About this calculator
The Business Capital Gains Tax Calculator estimates tax on the disposal of qualifying business assets, including scenarios where Business Asset Disposal Relief may apply. It is useful for company owners, sole traders, partners, and shareholders planning a sale, closure, share disposal, or transfer. Business CGT depends heavily on asset type, ownership period, trading status, relief conditions, and the wider income tax position.
Business CGT methodology
The calculator estimates the gain, deducts allowable costs and reliefs, then applies the relevant CGT or Business Asset Disposal Relief rate where the conditions are met.
- Gain = disposal proceeds - acquisition cost - allowable costs
- Taxable gain = gain - losses - annual exempt amount - reliefs
- CGT due = taxable gain x applicable rate
How to use the Business Capital Gains Tax
- Enter the main value or details requested by the calculator.
- Check the unit, date, rate, or category selected before calculating.
- Review the result and any supporting breakdown shown on the page.
- Change one input at a time if you want to compare scenarios.
- Keep the result with the source record if you need to refer back to it later.
Worked example
Business asset disposal
Input: Asset sold for GBP 150,000, cost GBP 60,000, allowable costs GBP 5,000
Calculation: 150,000 - 60,000 - 5,000
Result: Estimated gain is GBP 85,000 before annual exemption, losses, and any relief.
Planning scenario
Input: A user enters the main details requested by the Business Capital Gains Tax.
Calculation: Gain = disposal proceeds - acquisition cost - allowable costs
Result: The result gives an estimate that can be checked against source documents, official guidance, or the relevant record.
Business Asset Disposal Relief
Business Asset Disposal Relief, formerly Entrepreneurs Relief, can reduce the CGT rate on qualifying disposals up to a lifetime limit. Relief is not automatic: the business, shares, role, ownership period, and trading status may all need to qualify.
| Question | Why it matters |
|---|---|
| Is the company trading? | Investment companies and non-trading activity can affect relief |
| How long were shares or assets owned? | Minimum holding periods can apply |
| Is the seller an officer or employee? | Some share disposals require role conditions |
| Has the lifetime limit been used? | Previous claims can reduce remaining relief |
Business CGT vs personal CGT
Business CGT focuses on business assets, shares in trading companies, partnership interests, and qualifying disposals. Personal CGT covers assets such as shares, crypto, second homes, and valuables. Some disposals overlap, so it is important to identify the asset and relief route before estimating tax.
Limitations
This calculator provides an estimate only and is not financial or tax advice.
- Relief eligibility can be complex and fact-specific.
- Company structure, connected-party transactions, and anti-avoidance rules are not fully assessed.
Frequently asked questions
Is Business Asset Disposal Relief automatic?
No. The disposal must meet the relevant conditions and the claim must be made correctly.
Can company shares qualify?
Some shares in trading companies can qualify if ownership, voting, role, and time conditions are met.
Does this replace an accountant?
No. Business disposals should be checked by a qualified tax adviser before filing.
What should I check before relying on the Business Capital Gains Tax?
Check the inputs against the source document or real-world record that controls the calculation. For rules-based topics, also check the latest official guidance because thresholds and definitions can change.
Can I use the result as a final decision?
Use the result as an educational estimate and planning aid. It should not replace professional advice, official decisions, lender quotes, medical guidance, legal advice, or tax advice where those apply.
Related calculators
- Capital Gains Tax Calculator
- Corporation Tax Calculator
- Dividend vs Salary Calculator
- SEIS / EIS Tax Relief Calculator