Quick answer
Bridging tokens from Ethereum to Solana may be a quick DeFi move — but it might also be a taxable disposal.
DeFi & Web3
Australia
Canada
Germany
United Kingdom
United States
Cross-Chain Bridge
Protocols enabling cryptocurrency transfer between different blockchains; bridging may constitute a taxable swap in most jurisdictions.
AustraliaCanadaGermanyUnited KingdomUnited StatesUnderstanding Cross-Chain Bridge on crypto
Cross-chain bridges are protocols that enable the movement of cryptocurrency assets between different blockchain networks — for example, moving ETH from Ethereum to Avalanche, or BTC from the Bitcoin network to Ethereum as WBTC. Bridges typically work by locking the original asset on one chain and minting a representative token on the destination chain. From a tax perspective, the key question is whether bridging constitutes a disposal of the original asset and acquisition of a new one. Most practitioners treat bridging as a taxable swap, particularly when the assets on the origin and destination chains are technically different tokens (even if economically equivalent).
Cross-chain bridges are protocols that enable the movement of cryptocurrency assets between different blockchain networks — for example, moving ETH from Ethereum to Avalanche, or BTC from the Bitcoin network to Ethereum as WBTC. Bridges typically work by locking the original asset on one chain and minting a representative token on the destination chain. From a tax perspective, the key question is whether bridging constitutes a disposal of the original asset and acquisition of a new one. Most practitioners treat bridging as a taxable swap, particularly when the assets on the origin and destination chains are technically different tokens (even if economically equivalent).
What this means for your crypto activity
Bridging may be disposal
Bridging ETH from Ethereum to Avalanche (receiving bridged ETH) may be a taxable disposal of the original ETH.
New cost basis on destination
The bridged token on the destination chain has a cost basis equal to the FMV at time of bridging.
Bridge fees taxable
Bridge fees (often paid in the origin chain's native token) are separate transactions that may also have tax consequences.
Bridging back is disposal
Bridging back (returning to the origin chain) is another potential disposal event.
Economic equivalence irrelevant
The economic equivalence of bridged tokens does not eliminate the legal argument for a disposal.
- Bridging ETH from Ethereum to Avalanche (receiving bridged ETH) may be a taxable disposal of the original ETH.
- The bridged token on the destination chain has a cost basis equal to the FMV at time of bridging.
- Bridge fees (often paid in the origin chain's native token) are separate transactions that may also have tax consequences.
- Bridging back (returning to the origin chain) is another potential disposal event.
- The economic equivalence of bridged tokens does not eliminate the legal argument for a disposal.
Seeing it in action
Example scenario
Anna bridges 5 ETH from Ethereum to Polygon to use in DeFi. Most tax advisors treat this as a disposal of 5 ETH at $2,500 each ($12,500 proceeds) and acquisition of 5 bridged ETH at $12,500 cost basis. If Anna's original ETH cost basis was $1,500 each ($7,500), she has a $5,000 capital gain — from a transaction she considered to be just moving assets.
How this works across jurisdictions
- Australia
ATO general CGT principles likely treat bridging as a CGT event where different tokens are involved.
- Canada
CRA general disposition rules apply; bridging likely a disposition at FMV.
- Germany
Cross-chain bridging likely a disposal; capital gains exempt if original asset held over 1 year.
- United Kingdom
HMRC disposal principles likely apply if the bridged token is a different asset from the original; guidance pending.
- United States
No specific IRS guidance on cross-chain bridges; most practitioners apply general disposal principles to token-for-token bridge transactions.
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