Understanding how inheritance tax affects married couples is crucial for protecting your family’s financial legacy. Many couples fail to claim valuable tax allowances that could protect thousands of pounds. The good news is that married couples can combine allowances to pass on up to £1 million tax-free, but this requires proper planning and awareness of current rules.
This guide explains inheritance tax for married couples, highlights available exemptions, and shows you how to maximise protection for your estate.
What Is Inheritance Tax?
Inheritance Tax (IHT) is a UK tax charged on the value of a person’s estate when they die. HMRC calculates it based on the total value of assets left behind after applying any available allowances, reliefs, and exemptions. Not all estates are subject to inheritance tax; rather, it only applies when the total value of the assets exceeds the particular tax-exempt thresholds set by law.
An estate is more than just cash in the bank. It includes all assets owned personally by the individual at the time of death. This can also include certain assets that are legally transferred or gifted before death, depending on timing and rules set by HMRC.
What an estate includes
A taxable estate typically covers:
• Residential property and land in the UK or abroad
• Cash held in current accounts, savings accounts, or deposits
• Investments such as shares, funds, and ISAs
• Business interests, including shares in a private limited company
• Personal possessions such as jewellery, vehicles, and valuable collections
• Certain lifetime gifts, especially those made within seven years of death
What Is Inheritance Tax for Married Couples?
Inheritance tax is a tax charged on the estate of someone who has died. Your estate includes property, bank accounts, investments, business assets, and personal possessions. HMRC charges this tax at 40% on the value of an estate above the tax-free threshold.
However, married couples and civil partners benefit from a significant exemption. Anything you leave to your spouse or civil partner is completely tax-free, regardless of value. This spouse exemption is unlimited and represents one of the most powerful tax allowances available.
The key difference for married couples is that you can combine your unused tax allowances. When one spouse dies and leaves everything to the surviving spouse, their unused allowances transfer across. This means your surviving spouse can benefit from both sets of allowances when they later pass away.
The Core Tax Thresholds You Need to Know
The Nil-Rate Band
Everyone gets a personal allowance of £325,000, with no inheritance tax charged on estates worth up to this amount. This threshold has been frozen since 2009 and is set to remain at £325,000 until at least April 2031.
For a married couple, this means each person has a £325,000 allowance. If structured correctly, you can protect £650,000 combined from inheritance tax through these personal allowances alone.
The Residence Nil-Rate Band
An additional allowance, known as the residence nil-rate band, may also apply when a main residence is passed to direct descendants such as children or grandchildren. This provides up to £175,000 per person and is also transferable between spouses.
When both allowances are available in full, a married couple can potentially pass on up to £1 million free of inheritance tax. This is calculated as £325,000 plus £175,000 per person, giving a combined total of £500,000 each, or £1 million per couple. However, this is subject to conditions, particularly around the property and estate value.
(Source: Inheritance Tax nil-rate band, residence nil-rate band from 6 April 2028)
How Married Couples Maximise Their Exemptions
Married couples and civil partners can significantly reduce inheritance tax exposure when they use exemptions and allowances together rather than individually. Crucially, the focus should be on the long-term interplay of reliefs across both estates, rather than solely considering the situation at the time of the initial passing.
The Spouse Exemption
The spouse exemption is one of the most valuable inheritance tax reliefs available. Anything you leave to your spouse or civil partner is exempt from inheritance tax, regardless of the amount.
Many couples rely on this exemption alone, leaving their entire estate to their surviving spouse. While this prevents any inheritance tax on the first death, it only delays the tax liability. When the surviving spouse eventually dies, their estate must pay tax on the combined value if it exceeds the available allowances.
This is why sole reliance on the spouse exemption is not the most effective planning. It combines the unused allowances of both spouses into one estate at the second death.
Transferable Allowances
Married couples can transfer any unused portion of their allowances to the surviving spouse. When the first spouse dies and leaves everything to the surviving spouse, their unused allowances transfer to the surviving spouse.
