IHT Update : The SME Squeeze

As of today, 1 April 2026, the landscape of succession planning for UK business owners has fundamentally changed. The most significant reforms to Inheritance Tax (IHT) in over a decade, announced in last November’s Budget, are now in their implementation week. For SME owners and sole traders, these changes introduce a new level of complexity and potential tax exposure that cannot be ignored. The long-standing, unlimited nature of inheritance tax business relief has been curtailed, creating a new set of rules that demand immediate attention and strategic review.

These reforms are a double-edged sword. While they introduce a cap that will catch many successful, growing businesses, they also bring in new provisions for spousal transfers that, if used correctly, can provide significant protection. The key is understanding precisely how this new framework operates and taking proactive steps now to align your succession plan with the new reality.

Unpacking the New Business Relief Rules (Effective 6 April 2026)

The cornerstone of IHT planning for entrepreneurs has always been Business Relief (BR), previously known as Business Property Relief (BPR). For decades, it provided 100% relief from IHT on qualifying business assets, meaning a business of any size could be passed on tax-free.

From 6 April 2026, that unlimited protection is gone. The new system is designed to be, in the government’s words, “fairer and more sustainable,” but for business owners with valuations north of £2.5 million, it represents a new tax liability.

The £2.5 Million 100% Shield: What’s Protected

The good news is that for a significant number of SMEs, full protection remains. The new rules introduce a £2.5 million allowance for combined qualifying business and agricultural assets.

• What it means: The first £2.5 million of your business’s value will continue to benefit from 100% Business Relief.
• Who it helps: If your business valuation, combined with any other qualifying assets like certain unlisted shares or agricultural property, is below this threshold, your direct IHT exposure on those assets remains zero.

This “100% Shield” ensures that smaller family businesses can still be passed down to the next generation without being broken up to pay an IHT bill. However, it’s the assets above this line where the squeeze begins.

The 50% Cliff Edge: The Tax on Growth

For any qualifying business assets valued above the £2.5 million threshold, the rate of relief is reduced to 50%. This doesn’t mean you pay 50% tax. It means that half of the value above the threshold becomes exposed to the standard 40% rate of IHT.

This creates an effective tax rate of 20% on the excess value.

Let’s look at a practical example:

• Your Business Valuation: £4,000,000
• First £2,500,000: Covered by the 100% Shield. Relief is £2,500,000. Taxable value is £0.
• Remaining Value: £1,500,000 (£4m – £2.5m)
• Relief on Remainder: 50% of £1,500,000 = £750,000 relief.
• Taxable Portion: The other 50%, £750,000, is now exposed to IHT.
• IHT Due: 40% of £750,000 = £300,000.

Under the old rules, the IHT on this £4 million business would have been zero. The new framework creates a substantial tax liability that your estate must find the cash to pay.

To see the impact clearly, let’s compare the old and new regimes at different valuation points.

[outrise_compare cols=”3″]
Business Asset Value | IHT Liability (Before 6 April 2026) | IHT Liability (From 6 April 2026)
£2,000,000 | £0 | £0
£3,500,000 | £0 | £200,000
£5,000,000 | £0 | £500,000
£10,000,000 | £0 | £1,500,000
[/outrise_compare]

As the table shows, the tax liability for growing businesses escalates quickly once the £2.5 million threshold is breached.

Maximising Relief: Spousal Transfers and Strategic Planning

The introduction of the cap is a significant challenge, but the legislation also provides a powerful new tool for married couples and those in civil partnerships: full transferability of the £2.5 million allowance.

The Power of Two: The £5 Million Spousal Allowance

Unused portions of an individual’s £2.5 million Business Relief allowance are now fully transferable to their surviving spouse or civil partner.

• How it works: If the first spouse to pass away uses none of their £2.5 million allowance (perhaps because they held no business assets or left them to their spouse, which is IHT-exempt anyway), their full £2.5 million allowance can be claimed by their surviving partner’s estate.
• The Result: This effectively creates a combined, transferable allowance of up to £5 million for a couple.

This makes joint planning and Will structuring more critical than ever. Simply assuming the assets will pass tax-free is no longer a viable strategy. Your Will must be updated to ensure you can take full advantage of this new transferability.

A Critical Warning for AIM-Listed Share Portfolios

A major casualty of these reforms is the treatment of shares listed on the Alternative Investment Market (AIM). Previously, many qualifying AIM shares could benefit from 100% Business Relief after being held for two years, making them a popular tool for IHT planning.

This has been drastically changed.

