How to Legally Reduce Your UK Tax Bill Before the April Deadline?

As the 5th of April approaches, high-net-worth individuals and those with earnings exceeding £100,000 face a familiar, yet often misunderstood, challenge. The conversation around tax reduction is frequently clouded by generic advice or, worse, suggestions that blur the line of compliance. The statutory position is clear: tax avoidance is illegal, but tax planning is a prudent and necessary component of financial management. The UK tax code, while complex, contains explicit mechanisms that permit and even encourage certain behaviours for the efficient management of one’s financial affairs.

The primary issue for this demographic is not the headline 40% or 45% tax rates, but the punitive effective tax rates that arise when income thresholds are crossed. The most notorious of these is the ‘60% tax trap’, where the gradual removal of the personal allowance creates a disproportionate tax burden. Many taxpayers in this bracket are unaware that they are losing £1 of their tax-free personal allowance for every £2 earned over £100,000. This is not a tax, but a withdrawal of a benefit, and it is here that the greatest opportunities for legitimate tax mitigation lie. The objective is not to find obscure loopholes, but to use the existing framework—pensions, allowances, and investment structures—to strategically manage your ‘adjusted net income’ and reclaim what is rightfully yours.

This briefing will not reiterate platitudes. It will provide an authoritative overview of several key, compliant strategies available to high earners. We will dissect the mechanics of pension contributions, inter-spousal transfers, high-risk investment reliefs, and other established methods. The aim is to equip you with the understanding necessary to engage with your financial advisors and make informed decisions to legally and effectively optimise your tax position before the tax year concludes.

This article provides a detailed breakdown of the most effective and compliant strategies available. The following summary outlines the key areas we will explore to help you structure your tax planning ahead of the deadline.

Using unused allowances: How to pay £180k into your pension tax-free?

The single most effective strategy for high earners to reduce their adjusted net income is through pension contributions. While the standard annual allowance limits contributions, the ‘carry forward’ rule provides a powerful, but often underutilised, mechanism for making substantial, tax-efficient injections into your pension pot. The statutory framework allows you to use any unused annual allowance from the three preceding tax years, in addition to the current year’s allowance.

For the current tax year, this means you can utilise the standard £60,000 annual allowance plus any remaining allowance from 2021/22, 2022/23, and 2023/24. Assuming the full allowance was available and unused in those years, an individual could potentially contribute up to £180,000 (£60,000 x 3) plus the current year’s £60,000, for a total of £240,000. For an individual in the 60% tax trap, a significant contribution not only receives tax relief at their marginal rate but also directly reduces their adjusted net income, potentially restoring their full personal allowance.

This process, however, is subject to strict conditions. You must have been a member of a registered pension scheme during the years from which you are carrying forward allowance. Furthermore, your total contributions in a tax year cannot exceed your relevant UK earnings for that year. For very high earners, it is also critical to be aware of the tapered annual allowance, which can reduce the available allowance to as little as £10,000 if your ‘adjusted income’ exceeds £260,000. Precise calculation is therefore paramount.

Marriage allowance: Moving assets to a lower taxpayer to save capital gains?

While the term ‘Marriage Allowance’ typically refers to the ability to transfer a portion of one’s Personal Allowance, a far more potent strategy for married couples or those in a civil partnership involves the inter-spousal transfer of assets to mitigate Capital Gains Tax (CGT). Under UK tax law, transfers of assets between spouses are conducted on a ‘no gain, no loss’ basis. This means no CGT is triggered at the point of transfer; the recipient spouse is deemed to have acquired the asset at the original cost paid by the donor.

This creates a significant tax planning opportunity. A higher-rate taxpayer holding an asset with a substantial unrealised gain can transfer it, in whole or in part, to their basic-rate taxpaying spouse. The basic-rate spouse can then dispose of the asset. This strategy allows the couple to utilise two sets of CGT annual allowances—currently £3,000 per person—effectively doubling the tax-free portion of the gain. Furthermore, any gain above the combined allowances may be taxed at the lower CGT rate of 10% or 18% (for residential property) applicable to basic-rate taxpayers, rather than the 20% or 24% faced by the higher-rate spouse.

The table below illustrates the potential tax saving from such a manoeuvre on a £20,000 gain from a residential property, assuming the basic-rate spouse has sufficient income capacity within their basic rate band.

It is imperative that the transfer is a genuine, outright gift with no strings attached. Any arrangement that seeks to return the proceeds to the original owner could be challenged by HMRC under anti-avoidance provisions. This strategy requires careful implementation and is most effective for couples where there is a clear disparity in income levels and tax bands.

