Financial Glossary: 60+ Terms Explained
Plain-English definitions for the financial, tax, property, and investment terms you need to know
Whether you are calculating your tax, comparing mortgages, or planning investments, understanding the terminology makes all the difference. This glossary covers the key financial terms you will encounter across our calculators and in everyday financial life.
A
AER (Annual Equivalent Rate)
The interest rate on a savings account expressed as if interest were paid and compounded once a year. AER makes it easy to compare savings accounts that pay interest at different intervals.
Amortisation
The process of spreading a loan repayment over time through regular payments. Each payment covers part of the interest and part of the principal, gradually reducing the balance to zero.
Annuity
A financial product that provides a guaranteed income for life or a set period, usually purchased with a pension pot at retirement. The income amount depends on the pot size, your age, and current annuity rates.
APR (Annual Percentage Rate)
The total cost of borrowing expressed as a yearly percentage, including interest and mandatory fees. Lenders must show the APR so you can compare the true cost of loans and credit cards.
Asset
Anything of financial value that you own, such as property, savings, investments, or a vehicle. Your net worth is calculated by subtracting your liabilities (debts) from your total assets.
B
Base Rate
The interest rate set by the Bank of England that influences borrowing and savings rates across the economy. When the base rate rises, loans typically become more expensive and savings rates tend to improve.
BMI (Body Mass Index)
A measure of body fat based on height and weight. While not a financial term, BMI calculators are among the most popular health tools and can influence life insurance premiums.
Bond
A fixed-income investment where you lend money to a government or company in return for regular interest payments and the return of your capital at maturity. Bonds are generally considered lower risk than shares.
Break-Even Point
The point at which income equals expenses, meaning no profit or loss. In business, it tells you how much you need to sell to cover your costs. In property, it tells you when rental income covers your mortgage and expenses.
BTL (Buy-to-Let)
A property purchased specifically to rent out to tenants. BTL mortgages have different criteria to residential mortgages, typically requiring a larger deposit and charging higher interest rates.
C
Capital Gains
The profit made when you sell an asset for more than you paid for it. In the UK, capital gains above the annual exempt amount are subject to Capital Gains Tax (CGT).
CGT (Capital Gains Tax)
A tax on the profit from selling assets such as shares, property (not your main home), or valuables worth over £6,000. The rate depends on your income tax band and the type of asset sold.
Compound Interest
Interest calculated on both the initial principal and the accumulated interest from previous periods. Compound interest makes savings grow exponentially over time and is why starting to save early makes such a big difference.
Corporation Tax
A tax paid by UK limited companies on their profits. The main rate is 25% for profits over £250,000, with a small profits rate of 19% for profits under £50,000 and marginal relief in between.
Credit Score
A numerical rating that represents your creditworthiness based on your borrowing history, repayment record, and financial behaviour. Lenders use credit scores to decide whether to offer you credit and at what interest rate.
D
Depreciation
The decrease in an asset's value over time due to wear, age, or obsolescence. Cars, equipment, and machinery all depreciate. Understanding depreciation helps you calculate the true cost of ownership.
Dividend
A payment made by a company to its shareholders from its profits. Dividends provide income from share investments and are taxed at different rates to employment income in the UK.
Drawdown
A flexible way to access your pension savings in retirement. Instead of buying an annuity, you keep your pension invested and withdraw income as needed, giving you control over how much you take and when.
DSCR (Debt Service Coverage Ratio)
A measure used by lenders to assess whether a property's rental income is sufficient to cover mortgage payments. A DSCR of 1.25 means rental income is 125% of the mortgage cost, which is a common minimum requirement.
E
Equity
The portion of an asset that you truly own. For property, equity is the market value minus any outstanding mortgage. Building equity through mortgage repayments or property price increases strengthens your financial position.
Equity Release
A way for homeowners aged 55 or over to access the value tied up in their property without selling it. The two main types are lifetime mortgages and home reversion plans. The loan plus interest is repaid when you die or move into care.
EPC (Energy Performance Certificate)
A rating from A to G showing how energy-efficient a property is. EPCs are required when selling or renting a property in the UK. A higher rating can reduce energy bills and increase property value.
F
Fixed Rate
An interest rate that stays the same for a set period, regardless of changes to the Bank of England base rate. Fixed-rate mortgages give you certainty over your monthly payments for the fixed period, typically 2-5 years.
