Mortgage Jargon A to Z: Plain English Guide 2026

Mortgage jargon is the set of terms lenders, solicitors and brokers use to describe your loan, its costs and the buying process. You do not need to know all of it, but a handful of terms decide what your mortgage really costs.

If you are buying your first home, the paperwork can feel like a different language. This A to Z explains the terms you will actually come across, in plain English, with links to our fuller guides where they help.

For the full buying process, start with our first-time buyer mortgage guide.

Which mortgage terms matter most?

Focus on the terms that change the cost. Loan-to-value decides which rates you can get. The rate type decides whether payments can move. Fees, early repayment charges and the standard variable rate decide what the deal costs over time. Get those five right and the rest is mostly process.

A to D

Agreement in Principle (AIP): a statement from a lender of how much it may lend you, before you apply in full. Also called a Decision in Principle or Mortgage in Principle. It usually lasts a few weeks to a few months, depending on the lender, and is not a guarantee. Some lenders use a soft credit search, others a hard one.

Annual Percentage Rate of Charge (APRC): the total cost of the mortgage over its full term shown as a yearly rate, including the interest rate and fees. It assumes you stay on the lender’s follow-on rate after your deal ends, which most people do not, so use it as a rough comparison only.

Arrangement fee: a fee the lender charges for the mortgage, also called a product fee. It ranges from nothing to £2,000 or more. You can often add it to the loan, but then you pay interest on it.

Bank Rate: the interest rate set by the Bank of England’s Monetary Policy Committee, often called the base rate. It is 3.75%, held on 17 September 2026, with the next decision due on 5 November 2026. The Bank of England explains how Bank Rate works. It sets the rate on tracker mortgages and affects how lenders price fixed rates.

Bridging loan: a short-term loan, usually for months rather than years, used to buy before you sell or to buy a property a mortgage lender will not accept yet. Rates are higher than a mortgage. See our bridging loan guide.

Broker fee: what a mortgage broker charges for advice and arranging the mortgage. At Option Finance the first consultation is free. Our broker fee is £499 in total: £299 on application and £200 when a mortgage offer is issued. The £299 is fully refundable if the application is declined.

Capital: the amount you borrowed, as opposed to the interest on it.

Chain: a line of linked sales and purchases where each one depends on the next. One delay can hold everyone up. First-time buyers are not selling, so they sit at the bottom of the chain.

Completion: the day the money moves, the property becomes yours and you get the keys. It usually follows exchange by a week or more, but can be the same day.

Conveyancer: the solicitor or licensed conveyancer who does the legal work, including searches, contracts and registering you as owner.

Credit file: the record credit reference agencies hold on how you have handled credit. Lenders look at the detail, not just a score. If yours has problems, see our adverse credit mortgage advice.

Deposit: the part of the price you pay yourself. A bigger deposit means a lower loan-to-value and usually a lower rate. See our guide to first-time buyer deposits.

Disbursements: costs your conveyancer pays on your behalf, such as searches and Land Registry fees, on top of their own fee.

E to H

Early repayment charge (ERC): a charge for repaying or switching your mortgage during the deal period, often a percentage of the balance. FCA rules say it must be a reasonable estimate of the lender’s costs, set out in MCOB 12.3. See our guide to remortgaging with an early repayment charge.

Equity: the part of your home you own outright. A £300,000 home with a £200,000 mortgage has £100,000 of equity.

Exchange of contracts: the point the purchase becomes legally binding. Pull out after exchange and you usually lose your deposit. The completion date is fixed at exchange.

Fixed rate: a rate that stays the same for a set period, often two or five years. Payments do not change during the deal, but there is usually an ERC if you leave early.

Freehold: you own the building and the land it stands on, with no end date. Most houses in England and Wales are freehold.

Gazumping: the seller accepts a higher offer after accepting yours, before exchange. It is legal in England and Wales because nothing is binding until exchange.

Gazundering: the buyer cuts their offer just before exchange.

Gifted deposit: money from a family member towards your deposit that does not have to be repaid. Lenders want a signed gift letter and proof of where the money came from. See our gifted deposit guide.

Ground rent: a yearly charge some leaseholders pay the freeholder. Most new residential leases since 2022 have a ground rent of zero, but older leases keep their terms.