As a result, on the second death, the surviving spouse may benefit from both sets of allowances. This can allow up to £650,000 of nil-rate band protection alone or up to £1 million in total where the residence nil-rate band also applies in full and the family home is passed to direct descendants.
This effectively means the surviving spouse benefits from both individuals’ allowances, significantly increasing the amount that can pass free of inheritance tax, depending on how the estate is structured.
The Residence Allowance for Married Couples
The residence nil-rate band can also be transferred between spouses or civil partners. If the first spouse does not use their full allowance, the unused percentage can be passed to the surviving spouse, increasing the available relief on the second death. This applies where the family home is left to direct descendants, such as children or grandchildren.
However, the residence nil-rate band is subject to a taper for larger estates. If the total estate value exceeds £2 million (before reliefs and exemptions), the allowance is reduced by £1 for every £2 above this threshold. Once the estate reaches £2.35 million, the residence nil-rate band is fully withdrawn.
This taper applies to individuals and married couples alike and is based on the total estate value, not the amount actually inherited or the tax due.
(Source: Inheritance Tax nil-rate band, residence nil-rate band)
UK Inheritance Tax Allowance 2026/27
Understanding the available inheritance tax allowances is essential for effective estate planning. Although the core thresholds remain unchanged for the 2026/27 tax year, recent government reforms mean many families, business owners, and property investors need to review their plans sooner rather than later.
The government has confirmed that the main inheritance tax thresholds will remain frozen until at least 2027/28. While this provides certainty, it also means more estates are being drawn into the inheritance tax system as property prices and asset values continue to rise.
Current inheritance tax allowances
The main inheritance tax allowances for 2026/27 are:
|
Allowance |
Amount |
|
Nil Rate Band (NRB) |
£325,000 |
|
Residence Nil Rate Band (RNRB) |
£175,000 |
|
Maximum Individual Allowance |
£500,000 |
|
Maximum Married Couple Allowance |
£1,000,000 |
(Source: Inheritance Tax nil-rate band, residence nil-rate band from 6 April 2028)
The Nil Rate Band is the amount that can pass free of inheritance tax before any tax becomes payable.
The Residence Nil Rate Band provides an additional allowance where a qualifying family home passes to direct descendants, such as children or grandchildren.
For married couples and civil partners, unused allowances can usually transfer to the surviving spouse. This means a couple may potentially pass up to £1 million free from inheritance tax when all conditions are met.
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Business and Agricultural Relief Changes from April 2026
One of the most significant inheritance tax reforms affects Business Property Relief (BPR) and Agricultural Property Relief (APR).
From 6 April 2026, qualifying business and agricultural assets will benefit from 100% relief only up to a combined limit of £2.5 million per individual. Any qualifying value above this threshold will receive only 50% relief, rather than full exemption.
For married couples, each spouse has their own £2.5 million limit, creating a potential combined relief of £5 million where ownership is structured appropriately.
This impacts farming families, business owners, and landlords. If your estate includes business shares, agricultural land, or a significant property portfolio, review your structures now.
Pensions and Inheritance Tax from April 2027
From 6 April 2027, most unused pension funds and death benefits will be brought within the value of a person’s estate for inheritance tax purposes.
Currently, defined-contribution pensions sit outside your estate for inheritance tax, making them tax-efficient wealth transfer vehicles. HMRC estimates around 10,500 estates will become liable for inheritance tax for the first time as a result of the pension change.
The spouse exemption remains unchanged. Pension benefits transferred to a surviving spouse or civil partner will generally continue to qualify for the inheritance tax exemption.
Inheritance Tax Planning for Married Couples
Effective inheritance tax planning involves more than simply relying on spouse exemptions and available allowances. A proactive approach can help reduce future inheritance tax liability and preserve more wealth for future generations.
Review Your Will Regularly
An up-to-date will is essential for tax-efficient estate planning. Major life events can significantly affect how your estate is taxed.
