How high earners can cut their UK income tax bill before the tax year ends
For many high earners, income tax is often the biggest annual expense… and the most frustrating one. Despite earning well, it’s common to feel that too much of your hard-earned money disappears in tax each year.
The reality is that this often happens not because of mistakes, but because valuable allowances and reliefs go unused. Even towards the end of the tax year, there are still legitimate and practical ways to reduce your income tax without relying on complex schemes or risky strategies.
If you’re a company director, consultant, contractor, or senior professional, this blog outlines clear and simple options to help you make better use of what’s already available to you.
Why the last few weeks matter
For high earners, tax is rarely straightforward and timing can make a significant difference. As the tax year draws to a close, the final weeks represent a crucial window to review income levels, use allowances and make strategic decisions before opportunities disappear.
Once income rises beyond certain thresholds, additional rules come into play. Personal allowances begin to disappear, pension limits can taper and marginal tax rates quietly climb higher than many people expect.
In the UK, this complexity starts sooner than many realise. When income exceeds £100,000, the personal allowance is gradually withdrawn, creating an effective tax rate of 60% on part of your earnings.
Above £125,140, the additional rate of 45% applies. Without proactive planning before the tax year ends, high earners can easily miss reliefs and allowances and end up paying more tax than necessary.
Pensions still do the heavy lifting
If there’s one area that consistently delivers for high earners, it’s pension planning. Putting money into a pension reduces your taxable income and attracts tax relief at your highest rate. For someone paying higher or additional rate tax, that relief can be substantial.
Most people can contribute up to £60,000 a year, though high earners may face a reduced allowance. Unused allowances from the past three tax years can sometimes be carried forward.
For business owners and directors, employer pension contributions are often even more efficient. They are usually deductible for corporation tax and do not attract National Insurance. For many, this is one of the most tax efficient ways to move money out of a company.
Don’t ignore your ISA allowance
If you’re married or in a civil partnership, combining allowances can shelter a meaningful amount of savings and investments from future tax.
Each tax year, you can invest up to £20,000 into ISAs. If you don’t use this allowance by the deadline, it’s lost. Any investments held within an ISA can grow free from income tax and capital gains tax, making ISAs a highly effective long term tax efficient savings option as your wealth grows.
For married couples and civil partners, using both allowances together can protect a significant amount of wealth from future tax.
Giving to charity can help you too
Many people donate to charity without realising it can also reduce their tax bill. When you give through Gift Aid, the charity claims basic rate tax relief and you can claim the extra relief if you pay higher or additional rate tax.
This reduces the amount of income taxed at higher rates and can even help bring your adjusted net income down. That can be particularly helpful if your income sits around the £100,000 mark, where the personal allowance starts to disappear.
It’s a rare example of a tax decision that genuinely feels good on every level.
Take a moment to review capital gains
If you have investments or assets that could be sold in the future, now’s a good time to look at them. The capital gains allowance only applies for the current tax year, and once the deadline passes, it can’t be used again.
Realising gains up to the allowance or offsetting gains with losses can reduce future tax bills. Transfers between spouses or civil partners can also be used to share gains more efficiently, provided everything is done properly.
This is an area where careful planning matters, as HMRC rules can be unforgiving if mistakes are made.
Salary sacrifice and workplace benefits
Salary sacrifice arrangements can reduce both income tax and National Insurance when they are set up correctly. Common examples include pension contributions (though this has recently been capped at £2,000 for NI exemption, from April 2029) and electric vehicle schemes.
These steps are normally taken before income is received, so choices may be narrow this late in the tax year. Checking what you already have can still make a difference.
Watch out for the personal allowance trap
One of the most frustrating surprises for high earners is the loss of the personal allowance once income exceeds £100,000. This creates an effective tax rate that feels disproportionately high at 60%!
The good news is that this extra tax can often be reduced, or even avoided. Pension contributions and Gift Aid donations are two common ways to do this, but options like salary sacrifice, ISA planning and timing income can also help. In many cases, a small change before the tax year ends can lead to a much bigger tax saving.
Don’t forget legitimate expenses
For self employed professionals and company directors, claiming all allowable business expenses is essential. This includes professional fees, software, training and use of home costs where appropriate.
While this should happen throughout the year, a final review before accounts are completed can catch items that were missed earlier.
Planning together as a household
Tax planning does not always need to be done in isolation. For couples, moving income‑generating assets to the partner who earns less can help lower the household tax bill. These transfers need to be real and properly recorded, but when done correctly, they are a smart part of long‑term planning rather than a quick fix.
Why the right support matters
High earner tax planning is layered and personal. What works for someone else might not work for you. Make sure your numbers are correct and you understand the rules first.
At Fairview, we believe great financial planning starts with understanding the people behind the numbers. We provide personalised advice that reflects each client’s goals, priorities and life stage, supporting confident financial decisions throughout the year and at tax year end.
A final word
The last few weeks of the tax year are a good moment to pause and check where you stand. It doesn’t need to feel frantic. A simple review can uncover options that are still open to you.
Bolstering your pension, using allowances that would otherwise be lost or making a charitable donation can all make a real difference. Taking a little action now can ease the tax pressure and help you move into the new tax year feeling more in control. Need help? Contact us today for an informal chat about your situation and how we might help.