Understanding UK Tax

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Appendix: A Plain-English Dictionary of UK Tax Jargon ​

Key point: HMRC and professional advisers rely heavily on abbreviations. For newcomers, those terms can appear opaque. This appendix sets out the most common UK tax expressions in straightforward language.

HMRC ​

Full name: HM Revenue & Customs

Plain English: The UK tax authority. It has the legal power to collect tax, investigate problems, and enforce compliance.

PAYE ​

Full name: Pay As You Earn

Plain English: The payroll withholding system. Your employer deducts tax and National Insurance before your salary reaches your bank account.

NI or NIC ​

Full name: National Insurance Contributions

Plain English: Another major mandatory deduction from income. It helps fund the State Pension and the wider social security system.

Personal Allowance ​

Plain English: The amount of annual income you can normally receive before Income Tax starts. For many people this is around £12,570, though it can be withdrawn at higher income levels.

Basic Rate, Higher Rate, Additional Rate ​

Plain English: The different Income Tax bands. As income rises, the next slice of income may be taxed at a higher percentage.

Child Benefit and the High Income Child Benefit Charge ​

Plain English: Child Benefit is the payment families can receive for children. The High Income Child Benefit Charge (HICBC) recovers some or all of it once one partner's Adjusted Net Income rises above the relevant threshold.

CGT ​

Full name: Capital Gains Tax

Plain English: Tax on gains when selling assets such as investment properties or shares.

PRR ​

Full name: Private Residence Relief

Plain English: The relief that can exempt gains on the sale of your genuine main home.

SDLT ​

Full name: Stamp Duty Land Tax

Plain English: The transaction tax paid on property purchases in England, often with surcharges for additional dwellings.

Section 24 ​

Plain English: The rule that limits how individual landlords get relief for mortgage interest on rental property.

SPV ​

Full name: Special Purpose Vehicle

Plain English: A company set up for a specific activity, commonly used in property investing to hold buy-to-let assets.

Joint Tenants and Tenants in Common ​

Plain English: Two different ways of jointly owning property. The distinction matters greatly for tax planning, succession, and beneficial ownership.

Form 17 ​

Plain English: The HMRC form used by married couples or civil partners in certain cases to declare unequal beneficial interests in jointly owned property income.

Self Assessment ​

Plain English: The personal tax return system used to report income not fully taxed under PAYE, such as self-employment profits, rental income, and dividends.

Payment on Account ​

Plain English: HMRC's advance collection system. If your bill is high enough, you may have to prepay part of the following year's tax.

Sole Trader vs Limited Company ​

Plain English: A sole trader trades in their own name and remains personally exposed. A limited company is a separate legal entity with its own tax and legal identity.

VAT ​

Full name: Value Added Tax

Plain English: The consumption tax applied to many goods and services, often at 20%, with major consequences for pricing and cash flow.

Corporation Tax ​

Plain English: The tax charged on company profits.

Dividends ​

Plain English: Payments of profit from a company to its shareholders, often used as a tax-efficient extraction method compared with salary.

ISA ​

Full name: Individual Savings Account

Plain English: A tax-sheltered account for savings and investments. Interest, dividends, and gains inside are usually free from UK tax.

SIPP ​

Full name: Self-Invested Personal Pension

Plain English: A personal pension structure that can be used both for retirement investing and, for higher earners, as a significant tax-planning tool.