Does Fantom report to the IRS?

No. Fantom is a decentralized network and doesn't report user activity. However, exchanges you use do report, and the IRS can trace on-chain activity.

What's the best crypto tax tool for Fantom?

Both Koinly and CoinLedger support Fantom. Given the Sonic migration, ensure your tax tool handles the FTM to S transition correctly.

Independent resource — not affiliated with Fantom Foundation or Sonic Labs.

Important: Fantom (FTM) migrated to Sonic (S) in May 2025. Both Koinly and CoinLedger now support Sonic — ensure you import both chains.

Fantom Tax Software Compared

Q: Is the FTM to Sonic (S) migration taxable?

The FTM to S token migration is a 1:1 swap that likely is not taxable, similar to other token migrations. However, the IRS hasn't issued specific guidance. Consult a tax professional.

Q: How are rebase tokens taxed on Fantom?

Rebase tokens like OHM forks automatically increase your balance without on-chain transactions. These increases are taxable income but aren't automatically imported by tax software — you'll need to add them manually.

Based on Fantom/Sonic support and user feedback from forums.

Koinly

Best for Fantom

Fantom wallet import — connect via public address for DeFi transaction tracking
Sonic chain now supported — native integration via public address
Historical & Sonic DeFi support — SpookySwap V3, Shadow Exchange, SpiritSwap, SoulSwap tracked
Rebase token guidance — manual import instructions available
Rebase token rewards not auto-imported (must add manually)

Try Koinly →

Alternative: CoinLedger

Fantom network support via wallet import
Easy DeFi protocol tracking
Sonic chain now supported — native wallet syncing

Try CoinLedger — code: CRYPTOTAX10 →

No tool is perfect — manual review is essential for rebase tokens and the FTM to Sonic migration.

Fantom Tax Issues to Know

FTM to Sonic (S) Migration

The 1:1 migration from FTM to S was completed in May 2025. This token upgrade is likely not taxable — your cost basis and holding period should carry over. The Fantom blockchain remained operational during the transition. Verify your tax software correctly treats this as a non-taxable migration.

Rebase Tokens (OHM forks, etc.)

Fantom had many rebase tokens (Tomb, Wonderland forks, etc.). These tokens increase your balance automatically without blockchain transactions. Tax software won't auto-import these rewards — you must manually add them as income deposits.

SpookySwap & Historical DeFi

SpookySwap migrated to Sonic as SpookySwap V3 with concentrated liquidity — it is not offline. Historical Fantom Opera data remains accessible via FTMScan. LP token merging can be tricky — some users report issues with the GUI. Ensure your tax software imports both legacy Fantom and Sonic wallet data to capture the full history.

Shadow Exchange

Shadow Exchange is the dominant Sonic DEX with roughly 65% market share and approximately $1B in monthly volume. It uses an x(3,3) incentive model. All swaps and LP rewards on Shadow are taxable events — ensure your tax software imports your Sonic wallet to capture this activity.

Staking Rewards

FTM staking rewards were taxable as ordinary income when received. If you staked via the fWallet, ensure these transactions are imported. For Sonic (S) staking on the new network, the same tax rules apply.

FAQ

Does the Fantom network report to the IRS?

No. Fantom is a decentralized network and doesn't report user activity. However, centralized exchanges do report, and starting 2025, the IRS requires per-wallet cost basis tracking.

Is the FTM to Sonic (S) migration taxable?

The 1:1 FTM to S token migration (completed May 2025) is likely not taxable, similar to other token upgrades. Your cost basis and holding period should carry over. However, consult a tax professional as the IRS hasn't issued specific guidance.

How are rebase tokens taxed?

Rebase tokens (like OHM forks on Fantom) automatically increase your balance through smart contract state changes, not transactions. These increases are taxable income when received but must be added manually to tax software.

Is SpookySwap still supported?

SpookySwap migrated to Sonic as SpookySwap V3 with concentrated liquidity. Historical Fantom Opera transactions remain accessible via FTMScan. Ensure your tax software imports both your legacy Fantom and Sonic wallet data.

Sources

Last updated: March 2026