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Domestic crypto-asset tax-software vendor layer (Cryptact / Gtax / CryptoLinc / Coinly, etc.)

Confidence: Likely Updated 2026-05-24 Review by 2026-11-20 Sources 5 Machine-translated Original (JA)
#exchanges#tax#software#saas#retail#institutional
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This entry sits under exchanges index. Read it against Domestic crypto-asset taxation detail — miscellaneous income vs separate self-assessment + individual vs corporate for peer / contrast context and FSA crypto-asset exchange registration system — number system / Local Finance Bureau jurisdiction / registration requirements for the broader system / regulatory boundary.

Overview

Domestic retail investors’ crypto-asset gains and losses must be filed as miscellaneous income (aggregate taxation, top tax rate 55%), and in cases mixing multiple VASP accounts + overseas exchanges + DeFi + NFT usage, manual calculation is practically impossible. The crypto-asset tax SaaS market that solves this has grown rapidly since 2018 . The National Tax Agency (NTA) has also strengthened, from 2023 onward, the requirement for VASPs to submit payment records of customer transaction information, and the need for tax-processing automation keeps growing. Cryptact / Gtax (formerly Aerial Partners family) / CryptoLinc (formerly GxC) / Koinly (a major overseas player’s Japan support) form the domestic 4 leaders.

Major domestic vendors

Cryptact (Cryptact, Inc.)

  • Founded: 2018 年
  • Headquarters: Tokyo
  • Main products: “Cryptact” (tax calculation + portfolio management for individuals), “Cryptact for Business” for institutional investors
  • Strengths: support for 80+ exchanges; transaction parsing for DeFi (Uniswap / Aave, etc.) + NFT + L2 (Arbitrum / Optimism / Base / Polygon); support for domestic alts such as NEM/Symbol
  • Accounting-firm tie-up: a B2B plan for accountants and tax accountants
  • Official: https://www.cryptact.com/

Gtax (provided by Aerial Partners, Inc.)

  • Founded: 2017 年 (Aerial Partners founding)
  • Headquarters: Tokyo
  • Main products: “Gtax” (tax calculation for individuals), “Guardian” (crypto-asset accounting for corporations)
  • Strengths: operated by the accounting firm Aerial Partners, supervised by tax accountants. Strong in corporate-oriented accounting integration (freee / Money Forward, etc.)
  • Features: supports a choice of moving-average method / total-average method, switching between calendar-year and corporate-fiscal-year-based calculation

CryptoLinc (formerly GxC / GxC, Inc.)

Koinly (a major overseas player’s Japan support)

  • Base: United Kingdom
  • Features: JPY support + domestic-exchange integration + broad DeFi support. Usage is expanding in the individual tier as a leading domestic 4 -class competitor
  • Strengths: comprehensiveness of DeFi / NFT transaction parsing thanks to global expansion (a major player in the US / UK / Australia / Canada, etc.)

Others

  • CRYPTO ZAIMU (Coin Tax, Inc.) — mid-scale share
  • TaxBit (US) / CoinTracker (US) / TokenTax (US) — major US players; support for Japanese users is limited

Main features (common across vendors)

  1. Exchange API / CSV integration: automatic import from major VASPs such as bitFlyer / GMO Coin / SBI VC Trade / Coincheck / bitbank / BitTrade
  2. DeFi transaction parsing: enter a wallet address such as MetaMask / OKX Wallet → automatic classification of on-chain transactions
  3. NFT trade parsing: trade parsing for OpenSea / Magic Eden / Blur, etc.
  4. Moving-average / total-average method switching: acquisition-cost calculation based on NTA directives
  5. P&L calculation + filing-document output: PDF for attachment to the final tax return / e-Tax integration
  6. Multi-year comparison: loss carryforward (corporations) / determination of whether P&L aggregation is allowed
  7. Payment-record reconciliation: a function to reconcile against payment records issued by VASPs (2023 strengthening)
  8. Corporate year-end fair-value measurement: support for Corporate Tax Act Article 61 (reflecting the 2024 amendment excluding self-issued / third-party-held tokens)

Linkage with tax-system reform

The domestic crypto-asset tax system has changed greatly in recent years → Domestic crypto-asset taxation detail — miscellaneous income vs separate self-assessment + individual vs corporate:

  • FY2024 年 — exclusion of year-end fair-value measurement for corporate-held crypto assets (self-issued + third-party-issued) (the joint JCBA + JVCEA request bore fruit)
  • Separate taxation for individuals — a long-standing industry request, not yet realized (miscellaneous income, top 55%, no P&L aggregation, no 3 -year loss carryforward)
  • NFT taxation — treatment of secondary circulation; the classification between inventory assets / miscellaneous income is a point of debate

Each vendor updates its logic with every amendment and publishes explanatory articles for users.

Practical work for institutional investors / corporations

For corporations, CryptoLinc + Guardian (the corporate version of Gtax) are the twin pillars. Audit-response data is automatically generated through integration with Japan crypto audit-firm landscape — Big4 + Grant Thornton Taiyo + BDO Sanyu crypto-practice comparison. A 3 -stage scheme has taken hold: tax advice from Domestic crypto law-firm landscape — Anderson Mori / Nishimura & Asahi / Mori Hamada / TMI / BCLP comparison + the vendor’s aggregated data + assurance from the audit firm.

Issues specific to DeFi / Web3 users

Each vendor continuously updates these automatic-classification logics.

Sources