Selling Your Business: Key Tax Points Before You Agree a Deal
Introduction
Selling your business is a major life event and financial transaction. The last thing you want is a surprise £200k+ tax bill that wasn't in your projections.
This guide covers the key tax considerations before you sign on the dotted line.
Share Sale Vs. Asset Sale: the Tax Difference
Buyers might offer to buy your company shares (share sale) or buy the company's assets (asset sale). The tax treatment differs dramatically.
Share Sale:
- You sell your shares to the buyer
- Company remains with same assets and liabilities
- You trigger capital gains tax on the growth of your shareholding
- May claim BADR if the statutory conditions are met, subject to the rate and lifetime limit in force at the disposal date
Asset Sale:
- Buyer buys the company's assets directly
- Company remains as an empty shell (you then wind it down)
- Company pays corporation tax on gains as assets sell
- You then pay personal tax when distributing remaining cash
Tax implications:
A share sale is often more efficient for the seller because the gain is made directly by the shareholder, but BADR is not automatic. An asset sale can create tax at company level and then further tax when proceeds are extracted. The preferred structure depends on commercial terms and the buyer's requirements.
Business Asset Disposal Relief (badr)
BADR can be valuable for business owners, but it must be tested carefully.
Conditions:
- You own at least 5% of the company
- You've owned it for at least 2 of the past 5 years
- The company is trading (not investment holding)
Benefit:
- Capital gains tax rate reduced from 20% to 10%
- On a £1M gain, that's £100k tax saving
The shareholder must normally satisfy the personal company, officer or employee and ownership conditions for the required period before disposal. The company must also be a trading company or the holding company of a trading group. The detailed conditions should be checked before negotiations are advanced.
Share Sale Vs. Asset Sale: the Real Numbers
Company: Consulting firm
Assets:
- Property valued at £1M (cost £500k)
- Equipment valued at £200k (cost £100k)
- Brand/goodwill valued at £800k (cost £0)
- Cash: £100k
- Total value: £2.1M
Share Sale (Buyer buys your shares):
- Sale price: £2.1M
- Your cost base (original investment): £50k
- Gain: £2.05M
- BADR relief (50%): £1.025M exempted
- Taxable gain: £1.025M
- Capital gains tax (10% with BADR): £102.5k
- Your net: £1.997.5k
Asset Sale (Buyer buys the company's assets):
*Company level:*
- Property sale: £1M gain on £500k cost = £500k gain
- Equipment sale: £200k gain on £100k cost = £100k gain
- Goodwill sale: £800k gain (all gain, no cost)
- Total gains: £1.4M
- Corporation tax (19%): £266k
- Cash remaining: £100k + (£2.1M - £266k) = £1.934M
*Your level (distributing remaining cash to yourself):*
- Dividend: £1.934M
- Dividend tax (higher rate, ~34%): £658k
- Your net: £1.276M
Difference: Share sale nets you £721k more than asset sale (huge difference)
This is why share sales are preferred by sellers.
The Earn-out Trap
Many sales include deferred consideration (earn-outs). The buyer pays upfront and then additional amounts based on future performance.
Tax issue: If not structured carefully, you might lose BADR on the deferred portion.
BADR only applies if shares are disposed of as a complete transaction. If the earn-out structure makes the sale conditional, BADR might not apply to the deferred amount.
Example:
- Upfront payment: £1.5M
- Earn-out (if targets met): £600k over 3 years
- Total value: £2.1M
If the earn-out is structured as part of the share sale, BADR applies to the full gain (both upfront and deferred). If it's separate, BADR might apply only to upfront.
Key point: Structure earn-outs carefully with a tax adviser to preserve BADR.
Goodwill Valuation
In a share sale, "goodwill" (the value of brand, customer relationships, etc.) is worth money.
When you sell, the buyer might purchase goodwill as a separate asset under a restrictive covenant clause (non-compete agreement).
Tax consequence:
Restrictive covenant payments are taxable income to you (not capital gains). They're taxed at income tax rates (up to 45% for top earners), not the relevant CGT or BADR rate.
