VISION
What We Value
Guiding You to Accurate Filing with Confidence
When it comes to crypto tax filing in Japan, we place the highest priority on eliminating uncertainty and ensuring numerical accuracy. A qualified tax accountant works alongside you from start to finish.
Whether you need basic guidance or advanced gain/loss calculations, we explain everything in plain language. From collecting and organizing transaction records to computing gains and losses and final review, every step is designed to leave a clear audit trail.
We handle not only simple buy-and-sell trades but also DeFi, staking, and airdrops. Scope of work and pricing are clarified upfront. Whether this is your first filing or your portfolio is highly complex, we have you covered.
Common Challenges Our Clients Face
Pain Point
You're unsure how to handle the tax treatment of airdrops, staking, and various DeFi transactions, and you worry that doing it on your own could lead to problems in a future tax audit
Pain Point
You use multiple CEXs and DEXs, and consolidating data for gain/loss calculations feels overwhelming
Pain Point
You're considering setting up a domestic or overseas entity, or relocating abroad, but don't know where to start
Our professional services are here to solve these challenges
Why Choose ChainTAX
Reasons Clients Trust Us
A Highly Specialized Team
Our team pairs a tax accountant with Big 4 firm experience and corporate tax advisory background with an attorney who specializes in supporting crypto and blockchain projects
Personalized Solutions
Because there is often no single "right answer" in crypto taxation, we propose the best approach based on your individual circumstances
Efficient Data Processing
We streamline the aggregation and organization of complex crypto transaction data to support accurate gain/loss calculations
Peace of Mind for Tax Audits
We prepare filings designed to withstand tax authority scrutiny and provide support if an audit occurs
A Global Perspective
We offer comprehensive advice on international relocation, overseas entity formation, and other cross-border matters
Book a Free 30-Minute Consultation
Even in the initial consultation, we will do our best to answer your concerns within the allotted time.
During the free consultation, we provide the following:
- •Hearing about what types of transactions you have conducted
- •Overview of what data is needed for profit/loss calculation
- •Brief explanation of general tax treatment for airdrops, staking, novel DeFi transactions, etc. relevant to your situation
- •Introduction to our services
Crypto Tax Services
Leave the complexity of crypto tax filing to our specialists — we provide end-to-end support for your annual tax return in Japan
Basic Plan
Tax advisory and gain/loss calculation support for crypto assets, tailored to your annual tax filing in Japan
Individual Plan
Until one annual tax filing cycle is completed
Simple Plan: Clients with 200 or fewer transactions may be eligible for a discounted rate.
Corporate Plan
Customized to meet your organization's needs
Please reach out via the contact form for more details.
Additional Services
Customized to your needs
Tax Return Preparation & Filing
While you can prepare and file your own tax return, we offer optional preparation and submission by a licensed tax accountant if you prefer professional handling.
Individual Transaction Data Review & Correction
Our specialists review and correct transaction data one by one. Rather than reviewing every single transaction, we work with you to focus on DeFi trades, airdrops, entries that cannot be auto-classified, and high-value transactions — keeping review costs proportionate.
We also handle crypto-related tax matters for individuals and corporations beyond annual filing. Feel free to reach out through our contact form.
How It Works
Step-by-step support from initial consultation to completed filing
Initial Consultation
We discuss your transaction history during a free consultation and recommend the best plan for your situation.
Online available
Estimate & Agreement
We provide transparent pricing based on transaction volume and complexity. Digital contracts get you started quickly.
E-signature supported
Data Collection & Organization
We gather data from exchanges and wallets, then calculate gains and losses using specialized tools.
Progress updates provided
Filing Complete
Tax return prepared and filed.
