King Charles's tax bill could be published this week alongside other financial reports, The Guardian has reported. On 25 June 2026, the King could become the first reigning monarch to disclose how much tax he pays.
But should landlords and property investors care about the King's tax arrangements? Yes, not because the same rules apply to them, but because they highlight how Inheritance Tax (IHT) works, who qualifies for exemptions, and why proper estate planning can make a substantial difference to the amount your family gets.
In this article, we explain what King Charles's tax bill can tell us about IHT and the lessons ordinary taxpayers can take from the Sovereign’s tax information.
Key Takeaways
- King Charles III could publish his personal tax bill for 2024/25 on 25 June 2026
- This would make him the first reigning monarch to reveal their personal tax information
- The monarch pays Income Tax and Capital Gains Tax voluntarily under the 1993 Memorandum of Understanding on Royal Taxation (updated July 2023)
- The sovereign pays no Inheritance Tax on assets passing monarch-to-monarch
- Ordinary estates generally pay Inheritance Tax at 40% above the £325,000 nil-rate band, with an additional residence nil-rate band of up to £175,000 available where qualifying conditions are met (IHTA 1984 s.7)
- From 6 April 2026, the first £2.5 million of qualifying Agricultural Property Relief and Business Property Relief assets can qualify for 100% relief, and any unused allowance is transferable between spouses and civil partners, potentially allowing up to £5 million of qualifying assets to pass free of Inheritance Tax
What Will King Charles’s Tax Bill Contain?
As reported by The Guardian, King Charles's tax bill will include his total personal tax information for the 2024/25 financial year. The figures could be published alongside the royal household's annual financial reports on 25 June 2026.
Buckingham Palace has confirmed that this will make the King the first reigning British monarch to disclose his personal tax bill. The Palace has framed the move as a step to enhance the clarity and accessibility of royal finances.
The King's private income may include returns from investments, private savings, the Balmoral and Sandringham estates, and income from the Duchy of Lancaster, which generated £26.8 million in 2024/25. Under the Memorandum of Understanding on Royal Taxation 2023, King Charles III voluntarily pays Income Tax on his private income and Capital Gains Tax (CGT) on relevant assets.
Does King Charles III Pay Tax & On What?
Yes, King Charles III does pay tax, but he does so voluntarily. British monarchs have no legal requirement to pay Income Tax, Capital Gains Tax or Inheritance Tax. Since 1993, the Sovereign and the heir have chosen to pay Income Tax and CGT at statutory rates on private income and gains.
This voluntary arrangement is set out in the Memorandum of Understanding on Royal Taxation, first agreed in 1993 and updated in July 2023. Under that agreement, the King pays Income Tax on private income and Capital Gains Tax on relevant gains. He also makes voluntary Inheritance Tax payments in certain circumstances, although transfers of assets from one sovereign to the next remain exempt.
One of the King's largest sources of income is the Duchy of Lancaster, a private estate that generated a net surplus of approximately £26.8 million in 2024/25. He also receives income from private investments, savings and personal estates such as Balmoral and Sandringham. By contrast, the Sovereign Grant, which funds the official duties of the monarchy, is not treated as personal income and is therefore not subject to personal taxation.
The distinction between these income sources is summarised below:
Source | What It Is | Taxation Status |
|---|---|---|
Sovereign Grant | Public funding for official duties; linked to Crown Estate profits | Not taxed. This is regarded official rather personal income |
Privy Purse / Duchy of Lancaster | Private estate income (£26.8 million net in 2024/25) | Income Tax on the portion not used for official purposes |
Personal Wealth | Investments, Balmoral, Sandringham, savings | Income Tax and Capital Gains Tax under the voluntary arrangement |
Does King Charles Pay No Inheritance Tax?
King Charles does not pay Inheritance Tax on assets passing directly from one sovereign to the next. This means that when Queen Elizabeth II died in September 2022, private royal assets such as Balmoral and Sandringham passed to him without an Inheritance Tax charge.
This treatment is based on long-standing UK government arrangements for the monarchy, first established in 1993 and reflected in later updates to the Royal Taxation framework. These arrangements ensure that assets transferred between sovereigns are not subject to Inheritance Tax, even though no specific exemption for the monarch is written into the Inheritance Tax Act (IHTA) 1984.
Because the exemption is based on agreement rather than statute, it exists as a matter of policy rather than primary legislation. In theory, it could therefore be reviewed or changed by a future government.
The policy was introduced to prevent large parts of the sovereign’s private estate from being reduced by taxation when passed down through successive generations of the monarchy.
"The sovereign-to-sovereign Inheritance Tax exemption is a matter of government policy, not primary legislation. It is set out in the Royal Taxation Memorandum of Understanding rather than the Inheritance Tax Act 1984."
Why Should This Concern Your Estate?
The Crown operates under a unique taxation arrangement that does not apply to ordinary taxpayers. What does apply is Inheritance Tax, which applies at 40% on the value of an estate above the £325,000 nil-rate band (IHTA 1984 s.7). A residence nil-rate band of up to £175,000 may also apply where a qualifying home is passed to direct descendants.