Review your will after you get married or divorced, after the birth of children or grandchildren, after buying property and after major changes in your business.
Business owners should also align their inheritance tax planning with succession plans to ensure a smooth transfer of assets.
Structuring Your Estate Correctly
Rather than leaving your entire estate to your spouse, consider leaving your personal allowance (£325,000) to other beneficiaries, such as children. Your spouse then inherits both their own allowance and yours through the transfer mechanism.
This approach uses both allowances at the first death rather than concentrating them into the surviving spouse’s estate.
Using Lifetime Gifting
Gifts made during your lifetime can affect your inheritance tax bill depending on how long you survive after giving the gift. Gifts become completely exempt if you survive seven years. Smaller gifts may be exempt immediately.
Married couples can gift together to multiply their gifting capacity. Each spouse can make independent gifts, doubling the amount you protect each year.
The Seven-Year Rule
Larger gifts outside the standard exemptions become exempt from inheritance tax if you survive seven years. This is a powerful planning tool for couples with significant assets. Start gifting early to take full advantage of this timeframe.
Annual Exemption Strategy
Each person can make smaller gifts of up to £250 per person each tax year without using their main allowance. Married couples can each use this exemption, protecting £250 multiplied by the number of beneficiaries every year.
Consider Business Relief
Business owners should regularly review whether their assets qualify for business relief.
Although qualifying business assets can still benefit from inheritance tax relief, changes from April 2026 mean relief is no longer unlimited for larger estates. Directors, shareholders, and family business owners should review their succession and estate plans to ensure they remain tax-efficient.
Consider Trusts Carefully
Trusts can be helpful for long-term succession planning, managing the distribution of assets, and safeguarding family wealth.
However, trust taxation is complex, and professional advice should be sought before establishing any trust arrangement.
Plan as a Couple
Married couples can often maximise inheritance tax allowances by coordinating their estate planning, gifting strategies, and asset ownership structures.
Regular reviews become increasingly important as property values rise, business assets grow, and inheritance tax rules continue to evolve.
Common Mistakes Married Couples Make
Even with generous exemptions available, many married couples still end up with avoidable inheritance tax exposure. The issues usually come down to timing, assumptions, or missing key planning steps.
Relying Solely on the Spouse Exemption
Leaving everything to your surviving spouse avoids inheritance tax on the first death. However, it concentrates both estates’ value under one person’s allowances. The second death often triggers a significant tax bill.
Failing to Claim the Transferable Allowance
Executors must actively claim the transfer of unused allowances from HMRC. Many families miss the two-year deadline, losing valuable protection.
Not Planning for the Residence Allowance Taper
Couples with estates approaching or exceeding £2 million often forget about the residence allowance taper. Estates above £2 million lose this £175,000 benefit entirely. A small change in planning could save £70,000 in inheritance tax.
Overlooking Business and Agricultural Assets
If you own a business or farm, you may qualify for relief. However, new caps from April 2026 change the calculation. Structures implemented before the deadline may offer better results than those implemented after.
Ignoring Pension Changes
Many couples treat pensions as inheritance tax-free, assuming this rule continues unchanged. From April 2027, most unspent pensions enter the taxable estate. This could trigger inheritance tax for families previously below the threshold.
Planning for Your Family
Inheritance tax for married couples is complex, but the rules clearly favour proper planning. Married couples can combine allowances to protect up to £1 million tax-free, protecting your family from paying more than necessary.
The spouse exemption provides unlimited protection, but relying on it alone often leads to larger tax bills on the second death. Transferable allowances, the residence nil-rate band, and strategic lifetime gifting all provide additional layers of protection.
Recent policy changes for 2026 and 2027 add urgency to estate planning. Couples with business assets should act before April 2026. All couples should review pension structures before April 2027.
Your estate is likely the largest financial legacy you leave your family. Spending time now to understand inheritance tax for married couples ensures more of that legacy passes to those you care about rather than to HMRC.
