When someone dies owning a business, working out what it’s worth is one of the trickiest jobs an executor faces. There’s no price tag to check, since private company shares don’t trade on any market.
This value decides how much Inheritance Tax the estate pays, and it matters more now than ever. From April 2026, the tax break that used to cover business assets in full got a cap. According to GOV.UK, full relief now only applies up to £2.5 million per person, with anything above taxed at 20%. So a business valuation that used to barely matter could now decide a huge chunk of the tax bill.
When someone dies and they own a business, someone has to find out what that business is worth. This is called a probate business valuation. It matters because it decides how much tax the estate has to pay.
A house has a market you can check. A business does not work that way, especially if it is a small private company. There is no price list. So the executor, the person in charge of the estate, has to figure out what a buyer would have paid for it on the day the person died.
This applies no matter what kind of business it is:
Once that value is set, it goes into the Inheritance Tax paperwork. If the estate is worth more than £325,000, this number can change how much tax is owed and when it needs to be paid. GOV.UK says valuing an estate can take months, and a business often takes the longest.
Getting help early makes this easier. Our private client tax team walks executors through it step by step, and if things get complicated, you can always get in touch to ask questions.
There is no single rulebook HMRC uses for every business. But the idea stays the same. The value should show what a real buyer would pay a real seller, using all the facts a buyer would want to see, like accounts and how the business has been doing.
Most valuers look at a business in three ways:
A good valuer often uses more than one of these to check the number makes sense.
How much of the company someone owned also matters. Owning enough shares to make decisions is worth more per share than owning a small slice. Some executors think using the face value printed on the shares is good enough. It usually is not, and it can cause trouble later if the shares end up selling for more.
If a business is being sold or passed on as part of the estate, our corporate and business tax team can help make sure the valuation holds up. For cases where a company sale is involved, our page on buying or selling a company explains more. HMRC’s own guidance on share valuations is also worth a read.
Once the Inheritance Tax return is sent in, HMRC does not just take the number and move on. They have a special team called Shares and Assets Valuation. Their job is to check share values for private companies, since there is no public price to compare against. You can read more about how this team works on GOV.UK.
If land or property is part of the business, a separate valuer called the district valuer may check that part too.
So what happens if HMRC thinks the number is wrong? A few things can follow:
Most disagreements get sorted out through simple back and forth, not a full tribunal hearing. But it helps to have someone in your corner who understands what HMRC is looking for.
This is exactly where our tax disputes and investigations team steps in. If HMRC has already raised questions about a valuation you submitted, do not wait, reach out to us and we can help sort it out before it turns into a bigger problem. A valuation set too low can lead to a penalty. One set too high means paying more tax than needed. Getting it right the first time saves stress later.
This is the biggest change, and it affects almost every estate with a business in it. Business Property Relief can lower or wipe out the Inheritance Tax owed on a business. Until recently, there was no limit on how much could be relieved.
That changed on 6 April 2026. Full relief now only covers the first £2.5 million per person. Anything above that only gets half relief, which works out to a 20 percent tax rate instead of the usual 40 percent. GOV.UK confirms this £2.5 million cap now covers both business and farmland assets added together, not separately.
There is some good news too. Married couples and civil partners can pass on unused allowance to each other, meaning together they could shield up to £5 million.
Here is why this matters for a probate business valuation. Before, a business could be worth any amount and still pay no tax, so the exact number was not always critical. Now it can decide a huge chunk of the tax bill. A £4 million business that once paid nothing could now leave £1.5 million exposed to tax, a bill of £300,000, all resting on how the shares were valued.
Our private client tax team can walk you through what this means for your estate, and our page on innovative tax reliefs covers other ways to reduce the tax owed.
Getting a probate business valuation right takes more than a guess. It needs paperwork, and gathering it early saves a lot of delay later.
Here is what is usually needed for a company:
If the person who died ran the business alone or with a partner, similar records are needed instead, covering income, what the business owns, and what it owes.
It also helps to check something important early on. Not everything inside a business counts toward relief. Extra cash sitting in the business, investments, or property not actually used for trading can all be left out of the relief, even though they sit on the same balance sheet as the parts that do qualify. GOV.UK has a helpful checklist on gathering the right information when valuing an estate.
Working out which parts of the business qualify is easier with the right advice. Our professionals page explains how we support solicitors and other advisers through this process, and if you are ready to get started, you can contact us directly to talk through what your estate needs.
Finding out what a business was worth after someone dies is not easy. And now that the tax relief on business assets has a limit, getting the number right matters more than ever. A good valuation keeps the estate safe from HMRC questions and stops the family from paying more tax than they should.
This is where ETC Tax comes in. We help executors and families work out what a business is worth, sort out the paperwork, and check if reliefs like Business Property Relief apply. If you are dealing with shares, a family business, or a partnership that needs valuing, our private client tax team can guide you through it. And if HMRC has already raised questions about a valuation, our tax disputes team can help sort it out.
Want to understand what goes into a business valuation? Read more about Business Valuation to learn how different methods are used, then browse our case studies to see how those principles apply in real client scenarios.
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