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Mortgage jargon in plain English. What it means, who it suits and what to watch out for — checked against the rules as they stand today.

From a qualified mortgage broker in Sleaford, Lincolnshire — helping people across England and Wales.

12 answerson this page
Oct 2026checked against today's rules
QualifiedCeMAP & CeRER adviser reviewed

The answers

01Mortgage basicsWhat is a joint borrower sole proprietor (JBSP) mortgage?Someone else, usually a parent, adds their income to your mortgage so you can borrow more, but only you own the home. You both owe the mortgage, and only you are on the deeds.Read the full answer

Updated October 2026 · Reviewed by John Williams, CeMAP CeRER

How it works

  • You own the home and live in it.
  • They are named on the mortgage and share legal responsibility for the repayments.
  • They don't own any part of the property and aren't on the title.

Why people use it

  • To borrow enough to buy when your income alone falls a little short.
  • A parent who already owns a home can help without becoming an owner of a second property. That avoids the 5% stamp duty surcharge that would apply if they went on the deeds.
  • You may still get first-time buyer stamp duty relief, because only the people on the deeds count.
  • It's an alternative to a gifted deposit when there isn't spare cash to give.

Things to think about

  • It's a real commitment. If you can't pay, the lender can ask your family member to, and it can affect their own borrowing.
  • Age matters. Lenders often set the term by the oldest borrower's age, and some lenders accept up to four borrowers.
  • Independent legal advice is usually required for the person helping.
  • Fewer lenders offer it, so the right lender makes a big difference.
If you only remember one thing

Have the money conversation early: who pays what, and what happens if things change. It's far easier at the start.

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02PropertyWhat's the difference between joint tenants and tenants in common?As joint tenants you own the whole home together, and it passes automatically to the other owner if one of you dies. As tenants in common you each own a share, which you can leave to anyone in your will.Read the full answer

Updated October 2026 · Reviewed by John Williams, CeMAP CeRER · England & Wales

Joint tenantsTenants in common
Who owns whatYou both own it allYou each own a share
SharesAlways equalCan be unequal, e.g. 70/30
If one of you diesPasses to the otherGoes as your will says

Joint tenants usually suits

  • Married couples or civil partners who want everything to go to each other.
  • Couples who've put in roughly the same.

Tenants in common usually suits

  • Buyers putting in different amounts.
  • Blended families, where you may want your share to go to your children.
  • Friends or relatives buying together.

Can we change it later?

Yes. Joint tenants can switch to tenants in common by "severing" the joint tenancy, and you can go the other way too. Your conveyancer can handle it.

Property ownership works differently in Scotland. This is general information, not legal advice.

If you only remember one thing

Tenants in common? Put a declaration of trust in place and make sure you both have a will.

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03Mortgage basicsWhat's the difference between fixed, tracker and variable rates?A fixed rate stays the same for a set period. A tracker moves with the Bank of England base rate, which was held at 3.75% in September 2026. A variable or standard variable rate (SVR) can be changed by your lender at any time.Read the full answer

Updated October 2026 · Reviewed by John Williams, CeMAP CeRER

TypePaymentsSuits
Fixed (2, 3, 5 or 10 years)Same every monthBudgeters who want certainty
TrackerMove with base ratePeople who can ride out a rise
DiscountA set amount below the SVRShort-term flexibility
Standard variable (SVR)Lender decidesUsually nobody — it's what you fall onto
OffsetSavings reduce the interestPeople with healthy savings balances

Where are rates now?

The Bank of England held base rate at 3.75% on 17 September 2026, with three of the nine committee members voting for a rise. The next decision is due on 5 November 2026. Fixed rates are priced on what markets expect next, so they can move before base rate does.

The small print that matters

  • Early repayment charges — most fixes and some trackers charge you for leaving early.
  • Overpayments — usually up to 10% a year without a penalty.
  • Fees — a low rate with a £1,500 fee can cost more than a higher rate with no fee. Compare the total cost.
  • Collars — some trackers won't fall below a set rate.
If you only remember one thing

Don't pick a rate. Pick the total cost over the deal, and how long you need certainty for.

