Capital Gains Tax (CGT) applies to the profit made when disposing of assets that have increased in value, such as shares, second homes, investment properties, cryptocurrency, or certain business interests. The tax is levied only on the gain, the difference between the disposal proceeds (sale price or market value) and allowable costs (original purchase price, improvement expenses, incidental costs like legal fees or stamp duty). Unlike income tax, CGT is not charged annually on unrealized growth; it arises only on realization through sale, gift, or other qualifying disposal.
The UK CGT regime has seen significant tightening in recent years. The annual exempt amount (AEA), which was £12,300 in 2022/23, was reduced to £6,000 in 2023/24, then to £3,000 for the 2024/25 and 2025/26 tax years. This £3,000 threshold remains unchanged for 2025/26 (covering disposals from 6 April 2025 to 5 April 2026) and appears set to continue into 2026/27 based on current announcements and no contrary indications in the 2025 Autumn Budget. For trusts, the AEA is £1,500 (or £3,000 in certain vulnerable beneficiary cases).
Rates were increased in the 2024 Autumn Budget: the main lower rate rose from 10% to 18%, and the higher rate from 20% to 24% for most assets (effective immediately for disposals after 30 October 2024). Residential property rates remain at 18% (basic) and 24% (higher/additional). These rates apply unchanged into 2026/27, with no further alterations announced for the main CGT framework. Business Asset Disposal Relief (BADR, formerly Entrepreneurs’ Relief) sees a phased rise: from 10% to 14% in April 2025, then to 18% from April 2026. Carried interest taxation shifted to a flat 32% from April 2025, moving away from previous CGT treatment.
Historical context illustrates the impact of these changes. When the AEA was higher (pre-2023 reductions), far fewer individuals paid CGT; receipts were lower relative to asset values. The successive cuts have brought more taxpayers into scope, with OBR estimates projecting CGT raising around £19–20 billion annually in recent forecasts. Rate increases in 2024 aimed to raise revenue without broad income tax hikes, though they have prompted earlier disposals or restructuring in some cases. Looking forward, if the AEA remains frozen at £3,000 amid inflation (forecast around 2–3% in 2026), the real value erodes further, potentially increasing liabilities for moderate gains.
Calculating CGT Liability Step by Step
To determine your CGT bill:
- Identify the gain: Subtract allowable costs from disposal proceeds. Allowable costs include original acquisition price, incidental costs (e.g., valuation fees, legal fees), and enhancement expenditure (e.g., improvements to property).
- Deduct losses: Offset current-year losses and any carried-forward losses from previous years. Losses must be reported even if no tax is due.
- Apply the annual exempt amount: Subtract the £3,000 AEA from remaining gains (after losses). Unused AEA cannot be carried forward.
- Determine taxable gain: Add the taxable gain to your taxable income (after personal allowance and other reliefs) to establish your tax band.
- Apply rates: Gains are taxed at 18% (lower rate) or 24% (higher/additional rate) depending on where the gain falls relative to income tax bands. Use the AEA against the highest-rate portion first for maximum benefit.
For example, if taxable income uses up the basic rate band (£12,571–£50,270), additional gains fall into the higher rate (24%). Residential property gains follow the same 18%/24% structure but are calculated separately in some reporting scenarios.
Key Changes and Considerations for 2026
No major structural overhaul is scheduled for Capital Gains Tax UK in 2026 beyond the BADR rate increase to 18% from April 2026. This affects qualifying business disposals (shares in trading companies, sole trader assets), making earlier sales (before April 2026) potentially advantageous if the 14% rate applies. Investor’s Relief lifetime limit remains £1 million, with similar rate implications.
Reporting rules require gains over four times the AEA (£12,000) to be reported even if below the threshold (via real-time CGT service for certain assets like shares, or Self Assessment). Property disposals trigger a 60-day reporting/payment obligation.
Planning Strategies to Minimize CGT
Effective planning can reduce or defer liability:
- Utilize the annual exempt amount: Time disposals to use the £3,000 fully each year. Bed-and-breakfasting (selling and repurchasing the same asset) is restricted by the 30-day rule, but bed-and-ISA transfers (selling and repurchasing inside an ISA) can crystallize gains within the allowance.
- Offset losses: Realize losses strategically to offset gains. Report current-year losses even if no tax due; carry forward indefinitely.
- Spousal transfers: Transfer assets to a spouse/civil partner at no gain/no loss. The recipient then uses their own AEA and potentially lower tax band.
- Use reliefs: Business Asset Disposal Relief (if qualifying) applies 18% from April 2026. Hold assets long-term for potential relief eligibility.
- Invest in tax wrappers: Place assets in ISAs or pensions to shelter future gains (ISA allowance £20,000; pension contributions attract relief).
- Timing: Defer disposals if expecting lower income (to use basic rate band) or accelerate if anticipating rate changes or allowance erosion.
- Gift to charity: Gifts to charity are exempt from CGT and may offer income tax relief.
HMRC provides official guidance on calculations and reliefs, while tools from providers like Hargreaves Lansdown or interactive investor offer calculators for estimates.
Smart Finance UK can help UK beginners in personal finance navigate capital gains tax changes 2026 UK and CGT allowance UK rules to optimize disposals and minimize liabilities.
Final Thoughts
CGT remains a targeted tax on realized wealth growth, with the £3,000 AEA and 18%/24% rates providing structure in 2026. Freezes in the allowance amid inflation gradually increase exposure, while BADR changes raise costs for business exits. Proactive planning, using losses, spousal transfers, timing, and wrappers, has historically saved significant sums for many. As digital reporting expands and rules stabilize, early preparation remains key to compliance and optimization.
Which assets are you considering disposing of in the coming months, and how might timing affect your position?
