Managing a Large Inheritance or Windfall: A Practical Guide

Receiving a large inheritance or financial windfall is one of the most significant financial events most people will ever experience. For some it comes alongside grief. For others it arrives unexpectedly — a deceased relative they barely knew, a life insurance pay-out, or the proceeds of a business sale that exceeded all expectations. Whatever the source, the challenge of managing sudden, substantial wealth is more complex than it appears from the outside.

Research into recipients of large inheritances and lottery windfalls consistently shows that a significant proportion of them reduce their wealth materially within a few years of receiving it. Not through deliberate spending, but through a combination of poorly timed decisions, bad advice, and the psychological pressures of sudden wealth. This guide provides a framework for doing it properly.

The Psychology of Sudden Wealth

Most recipients of an inheritance of £500,000 or more have not previously managed wealth at that scale. They may have been financially comfortable, but the qualitative leap from managing a salary and modest savings to overseeing a seven-figure investment portfolio requires a different set of skills, mindset, and advisers.

Common mistakes in the immediate aftermath of a windfall include:

• Immediate large purchases: a new car, an extended holiday, a property upgrade. Some of these may be appropriate over time, but making them immediately — before the tax position has been assessed and the investment strategy determined — often leads to regret.
• Trusting the wrong people: a sudden windfall can attract attention from those who previously showed little interest. Family disputes over perceived entitlement are common. Unsolicited investment propositions — often fraudulent — spike in volume.
• Making hasty investment decisions: buying a property, funding a friend's business, or putting everything into a single asset class based on a friend's enthusiastic recommendation. These decisions are hard to reverse and often expensive.

The most important thing to do in the first three to six months is nothing dramatic. Park the money in a high-interest cash account or a money market fund (maximising FSCS protection where possible by spreading across institutions), allow the emotional processing of bereavement or shock to settle, and then approach the financial decisions with clarity.

Immediate Steps

Deal with probate and administration. If you have inherited assets from a deceased estate, a solicitor or specialist probate firm will typically handle the administration. Your role as a beneficiary is generally passive during this phase. Ensure, however, that any time-sensitive opportunities or deadlines are identified: in particular, the two-year window for a deed of variation (see below).

Get an accurate inventory. Understanding exactly what you have inherited is the foundation of everything that follows. This means a complete list of all assets — cash, investments, property, pensions, insurance policies — with accurate current values.

Identify time-sensitive decisions. The most important time-sensitive opportunity is the deed of variation. Within two years of the deceased's death, beneficiaries can vary the distribution of the estate for inheritance tax purposes. This can redirect assets to a surviving spouse (to use their NRB and RNRB), to charity (to reduce the estate IHT rate to 36%), or to skip a generation (to reduce the generational IHT burden). If your inheritance included significant assets and IHT planning was not optimal in the original estate, a deed of variation may save the family substantial tax.

The Tax Position

The inheritance itself: no IHT for the beneficiary. Inheritance tax is payable by the estate, not the beneficiary. You pay no tax simply by receiving an inheritance.

Capital gains tax and the rebasing advantage. This is one of the most important and underappreciated tax rules for inheritance recipients. When you inherit an asset — a share portfolio, a property — the base cost for CGT purposes is "rebased" to the probate value at the date of death. Your gain starts from zero on that date. This means that any capital gain that accrued during the deceased's lifetime is entirely extinguished. If the portfolio is worth £1.2m and the original purchase cost was £400,000, the £800,000 gain disappears; you start with a base cost of £1.2m. This is one of the most valuable reliefs in the UK tax system.

Income tax from the date of inheritance. Income generated by inherited assets after the date of inheritance is taxable at your own income tax rates. If you have inherited a rental property, the rental income is subject to income tax from the point the property is legally transferred to you.

Recipients not within the UK IHT net. From 6 April 2025 the UK moved to a residence-based IHT system. An individual is subject to UK IHT on worldwide assets only if they are (or were) a "long-term UK resident" — broadly, UK tax resident for at least 10 of the last 20 tax years. If neither the deceased nor the beneficiary meets that test, and the assets are situated outside the UK, UK IHT may not apply to the foreign-situs portion. The analysis depends on the UK residency history of the deceased, the location of the assets, and any applicable double tax treaty. The old "domicile" test has been replaced — take specialist advice on the residence-based rules if this may apply to you.