FCA (Financial Conduct Authority)
The UK body that regulates financial firms and markets. The FCA ensures that financial products are fair, markets are honest, and consumers are protected.
G
Gross Income
Your total income before any deductions such as tax, National Insurance, or pension contributions. Gross income is the starting point for most tax calculations.
Gross Yield
The annual rental income from a property expressed as a percentage of the property's value, before deducting any expenses. A property worth £200,000 generating £12,000 per year in rent has a gross yield of 6%.
H
HMRC (His Majesty's Revenue and Customs)
The UK government department responsible for collecting taxes, paying some forms of state support, and administering tax codes and National Insurance. HMRC oversees income tax, VAT, corporation tax, and more.
HTB (Help to Buy)
A former UK government scheme that helped first-time buyers purchase new-build homes with an equity loan. While the scheme closed to new applicants in 2023, existing loans remain active and must be repaid.
I
IHT (Inheritance Tax)
A tax on the estate of someone who has died. In the UK, IHT is charged at 40% on the value above the nil-rate band (£325,000). The residence nil-rate band adds a further £175,000 if you leave your home to direct descendants.
Index Fund
An investment fund that tracks a market index such as the FTSE 100 or S&P 500. Index funds offer broad diversification at low cost and are popular with long-term investors who want market-matching returns.
Inflation
The rate at which prices for goods and services increase over time, reducing purchasing power. The Bank of England targets 2% annual inflation. Understanding inflation is essential for long-term financial planning.
IR35
Tax legislation that determines whether a contractor is genuinely self-employed or effectively an employee for tax purposes. If caught by IR35, the contractor (or their client) must pay employment-level taxes.
ISA (Individual Savings Account)
A tax-free savings or investment wrapper. You can save up to £20,000 per tax year across Cash ISAs, Stocks and Shares ISAs, and Innovative Finance ISAs without paying tax on interest or gains.
J
Joint Mortgage
A mortgage taken out by two or more people, typically partners or friends buying a property together. All borrowers are jointly responsible for the full mortgage amount, and all incomes can be considered for affordability.
K
KPI (Key Performance Indicator)
A measurable value that shows how effectively an individual or business is achieving key objectives. In personal finance, KPIs might include savings rate, debt-to-income ratio, or net worth growth.
L
LTV (Loan-to-Value)
The ratio of your mortgage to the property value, expressed as a percentage. A £180,000 mortgage on a £200,000 property is 90% LTV. Lower LTV ratios typically unlock better mortgage rates because the lender faces less risk.
LISA (Lifetime ISA)
A savings account for adults aged 18-39 that offers a 25% government bonus on contributions up to £4,000 per year. The money can be used to buy your first home (up to £450,000) or withdrawn after age 60.
Liability
A financial obligation or debt that you owe. Mortgages, loans, credit card balances, and unpaid bills are all liabilities. Your net worth is your assets minus your liabilities.
M
Marginal Relief
A mechanism that gradually increases the corporation tax rate for companies with profits between £50,000 and £250,000, avoiding a sudden jump from the 19% small profits rate to the 25% main rate.
Mortgage
A loan specifically for purchasing property, secured against the property itself. If you fail to keep up repayments, the lender can repossess the property. Mortgages typically run for 25-35 years.
Mortgage Overpayment
Paying more than your required monthly mortgage payment to reduce the outstanding balance faster. Overpayments save interest and shorten the mortgage term. Most lenders allow overpayments of up to 10% of the balance per year.
N
Net Income
Your income after all deductions including tax, National Insurance, and pension contributions. Also known as take-home pay, this is the amount that actually arrives in your bank account.
Net Yield
The return on a property investment after deducting all expenses such as mortgage interest, maintenance, insurance, and management fees. Net yield gives a more realistic picture of profitability than gross yield.
NI (National Insurance)
Contributions paid by employees, employers, and the self-employed that fund state benefits including the State Pension, NHS, and unemployment support. NI is calculated as a percentage of earnings above certain thresholds.
O
Overpayment
Paying more than the required amount on a loan or mortgage. Regular overpayments can significantly reduce the total interest paid and shorten the loan term, potentially saving thousands over the life of a mortgage.
P
PAYE (Pay As You Earn)
The system used by employers to deduct income tax and National Insurance from employees' wages before they are paid. Most UK employees have their tax collected through PAYE rather than filing a self-assessment return.