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04Mortgage basicsWhat is a decision (or agreement) in principle?A lender's written estimate of how much it would lend you, based on a quick check of your income and credit. It isn't a guaranteed offer, but it tells you your budget and shows estate agents you're serious.Read the full answer

Updated October 2026 · Reviewed by John Williams, CeMAP CeRER

What it involves

  • Basic details: income, outgoings, address history and the deposit you have.
  • A credit search — many lenders now use a soft search that other lenders can't see. Some use a hard search, which is why we choose carefully.
  • It takes minutes, and is usually valid for 30 to 90 days.

What it isn't

It isn't a mortgage offer. The lender still needs your full application, documents and a valuation of the property. That's why getting the DIP from a lender that actually suits you matters — a DIP from the wrong lender can fall over later.

Mortgage in principle, agreement in principle, decision in principle

They're all the same thing. Lenders just call it different names.

If you only remember one thing

Get your DIP before you view. Agents ask for it, and it stops you falling for homes you can't buy.

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05SchemesWhat is shared ownership?You buy a share of a home, usually between 10% and 75%, with a mortgage, and pay rent to a housing association on the rest. You can buy more shares later. Household income must be £80,000 or less (£90,000 in London).Read the full answer

Updated October 2026 · Reviewed by John Williams, CeMAP CeRER

Who can apply

  • Household income of £80,000 or less, or £90,000 or less in London.
  • You can't afford to buy a suitable home outright, and you're a first-time buyer, a former owner, forming a new household, an existing shared owner, or an owner who can't afford a suitable move.
  • Some homes need a local connection.

New model vs older homes

Newer homes (2021 model)Older homes
Minimum first share10%Usually 25%
Buying moreFrom 1% a year for 15 years, or 5%+ at a timeUsually 10%+ at a time
Repairs helpUp to £500 a year for the first 10 yearsUsually none
Lease990 yearsOften 99–125 years

Costs to budget for

  • Mortgage on your share — the deposit is usually 5–10% of the share, not of the whole home.
  • Rent on the share you don't own. It usually rises every year.
  • Service charges and ground rent — all shared ownership homes are leasehold.

Over 55?

Older Persons Shared Ownership lets you buy up to 75%, with no rent to pay on the rest.

If you only remember one thing

Look at the rent and service charge as hard as the mortgage. Together, they're your real monthly cost.

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06PropertyWhat should I know about buying a new build?New builds come with a 10-year warranty and often incentives, but lenders can be stricter on deposits and valuations. Offers often need to last longer while the home is finished, and the price may not match what it's worth once you move in.Read the full answer

Updated October 2026 · Reviewed by John Williams, CeMAP CeRER

The good bits

  • A 10-year structural warranty (NHBC, Premier Guarantee, LABC and others).
  • Energy efficient, which means lower bills, and some lenders offer "green" rates.
  • No chain below you.
  • Most developers sign up to a consumer code, and many now follow the New Homes Quality Code.
  • Ground rents on new leases were banned in 2022.

Watch out for

  • Valuations — the lender values the home on the open market, which can be below the asking price.
  • Incentives — anything the builder gives you (cashback, carpets, paid fees) has to be declared to the lender, and it can reduce the value it lends against.
  • Deposits — some lenders want more for new-build flats. 95% mortgages are available on many new builds through the Freedom to Buy scheme.
  • Deadlines — developers often want exchange within 28 days of reservation.
  • Offer expiry — if the build runs late, your mortgage offer can expire. Many lenders give new builds six months or more, and extensions are possible.
  • Snagging — book an independent snagging survey before completion if you can.

Help to Buy has closed to new buyers. If you already have a Help to Buy equity loan, see remortgaging and paying it off.

If you only remember one thing

Talk to us before you pay a reservation fee. That 28-day exchange clock starts fast.