Example:
- Share sale value: £1M
- Goodwill allocated under restrictive covenant: £200k
- Remaining gain on shares: £800k
- Tax on goodwill (45% top rate): £90k
- Tax on share gain: calculated at the relevant CGT or BADR rate for the disposal date
- Total tax: £170k
If structured differently (goodwill allocated as part of share sale gain):
- Total gain: £1M
- Tax: calculated at the relevant CGT or BADR rate for the disposal date
- Total tax: £100k
Difference: £70k just from how goodwill is allocated.
Multiple Completion Payments
Some buyers structure the sale as multiple transactions over time (instead of one upfront sale).
If you receive installments after the 2-year BADR ownership window closes, you might lose BADR on later payments.
Example:
- You've owned shares for 2 years
- Sale completed over 3 years (installments)
- First installment (Year 2): Qualifies for BADR
- Second installment (Year 3): Might not qualify for BADR
This significantly affects your tax bill.
Post-sale Employment
Many buyers keep the founder on as an employee or consultant. This is common.
Tax point: Post-sale salary is separate from the sale proceeds.
Sale proceeds = capital gains Post-sale salary = income/employment income
Keep these separate in your tax return. Post-sale salary might push you into higher tax brackets, but it's not part of the BADR relief calculation.
Due Diligence Tax Issues
Buyers conduct tax due diligence (reviewing tax returns, HMRC compliance, outstanding liabilities).
Common issues that impact valuation:
- Unpaid taxes or HMRC assessments
- Contingent tax liabilities (pending enquiries)
- Transfer pricing concerns (if multi-entity)
- Employee share scheme complications
Get ahead of these. If you know there are potential issues, disclose them early. This prevents the deal collapsing or valuation reduction at completion.
Timing Considerations
When you sell within the tax year affects your overall tax bill.
Example: Sell in April vs. March - different tax years, different rate bands.
If you're close to a higher rate band threshold, timing the sale strategically could keep you in basic rate (20% CGT vs. 40% income tax).
Also consider:
- Other income (employment, rentals): Pushing you into higher rate anyway?
- Spouse's income: Could spouse benefit from claiming some gain?
- Loss carry-forward: Do you have previous losses to offset this year's gain?
Case Study: Business Sale Tax Planning
Situation: Software company owner selling to larger firm.
Deal structure initially offered:
- Upfront: £2M
- Earn-out (3 years): £1M
- Goodwill restriction: £400k
- Post-acquisition role: £150k salary for 2 years
Tax analysis:
- Initial structure: £1M share gain (upfront), £600k goodwill (earned over time, income taxed), lose BADR on deferred earn-out
- Estimated tax: £250k
Tax-optimised structure:
- All £3M allocated as share sale (defer earn-out structure within share sale)
- Minimise restrictive covenant
- Post-employment separate
- Assess whether BADR applies and whether the conditions can be protected
Revised estimated tax: £180k
Tax savings through restructuring: £70k
Pre-sale Tax Cleanup
In the 6-12 months before sale, consider tax cleanup:
Claim losses: Any historic losses you can carry back to offset current profits before sale.
Pay down director loans: Clean balance sheet is attractive to buyers.
Accrue expenses: Any outstanding bills, accrued holidays - accrue them to reduce pre-sale profit.
Fix compliance issues: If HMRC enquiries are pending, try to close them before sale.
Key Takeaway
Before agreeing to a business sale:
- Ensure you qualify for BADR (5%+ ownership, 2+ years)
- Structure as share sale (not asset sale)
- Plan earn-out allocation carefully (preserve BADR)
- Minimise goodwill allocation under restrictive covenant
- Keep post-sale employment separate
- Consider timing within the tax year
- Clean up tax compliance issues
The difference between good and poor structure can be £50k-£100k+ on a typical business sale.
Ready to talk?
Planning to sell your business? Engage a tax adviser 6-12 months before. We'll model scenarios, identify BADR qualification, optimise structure, and ensure you understand and manage the tax position on your sale.