Guarantor mortgage: a mortgage where a family member agrees to cover the payments if you cannot. See our guarantor mortgage guide.

I to L

Interest-only mortgage: you pay only the interest each month and repay the full loan at the end. Lenders want a credible repayment plan. It is common for buy-to-let, less so for homes.

Joint borrower sole proprietor (JBSP): a family member joins the mortgage to help with affordability but not the ownership. See our JBSP guide.

Joint mortgage: two or more people borrow together. Each of you is responsible for the whole debt, not just your share.

Land Registry: HM Land Registry records who owns land and property in England and Wales and any mortgages on it. You can search property records on GOV.UK.

Leasehold: you own the property for a set number of years under a lease, not the land. Most flats are leasehold. A short lease can make a property hard to mortgage. See our leasehold mortgage guide.

Loan-to-income (LTI): your loan divided by your income. Many lenders cap most loans at about 4.5 times income, with higher multiples for some buyers.

Loan-to-value (LTV): your loan as a percentage of the property’s value. A £240,000 loan on a £300,000 home is 80% LTV. Lower LTV usually means better rates.

M to P

Mortgage broker: an adviser who compares mortgages from a range of lenders and recommends one that suits you. Brokers must be authorised by the FCA or be an appointed representative of a firm that is.

Mortgage offer: the lender’s formal confirmation that it will lend, after underwriting and valuation. It is usually valid for three to six months.

Mortgage term: how long you take to repay the loan. 25 years is common, but 30 to 40 years is now normal for first-time buyers. A longer term lowers payments but costs more interest overall.

Negative equity: you owe more than the home is worth. It makes selling or remortgaging much harder.

New build: a newly built home sold for the first time. Lenders often cap the LTV lower on new build flats. See our new build mortgage guide.

Offset mortgage: your savings are linked to the mortgage, and you pay interest only on the difference. You earn no interest on the savings.

Overpayment: paying more than your monthly amount. Many deals allow up to 10% of the balance each year without an ERC. Check yours before you overpay.

Porting: taking your current deal to a new home. You still have to pass the lender’s checks again, and any extra borrowing is usually on a separate rate.

Product transfer: moving to a new deal with your existing lender instead of remortgaging elsewhere. See our guide to remortgaging or a product transfer.

R to T

Redemption: paying off your mortgage in full. A redemption statement shows exactly what you owe on a set date, including any ERC.

Remortgage: moving your mortgage to a new lender, usually when your deal ends. See our remortgage advice.

Repayment mortgage: each payment covers interest and some of the capital, so the loan is cleared by the end of the term. Also called capital and interest.

Retention: the lender holds back part of the loan until repairs found at valuation are done.

Shared ownership: you buy a share of a home and pay rent on the rest, usually to a housing association. See our shared ownership guide.

Stamp Duty Land Tax (SDLT): tax on buying property in England and Northern Ireland. First-time buyers pay 0% up to £300,000 and 5% from £300,001 to £500,000, with no relief above £500,000. See GOV.UK’s residential rates and our Stamp Duty guide.

Standard variable rate (SVR): the lender’s default rate after your deal ends. It is usually much higher than deal rates, which is why most people switch before their deal ends.

Stress test: the lender checks you could still afford payments if rates rose. Each lender sets its own test.

Survey: your own inspection of the property’s condition, separate from the lender’s valuation. A RICS Level 2 or Level 3 survey goes much further than a valuation.

Tracker mortgage: a rate set at a margin above Bank Rate. With Bank Rate at 3.75%, a tracker at Bank Rate plus 1% would charge 4.75%. It moves when Bank Rate moves.

U to Z

Underwriting: the lender’s full check of your income, spending, credit and the property before it makes an offer.

Valuation: the lender’s check that the property is worth enough to lend against. It is not a survey and does not protect you.

Variable rate: any rate that can change, including trackers, discounted rates and the SVR.

Yield: for buy-to-let, the yearly rent as a percentage of the property’s value. £12,000 rent on a £200,000 property is a 6% gross yield.

Frequently asked questions

Speak to Option Finance about your first mortgage

If the paperwork still feels like a foreign language, that is normal. We will tell you straight what each part of your offer means and what it will cost you.

Book a free initial consultation using the enquiry form below. See also our first-time buyer mortgage advice, our list of first-time buyer mistakes to avoid and our mortgage glossary.