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07Mortgage basicsWhat is a bridging loan?A short-term loan secured on property, usually for up to 12 to 24 months, used to "bridge" a gap: buying before you sell, buying at auction or doing up a property that isn't mortgageable yet. You need a clear plan to repay it.Read the full answer

Updated October 2026 · Reviewed by John Williams, CeMAP CeRER

Common uses

  • Buying your next home before your current one sells (a chain break).
  • Auction purchases that must complete in around 28 days.
  • Properties without a working kitchen or bathroom, which most mortgage lenders won't touch.
  • Refurbishment projects before refinancing or selling.

Regulated or unregulated?

RegulatedUnregulated
Used forA home you or your family live in or will live inInvestment and business property
Maximum term12 monthsOften up to 24 months
FCA protectionYesLimited

How it's charged

  • Interest is quoted monthly, not yearly. It's often rolled up or retained, so you don't pay monthly.
  • Expect arrangement fees, valuation and legal costs, and sometimes an exit fee.
  • The longer it runs, the more it costs, so speed matters.

The exit is everything

The lender will want to know how you'll repay: the sale of a property, a remortgage once works are done, or another funding source. If the plan slips, costs build quickly.

If you only remember one thing

Never take a bridge without a plan B for getting out of it.

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08Work & incomeWhat is a CIS worker, and can I get a mortgage?Under the Construction Industry Scheme, contractors deduct tax from subcontractors' pay: 20% if you're registered, 30% if not, and nothing if you have gross payment status. Many lenders will use your CIS statements like payslips.Read the full answer

Updated October 2026 · Reviewed by John Williams, CeMAP CeRER

How lenders treat CIS income

ApproachWhat they look at
Like an employeeRecent CIS statements and bank statements, using your gross pay
Like self-employedSA302s and tax year overviews, using your net profit

Lenders that use your gross CIS pay can lend considerably more than ones that only look at profit after expenses. Picking the right lender matters.

What you'll usually need

  • CIS statements (pay and deduction statements) for the last 3–12 months.
  • Bank statements showing the pay going in.
  • Often 12 months' continuous work in the industry, and sometimes a tax return.

What changed in April 2026

New CIS rules mainly affect contractors: tighter checks on subcontractors, tougher penalties for fraud, and gross payment status that can be removed immediately (with a five-year wait to reapply). If you hold gross status, keep your compliance spotless.

If you only remember one thing

Keep every monthly CIS statement. To a lender, they are your payslips.

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09Work & incomeWhat is IR35, and what are umbrella companies?IR35 decides whether a contractor is taxed like an employee. Medium and large clients make that call. Umbrella companies employ contractors and run their PAYE, and since April 2026 agencies can be held liable if an umbrella gets the tax wrong.Read the full answer

Updated October 2026 · Reviewed by John Williams, CeMAP CeRER

Inside or outside IR35?

Inside IR35Outside IR35
TaxPAYE and NI on your feeThrough your own limited company
Who decidesThe client (if medium or large)The client (if medium or large)
Typical setupUmbrella company or agency payrollLimited company

Umbrella companies

An umbrella company employs you, invoices the agency, and pays you through PAYE. From April 2026, the agency (or the client, if there's no agency) is responsible for the umbrella's PAYE. That's meant to stamp out tax-avoidance schemes, so check your payslips add up.

Getting a mortgage as a contractor

  • Some lenders work out income from your day rate — e.g. day rate × 5 days × 46–48 weeks — rather than your company accounts.
  • Usually 6–12 months' contracting history, or a track record in the same line of work.
  • A current contract, often with time left to run or a history of renewals.
  • Umbrella workers: payslips, and sometimes the contract.
If you only remember one thing

A day-rate lender can make a big difference to what you can borrow. Don't accept a figure based only on your company accounts.

