You can be doing very well financially and still have money slipping through the cracks.
A pay rise, growing savings, old pensions, investments, family gifts. Individually, none of these feels especially complicated. Put them together, and your tax position can change without you really noticing.
The problem is not always what you are doing. It is what you have not reviewed for a while.
Good tax planning is not about loopholes. It is about knowing which allowances apply to you, using them properly and making sure one financial decision is not working against another.
Start with these five areas.
The figures below apply to the 2026/27 tax year. Income Tax bands differ in Scotland, so Scottish taxpayers will need to check the relevant rates.
1. Has your income changed, but your pension contribution stayed the same?
A pay rise is good news. But the figure hitting your bank account does not always tell you the full story.
For most people in England, Wales and Northern Ireland, the standard Personal Allowance is £12,570. Income above that is taxed at 20% until total income reaches £50,270, then at 40% until £125,140. Income above £125,140 is generally taxed at 45%. Scotland has different Income Tax bands and rates.
There is another point worth knowing if your income is around £100,000.
Once your adjusted net income goes above £100,000, your Personal Allowance is reduced by £1 for every £2 of additional income. It disappears completely when adjusted net income reaches £125,140.
That can make the tax position between those figures particularly painful.
Pension contributions may help because they can build your retirement savings while also reducing your adjusted net income, depending on how the contribution is made. But this is not a case of throwing money into a pension purely to save tax.
You still need to consider:
- how much you can comfortably afford to lock away
- what your employer already contributes
- how the pension scheme gives tax relief
- whether you have used pension allowances elsewhere
- when you may need access to the money
The standard pension annual allowance is £60,000 for 2026/27, but it can be lower for some high earners and for people who have already flexibly accessed taxable pension benefits. Tax relief on personal contributions is also normally restricted by your relevant UK earnings.
Start here
Look at your total income, not just your basic salary. Bonuses, taxable benefits, rental income, interest and dividends may all affect the picture.
Then check what is going into your pension and how the tax relief is being applied. Higher- and additional-rate taxpayers sometimes need to claim extra relief themselves when contributions are made under a relief-at-source arrangement.
Do not assume payroll, your pension provider and HMRC have joined all the dots for you.
2. Your savings are growing. Is the interest now taxable?
Keeping cash available is sensible. You may need it for emergencies, planned spending or simply to sleep well at night.
But cash savings can quietly create a tax bill.
For 2026/27, the Personal Savings Allowance is:
- £1,000 for basic-rate taxpayers
- £500 for higher-rate taxpayers
- £0 for additional-rate taxpayers
People with lower non-savings income may also qualify for a starting rate for savings of up to £5,000. That starting-rate band reduces as other income rises and is unavailable once other income reaches £17,570.
The allowance applies to interest across your relevant accounts, not separately to each bank.
So if you have cash spread between several providers, it is worth adding up the interest from all of them. The balance alone does not tell you whether tax is due because different accounts pay different rates.
Could a Cash ISA help?
Interest earned inside an Individual Savings Account, commonly referred to as ISA, is free from UK Income Tax. The overall adult ISA subscription limit remains £20,000 for 2026/27. You can divide that allowance across eligible types of ISA, subject to the rules.
That does not mean every spare pound belongs in an ISA.
Before moving cash, ask:
- Is the interest rate competitive?
- Will you need access to the money?
- Does the account have withdrawal restrictions?
- Have you already used part of your ISA allowance?
- Is this genuinely short-term money, or could some of it be invested for longer-term goals?
Tax is one part of the decision. It should not be the only part.
3. Are your investments sitting in the right place?
When people start investing, they often focus on what to buy.
The account holding those investments matters too.
Investments held inside a Stocks and Shares ISA are sheltered from UK Capital Gains Tax and Income Tax on dividends. The adult ISA limit is £20,000 for 2026/27.
Outside an ISA or pension, tax may become relevant.
The Capital Gains Tax annual exempt amount is £3,000 for 2026/27. For most individuals gains arising from 6 April 2026, the applicable CGT rates are 18% and 24%, depending on how much of the gain falls within the person’s unused basic-rate band. Different rules and reliefs can apply to particular assets and circumstances.
The dividend allowance is £500. For 2026/27, dividends above available allowances are taxed at 10.75% for basic-rate taxpayers, 35.75% for higher-rate taxpayers and 39.35% for additional-rate taxpayers. Your overall income determines which rate or rates apply.
None of that means you should rush to sell an investment.
Selling can trigger tax, take you out of the market and alter the balance of your portfolio. Charges and dealing costs may also apply.
Before making changes, check:
- the original purchase cost
- the current value
- any previous purchases of the same investment
- gains or losses already realised this tax year
- whether you have unused allowable losses from earlier years
- how much ISA allowance remains
- whether the investment is still right for you
Allowable capital losses can generally be set against chargeable gains, subject to the rules and reporting requirements.
