope into an evidenced plan is the highest-value thing you can do before you borrow.

What investors and developers use bridging for

Bridging solves a family of related problems, all variations on "I need to act now and my normal finance cannot move fast enough or will not touch this asset yet". Each use case has its own risk profile, its own LTV treatment and its own exit, and each is covered in depth on its own page:

• Auction purchases: the 28-day completion clock that only a bridge can hit, where missing the deadline forfeits your deposit.
• Refurbishment and BRRR: light versus heavy works, staged drawdowns against a schedule, and the buy-refurbish-rent-refinance loop.
• Bridge-to-let: making an unmortgageable property lettable, then refinancing the bridge onto a term buy-to-let mortgage.
• HMO conversions: Article 4 planning, mandatory licensing, and an exit onto a specialist HMO mortgage.
• Commercial property: vacant-possession versus investment valuation and the tenant covenant that drives the loan.
• Land purchase: the planning-risk haircut on land with no consent and rolled interest because land produces no rent.
• Below-market-value purchases: lending against true open-market value rather than the discounted price, and the anti-fraud checks that come with it.
• Investment chain breaks: keeping a portfolio purchase alive when a sale runs late. Investment chains only; the own-home chain is regulated and out of scope.

Timescales: why bridging completes in days, not months

Speed is the product. A well-prepared bridge can complete in a week or two, and experienced lenders can move faster when the valuation and the legal title are clean. A term mortgage, by contrast, typically takes several weeks to a few months. That gap is the whole reason bridging exists in situations with a hard deadline.

Three things govern how fast you actually complete: the valuation turnaround (physical valuations take longer than desktop or automated ones, and unusual assets take longest), the quality of the legal title (clean, registered title with no ransom strips or access issues completes quickly; messy title drags), and how fast you provide information. You cannot control the first two entirely, but you can prepare: have your identity documents, proof of deposit, company structure and exit evidence ready before you start, and use a solicitor who knows bridging. Auction buyers should read the legal pack and arrange finance in principle before the hammer falls, because the 28-day clock starts on exchange, not on the day you get organised.

The risks: where bridging goes wrong

Bridging is a sharp tool. Used with a clear exit and honest numbers, it is one of the most useful instruments in property finance. Used without them, it fails in predictable ways. Know these before you borrow:

• Exit failure. The number-one cause of trouble. If your sale falls through or your refinance is declined, the loan still falls due. Always stress-test the exit against a slower market and a lower valuation than you hope for.
• Rolled interest compounding. Rolled-up interest grows the balance every month. On a longer term, or after an extension, the debt can be materially larger than you first pictured. Model the balance at the end of the term, not the start.
• Default interest. Miss the repayment date and most facilities switch to a higher default rate, which compounds fast. A short overrun can cost far more than the original margin.
• Personal guarantees. Investment and development bridges to companies almost always come with personal guarantees from the directors, so a company default can reach your personal assets.
• Under-borrowing on the net loan. As the worked example showed, fees and retained or rolled interest shrink the cash you receive. Size the gross loan so the net figure covers what the deal actually needs.

None of these are reasons to avoid bridging. They are reasons to go in with a closed exit, a modelled net figure, and a plan for what happens if the market slows. The cost of a bridge is bearable when the exit is real; it becomes punishing only when the exit is not.

The tax angle in brief

The interest on a bridge is a cost, and how much of it you can relieve against tax changes the real, after-tax price of the loan. The treatment turns on two things: the purpose of the borrowing and the vehicle that holds the property. This is genuinely part of the sum, not an afterthought, because a loan whose interest is fully deductible costs materially less in real terms than one whose relief is restricted.

In outline: where a bridge funds a property rental business held by an individual, and the property is residential, the Section 24 finance-cost restriction applies. Individual residential landlords no longer deduct finance costs in full; instead relief is given as a basic-rate (20%) tax reducer under ITTOIA 2005. Our finance costs and Section 24 guide sets out exactly how that restriction works and who it catches. Where the bridge funds a development trade, or is held in a company, the position is different: trading interest is generally deductible against trading profit, and companies relieve finance costs under the loan relationship rules rather than facing Section 24. Arrangement fees and other incidental costs of raising the finance can often be relieved too.

Because the answer depends so heavily on your facts (individual or company, residential or commercial, investment or trade, and whether the purpose is genuinely business), it deserves a page of its own. Our guide to whether bridging loan interest is tax deductible works through each case with the relevant HMRC manuals. If you want the trading-versus-investment line drawn for your own project, our note on whether you are a property investor or a developer is the place to start, because that classification decides how the whole thing is taxed.

Bridging versus a mortgage versus development finance

Bridging is one of three main ways to fund property, and the commonest mistake is reaching for the wrong one. Here is how they differ:

	Bridging loan	Term mortgage	Development finance
Purpose	Short-term timing gap, speed, or an asset a mortgage will not touch yet	Long-term hold of an income-producing property	Funding land plus a build programme
Term	Months to ~24 months	Years to decades	Length of the build (often 12 to 24 months)
Repayment	One lump at the end, from the exit	Monthly, amortising or interest-only	Repaid on sale or refinance at completion
Priced	Monthly rate plus heavy fees	Annual rate, lighter fees	Margin plus fees, drawn in stages
Underwritten on	Security plus the exit	Your ability to service it long-term	The finished scheme (GDV) and your track record
Speed	Days to a couple of weeks	Weeks to months	Weeks, then staged over the build

The rule of thumb: if a mortgage can do the job in the time available and the property already qualifies for one, use a mortgage, because it is far cheaper. Reach for a bridge only when speed, a deadline, or the condition of the asset rules a mortgage out. And if you are funding a ground-up build or a heavy conversion, that is development finance, not bridging, because the money needs to be drawn in stages against the build. For the longer-term routes, see our commercial mortgages guide and development finance guide. When it comes to choosing an actual facility, our note on the types of bridging lender explains the market structure without recommending anyone.

Bridging done well is disciplined: a real deadline or a genuine timing gap, a modelled net loan, a closed and evidenced exit, and eyes open on the tax treatment of the interest before you commit. Get those four right and it is a precise, powerful tool. Get the exit wrong and it is the most expensive way to learn a lesson in property.

Sources and further reading: FSMA 2000 section 21 (restriction on financial promotion); RAO 2001 Article 61 (regulated mortgage contract); FCA PERG 4 (regulated mortgage activities and the dwelling-use test); FCA PERG 8 (financial promotions); Bridging & Development Lenders Association; Bridging Trends market data (verify current figures at time of reading); Bank of England Bank Rate. Rate ranges stated as at July 2026 and indicative only; verify current pricing with a lender or broker. This guide is educational and does not constitute financial or tax advice.