Annual Support Schedule
Year-End Planning
- • Assess current gain/loss position
- • Evaluate tax-saving strategies
- • Propose year-end sales
- • Begin data organization
Filing Preparation
- • Finalize gain/loss calculations
- • Prepare tax return (optional)
- • Review and adjust
- • Ready for submission
Filing
- • Support for filing and Q&A
- • Tax return submission (optional)
- • Tax authority correspondence (additional option)
Why Early Consultation Matters
Year-end planning can make a significant difference
Consulting After the New Year
- • Limited tax-saving options
- • Insufficient time before the filing deadline
- • We may be unable to accept new clients due to capacity
Early Consultation
- • A wider range of tax-saving strategies
- • Ample time for thorough planning
- • Priority support
Supported Transaction Types
We handle all types of crypto transactions. Even the most complex trades are covered by our specialist knowledge
Basic Transactions
Buying & Selling Crypto
Purchase and sale of crypto assets on exchanges
Examples
Transfers & Receipts
Sending and receiving crypto between wallets
Examples
DeFi Transactions
Swaps
Token swaps on decentralized exchanges
Examples
Liquidity Provision (LP)
Providing funds to liquidity pools and receiving rewards
Examples
Lending
Lending and borrowing crypto assets along with associated interest
Examples
Staking
PoS Staking
Delegating to network validators to earn staking rewards
Examples
Liquid Staking
Staking while maintaining liquidity through derivative tokens
Examples
Airdrops
Tokens distributed by projects at no cost
Examples
Other
NFT Transactions
Buying, selling, and minting non-fungible tokens
Examples
Bridge Transactions
Transferring assets between different blockchains
Examples
Futures & Derivatives
Crypto futures and options trading
Examples
Important Notes
• For transaction types not listed above, please contact us for an individual consultation
• Additional fees may apply depending on transaction complexity and volume
• We also handle new protocols and transaction types based on the latest tax interpretations
• If you have any questions, please feel free to reach out through our free consultation
- Tax consulting at a Big 4 firm
- Corporate tax planning and audit response for listed companies
- Extensive cross-border transaction experience
- Crypto asset tax advisory
- ASG Audit Corporation (now Grant Thornton Taiyo LLC) — statutory audit
- PwC Tax Japan — domestic and international tax consulting
- Posted to Delhi NCR, India (2008–2011)
- Tax department lead at a major listed corporation
- Co-founded AsiaWise Tax & Accounting Office — Representative Tax Accountant
- LL.B., The University of Tokyo (2006)
- J.D., The University of Tokyo Law School (2008)
- Admitted to the Bar (2009)
- LL.M., The University of Sydney Law School (2019)
- Nishimura & Asahi: M&A, international contracts, IP, antitrust, IT sector advisory
- Corporate law firm: international transactions, IT industry M&A (2016–2018)
- AsiaWise Law Offices: blockchain and cross-border matters (2022–)
- Founded Pro-Innovation Law Office and Pro-Innovation Consulting (2023)
- Blockchain Lawyers GroupMember
- Superteam JapanMember
- Supporting blockchain project teams and founders
Customer Voice
The team understood the intricacies of various Solana-based transactions and provided well-considered tax treatment. They were also flexible in aggregating data from multiple sources.
They accurately calculated gains and losses after thoroughly understanding the mechanics of DEX trades, bridges, airdrops, and each protocol involved.
Customer Voice
They handled my annual tax filing covering on-chain transactions across Ethereum, Starknet, and other networks, demonstrating a solid understanding of each ecosystem. They were also very responsive and thorough in answering my questions.
I was impressed by their handling of L2 transactions and airdrop tax treatment on chains like Starknet, all based on the latest tax interpretations. They also accurately categorized tokens received through community activities after taking the time to understand the nature of each activity.
Customer Voice
If you've ever tried to reconcile thousands of crypto trades across centralized exchanges and self-custody on multiple chains, you know how messy it gets. The team handled 7,000+ transactions without issues and kept communication clear in English the whole way through.
What I appreciated most was that they didn't just run the numbers—they actually thought through the nuances with me.