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10Later lifeWhat is equity release?A way for homeowners aged 55 or over to take tax-free money from their home without moving. The most common type is a lifetime mortgage: the interest usually rolls up and the loan is repaid when you die or go into long-term care.Read the full answer

Updated October 2026 · Reviewed by John Williams, CeMAP CeRER

The two types

Lifetime mortgageHome reversion
Minimum age55Usually 60–65
OwnershipYou keep 100%You sell a share
CostInterest, usually rolled upYou get below market value for the share

Protections to insist on

Plans that meet Equity Release Council standards include:

  • A no-negative-equity guarantee — you'll never owe more than your home is worth.
  • The right to live in your home for life.
  • The right to move to a suitable home and take the plan with you.
  • The right to make penalty-free partial repayments, within limits.

Think carefully about

  • Rolled-up interest compounds, so the debt can grow quickly.
  • It reduces what you can leave as an inheritance.
  • It can affect means-tested benefits.
  • The alternatives: downsizing, a retirement interest-only mortgage, or family help.

Equity release needs specialist advice. John holds the CeRER equity release qualification, and we'll always talk through the alternatives first.

If you only remember one thing

Bring your family into the conversation early. It's their inheritance too.

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11PropertyWhat is rental yield, and is buy-to-let still worth it?Gross yield is the annual rent divided by the purchase price, as a percentage. Net yield takes off costs. With new tenant rules since May 2026 and higher tax on property income from April 2027, the numbers matter more than ever.Read the full answer

Updated October 2026 · Reviewed by John Williams, CeMAP CeRER

Working it out

Gross yield = annual rent ÷ price × 100. A £180,000 house let at £1,000 a month earns £12,000 a year, so the gross yield is 6.7%.

Net yield takes off running costs — letting fees, insurance, repairs, empty months and service charges. If those come to £3,000, the net yield is 5%.

What lenders look at

Buy-to-let lenders check the rent covers the mortgage interest by a margin, often 125% for basic-rate taxpayers and 145% for higher-rate taxpayers, at a stress rate. Many need a 25% deposit.

What's changed for landlords

ChangeWhen
Renters' Rights Act: Section 21 abolished, rolling tenancies, one rent rise a yearFrom 1 May 2026
Making Tax Digital for landlords with over £50,000 of incomeFrom April 2026
Property income tax rates rise to 22%, 42% and 47%From April 2027
5% stamp duty surcharge on additional homesSince October 2024

Mortgage interest on personally owned lets only gets a basic-rate tax credit, which is why many landlords look at buying through a limited company. That's a tax decision, so get an accountant's view as well as ours.

If you only remember one thing

Run the numbers on net yield after tax, not on gross rent. That's where buy-to-let succeeds or fails now.

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12SchemesWhat is a Lifetime ISA, and what's replacing it?A Lifetime ISA lets 18 to 39-year-olds save up to £4,000 a year and get a 25% government bonus towards a first home worth up to £450,000. The government plans to replace it with a First Time Buyer ISA, but no launch date has been confirmed.Read the full answer

Updated October 2026 · Reviewed by John Williams, CeMAP CeRER

Lifetime ISA — the rules today

RuleDetail
Who can openAges 18–39
Pay inUp to £4,000 a year, until you're 50
Bonus25% — up to £1,000 a year
Property price cap£450,000
Account ageOpen at least 12 months before you use it
Other withdrawals25% charge (you lose more than the bonus)

The proposed First Time Buyer ISA

The government consulted on a replacement, which closed on 18 August 2026. Proposals include no upper age limit, the bonus paid when you buy rather than as you save, and no withdrawal penalty. Contribution limits, the bonus rate and the price cap haven't been confirmed. Existing Lifetime ISAs carry on under the current rules for now.

Got a Help to Buy ISA?

They closed to new savers in 2019. You can pay in until November 2029 and must claim the bonus by November 2030, on homes up to £250,000 (£450,000 in London).

Cash ISA changes

From April 2027 the cash ISA limit falls to £12,000 for under-65s, within the £20,000 overall ISA allowance.

If you only remember one thing

Check the £450,000 cap before you offer. Go over it and you lose the bonus and pay the 25% charge.

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This is general information, not personal advice. Rules, rates and lender criteria change, so we'll always check your own situation before you make a decision. Your home may be repossessed if you do not keep up repayments on your mortgage.

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