Here's a conversation that plays out thousands of times across the UK, usually around a kitchen table. A couple in their mid-fifties, maybe early sixties, have built a decent property portfolio. Ten, twelve, maybe fifteen buy-to-let properties, all held in a limited company. Their accountant set it up years ago — said it would save them tax. And it did.
But somewhere along the way, nobody mentioned the inheritance tax bill that was quietly building up on the other side.
How you got here
Most property investors incorporate for perfectly sensible reasons. After the Section 24 changes in 2017, mortgage interest relief on personally held properties was gradually stripped away. Higher-rate taxpayers were suddenly paying income tax on rental income they hadn't actually received — because the mortgage interest could no longer be fully deducted.
A limited company, on the other hand, can still deduct mortgage interest in full. Corporation tax is lower than personal income tax. And you can retain profits in the company, reinvest, and only take money out when you choose to.
It was — and still is — a smart move for income tax purposes. Your accountant gave you good advice.
The problem is on the estate planning side. And most accountants, understandably, are focused on the here and now — this year's tax return, this year's corporation tax. The inheritance tax issue is a future problem. Until suddenly it isn't.
The problem nobody mentioned
When you own properties through a limited company, you don't technically own the properties. The company does. What you own are shares in the company.
And those shares? They're part of your estate. The full value. Subject to 40% inheritance tax when you die.
"But wait," you might think. "I own a business. Don't business owners get a relief for that?"
They do. It's called Business Property Relief (BPR), and it can reduce the IHT on business shares to zero. It's a generous relief — if you qualify.
Property investment companies don't qualify.
Why BPR doesn't help you
HMRC draws a clear line between trading companies and investment holding companies. A trading company does something — it manufactures products, provides services, runs a shop. An investment holding company holds assets (like property) and collects income (like rent).
Property investment companies fall squarely on the investment side. Even if you actively manage the portfolio — dealing with tenants, handling maintenance, negotiating with letting agents — HMRC's view is that collecting rent is not trading. It's investing.
No BPR means the full value of your shares is exposed to IHT at 40%.
Richard and Carol own a property company with 14 buy-to-let flats worth £2.1m in total, with £600,000 of outstanding mortgages. The company's net asset value is £1.5m.
They each hold 50% of the shares. On second death, the full £1.5m is in the estate. After nil rate bands, the IHT exposure could be £200,000 to £400,000 depending on their other assets.
That's money their two daughters would need to find — potentially before they can even access the estate.
The scale of the problem
Let's put some rough numbers on this. If your property company is worth £1m net of mortgages, and you haven't done any IHT planning, you're looking at a potential tax bill of around £200,000 to £400,000 — depending on your other assets and available nil rate bands.
At £2m, it could be £500,000 or more.
And here's the really uncomfortable bit: HMRC wants that money within six months of the death. Before probate. Before anyone can sell the properties. Before the estate has been sorted out.
Where does the money come from? Often, it means selling properties quickly — at below market value — or borrowing against the estate. Neither option is what you'd want for your family.
Why this catches smart people out
The people who own property companies tend to be financially aware. They have accountants. Some have financial advisers. They've made good decisions about income tax, corporation tax, and portfolio management.
But IHT planning falls between the cracks. Your accountant handles the annual accounts and tax returns — they're not usually thinking about what happens in 20 years. Your financial adviser (if you have one) might handle pensions and ISAs but might not get into the detail of company restructuring.
And the longer you leave it, the bigger the problem gets. Property values go up. Mortgages get paid down. The net value of your shares keeps growing — and with it, the eventual IHT bill.
It doesn't have to be this way
The good news is that there are legitimate, well-established ways to reduce the IHT exposure on property company shares. They involve restructuring the shareholdings — not selling properties, not closing the company, and not changing how the business operates day to day.
The key approaches include creating new share classes, bringing family members in as shareholders, using trusts for younger children, and transferring shares as potentially exempt transfers that fall out of your estate over time.
None of this is aggressive tax avoidance. It's standard estate planning, used by thousands of families. But it does need to be set up properly, with the right legal work, and ideally sooner rather than later.
The bottom line: If you own shares in a property investment company, the full value of those shares is in your estate. BPR doesn't apply. The longer you leave it, the bigger the bill gets. But there are practical, legitimate ways to reduce it — if you start planning now.
Wondering what your IHT exposure actually looks like?
We work specifically with property company owners. A quick conversation is all it takes to understand where you stand — and what your options are.
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