Top  5 Tax & Accounting Pitfalls Business Owners Make When Selling Their Business

Summary

• Sellers who fail to plan their exit early risk leaving significant value on the table through mispriced valuations, poor financial records, and avoidable tax exposure.
• Incomplete documentation and unresolved legal or structural issues commonly surface during due diligence, causing deal delays, price reductions, or failed transactions.
• Tax timing matters: the rate under Business Asset Disposal Relief rose to 14% in April 2025 and will increase again to 18% from 6 April 2026, narrowing the gap with standard Capital Gains Tax rates.
• This guide explains the key tax and accounting pitfalls UK business owners should address when selling a business, prepared by LegalVision, a commercial law firm.
• LegalVision specialises in advising clients on business sales, exit structuring, and commercial transactions.

Tips for Businesses

Start exit planning one to two years before going to market. Commission an evidence-based valuation, maintain up-to-date financial records, and resolve legal or structural issues early. Review your tax position before agreeing a deal, as timing can materially affect your net proceeds.

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On this page

• 1. Do Not Leave Money on the Table With a Mispriced Business Valuation
• 2. Get on Top of Your Accounting Records Early
• 3. Do Not Fall at the Last Hurdle – Due Diligence Makes or Breaks a Sale 
• 4. The Timing of a Sale Could Affect Your Tax Implications
• 5. Actively Plan in Advance to Maximise Your Exit Potential
• Frequently Asked Questions

Selling a business should allow shareholders to walk away with the maximum value for the time, effort and capital invested over the years. Yet according to a recent survey by Capital on Tap, 79% of business owners do not have an exit strategy in place and 36% have no plans to create one. 

Without proper planning, common legal pitfalls such as rushing the sale, misunderstanding your business structure or failing to release security interests can quickly complicate a transaction. 

While it is important to address legal considerations early, the accounting and tax implications of a sale can be just as consequential and are often overlooked until it is too late. 

In this guide, we break down the key tax and accounting pitfalls to watch out for and how to address them before going to market.   

When preparing for a sale, several recurring issues can undermine an otherwise strong business. Identifying these pitfalls early gives you time to address them or at the very least, explain them clearly to buyers.    

1. Do Not Leave Money on the Table With a Mispriced Business Valuation

An inaccurate valuation is one of the most common reasons sellers leave money on the table or see deals fall apart late in the process.  

Common mistakes include: 

• Relying on industry rules of thumb or subjective estimates rather than an evidence-based valuation. 
• Starting the valuation process too late, leaving little time to address weaknesses or defend assumptions during negotiations. 
• Failing to assess current market conditions, recent comparable sales and buyer appetite within the sector.  
• Overlooking intangible value drivers such as brand strength, proprietary technology, customer relationships or the depth of the management team. 
• Not fully identifying potential liabilities or risk exposures which can lead to price chips during due diligence. 
• Operating with an owner-dependent structure where key relationships, decision-making or operational knowledge sit heavily with the founder. This typically results in a lower valuation.   

To support a credible and defensible valuation: 

• Use an evidence-based valuation approach rather than relying on rules of thumb or informal estimates. 
• Start the valuation process early. This gives you time to identify value drivers, fix weaknesses and position the business before going to market.  
• Review recent sales of similar businesses in your sector. Industry specialists can provide access to market data and current valuation multiples. 
• Document and evidence intangible assets such as intellectual property, brand value, customer retention and management capability, quantifying their impact where possible. 
• Identify liabilities, legal exposures, and operational risks early. Address them where possible or be prepared to explain them clearly during negotiations. 
• Put Standard Operating Procedures (SOPs) in place using tools such as Scribe, Loom or Process Street. Adopt a dedicated CRM system like Monday.com to manage workflows and customer relationships.

2. Get on Top of Your Accounting Records Early

Buyers are quick to lose confidence when accounting records are inconsistent or when monthly management accounts are missing for recent years.  This can lead to deal renegotiations with buyers seeking additional warranties, indemnities or retention clauses to mitigate perceived financial risk. 

You should be ready to provide: 

• Three years of statutory accounts including the balance sheet, profit and loss statement and cash flow statement. These underpin the valuation and help buyers assess financial performance.
• Forward-looking cash flow forecasts that show how the business is expected to perform if it continues on its current trajectory. This helps buyers understand future returns under their ownership. 
• A clear schedule of business assets. This should cover both tangible assets and intangible assets such as intellectual property, investments and surplus cash held by the company. 

To support clear and reliable financial records: 

• Use a reliable accounting system such as Xero or QuickBooks to keep financial data consistent and up to date.   
• Maintain monthly management accounts with accurate figures. This signals strong financial control and a well-run business.

• Review working capital by assessing debtors and creditors. Buyers will typically agree on a target working capital figure based on the company’s historical averages over the previous 12 months, adjusted for seasonality, growth or one-off events. This figure becomes a benchmark at completion. 

If the working capital at closing is higher than the agreed target, the seller receives the difference as an increase in the purchase price. If it is lower than the target, the purchase price is reduced by the shortfall. This protects the buyer from having to inject additional cash into the business immediately after completion.

3. Do Not Fall at the Last Hurdle – Due Diligence Makes or Breaks a Sale 

Most issues linked to poor or incomplete documentation surface during the due diligence phase. At this stage, buyers will look closely at legal and operational documentation. 

Common gaps include:  

• Missing or incomplete employment contracts.
• Unclear ownership of intellectual property, particularly where work has been created by founders, directors, contractors or consultants. 
• Patents, trade names, licences or domain registrations that are not in place or not held by the company. 
• Failing to confirm whether ICO registration is required for the business.
• Ongoing or unresolved litigation. 

