What Is Inheritance Tax? A Plain-English Guide

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Let's be honest — nobody wakes up excited to learn about inheritance tax. But if you own a property company, or you've built up any kind of wealth, this is one of those things that's genuinely worth understanding. Because the consequences of ignoring it can be enormous.

So here's the plain-English version. No jargon. No legalese. Just the stuff that actually matters.

The basics

Inheritance tax (IHT) is a tax on your estate — everything you own — when you die. It's charged at 40% on the value above certain thresholds.

Think of it this way: the government takes its cut before your family gets theirs.

Now, most people have heard of IHT. But most people also assume it won't affect them. "That's for millionaires," they think. The problem is, if you own a home and a property company, you probably are a millionaire on paper — even if you don't feel like one.

The nil rate band — your tax-free allowance

Everyone gets a tax-free allowance called the nil rate band. It's currently £325,000. It's been frozen at that level since 2009 — yes, nearly two decades — and it's staying frozen until at least 2030.

If your estate is worth less than £325,000, there's no IHT to pay. Simple.

But let's be realistic. If you own a property portfolio in a limited company, your estate is almost certainly worth more than that. Probably a lot more.

The residence nil rate band

There's a second allowance called the residence nil rate band (RNRB), worth up to £175,000. This applies when you leave your main home to your children or grandchildren.

So in theory, an individual can pass on up to £500,000 tax-free (£325,000 + £175,000).

For a married couple, the unused allowances can transfer to the surviving spouse. That means a couple can potentially pass on up to £1,000,000 before IHT kicks in.

Sounds generous — until you add up the family home and a property company worth £1.5m or more. Suddenly that £1m allowance doesn't go very far.

How the 40% rate works

Everything above your available allowances is taxed at 40%. Let's look at what that actually means.

When does IHT get paid?

Here's the bit that catches people off guard. IHT is due within six months of the date of death. And it usually has to be paid before probate is granted — which means before the family can access the estate's assets.

For a family whose wealth is tied up in property company shares, this creates a real problem. You can't easily sell shares in a private company. The properties might take months to sell. Meanwhile, HMRC wants its money.

In practice, this often means the family has to borrow against the estate, sell properties at below market value, or use personal savings to fund the tax bill. None of those options are ideal.

What counts as part of your estate?

Pretty much everything:

• Your home
• Savings and investments
• Shares in companies — including private property companies
• Life insurance policies (unless written in trust)
• Personal possessions of significant value
• Any gifts made within the last 7 years

The one that surprises most property investors is the company shares. You might think, "The properties are owned by the company, not by me." And that's true. But you own the company. And the value of your shares in that company is part of your estate.

Why property company owners get hit hardest

If you ran a trading business — a shop, a consultancy, a manufacturing firm — your shares might qualify for Business Property Relief (BPR), which can reduce the IHT on those shares to zero.

But property investment companies are specifically excluded from BPR. HMRC considers them "investment holding companies," not trading businesses. So the full value of your shares sits in your estate, exposed to 40% IHT.

This is the trap that catches thousands of property investors. They incorporated to save income tax and mortgage interest. It was good advice at the time. But nobody mentioned the inheritance tax bill that was building up on the other side.

Can you reduce your IHT bill?

Yes — and there are several legitimate ways to do it. The right approach depends on your situation, but common strategies include:

• Restructuring your shareholdings to create minority holdings and move value out of your estate
• Using trusts to hold shares for the benefit of your children
• Making lifetime gifts that fall out of your estate after 7 years
• Life insurance written in trust to cover the potential tax bill

The important thing is that none of these are loopholes or aggressive tax schemes. They're well-established principles in UK tax law, used by families across the country.

But they do take time to set up, and the sooner you start, the more effective they are — particularly anything involving the 7-year rule.

The cost of doing nothing

This is the bit that's hardest to hear. If you do nothing, the maths is simple: 40% of everything above your nil rate bands goes to HMRC. For a property company worth £1.5m, that could easily be £400,000 or more.

That's money your family could have kept — if someone had taken the time to restructure things properly.