The aim is not to make tax drive every investment decision. It is to stop avoidable tax from taking a larger share than necessary.
4. Are you looking at family money as a whole?
Money within a family rarely sits in neat individual boxes.
One person may earn more. One may have stepped back from work. Savings may be held unevenly. Parents may be putting money aside for children while also trying to catch up on their own pensions.
This is where tax planning and financial fairness need to be considered together.
Marriage Allowance
Marriage Allowance lets an eligible person transfer £1,260 of their Personal Allowance to a spouse or civil partner.
It can reduce the recipient’s tax by up to £252 for the year. Broadly, the person transferring the allowance must usually have income below their Personal Allowance, while the recipient must be a basic-rate taxpayer, or pay tax at eligible Scottish rates. It is not available simply because two people live together.
It is not a huge amount. But it is worth checking, particularly after parental leave, a career break, redundancy or a change in working hours.
Holding assets between spouses or civil partners
Transfers of assets between spouses and civil partners who are living together can generally take place on a no-gain, no-loss basis for Capital Gains Tax. This means there is usually no immediate CGT charge on the transfer. The recipient effectively takes over the original tax history, so tax may arise when they later dispose of the asset.
That can create planning opportunities, but it should never be described as simply “put the money in the lower earner’s name”.
Ownership matters.
Before transferring money or investments, both people should understand:
- who will legally own the asset
- who can access it
- who will receive the income
- what happens if the relationship changes
- whether the arrangement still feels fair
A lower household tax bill is not automatically a good outcome if one person loses financial independence in the process.
Saving for children
The Junior ISA allowance is £9,000 for 2026/27. Money inside a Junior ISA can grow free from UK Income Tax and Capital Gains Tax.
But there is a point parents and grandparents sometimes miss: the money belongs to the child.
The child can take control of the account at 16 and can normally withdraw the money at 18.
So before putting a large amount into a Junior ISA, decide whether you are genuinely comfortable with the child having full access at 18.
You may be. But make that decision with your eyes open.
5. Are you giving money away without looking at your own future first?
Helping children, grandchildren or other relatives can be deeply important.
It can also be one of the areas where emotion overtakes planning.
The Inheritance Tax annual gift exemption is £3,000. Any unused annual exemption can generally be carried forward for one tax year, but only after the current year’s exemption has been used. Other exemptions may apply to certain small gifts, wedding or civil-partnership gifts and qualifying gifts made from normal income.
Larger outright gifts to individuals may fall outside the estate for Inheritance Tax if the giver survives for seven years. But “the seven-year rule” is not a complete inheritance plan.
The result can depend on:
- the type of gift
- who receives it
- whether the giver retains any benefit
- other gifts made during the period
- the value of the estate
- which exemptions are available
- when the giver dies
Gifts may also have consequences beyond Inheritance Tax. Giving away an investment or property can create Capital Gains Tax issues, even when no money changes hands.
What about the family home?
The standard Inheritance Tax nil-rate band is £325,000.
A residence nil-rate band of up to £175,000 may also be available when a qualifying home passes to direct descendants, subject to conditions. The residence allowance can be reduced for estates valued above £2 million. Unused allowances may sometimes transfer between spouses or civil partners.
That is how some married couples and civil partners may be able to pass on as much as £1 million before Inheritance Tax becomes due:
- two standard nil-rate bands: 2 × £325,000 = £650,000
- two residence nil-rate bands: 2 × £175,000 = £350,000
- combined potential allowances: £650,000 + £350,000 = £1,000,000
That £1 million figure is not automatic. It depends on the estate, the property, the beneficiaries and whether the relevant allowances are available.
The question to ask first
Do not start with: “How much can I give away?”
Start with: “How much can I afford to give away without limiting my own choices later?”
You may live longer than expected. You may want to retire earlier. Your health could change. You may need to pay for care or adapt your home.
Once money has genuinely been given away, it is no longer yours.
Your five-minute tax check
You do not need to tackle everything at once. Start with the part of your financial life that has changed most.
Ask yourself:
- Has my income or bonus changed?
- Am I close to or above £100,000 of adjusted net income?
- Do I know how much interest my cash is producing?
- Are investments held outside pensions or ISAs?
- Have I used my ISA allowance deliberately?
- Have my pension contributions kept pace with my income?
- Are family assets owned in a way that is understood and fair?
- Have I made gifts without recording them?
- Does my will still reflect what I actually want?
One unanswered question is enough to give you a starting point.
Clarity first. Action second.
Tax planning is not about collecting every allowance for the sake of it.
It is about understanding which rules affect you, keeping proper records and making decisions that work for your wider life.
Sometimes the right move will reduce tax. Sometimes it will not.
The important thing is that you know why you are making it.