To reduce risk and avoid delays during the sale process: 

• Carry out a legal review well ahead of the sale. An early assessment by a specialist solicitor can help identify issues before buyers raise them and allow time to address any gaps. 
• Review customer, supplier and property agreements that are close to expiry or contain change-of-control provisions and update or renegotiate where possible. 
• Ensure intellectual property is clearly owned and documented. Trademarks, domain names, patents and core software should sit with the selling entity and be properly recorded. 
• Check that statutory records, Companies House filings, PSC Register (People with Significant Control) and corporate minutes are up to date and accurate. 
• Review employment arrangements carefully. In share sales, employment liabilities transfer with the business. Contracts, policies and benefits should be documented and compliant with Transfer of Undertakings (Protection of Employment) Regulations (TUPE) clearly understood. 

Having these legal and operational documents in order can speed up the sale process, support valuation discussions and strengthen buyer confidence by signalling operational maturity and transparency.  

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4. The Timing of a Sale Could Affect Your Tax Implications

Many owners focus on the sale price and only review tax exposure once a deal is agreed. By then, planning options are limited. 

Here are key points to keep in mind for a 2026/27 sale: 

• Business Asset Disposal Relief (BADR) was previously taxed at 10% before increasing to 14% in April 2025. From 6 April 2026, the rate will rise further to 18% while the £1 million lifetime limit remains unchanged.   
• The standard Capital Gains Tax (CGT) rate is 24% for higher-rate taxpayers and 18% for basic-rate taxpayers on gains from other chargeable assets. BADR still offers a reduced rate but the gap is narrowing. 
• Buyers will examine Earnings Before Interest, Taxes, Depreciation and Amortisation (EBITDA) closely during due diligence. If the accounts include personal expenses or one-off costs, reported profit may not reflect sustainable earnings. This can affect valuation.  
• Corporation Tax (CT) may apply where a limited company sells business assets such as property, shares, equipment or intangible assets. The tax treatment of intangible assets depends on when they were acquired. Assets purchased on or after 1 April 2002 usually fall under the Intangible Fixed Assets regime where profits are treated as trading income and taxed through CT. Older assets may be taxed under the chargeable gains rules.  

To manage tax exposure effectively:  

• Review and plan the timing of a sale to navigate the narrowing gap between BADR and standard CGT rates. 

A higher-rate taxpayer must account for CGT at 24% which would amount to around £240,000 on a £1 million gain while a basic-rate taxpayer paying 18% would face a £180,000 liability. It is likely rates will change again in future, so planning early helps ensure you are prepared for changing tax exposure.

• Normalise EBITDA by removing non-recurring or owner-related expenses. This presents a clearer picture of the true earnings of the business.

• Keep clear purchase records and obtain professional valuations to confirm which tax regime applies to asset disposals.

5. Actively Plan in Advance to Maximise Your Exit Potential

Leaving exit planning until a buyer approaches can reduce sale value and weaken your negotiating position. Without preparation, sellers often lose control of timing, structure and tax efficiency. 

Despite this, many business owners often delay putting an exit plan in place due to:

• Emotional attachment to the company 
• Difficulty finding a suitable buyer or successor 
• Legal and structural complexities 
• Uncertainty around valuation 
• Limited awareness of available exit options 

Early planning makes a measurable difference. Well-prepared businesses can achieve valuations 20–40 higher than those entering the market in a rushed position.

Common exit routes among UK businesses include: 

• Sale to a third party
• Family succession
• Management buyout (MBO)
• Employee ownership trust (EOT)
• Merger or acquisition 

Each approach has different tax, legal and structural implications. Understanding these early helps you structure the exit properly and navigate the due diligence with confidence.  

For a deeper discussion on structuring your exit, see the webinar “Planning your exit: Tax and legal essentials for startups” or speak with a business valuation expert who can advise on timing, tax implications and deal structures, ensuring your business is positioned attractively to the right buyers.

If you need tax legal advice, LegalVisions expert tax lawyers can assist through our membership. LegalVision provides ongoing legal support for businesses through our fixed-fee legal membership. Our experienced lawyers help businesses manage contracts, employment law, disputes, intellectual property, and more, with unlimited access to specialist lawyers for a fixed monthly fee. To learn more about LegalVision’s legal membership, call 0808 196 8584 or visit our membership page.

Frequently Asked Questions

What tax issues should I consider before selling my business?

Before selling your business, consider whether Capital Gains Tax, Business Asset Disposal Relief or Corporation Tax may apply. The tax position will depend on how the sale is structured, what assets are being sold and whether you qualify for available reliefs. Planning early can help you manage tax exposure and improve your net proceeds.

How can poor accounting records affect the sale of my business?

Poor accounting records can reduce buyer confidence, delay due diligence and lead to price reductions, warranties, indemnities or retention clauses. Buyers will usually expect to see clear statutory accounts, monthly management accounts, cash flow forecasts and a schedule of business assets before completing a transaction.

Why is business valuation important when selling a company?

A business valuation helps determine whether the sale price reflects the true value of the company. Relying on informal estimates or industry rules of thumb can lead to undervaluation or failed negotiations. A strong valuation should consider financial performance, market conditions, comparable sales, intangible assets, liabilities and the business’ reliance on the owner.

How far in advance should I start planning to sell my business?

You should ideally start planning one to two years before selling your business. This gives you time to improve financial reporting, reduce owner dependence, review tax structures, resolve legal or operational issues and prepare for buyer due diligence. Early planning can also help strengthen your negotiating position and support a higher valuation.