A lower Corporation Tax rate can look appealing beside Capital Gains Tax. But the initial rate rarely gives the whole answer.
The result depends on who owns the Bitcoin. It also depends on whether proceeds stay invested and how you later take money from a company.
The tax layers that decide your BTC sale
The key comparison is total lifetime tax. Personal investors usually pay CGT once.
A company pays Corporation Tax first. Further Dividend Tax, Income Tax, or other charges may arise when money reaches you.
Corporation tax is not your final rate
A 19% Corporation Tax rate does not mean you keep 81p from every pound. Dividends come from profits after Corporation Tax.
After the £500 dividend allowance for 2025/26, dividends face tax at 8.75%, 33.75%, or 39.35%. Salary and director's loans can also trigger PAYE, National Insurance, or extra tax.
The company rate is only the first gate.
Losses stay with their own taxpayer
Personal BTC capital losses can usually reduce your own gains when correctly claimed. Company capital losses belong to the company.
Company losses usually reduce its chargeable gains. They do not reduce your personal CGT bill.
For Bitcoin Capital Gains Tax, you cannot normally choose the BTC units you sold. UK pooling rules group identical tokens into a section 104 pool.
The pool uses an average allowable cost. Think of it like mixing identical coins in one jar.
There are key exceptions. BTC bought on the sale date is matched first.
BTC bought within the next 30 days is matched next. Only then does the section 104 pool apply.
Repurchasing BTC soon after selling can change the gain. This can happen even if your overall holding barely changes.
Keep sterling values, purchase dates, and exchange fees for every transaction. Include swaps and BTC spending.
The timing and ownership of a loss matter as much as the gain. Personal crypto capital losses can usually offset your gains in the same tax year.
You can also carry them forward to later years. You must claim them within the HMRC time limit.
They cannot reduce a spouse's gains or a company's Corporation Tax bill. A company Bitcoin sale loss usually offsets only its chargeable gains.
It may apply in the same period or later periods. It cannot normally offset trading profits or a director's personal CGT on BTC gains.
A loss does not automatically make the company route more flexible.
Personal BTC sale when you need the proceeds
Personal ownership is usually clearer when you need sale proceeds soon. Calculate CGT on the sterling gain.
Then deduct allowable losses and the £3,000 annual exempt amount. You usually pay one main tax layer.
| £50,000 BTC gain, 2025/26 assumptions | Tax before personal use | Cash personally available | Best fit |
|---|
| Personal, full basic-rate band available | £8,460 CGT: 18% of £47,000 | £41,540 | One-off personal spending |
| Personal, higher-rate taxpayer | £11,280 CGT: 24% of £47,000 | £38,720 | Simple ownership and cash need |
| Company retains profit, 19% rate assumed | £9,500 Corporation Tax | £40,500 in company, not personal cash | Genuine business reinvestment |
| Company then dividend to basic-rate shareholder | £9,500 CT plus about £3,500 dividend tax | About £37,000 | Usually weaker for immediate cash |
Allowable costs reduce the taxable gain
Your gain is broadly sale value less purchase cost and allowable costs. These can include exchange fees and disposal-related blockchain fees.
Relevant professional fees may also count. Keep exchange CSVs, wallet addresses, and transaction IDs.
Keep timestamps, sterling values, and fee records too.
Personal sales are not usually subject to Income Tax
A personal BTC sale does not normally create Income Tax simply because it is large. Different treatment may apply where the facts point to trading.
Employment income, mining, lending, staking, or business activity can also change the treatment.
Personal ownership suits cash you plan to spend soon.
Company BTC works best for retained investment
A limited company can work if it already owns the BTC. It should retain sale proceeds for real business investment.
Its main benefit is cash deferral. It does not guarantee permanent tax savings.
Retained cash is not private money
Company proceeds can fund real business activity. Personal spending needs a clear record.
