zkSync Tax Software Compared

ZK Token Airdrop (June 2024)

The ZK airdrop distributed 3.675 billion tokens to eligible users. If you claimed, it's taxable as ordinary income at the fair market value on your claim date. The claim deadline was January 3, 2025 — unclaimed tokens were returned to the protocol. Check eligibility and claim status at ZK Nation.

Tax-loss harvesting angle: if you claimed ZK at 2024 prices and still hold it, your income-based cost basis is likely far above ZK's current price (down roughly 96% from peak). That gap may represent a real capital loss you can harvest by selling — consult a tax professional about whether this fits your situation.

zkSync Era vs zkSync Lite

zkSync Era (launched March 2023) is the main network with full smart contract support — this is where most DeFi activity happens. zkSync Lite is an older, simpler network for payments that stopped block production on May 4, 2026. This wasn't a total loss of access: per ZKsync's official sunset post, funds remain claimable after shutdown through dedicated claim tools, and a read-only API for historical Lite data is expected to stay available for at least a year. All three major tax tools (Koinly, CoinLedger, and Summ) support Lite for historical data import, so your past transactions should still be accessible for tax reporting.

Bridge Transactions

Moving ETH or tokens from Ethereum mainnet to zkSync Era is typically not a taxable event if you're transferring to yourself. However, tax software may incorrectly flag these as disposals. Use the "mark as transfer" feature to link the send and receive, avoiding phantom capital gains.

Security Incident (April 2025) — Resolved

In April 2025, a compromised admin account led to 111 million unclaimed ZK tokens being minted from the airdrop contract. The incident is now fully resolved — the hacker accepted a 10% bounty and returned approximately $5.7M to the ZKsync Security Council within a 72-hour safe harbor window. A post-mortem was published and the vulnerability has been patched. If you were affected, document everything carefully and consult a tax professional about any implications.

Etherscan Instance Shut Down (January 2026)

The dedicated zkSync Etherscan instance shut down on January 7, 2026. Transaction data is now available through the native ZKsync Explorer. We haven't independently confirmed which tax tools have fully migrated to the native explorer API — before relying on an import, check that your tool's transaction history for zkSync is current and complete.

Argent Wallet Tracking Gap (Report Possibly Dated)

A Koinly Discuss forum thread reported zkSync transactions in Argent wallets not tracking correctly as Argent assets. We haven't confirmed whether this is still an issue — if you use Argent on zkSync, double-check your imported balances against the wallet itself before filing.

Form 1099-DA and Per-Wallet Cost Basis (Rev. Proc. 2024-28)

Starting with the 2025 tax year, brokers report crypto proceeds on the new Form 1099-DA, and cost-basis reporting for transactions from 2026 onward follows IRS Rev. Proc. 2024-28's per-wallet (rather than universal/pooled) accounting method. If you hold zkSync assets in self-custody wallets, brokers generally won't report those — you're responsible for self-reporting cost basis per wallet. See Koinly's explainer on Rev. Proc. 2024-28 and consult a tax professional to confirm how this applies to your situation.