You can legally cut your tax bill by using your allowances and reliefs: pension contributions, ISAs, the dividend and savings allowances, Marriage Allowance, salary sacrifice and Gift Aid. Spreading income and gains across tax years and between spouses also helps. This is legitimate tax planning, not tax avoidance.
The short answer
- Legal tax saving means using allowances and reliefs in full, not exploiting loopholes.
- Pensions and ISAs are the two biggest levers: relief at your marginal rate, and tax-free growth.
- Most allowances reset every 6 April and cannot be carried forward, so act before the deadline.
Paying less tax legally is not about clever schemes: it is about using, in full, the allowances and reliefs the government deliberately built into the system. Most households leave money on the table simply because they don’t claim everything they are entitled to. The moves below are all legitimate, well-established, and used every day by people working with a tax planning specialist.
Use your allowances before they reset
Many allowances work on a strict use-it-or-lose-it basis each tax year, resetting every 6 April. The biggest are the £20,000 ISA allowance, the £60,000 pension annual allowance, the £3,000 Capital Gains Tax exemption, the £500 dividend allowance and your Personal Savings Allowance. Nothing carries over (with the narrow exception of unused pension allowance under carry-forward rules), so timing contributions before the deadline genuinely matters.
- 1
Fill your pension first
Contributions receive tax relief at your marginal rate, 20%, 40% or 45%. A £100 pension contribution costs a higher-rate taxpayer just £60 after relief. It is the most powerful legal tax break available to most people.
- 2
Shelter savings and investments in an ISA
Up to £20,000 a year grows free of Income Tax, dividend tax and Capital Gains Tax, forever. Moving existing holdings into an ISA (“Bed and ISA”) locks in future tax-free growth.
- 3
Claim Marriage Allowance
If one spouse earns under £12,570 and the other is a basic-rate taxpayer, you can transfer £1,260 of Personal Allowance and save up to £252 a year, and backdate the claim four years.
- 4
Use salary sacrifice
Swapping salary for pension contributions, an electric car or extra holiday cuts both Income Tax and National Insurance, and can pull you back under key thresholds like £100,000 or £50,270.
- 5
Give through Gift Aid
Charitable donations extend your basic-rate band, so higher-rate taxpayers reclaim the difference and reduce their adjusted net income at the same time.
Share income and gains across the household
Married couples and civil partners can transfer assets between themselves with no Capital Gains Tax and no Inheritance Tax. That means income-producing savings, shares and rental property can be held in the name of whichever spouse pays the lower rate, using two Personal Allowances, two sets of savings and dividend allowances, and two Capital Gains exemptions. For families, this is one of the most valuable and under-used levers there is. If one partner is a non-taxpayer and the other pays 40%, simply moving a portfolio into the lower earner’s name can turn a chunky annual tax bill into nothing at all, entirely within the rules.
The same logic applies to selling assets. Because each person has their own £3,000 Capital Gains Tax exemption, transferring half of a holding to your spouse before a sale means two exemptions are available rather than one. Done in advance of a disposal, this is a routine and legitimate step that can noticeably reduce the tax on a gain.
Time your income and disposals
Because allowances renew each year, spreading a large gain or withdrawal across two tax years can keep you inside a lower band. Realising an investment gain in March and again in April uses two annual exemptions rather than one. Retirees can do the same with pension withdrawals, a theme we explore in tax-efficient retirement income. Deferring a bonus or dividend to a year when your income is lower can also make a real difference, particularly if it keeps you below a threshold such as £50,270 or £100,000.
Order matters as much as amount. Drawing from a tax-free ISA rather than a taxable investment in a high-income year, or taking a slice of pension tax-free cash instead of taxable income, changes your bill without changing your lifestyle. Business owners have further options, such as balancing salary and dividends, or timing a sale to benefit from Business Asset Disposal Relief, which is charged at 18% from April 2026. The common thread is planning ahead: most of these moves must be made before the tax year ends to count.
Where the line is
Legitimate planning uses reliefs as intended. Contrived schemes promising to make tax “disappear”, often marketed aggressively, can be defeated by HMRC under anti-avoidance rules, leaving you with the original bill plus interest and penalties. If something sounds too good to be true, it usually is.
When to bring in an adviser
The reliefs above interact in ways that are easy to get wrong: a pension contribution can simultaneously reclaim higher-rate relief, restore your Personal Allowance and reinstate Child Benefit. A good adviser models the whole picture rather than one allowance in isolation. Our fuller personal tax planning guide walks through the framework. This is information, not personal advice; investments can fall as well as rise. Vetted Wealth can match you, free of charge, with an independently vetted, FCA-regulated adviser through the tax planning service.
In summary
- Legal tax saving means using allowances and reliefs in full, not exploiting loopholes.
- Pensions and ISAs are the two biggest levers: relief at your marginal rate, and tax-free growth.
- Most allowances reset every 6 April and cannot be carried forward, so act before the deadline.
- Married couples can shift income and gains to the lower-earning partner to use two sets of allowances.
- Aggressive avoidance schemes carry real risk; sensible planning is safe and effective.
Sources and further reading
- Income Tax rates and allowances GOV.UK
- Capital Gains Tax GOV.UK
- Self Assessment GOV.UK
Read the full guide
For the complete picture, see our in-depth guide: How to Reduce Your Tax Bill.
Speak to a vetted tax planning specialist
This is free information, not personal advice. When you’re ready, we’ll match you with an independently vetted, FCA-regulated specialist, free, and with no obligation.
