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Pre-Sale Tax Health Checks

September 16, 2026

Why Every Seller Needs One

For many business owners, selling a company is a once-in-a-lifetime event. Years of hard work have gone into building the business, and understandably, the focus is often on finding the right buyer and achieving the best possible price.

What is sometimes overlooked is that buyers are not simply purchasing a business based on its profits. They are also buying its history. That means they will want to understand whether the company has complied with its tax obligations and whether there are any hidden risks that could come back to haunt them after completion. This is where a pre-sale tax health check can make all the difference.

What is a pre-sale tax health check?

Think of it as carrying out your own due diligence before a buyer does.

Rather than waiting for a buyer’s advisers to scrutinise every aspect of your business, a tax health check allows you to review your tax affairs in advance, identify any potential issues and, where possible, resolve them before they become part of the sale process. It’s a proactive exercise rather than a reactive one.

Instead of answering difficult questions under the pressure of a live transaction, you have the time and space to deal with matters properly.

Why does it matter?

Every buyer wants certainty.

When a buyer carries out tax due diligence, they are looking for anything that could result in an unexpected tax liability after they acquire the business. If they identify concerns, there are several possible outcomes and none of them are usually good news for the seller.

They may seek a reduction in the purchase price, request additional warranties or indemnities, or simply delay the transaction while further investigations take place. In some cases, repeated issues can even cause a buyer to walk away altogether. Many of these situations could have been avoided had the issues been identified earlier.

What sort of issues are commonly found?

You might assume that a tax health check is only worthwhile if you know there are problems lurking in the background. In reality, many businesses discover issues they had no idea existed.

Some of the more common areas include:

  • PAYE or benefits provided to directors that have not been reported correctly.
  • VAT treatments that have evolved over time without being reviewed.
  • Historic Corporation Tax positions that may not be fully supported.
  • Loans to directors or shareholders that have unexpected tax consequences.
  • Share issues, option schemes or company reorganisations that were not documented as intended.
  • R&D claims or capital allowance claims that may require additional evidence.
  • General compliance matters such as late filings or incomplete records.

None of these automatically mean a sale cannot proceed. However, discovering them yourself is almost always preferable to having a buyer uncover them first.

It’s not just about fixing mistakes

One of the biggest misconceptions is that a tax health check is simply an exercise in finding problems. In reality, it is just as much about identifying opportunities. For example, it may highlight that certain tax reliefs are available, that your ownership structure could be improved before a sale, or that there are planning opportunities which are only available if action is taken well in advance of completion. These opportunities often disappear once contracts have been exchanged, so timing is critical.

When should you carry one out?

Ideally, the answer is sooner than you think. Many business owners only start thinking about tax once a buyer has been found. By then, there may be limited scope to resolve issues or undertake any meaningful planning.

Starting 12 to 24 months before an anticipated sale provides far greater flexibility. It gives time to investigate any historic matters, implement planning where appropriate and ensure records are in good order before due diligence begins.

Of course, not every sale comes with that luxury. Even if a transaction is already underway, carrying out a review can still help you understand where any questions are likely to arise and prepare robust responses.

 A smoother transaction for everyone

Selling a business is demanding enough without unexpected tax issues appearing halfway through the process. A pre-sale tax health check won’t guarantee that a buyer won’t ask questions; they almost certainly will, but it can make those conversations far easier.

It demonstrates that the business has been well managed, provides confidence in the information being presented and reduces the likelihood of unpleasant surprises affecting negotiations. Ultimately, buyers value certainty. The more confidence they have in what they are buying, the more straightforward the transaction is likely to be.

The bottom line

 A successful business sale is about much more than agreeing a headline price. Protecting that value throughout the transaction is just as important.

A pre-sale tax health check allows you to identify risks before they become someone else’s discovery, gives you time to put matters right where necessary and ensures you enter negotiations from the strongest possible position.

Next Steps

If selling your business is on the horizon, contact us. Even if it is still a year or two away, taking the time to review your tax affairs now could be one of the most valuable steps you take before putting the business on the market.

Ellie Winterbottom

Ellie Winterbottom

Ellie is an Assistant Tax Manager at ETC Tax, advising individuals, entrepreneurs and businesses on a wide range of UK tax matters. She holds a First-Class BSc (Hons) in Accounting and Finance, is ATT qualified and is currently studying towards the CTA qualification. Ellie enjoys helping clients navigate complex tax issues and is committed to delivering practical, commercially focused advice with a high standard of client service.

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