Investment Structuring

Don't invest everything at once — or should you? The instinct of most windfall recipients is to phase their investments over time rather than committing a lump sum to markets on a single date. This feels safer. However, the academic evidence is mixed. Vanguard's research ("Dollar-cost averaging just means taking risk later") found that a lump-sum investment outperformed a phased investment strategy in approximately two-thirds of cases over equivalent periods. This is because markets rise more often than they fall, so delaying investment means spending time in cash rather than in growth assets.

The counter-argument is psychological, not financial. For an individual who has never managed wealth at this scale, the regret of watching markets fall immediately after a large lump-sum investment can be deeply damaging — psychologically and behaviourally (panic-selling at the bottom is far worse than any phasing cost). A phased approach over six to twelve months — perhaps quarterly tranches — is a reasonable compromise for those who need the psychological comfort.

Asset allocation and diversification. A large inheritance dramatically changes your overall financial position and therefore your optimal asset allocation. If previously you had modest savings and a defined benefit pension, an inheritance of £1m gives you a very different risk capacity. A full financial planning review — covering your income needs, risk tolerance, time horizon, tax position, and existing assets — should precede any investment decisions.

Wrappers. Maximising tax-efficient wrappers is essential. ISAs (£20,000 per year per person) shelter future income and gains from tax. Pension contributions, where you have earnings, attract tax relief and the pension is outside the estate (until April 2027 for IHT). An offshore bond accumulates income and gains without annual tax drag, with flexibility to draw income at a lower-tax point in the future. Where the sum is large, the investment architecture — which assets sit in which wrappers — may be as important as the underlying asset allocation.

Pension Top-Up Opportunities

A windfall year is often also a lower-income year — perhaps because you have taken time away from work, retired, or are between roles. If you have earnings in the year of inheritance (even modest consultancy income), consider whether there is an opportunity to maximise pension contributions and carry forward unused annual allowances from the previous three tax years. The carry-forward rules allow you to use up to £60,000 per year (based on 2026 limits) of unused allowance from the three prior years, provided you were a member of a registered pension scheme in those years.

However, if your income is low in the inheritance year, the pension contribution provides relief only at the basic rate (20%). A contribution to a stocks and shares ISA may be more efficient for very low-income years, as it shelters future growth without the income tax charge on drawdown that applies to pensions.

Estate Planning Review

A large inheritance often materially increases your own estate. It is therefore essential to update your estate plan post-inheritance:

• Update your will to reflect the changed asset position.
• Review your own IHT position — you may now be significantly above the nil rate band thresholds.
• Consider whether gifting to children or grandchildren (using the seven-year rule, or exempt gifts such as the annual exemption of £3,000 per year and normal expenditure out of income) is appropriate.
• Review the position of any inherited property — if it is not your main residence, it will be subject to CGT on eventual sale (at the rebased value) and may form part of your taxable estate.

A deed of variation can also be used to redirect part of the inheritance directly to grandchildren, bypassing a generation of estate for IHT purposes — a useful planning tool where the beneficiary is themselves already wealthy.

Important Considerations

Tax rules, allowances, and reliefs change. The information in this article reflects the position as at June 2026 and is intended as a general guide only. Nothing here constitutes financial or tax advice, and your specific circumstances — your domicile status, existing assets, family structure, and tax residency — will affect the analysis significantly. Investments can fall in value as well as rise. Seek qualified independent advice before making any significant financial decision in relation to an inheritance.

How Global Investments Can Help

Global Investments provides a structured windfall management service for individuals who have inherited significant wealth or received a large financial windfall. We begin with a comprehensive financial planning review that covers your tax position, existing assets, investment needs, and estate planning objectives. We then work with you to design an investment architecture — covering wrappers, asset allocation, and tax efficiency — that is appropriate for your specific situation. We can also coordinate with specialist solicitors on deeds of variation and estate planning. Contact our team to arrange a private consultation.