Capital Gains Tax Calculator — Shares & Investments 2024/25
Calculate your CGT liability on shares, ETFs, cryptocurrency and business assets for the 2024/25 tax year. Includes the £3,000 annual exempt amount, Business Asset Disposal Relief (BADR), and Bed & ISA planning.
Capital Gains Tax — Shares & Investments
2024/25 rates: Basic 18%, Higher 24%, BADR 10% — Annual exempt amount £3,000
BADR applies to qualifying business assets only
Original cost including any allowable costs (brokers' fees, stamp duty)
Total proceeds received, less allowable costs of disposal
Used to show approximate holding period
Your income tax band determines CGT rate — based on remaining basic rate band
If you have already made other gains this year, enter the allowance already used
For partial share disposals from a pooled holding — average cost basis applies
5 CGT Planning Tips for Investors
- Use your ISA allowance (£20k/year):Gains inside a Stocks & Shares ISA are completely CGT-free. Build new investments inside an ISA to shelter future growth permanently.
- Bed & ISA: Sell holdings outside your ISA and rebuy inside — you pay CGT on the gain at the point of sale, but all future gains on that investment are sheltered. Most effective when you have unused CGT allowance or losses to offset.
- Transfer assets to your spouse before sale: Transfers between spouses are CGT-free. If your spouse has unused allowance or is a basic rate taxpayer, a disposal in their name can halve the tax bill.
- Capital losses can be carried forward indefinitely:If you have losses, report them to HMRC even if you don't owe tax — they can be carried forward to offset future gains. You must claim within 4 years.
- Crypto record-keeping: Keep a full record of every crypto transaction — date, sterling value at acquisition and disposal, transaction fees. Without this, HMRC can assess you on gross proceeds with zero cost basis.
CGT on Shares & Investments 2024/25
Capital Gains Tax applies when you sell or dispose of shares, funds, ETFs, cryptocurrency, or business assets at a profit. The 2024/25 rates were significantly changed from April 2024.
New Rates from April 2024
- Basic rate taxpayers: 18% on shares (up from 10%)
- Higher/additional rate taxpayers: 24% on shares (up from 20%)
- BADR rate: 10% (unchanged, lifetime limit £1M)
- Annual allowance: £3,000 (down from £6,000 in 2023/24)
Section 104 Pool
For shares in the same company, HMRC requires you to pool all acquisitions (average cost basis). When you sell a portion, you calculate the gain using the average cost of the pool. Same-day and 30-day anti-avoidance rules apply to prevent bed & breakfasting.
Crypto CGT
Every swap, sale, or gift of cryptocurrency is a disposal for CGT purposes. HMRC uses the Section 104 pooling rules for crypto too — keep detailed records of every transaction, including the sterling value at the date of acquisition and disposal.