VCTs and EIS: Are the 30% tax breaks worth the high risk?

For high-earners who have fully utilised their pension and ISA allowances, Venture Capital Trusts (VCTs) and the Enterprise Investment Scheme (EIS) present a further tier of tax-efficient investing. These government-backed schemes are designed to encourage investment into small, high-growth, unlisted UK companies. In return for taking on significant risk, investors are offered substantial tax incentives. Both schemes provide up to 30% income tax relief on the amount invested, up to certain limits (£200,000 for VCTs, £1 million for EIS, or £2 million if invested in ‘knowledge-intensive’ companies).

This upfront relief is a powerful tool for reducing a large income tax bill. An investment of £100,000 could generate an immediate £30,000 reduction in tax liability. Furthermore, dividends from VCTs are tax-free, and any capital gains on the disposal of VCT or EIS shares are exempt from CGT, provided the shares have been held for the minimum required period (five years for VCTs, three for EIS). Despite these attractions, and the fact that recent HMRC figures show £881 million was raised in VCTs during the 2024-25 tax year, these are not mainstream investments.

It is legally and ethically imperative to underscore the risks. The underlying investments are in early-stage, unquoted companies, which have a high failure rate. Capital is at risk, and investors could lose their entire investment. As industry experts frequently caution:

VCTs are high-risk, sophisticated investment products that should only be used by those who can afford to lose the money.

– Industry Expert Commentary, IFA Magazine VCT Analysis 2025

Therefore, VCTs and EIS should not be considered as a simple tax-saving product but as a high-risk investment with tax benefits. The decision to invest must be driven by a long-term investment thesis and a capacity for loss, not solely by the tax relief on offer. They are suitable only for sophisticated investors as part of a well-diversified portfolio.

The 7-year rule: How to gift assets now to save 40% tax later?

Inheritance Tax (IHT) is a growing concern for many families as asset values, particularly property, have increased. While official statistics show that only a small percentage of estates are liable, the impact can be substantial for those affected. According to HMRC statistics for 2022-2023, 4.62% of UK deaths resulted in an IHT charge, with total liabilities reaching £6.70 billion. One of the most fundamental estate planning strategies to mitigate this is the use of lifetime gifts, governed by the so-called ‘7-year rule’.

The principle is straightforward: a gift made to another individual is considered a Potentially Exempt Transfer (PET). If the donor survives for seven years after making the gift, its value falls completely outside of their estate for IHT purposes and no tax is due on it. This can result in a tax saving of 40% on the value of the gifted asset. If the donor dies between three and seven years after making the gift, the IHT due on the gift is reduced on a sliding scale known as ‘taper relief’.

For this strategy to be effective, the gift must be absolute. The donor cannot retain any benefit from the asset they have given away (a ‘gift with reservation of benefit’). For example, gifting a house but continuing to live in it without paying a full market rent would render the gift ineffective for IHT purposes. There are annual exemptions that can be used—such as the £3,000 annual gift exemption—which are immediately outside the estate. However, for substantial wealth transfer, PETs are the primary vehicle. This requires long-term planning and is not a last-minute solution, but making such gifts before the tax year end can be a prudent step in a wider estate plan.

Director’s pay: What is the optimal salary/dividend split for 2024?

For directors of limited companies, determining the most tax-efficient method of remuneration is a perennial challenge that has been complicated by recent changes in corporation tax and dividend tax rates. The traditional wisdom of taking a minimal salary (up to the National Insurance threshold) and the remainder in dividends requires a more nuanced assessment in the current tax landscape. The optimal split now depends heavily on the company’s profit level.

The key variables are: the director’s personal tax position, the company’s corporation tax rate, and the reduced allowances for dividends. The tax-free dividend allowance has been cut significantly and now stands at a mere £500 for the 2024-25 tax year. Dividends are paid from post-corporation tax profits. With the main rate of corporation tax at 25% for profits over £250,000, and a marginal rate of 26.5% for profits between £50,000 and £250,000, the tax cost of extracting profits has increased.

In certain scenarios, particularly for companies in the 26.5% marginal corporation tax band, taking a larger salary can be more efficient. Although salary attracts higher rates of income tax and National Insurance, it is a deductible expense for the company, thereby reducing the corporation tax liability. This reduction in corporation tax can sometimes outweigh the personal tax cost of the salary. The following case study illustrates the shift in thinking required.

The optimal strategy is no longer a one-size-fits-all solution. It requires detailed calculations based on the specific profit level of the company and the personal tax circumstances of the director. A review before the tax year end is essential.

