Understanding the tax landscape for high earners

RIFT Roundup:

If you're short on time, here's what you need to know: 

• Earning over £100,000 starts to reduce your Personal Allowance.

• Between £100,000 and £125,140, many people face an effective 60% marginal tax rate.

• Higher earners may need to complete a Self Assessment tax return.

• Pension contributions can help reduce adjusted net income.

• ISAs, pensions and certain investments can improve tax efficiency.

• Understanding the rules early can help you avoid expensive surprises.

What tax do high earners pay in the UK?

For England, Wales and Northern Ireland, the current income tax bands are: 

Tax band	Taxable income	Tax rate
Personal allowance	Up to £12,570	0%
Basic rate	£12,571 to £50,270	20%
Higher rate	£50,271 to £125,140	40%
Additional rate	Over £125,140	45%

One important thing to remember is that these rates apply in layers. 

Moving into a higher tax band doesn't mean all of your income is taxed at the higher rate. Only the portion that falls within that band is taxed accordingly. 

The hidden tax trap between £100,000 and £125,140

This is where many higher earners get caught out. 

Everyone starts with a Personal Allowance, which is the amount you can earn before paying Income Tax. For most people, this is £12,570. 

However, once your adjusted net income exceeds £100,000, your Personal Allowance starts to disappear. 

For every £2 earned above £100,000, you lose £1 of Personal Allowance. 

By the time your income reaches £125,140, your Personal Allowance has been removed entirely. 

Why does this create a 60% tax rate?

Let's imagine you earn an additional £1,000 above £100,000. 

Normally, that £1,000 would be taxed at 40%, creating a tax bill of £400. 

However, that extra income also reduces your Personal Allowance by £500. 

That £500 now becomes taxable too, creating another £200 of tax. 

So on £1,000 of additional earnings:

• £400 tax is paid on the extra income
• £200 tax is paid because part of your allowance disappears 

Total tax: £600 

Effective tax rate: 60% 

This is often referred to as the "60% tax trap" and is one of the biggest planning considerations for people earning over £100,000. 

Do high earners need to complete a self-assessment tax return?

Potentially. 

Historically, people earning over £100,000 were required to submit a Self Assessment tax return. 

The rules have evolved in recent years and whether you need to file now depends on your circumstances rather than salary alone. 

You may still need to complete Self Assessment if you:

• Are self-employed
• Receive rental income
• Have foreign income
• Receive significant dividend income
• Have Capital Gains Tax to report
• Receive Child Benefit and are affected by the High Income Child Benefit Charge
• Are specifically asked to file by HMRC 

If HMRC issues a notice requiring a tax return, it's important not to ignore it. 

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Review your adjusted net income 

Many tax planning opportunities revolve around adjusted net income rather than your headline salary. 

Understanding this figure can help you determine whether you're likely to lose some or all of your Personal Allowance. 

Ways higher earners may reduce their tax bill legally 

There is no magic formula that eliminates tax. 

However, there are several legitimate reliefs and allowances that higher earners often use as part of wider financial planning. 

Pension contributions 

Pension contributions are one of the most common ways people reduce adjusted net income. 

Making additional pension contributions can:

• Support long-term retirement planning
• Potentially reduce exposure to the Personal Allowance taper
• Increase the value of available tax relief 

For some people, this can help preserve part or all of their Personal Allowance. 

ISA allowances 

ISAs remain one of the most tax-efficient savings products available. 

Returns generated within an ISA are generally free from:

• Income Tax
• Capital Gains Tax
• Dividend Tax 

Many higher earners use their annual ISA allowance as part of a broader financial strategy. 

Charitable donations 

Gift Aid donations can also reduce adjusted net income. 

This can be particularly relevant for individuals whose income sits close to key thresholds such as £100,000. 

Salary sacrifice arrangements 

Some employers offer salary sacrifice arrangements for benefits such as:

• Pension contributions
• Electric vehicles
• Cycle to work schemes 

These arrangements can improve tax efficiency depending on your circumstances. 

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Don't focus only on tax rates 

Many higher earners focus on moving between the 40% and 45% tax bands. 

In practice, losing Personal Allowance can often have a bigger financial impact than crossing into the Additional Rate band. 

What about Capital Gains Tax? 

Income isn't the only thing that higher earners need to think about. 

If you sell assets such as:

• Shares
• Investment property
• Valuable possessions 

You may also need to consider Capital Gains Tax (CGT). 

The annual CGT allowance has reduced significantly in recent years, making tax planning more important than it once was. 

If investments form part of your overall financial picture, it's worth understanding how Capital Gains Tax works alongside Income Tax. 

For more detail, see our guide to Capital Gains Tax allowances. 

How Child Benefit can affect higher earners 

One area that often surprises people is the High Income Child Benefit Charge. 

If either parent earns above certain thresholds, some or all of the Child Benefit received may need to be repaid through the tax system. 

This is another reason why understanding adjusted net income is so important. 

For some households, relatively small changes to pension contributions or taxable income can make a meaningful difference. 

What mistakes do higher earners commonly make? 

Some of the most common issues include:

• Not realising Personal Allowance is being reduced
• Ignoring pension contribution opportunities
• Forgetting to declare additional income
• Assuming PAYE means everything is automatically correct
• Missing reporting requirements for investments or property income 

The higher your income becomes, the more important it is to understand how different parts of the tax system connect together. 

How can you stay on top of your tax position? 

You don't need to become a tax expert overnight. 

The most important things are:

• Check your tax code regularly
• Keep records of all income sources
• Understand your adjusted net income
• Review pension contributions annually
• Keep up to date with changes to allowances and thresholds 

A little attention now can help prevent much bigger problems later.

The bottom line 

Earning over £100,000 brings opportunities, but it also introduces parts of the tax system that many people never need to think about. 

Understanding the Personal Allowance taper, the effective 60% tax rate, pension planning and your wider tax position can help you make informed decisions and avoid costly surprises. 

The tax system doesn't become impossible at six figures, but it does become more nuanced. 

The more you understand it, the better placed you'll be to keep more of your money working for you. 

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