How to swap Ethereum in United Kingdom
Verified 2026-06-03 · 2 primary regulators · 4 venues compared
Short answer
Swapping ETH for another crypto in the UK in 2026 IS a Capital Gains Tax (CGT) disposal — UK CGT does NOT exempt crypto-to-crypto swaps regardless of destination asset (stablecoin destinations included). Gain = ETH swap-FMV in GBP minus Section 104 pool basis. Asset received establishes new Section 104 pool entry at swap-FMV. Same-day + 30-day matching rules apply. Primary venues: Coinbase Advanced Trade UK + Kraken Pro UK at 0.0-0.6% taker. DEX paths on Ethereum L1 + L2 (Uniswap, 1inch) work for UK self-custody users but multiply reporting events on multi-hop swaps. CRITICAL: swap of ETH → stETH (Lido liquid staking) is treated by HMRC as a CGT disposal of ETH + acquisition of stETH (separate basis).
Fee comparison
All-in cost per venue across the most-common payment + settlement paths. Verified 2026-06-03.
| Venue | Swap Fee | Min Swap | Supports Eth To Anything | Tax Event Clarity |
|---|---|---|---|---|
| Coinbase UK | Convert: 1.5-2.5% spread; Advanced Trade: maker 0.0% / taker 0.6% | £2 | Yes; ETH-BTC + ETH-USDC + ETH-USDT + ETH-GBP pairs on Advanced Trade | Each swap = CGT disposal of ETH + new Section 104 pool entry |
| Kraken UK | Pro: maker 0.16% / taker 0.26%; Instant Convert: ~1-1.5% spread | £10 | Yes; ETH-BTC + ETH-USDC + ETH-USDT + ETH-GBP pairs | Each swap = CGT disposal |
| Bitstamp | Tiered: 0.40% taker / 0.30% maker at < £20k | £10 | Yes; ETH-EUR + ETH-USD + ETH-USDT + ETH-BTC pairs | Each swap = CGT disposal |
| Uniswap v3 (Ethereum L1 + L2) | 0.05% / 0.30% / 1% pool fee + L1/L2 gas + slippage | Network gas dependent | Native ETH → any ERC-20 on L1 or L2; deepest DEX liquidity globally | Each swap = CGT disposal of ETH; multi-hop swaps multiply events |
Regulatory framing — United Kingdom
Crypto-to-crypto swaps are CGT disposals under HMRC interpretation — the Cryptoassets Manual is explicit that exchange-token-to-exchange-token swaps trigger disposal events. ETH → BTC = CGT disposal of ETH + acquisition of BTC at swap-FMV (new BTC Section 104 pool entry). ETH → USDC stablecoin swap = SAME CGT disposal treatment (UK does NOT exempt stable destinations). ETH → stETH (Lido liquid staking deposit) is also treated as a CGT disposal of ETH + acquisition of stETH — this is structurally interesting because stETH is functionally 'staked ETH' but HMRC treats it as a distinct exchange token. ETH ↔ ETH L1/L2 bridge (via official Ethereum bridge contracts) is probably NOT a disposal (same asset across chains) — HMRC unspecified but conservative reading favors same-asset treatment for officially-bridged variants. Wrapped variants (wETH on L1 vs ETH) are typically not separate disposals since wETH ↔ ETH is 1:1 + same Ethereum mainnet.
Primary regulators: FCA · HMRC
Common gotchas
- ETH → stETH / rETH / cbETH IS a CGT disposal. UK-specific gotcha: depositing ETH into Lido (receiving stETH) is treated by HMRC as a CGT disposal of ETH + acquisition of stETH. This is structurally different from US guidance which is less explicit. UK active LST users have substantial reporting overhead — every Lido deposit/withdrawal is a CGT event.
- Swap to stablecoin IS a CGT disposal. ETH → USDC at swap-FMV = CGT disposal of ETH at GBP FMV on swap date. The destination being a stablecoin doesn't change the calculation. Track every stable swap.
- Same-day + 30-day matching apply to ETH swaps too. Selling ETH (via swap to another crypto) + buying ETH back within 30 days triggers matching. Plan around this for rebalancing.
- Multi-hop swaps multiply reporting events. ETH → BTC → USDC = TWO CGT disposals (ETH + BTC). Direct ETH-USDC pair at CEX = ONE CGT disposal. Prefer direct pairs to minimize reporting overhead.
- L1 ETH ↔ L2 ETH bridge is probably non-taxable. The official Arbitrum/Optimism/Base bridges move ETH between chains as same-asset; HMRC has not formally ruled but conservative reading favors non-disposal treatment. Third-party bridges (Across, Hop) involve swap-like mechanics + may trigger disposal — verify mechanism.
Step-by-step
- Calculate the CGT impact BEFORE swapping. Pull ETH Section 104 pool basis. Estimate swap GBP FMV. Calculate: gain = swap-FMV - (pool basis × proportion sold). If significant + you're already near £3k allowance: consider deferring.
- Run same-day + 30-day matching analysis. If you've bought ETH (any venue) in last 30 days OR plan to buy: 30-day rule may match against sale. Same-day buys match same-day sales.
- Choose direct pair vs multi-hop. ETH → BTC direct on Coinbase Advanced Trade / Kraken Pro: ONE tax event. ETH → USDT → BTC: TWO tax events. Direct pairs minimize reporting overhead.
- Execute the swap on Pro/Advanced tier. Coinbase Advanced Trade or Kraken Pro: ETH-X pair, limit order. Avoid Convert + Instant Convert (1-2.5% spread).
- Record disposal + new pool entry. ETH disposal: date, ETH amount, swap-FMV-in-GBP, pool basis used, gain/loss. Received asset: new Section 104 pool entry. If ETH → stETH: stETH gets its own pool basis; future stETH disposals (e.g., stETH → ETH back) are SEPARATE CGT events.
- Manage annual CGT allowance across all disposals. £3,000 allowance applies across all crypto + non-crypto disposals in the tax year. Track running total to plan further swaps optimally. Spread large swaps across tax-year boundary to use two years' worth of allowance.
Tax summary
Swapping ETH for any other crypto in the UK IS a CGT disposal of ETH at GBP FMV. Gain = swap-FMV - Section 104 pool basis. Asset received establishes new pool entry at swap-FMV cost basis. ETH → stETH (Lido) is a CGT disposal of ETH + acquisition of stETH (separate pool). ETH ↔ L2 via official bridge probably NOT a disposal (HMRC unspecified). Stablecoin destinations NOT exempt. Same-day + 30-day matching apply. CGT rates 10% basic / 20% higher. Annual allowance £3,000. See HMRC Cryptoassets Manual.
Where to read further
- United Kingdom crypto tax primer
- Best crypto banks in United Kingdom
- Best crypto tax software for United Kingdom filers
- /how-to/buy-ethereum-uk/
- /how-to/sell-ethereum-uk/
- /how-to/send-ethereum-uk/
- /how-to/swap-bitcoin-uk/
- /how-to/swap-ethereum-us/
- /crypto-taxes-uk/
Methodology
Fee data verified directly against each venue's public fee schedule on 2026-06-03. Regulatory framing cross-referenced against the Stage 1d info-layer + primary government sources (fca-cryptoasset, hmrc-cryptoassets-manual). Gotchas reflect operating experience + community-reported failure modes during the verification window. This page is editorial reference content — not financial, tax, or legal advice. Always verify the current state of each venue and the current law in United Kingdom before transacting.
Disclaimer
This page is general information, not financial, tax, or legal advice. Cryptocurrency regulation in United Kingdom evolves; verify the current rules with a qualified professional in your jurisdiction before relying on any specific approach. See terms.