Salary sacrifice: The most efficient way to escape the 60% band?

Salary sacrifice is arguably the most direct and efficient mechanism for any employee, particularly a high earner, to mitigate punitive tax rates. The arrangement involves an employee contractually agreeing to give up a portion of their future gross salary in exchange for a non-cash benefit from their employer. The most common and effective form of this is an increased employer pension contribution.

For an individual whose income falls into the bracket where their personal allowance is tapered, salary sacrifice is exceptionally powerful. The income range between £100,000 and £125,140 is where the effective 60% tax rate applies. By sacrificing salary for a pension contribution, the employee’s ‘adjusted net income’ is reduced. If it is reduced to below the £100,000 threshold, the full personal allowance of £12,570 is restored. This not only avoids the 40% income tax on the sacrificed amount but also claws back the personal allowance, effectively providing 60% tax relief.

Furthermore, a salary sacrifice arrangement also results in a saving on National Insurance contributions for both the employee (typically 2%) and the employer (13.8%). Many employers will pass on some or all of their NIC saving to the employee by further boosting their pension contribution, enhancing the overall benefit. While pensions are the most common use, other schemes like cycle-to-work, electric vehicles, or purchasing additional annual leave can also be facilitated through salary sacrifice. However, it is essential to understand the potential downsides. A lower headline salary can affect mortgage affordability calculations, death-in-service benefits, and future redundancy payments. These factors must be carefully weighed before entering into such an agreement.

Investment bonds: When do they become more tax-efficient than ISAs?

For high-net-worth individuals who consistently maximise their primary tax-efficient allowances, the question of “what next?” often arises. After the full £20,000 ISA allowance and the £60,000 pension annual allowance are utilised, investment options with favourable tax treatment become scarcer. This is the specific context in which investment bonds (also known as insurance bonds) become a relevant consideration in a tax-planning hierarchy.

An investment bond is a single-premium life insurance policy where the premium is invested in a fund. Its key tax feature is that the investment fund within the bond grows largely free of tax, and the investor can withdraw up to 5% of the original investment each year for 20 years, tax-deferred. This does not mean it is tax-free; it means the tax liability is postponed until a ‘chargeable event’ occurs, such as cashing in the bond or taking a withdrawal of more than the cumulative 5% allowance.

The strategic value of a bond lies in this tax deferral. A higher-rate or additional-rate taxpayer can use the 5% withdrawals to generate a regular ‘income’ stream during their working life without triggering an immediate tax liability. The overarching strategy is often to delay the main chargeable event until retirement, at which point the individual may have moved into a lower tax bracket (e.g., from a 40% taxpayer to a 20% taxpayer). When the chargeable event does occur, the gain can be averaged over the life of the bond using ‘top-slicing relief’, which can significantly reduce the final tax bill by preventing the gain from pushing the individual into a higher tax band in a single year. Therefore, an investment bond is almost never more tax-efficient than an ISA or a pension; its role is as a tertiary tax-planning tool for those who have exhausted the more generous primary wrappers and require a vehicle for long-term tax-deferred growth.

The 60% tax trap: Strategies to avoid losing your personal allowance?

The ‘60% tax trap’ is one of the most punitive features of the UK personal tax system, yet it remains poorly understood by many who fall into it. It is not an official tax rate but the practical consequence of the tapering of the personal allowance. As per the official tax guidance, the personal allowance is reduced by £1 for every £2 of adjusted net income earned over £100,000. This means that for every £100 of income earned in this band, a taxpayer not only pays £40 in income tax but also loses £50 of their personal allowance, which creates an additional tax liability of £20 (40% of £50). The total tax hit is therefore £60 for that £100 of income—an effective rate of 60%.

This tapering continues until the entire personal allowance is eliminated at an income level of £125,140. Escaping this trap is a matter of ‘threshold engineering’—taking deliberate, compliant steps to ensure your adjusted net income falls below the £100,000 trigger point. The primary strategies discussed throughout this briefing—such as making significant pension contributions via personal payment or salary sacrifice, or making Gift Aid donations to charity—all serve this purpose. By reducing your income on paper, you can fully restore your personal allowance and sidestep the 60% cliff edge entirely.

With the tax year end fast approaching, the window for action is closing. The following checklist outlines a prioritised plan for individuals who find themselves approaching or within this income band.

The approaching April deadline necessitates a decisive review of your tax position. These strategies are not theoretical; they are practical, compliant tools available within the current legislative framework. To protect your earnings and reclaim lost allowances, the time for strategic action is now.