Liquidity providing (LPing) is the heartbeat of DeFi, but it is a nightmare for traditional accounting. When you deposit assets into a protocol like Uniswap or Curve, the tax treatment can be interpreted in two ways: Conservative and Aggressive.
The Conservative Approach (IRS Preference)
Most tax professionals recommend treating the deposit of assets into a pool as a taxable swap. When you deposit ETH and USDC into a pool, you are effectively "selling" those assets in exchange for a new asset: the LP Token.
The Entry: You realize a gain or loss on the ETH and USDC at the moment of deposit. Your "Cost Basis" for the LP token becomes the FMV of the assets you put in.
The Exit: When you "burn" or exchange your LP tokens to get your original assets back, you are swapping the LP token for the underlying assets. Any growth in the value of your position (from trading fees earned) is captured as a capital gain at this step.
The Aggressive Approach
Some filers argue that an LP deposit is more like a deposit or a loan, where you maintain "beneficial ownership" of the underlying assets. In this view, no tax is due until you finally exit the pool and recognize a gain or loss on the difference between your original investment and what you pulled out. However, in 2025 and 2026, with increased on-chain surveillance, this approach carries a higher audit risk unless applied with extreme consistency.