Pension
A long-term savings plan designed to provide income in retirement. Workplace pensions benefit from employer contributions and tax relief. The UK State Pension provides a baseline income from state retirement age.
Personal Allowance
The amount of income you can earn each tax year before paying income tax. For 2025/26, the personal allowance is £12,570. It reduces by £1 for every £2 earned above £100,000.
Premium
The amount you pay for an insurance policy, typically monthly or annually. Insurance premiums vary based on risk factors, coverage level, and the type of insurance (car, home, life, health).
R
Remortgage
Switching your existing mortgage to a new deal, either with the same lender or a different one. People remortgage to get a better interest rate, release equity, or consolidate debts.
ROI (Return on Investment)
The profit from an investment expressed as a percentage of the original cost. An investment that cost £10,000 and returned £12,000 has an ROI of 20%. ROI helps you compare the profitability of different investments.
S
SDLT (Stamp Duty Land Tax)
A tax paid when purchasing property in England and Northern Ireland above certain thresholds. First-time buyers benefit from higher thresholds and reduced rates. Scotland and Wales have their own equivalents (LBTT and LTT).
SIPP (Self-Invested Personal Pension)
A pension that gives you full control over your investment choices. SIPPs offer a wider range of investments than standard pensions, including individual shares, funds, and commercial property.
SVR (Standard Variable Rate)
The default interest rate your mortgage reverts to after a fixed or tracker deal ends. SVRs are usually significantly higher than fixed rates, which is why most borrowers remortgage before their deal expires.
T
Tax Code
A code used by HMRC to tell your employer how much tax to deduct from your pay. The most common code is 1257L, which means you have the standard £12,570 personal allowance. An incorrect tax code means you could be paying too much or too little tax.
Tax Relief
A reduction in the amount of tax you owe, provided by the government to encourage certain activities. Pension contributions, charitable donations, and some business expenses qualify for tax relief.
TDEE (Total Daily Energy Expenditure)
The total number of calories your body burns in a day, including exercise. While a health metric rather than financial, TDEE calculators are popular tools on our platform for fitness and nutrition planning.
Tracker Mortgage
A mortgage with an interest rate that follows the Bank of England base rate plus a set margin. If the base rate goes up, your payments increase; if it falls, your payments decrease.
V
VAT (Value Added Tax)
A consumption tax added to most goods and services in the UK. The standard rate is 20%, with a reduced rate of 5% for some items and 0% for essentials like most food and children's clothing.
VED (Vehicle Excise Duty)
The annual tax you pay to keep your vehicle on the road, commonly known as road tax or car tax. VED rates depend on your vehicle's CO2 emissions, fuel type, and when it was first registered.
Void Period
The time a rental property sits empty between tenants, generating no income. Void periods are an important cost to factor into buy-to-let calculations. Most landlords budget for 1-2 months of voids per year.
W
Wealth Tax
A tax levied on an individual's total net worth rather than their income. While the UK does not currently have a wealth tax, it is frequently discussed in policy debates as a way to address inequality.
Y
Yield
The income earned from an investment, expressed as a percentage. For property, yield is the annual rent divided by the property value. For shares, yield is the annual dividend divided by the share price. Higher yields generally indicate higher risk.
Put These Terms into Practice
Now that you understand the terminology, try our free calculators to apply this knowledge to your own finances:
Frequently Asked Questions
Why should I learn financial terminology?
Understanding financial terms helps you make better decisions with your money. When you know what APR, LTV, or compound interest really mean, you can compare products confidently, ask the right questions, and avoid costly mistakes. Financial literacy is one of the most valuable life skills you can develop.
What is the difference between APR and AER?
APR (Annual Percentage Rate) is the cost of borrowing money, including interest and fees, expressed as a yearly rate. AER (Annual Equivalent Rate) is the interest rate you earn on savings, accounting for compounding. In simple terms, APR is what you pay on loans and credit cards, while AER is what you earn on savings accounts.
Where can I learn more about managing my finances?
Start with our free calculators to understand your current financial position. For further guidance, MoneyHelper (formerly the Money Advice Service) offers free, impartial advice. Citizens Advice can help with debt problems, and HMRC provides official guidance on tax matters. Our glossary is a great reference to keep bookmarked as you learn.