UK Tax Tips
Short explainers on the tax rules most people overlook, and how to use them legally. The official GOV.UK, HMRC and OBR sources for the figures are listed at the end of the page.
Capital Gains Tax
Understanding how gains are taxed — and where the allowances sit.
Pensions & Salary Sacrifice
The most tax-efficient route to building long-term wealth.
ISA Strategy
The UK's most powerful tax-free wrapper — in all its forms.
The ISA Allowance: Use It or Lose It
Every UK adult gets a £20,000 annual ISA allowance. All growth, dividends and interest inside an ISA are permanently tax-free — no Income Tax, Capital Gains Tax, or Dividend Tax, ever. Unused allowance vanishes on 5 April each year and cannot be reclaimed. A couple can shelter £40,000 per year combined. The full guide covers flexible ISAs and how a Bed & ISA transfer works.
The Lifetime ISA: a 25% government bonus (with conditions)
The Lifetime ISA adds a 25% government bonus to up to £4,000 of savings a year, so up to £1,000 a year. You can open one aged 18 to 39 and pay in until 50. The money can go towards a first home costing up to £450,000, or be taken from age 60. Take it out for any other reason (unless you are terminally ill) and a 25% withdrawal charge applies to the whole amount withdrawn, which takes back the bonus and some of your own money: GOV.UK's example turns £800 paid in, plus a £200 bonus, into £750 back. The full guide explains when the charge applies and what it costs.
Junior ISAs: Start the Clock Early
Every UK child can hold a Junior ISA with a £9,000 annual allowance, entirely separate from the adult limit. All growth is permanently tax-free. With 18 years of compound growth, even £100 per month in a global equity index fund could grow to about £43,000, assuming 7% a year compounded monthly and no charges, all tax-free. Anyone can contribute: parents, grandparents, relatives. At 18 the JISA automatically converts to an adult ISA and the child gains full control.
Income Tax Anomalies
The hidden traps built into the UK income tax system.
The 60% tax rate between £100,000 and £125,140
The UK Personal Allowance is withdrawn above £100,000 — falling by £1 for every £2 of income until it reaches zero at £125,140. This creates an effective marginal rate of 60% on every pound earned in that band: 40% Income Tax plus a further 20% equivalent from the lost allowance being taxed. Someone with adjusted net income of £110,000 has lost £5,000 of personal allowance, which costs £2,000 in tax at 40%. A £10,000 gross pension contribution brings their adjusted net income back to £100,000 and restores the allowance: that £2,000 saving comes on top of the usual 40% relief, so the contribution saves £6,000 of tax in all. Losing the whole allowance, from £125,140, costs £5,028.
Fiscal Drag: The Silent Tax Rise
When income tax thresholds are frozen and wages rise with inflation, more income flows into higher tax bands automatically — without any headline rate change. UK income tax thresholds have been frozen since April 2022 and are now due to stay frozen until 5 April 2031. When the freeze was due to end in April 2028, the OBR estimated that frozen allowances and thresholds would mean 3.7 million more people paying Income Tax in 2028/29, and 2.7 million more paying the higher rate. It is one of the largest stealth tax increases in modern UK fiscal history, yet most of those affected are unaware it has happened to them.
Sources
Checked on 2 October 2026.
- Spouse transfers: Taxation of Chargeable Gains Act 1992, section 58; the £3,000 allowance: GOV.UK, Capital Gains Tax allowances.
- Salary sacrifice: HMRC, Salary sacrifice for employers; the 8%, 2% and 15% National Insurance rates: HMRC, Rates and thresholds for employers 2026 to 2027.
- ISAs: GOV.UK, Individual Savings Accounts and GOV.UK, Junior ISAs.
- Lifetime ISA bonus, limits and the 25% withdrawal charge, including the £800 example: GOV.UK, Lifetime ISA and GOV.UK, Withdrawing money from your Lifetime ISA.
- Personal Allowance taper above £100,000: GOV.UK, Income Tax rates and Personal Allowances.
- Frozen thresholds: HMRC policy paper, Maintaining Income Tax thresholds until 5 April 2031; the 3.7 million and 2.7 million estimates: OBR, Economic and fiscal outlook, March 2024, paragraph 3.39.
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