In Crypto Tax Calculator (CTC), "rollover" indicates that the cost basis of the asset is transferred from the previous Swap and non-taxable Trade transaction(s). This information is displayed when you hover over the two-way arrow icon on a transaction.
When hovering over the two-way arrows, a rollover card appears. It refers to how CTC tracks the cost basis when a swap or non-taxable trade transaction (e.g., exchanging ETH for WETH) occurs in the transaction history of the disposed asset. Instead of treating the original asset as a disposal that triggers a taxable gain or loss, the cost basis of the original asset, adjusted for fees, rolls over to the new swapped asset.
For example:
Action | Market Price | Cost Basis | Gains |
Buy 1 ETH | $1,000 | $1,000 | - |
Swap 1 ETH for 1 WETH | $2,000 | $1,000 (Rollover) | - |
Sell 1 WETH | $ 2,500 | $1,000 (Rollover) | $1,500 |
In the Sell transaction, since the two conditions are met:
Disposal of the new swapped asset (i.e., WETH).
A swap transaction exists in the transaction history of the disposed asset.
The rollover should appear for WETH.
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