Both allowances are frozen until 5 April 2031, as confirmed in the 2025 Autumn Budget. As property values continue to rise without thresholds rising in line with them, more estates are brought within the scope of Inheritance Tax.
Where planning is available, a married couple may be able to combine nil-rate bands and residence nil-rate bands to pass on up to £1 million tax-free, but only where all qualifying conditions are met and the residence nil-rate band is not reduced.
That relief is not fixed in full. The residence nil-rate band is reduced by £1 for every £2 that an estate exceeds £2 million and is withdrawn entirely once the taper limit is reached.
The position becomes more complex at higher estate values. When testing the £2 million threshold for tapering purposes, certain reliefs, including Business Property Relief and Agricultural Property Relief, are not taken into account. As a result, estates with significant property or business assets can still be brought within scope even where reliefs apply to parts of the estate.
Worked Example: How a £1.8 Million Property Estate Becomes Taxable
Consider a widowed landlord who owns a £600,000 main residence and a £1.2 million Buy-to-Let portfolio, leaving her entire estate to her children.
This example assumes:
- Full availability of the nil-rate band and any transferable unused spouse allowance
- Availability of the residence nil-rate band in full
- Main residence qualifies and is left to direct descendants
- No lifetime gifts, trusts, or additional reliefs outside those stated
- No tapering applies
Inheritance Tax is charged at 40% on the value of an estate above the available nil-rate band. The nil-rate band is £325,000 per individual and may be transferable where unused by a pre-deceased spouse.
An additional residence nil-rate band of up to £175,000 may apply where a qualifying home is passed to direct descendants. In this example, the relief is assumed to be fully available.
Step | Amount |
|---|---|
Total Estate | £1,800,000 |
Nil-Rate Band (Individual + Transferred Spouse Allowance) | (£650,000) |
Residence Nil-Rate Band | (£175,000) |
Taxable Estate | £975,000 |
Inheritance Tax at 40% | £390,000 |
This produces an estimated Inheritance Tax liability of £390,000.
In practice, the outcome for any real estate depends on how much of the estate actually qualifies for reliefs and allowances, whether the residence nil-rate band is reduced or withdrawn due to estate value, and whether any prior planning, gifts, or exemptions apply.
The IHT liability is determined by statutory rules under the Inheritance Tax Act 1984 and associated relief provisions.
The 2026 Relief Change Property Investors Must Not Miss
From 6 April 2026, Agricultural Property Relief (APR) and Business Property Relief (BPR) are subject to a new cap on the amount of qualifying assets that can receive 100% relief. This change was confirmed on 23 December 2025 and enacted in the Finance Act 2026.
Under the new rules, the first £2.5 million of combined qualifying agricultural and business property per person can still benefit from 100% relief. This allowance is transferable between spouses and civil partners, meaning a couple may potentially shelter up to £5 million of qualifying assets at the full relief rate.
Any qualifying value above the cap does not lose relief entirely, but instead receives 50% relief. In practice, this produces an effective Inheritance Tax rate of 20% on the excess above the allowance.
In real terms, this change is less about removing relief and more about limiting how much value can benefit from it at the full 100% rate. Residential Buy-to-Let property is generally not within the scope of BPR, as HMRC typically treats it as an investment activity rather than a trading business. As a result, many landlords were never within the relief in the first place, although mixed or trading-style structures may require closer review.
The impact is most significant for those holding genuine trading businesses, qualifying agricultural land, or diversified estates where APR or BPR has historically applied. Where total qualifying assets exceed the £2.5 million per-person cap, the excess will now be subject to the reduced 50% relief hearing.
Conclusion
With the nil-rate bands frozen to 2031, a property portfolio that felt comfortably under the threshold a few years ago may now face a six-figure inheritance tax charge. The lawful tools that reduce it (trusts, lifetime gifting within the seven-year rule, ownership restructuring, and relief planning) need to be in place before death, not after.
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FAQs
No. He is not legally required to pay tax, but he does so voluntarily on his private income under agreements with the UK Government.
The exact figure will be published on 25 June 2026 with the royal household accounts. He pays Income Tax on the private portion of his Duchy of Lancaster income (a £26.8 million net surplus in 2024/25) and on personal investments, plus Capital Gains Tax on relevant private gains.
There is no fixed amount. Senior royals pay tax on their private income under voluntary arrangements, but the exact figures are not publicly disclosed.
The monarch is not “exempt” in the normal legal sense. Instead, they are not subject to Income Tax or Capital Gains Tax as a matter of constitutional principle and historic legal doctrine. In practice, the Sovereign voluntarily pays these taxes on private income under agreements with the UK Government, rather than being required to do so by statute.
The nil-rate band is £325,000 per person, with a residence nil-rate band of up to £175,000 where a qualifying home passes to direct descendants. Both are frozen until 5 April 2031. Estates pay 40% on value above the available threshold.
The sovereign-to-sovereign exemption applies to the reigning monarch. Income passing to the Prince of Wales via the Duchy of Cornwall is structured differently; he voluntarily pays Income Tax on it. Assets he leaves to anyone other than the next monarch fall within the normal Inheritance Tax rules.
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