• The New Rule: From 6 April 2026, relief for AIM-listed shares is reduced to a flat 50% for their entire value.
• No £2.5m Allowance: AIM shares do not get access to the £2.5 million 100% Shield. The 50% relief applies from the very first pound.

This means any qualifying AIM portfolio now carries an effective 20% IHT rate. An investor holding £500,000 in an AIM IHT portfolio, which would have been entirely tax-free last week, now faces a potential IHT bill of £100,000 (50% of the value, £250,000, taxed at 40%). This requires an immediate review of any investment strategy that relies heavily on AIM for IHT mitigation.

The Silent Squeeze: Why Frozen Thresholds Matter More Than Ever

While the changes to Business Relief grab the headlines, another, quieter change is compounding the pressure on estates: the extended freeze on personal IHT thresholds.

Understanding Fiscal Drag in 2026

The government confirmed in the November 2025 Budget that the core IHT thresholds will remain frozen until at least April 2031.

• Nil-Rate Band (NRB): Frozen at £325,000.
• Residence Nil-Rate Band (RNRB): Frozen at £175,000.

This policy is known as “fiscal drag.” As inflation causes the value of your assets—your business, your property, your investments—to rise over time, these static, frozen thresholds protect a progressively smaller proportion of your estate’s real value. More and more of your estate is “dragged” over the threshold and into the 40% tax bracket. You can find the latest information on these thresholds on the GOV.UK Inheritance Tax page.

How the Squeeze Impacts Your Business

The combination of fiscal drag and the new BR cap creates a perfect storm for SME owners.

1. Rising Business Value: Your hard work grows your company’s valuation.
2. Frozen Personal Allowances: The fixed £325k NRB and £175k RNRB cover less of your non-business and personal assets (like your home).
3. Capped Business Relief: Your business value eventually exceeds the new £2.5m BR Shield.

The result is that your estate is being squeezed from two directions. More of your personal wealth falls into the IHT net, and now, the growth of your business creates its own direct tax liability.

On the Horizon: Pensions, Payments, and Your Next Steps

The reforms don’t stop here. The government has also signposted a major change to pensions and provided a concession on how IHT bills are paid.

The End of an Era: Pensions Enter the IHT Net (From April 2027)

For years, unspent pension pots have been a highly effective IHT planning tool, typically sitting outside the estate. This is set to change.

From 6 April 2027, unspent pension funds and any resulting death benefits will be brought within the scope of Inheritance Tax.

While this change is still a year away, it requires immediate long-term planning. The strategy of maximising pension contributions to shield wealth from IHT will no longer be effective from next year. You have a 12-month window to factor this into your retirement and estate planning.

A Welcome Reprieve: Interest-Free IHT Instalments

Recognising that the new BR cap could create a liquidity crisis for beneficiaries—forcing them to sell business assets to pay the tax bill—the government has introduced a key concession.

The existing option to pay IHT on certain assets, like a business, in ten equal annual instalments is now interest-free.

This is a significant benefit. Previously, HMRC charged interest on these outstanding payments, adding to the financial burden. Making the instalments interest-free provides vital breathing room for your beneficiaries, allowing them to manage the tax payment from company profits or other sources over a decade, rather than being forced into a fire sale of the business you built.

Your Immediate Action Plan: A 4-Step Checklist for Q2 2026

With these changes now live, inaction is not an option. Here is what you should be doing this quarter.

1. Get an Accurate Business Valuation: “Back of the envelope” calculations are no longer sufficient. You need a formal, defensible valuation of your business to understand whether you are near or over the £2.5 million threshold. This figure is the bedrock of your entire IHT strategy.
2. Review Your Will and Lasting Powers of Attorney (LPAs): Your Will is the primary legal tool for directing your assets. It must be updated to reflect the new spousal transferability rules for the BR allowance. Without explicit instructions, your estate may not be able to claim the full £5 million potential allowance.
3. Analyse Your Shareholder Agreements: If you have business partners, how does this affect your arrangements? Buy-and-sell agreements often use life insurance to provide liquidity for the surviving partners to buy out a deceased partner’s shares. Is the level of cover still adequate to handle both the share purchase and a potential IHT bill on the deceased’s estate?
4. Re-evaluate Your Investment Portfolio: If you hold a portfolio of AIM shares specifically for IHT planning, its effectiveness has been halved overnight. You must review this with your financial advisor to determine if it remains a suitable investment or if alternative strategies are now more appropriate.

The IHT landscape has been redrawn. For SME owners, this is a pivotal moment that requires a shift from passive reliance on unlimited reliefs to proactive, strategic estate planning.