Any personal use must be a dividend, salary, reimbursed expense, loan repayment, or director's loan. A director's loan is company money that you owe back.
It is not tax-free pay.
Where the same £50,000 gain ends up
Personal sale
CGT paid once
Cash can be spent
Company sale
Corporation Tax paid
Cash belongs to company
Extraction
Dividend, salary or loan rules
Further tax may apply
Dividends may erase the saving
Retaining £40,500 in a company may look appealing. But it is not personal cash.
A dividend can reduce available cash to roughly £37,000 under the table assumptions. This is before accounts, bookkeeping, and other company costs.
The common mistake is to compare CGT only with Corporation Tax. You must also price the route from company cash to your pocket.
The transfer can trigger CGT today
Moving personally owned BTC to your company is usually a market-value disposal. You and your company are connected parties.
You may owe CGT on growth up to that value. This can apply even when no cash changes hands.
Record the valuation, date, wallet transaction ID, and terms. Choose this route only for funds that will stay in the business.
Avoid hidden compliance costs and HMRC risks
A company adds duties such as annual accounts and a Company Tax Return. It also needs a clear split between personal and company wallets.
Corporation Tax is usually due nine months and one day after the accounting period ends. Use separate exchange accounts and wallets from the first transaction.
Add written ownership labels to each account and wallet. This makes later records far easier to defend.
Record company payment of any personal bill straight away. Do not try to repair poor records at year end.
Mining, employee rewards, trading, trusts, spouses, and non-domicile issues can change the tax result. Large director's loans can also create Income Tax, National Insurance, residency, or valuation issues.
This comparison is less relevant if a company clearly owns the BTC. It is also less relevant if you are not UK tax resident. Seek tailored professional advice before selling or transferring if trading, trusts, spouses, non-domicile issues, employee rewards, mining, or large director's loans apply.
Keep a calendar as well as transaction records. For individuals, Self Assessment returns and balancing tax are usually due by 31 January.
This applies after a tax year ending on 5 April. The 2025/26 return and payment date is 31 January 2027.
A Bitcoin investment company usually files annual accounts at Companies House. It submits its Company Tax Return within 12 months of the accounting-period end.
It pays Corporation Tax on crypto gains nine months and one day after that end. Clear records show how retained profits later reached you.
They can show a dividend, which may face Dividend Tax. They can also show director's loan tax treatment.
Good records protect both tax positions.
What people ask
Should I sell BTC personally or through a company?
Sell personally if you need proceeds soon and already own the BTC. A company mainly suits long-term retained business funds.
How much is capital gains tax on crypto in the UK?
For 2025/26, most crypto gains face 18% within your unused basic-rate band. Gains above that band face 24%, after the £3,000 annual exempt amount.
Does a company pay less tax than CGT on bitcoin?
A company may first pay 19% or 25% Corporation Tax. Extraction taxes can leave less personal cash than a direct CGT sale.
Can I transfer my bitcoin to my limited company?
Usually not without a tax cost. A connected-party transfer is generally a market-value disposal and can trigger CGT.
Can I claim bitcoin losses on my tax return?
Yes, personal capital losses can usually offset your own gains. Company losses stay with the company.
When do I pay tax on a crypto sale in the UK?
For the tax year ending 5 April 2026, payment is usually due by 31 January 2027. This is the normal Self Assessment deadline.
Can HMRC see my bitcoin transactions?
HMRC can obtain exchange data and ask for records. CARF expands cross-border cryptoasset reporting.
Is using company sale proceeds personally a problem?
It can be if no dividend, salary, expense, or repayment basis applies. Formal records and extra tax may then follow.
Choose personal ownership for near-term cash
For an existing personal Bitcoin holding, personal sale is usually the stronger default when you need cash. It gives you one main tax layer.
Use a company only when retained corporate funds have a real long-term business use. The extra compliance work must also be worth it.
For near-term personal spending, choose personal ownership. A company can defer tax, but it rarely makes private cash simpler.