Gain/Loss Calculation for Complex DeFi Transactions
Background
Over 1,000 DeFi transactions per year across Solana and Ethereum, involving a mix of yield farming, staking, and swaps
Challenge
Calculating gains and losses from complex on-chain transaction histories proved extremely difficult. Automated accounting software could not accurately value restaking tokens
Solution
Reviewed transactions above a certain profit threshold. Re-evaluated the treatment of deposit transactions and restaking tokens based on tax law, applying appropriate gain/loss recognition methods
Result
Accurate gain/loss calculations enabled a proper tax filing. Previously overstated profits were corrected to appropriate levels
Impact
Tax savings in the millions of yen and significant reduction in audit risk
Tracking Gains/Losses and Unrealized Gains by Asset
Background
Held multiple crypto assets and NFTs with no clear picture of the year-to-date gain/loss position heading into year-end
Challenge
Without understanding realized and unrealized gains before December 31, the client risked missing legitimate tax-saving opportunities — particularly failing to harvest unrealized losses on NFTs
Solution
Performed a detailed analysis of gains/losses and unrealized positions for all holdings before year-end, then proposed and supported strategic sales of loss-making crypto assets and NFTs before the tax year closed
Result
By selling loss-making assets in a profitable year, the client legally reduced taxable income
Impact
Tax savings of several million yen in combined income and resident taxes
Tax Treatment of Airdrops
Background
Received a large-scale airdrop from a blockchain protocol, with a total value in the tens of millions of yen
Challenge
The timing of receipt, valuation method, and point of gain recognition for the airdrop were unclear, making proper accounting impossible
Solution
Analyzed the underlying cause and conditions of the airdrop from a general tax law perspective, determining whether taxation should apply at the time of receipt and identifying the appropriate valuation method
Result
Correctly determined the timing of gain recognition; for a portion of the airdrop, taxation at receipt was avoided in favor of taxation at the point of sale
Impact
Deferred recognition of gains in the tens of millions of yen, improving cash flow
Data Organization for a New L2 Chain
Background
Early adopter of DeFi on an emerging Ethereum L2 chain
Challenge
Crypto accounting software did not yet support the new L2 chain, requiring manual data organization that was extremely time-consuming
Solution
Developed an efficient data extraction and organization workflow using blockchain explorer APIs and AI tools to systematically structure the transaction history
Result
Significantly automated portions that would have required manual entry, drastically reducing data organization time
Impact
Reduced processing time and achieved accurate gain/loss calculations
- Major cryptocurrencies such as Bitcoin and Ethereum
- Trades on overseas exchanges
- DeFi transactions, airdrops, staking, and NFT trading
- Transactions on various L2 chains
- We strongly recommend reaching out well before Japan's tax year ends on December 31
- Early consultation allows time to evaluate and implement tax-saving strategies before year-end
- Late consultations may not leave enough time for year-end data aggregation
- During peak filing season, we may be unable to accept new clients due to high demand
- Salaried employees: annual tax filing is required if crypto gains exceed ¥200,000
- Dependents: filing is required if total income exceeds ¥480,000
- Sole proprietors: filing is required regardless of the amount
- Filing is also required regardless of profit amount when claiming medical expense deductions or hometown tax (furusato nozei) credits
- We support data organization across multiple exchanges and DEXs
- We advise on efficient data aggregation methods
- Optional: we can review and correct transaction data on your behalf
- We use recommended crypto accounting SaaS platforms
- We review and adjust the output to ensure accurate gain/loss figures
- Subscription fees for external SaaS tools are borne by the client
- Current year: all transactions including date, quantity, unit price, and fees
- Opening balance: holdings, quantities, and acquisition costs as of January 1
- If opening-balance data is missing, full historical records may be required
- We also report year-end data for the following year's filing
- Airdrops, staking, and DeFi transactions often require manual review and adjustment
- A tax professional can identify tax-saving opportunities and prepare supporting documentation based on current tax law
- We are happy to explain specifics during a free consultation
- Exchange insolvency or closure may make direct data retrieval impossible
- Our experts can construct reasonable estimates from alternative records
- We recommend regularly downloading and backing up your exchange data as a precaution
- This refers to converting your crypto holdings to Japanese yen at year-end to crystallize gains and losses.
- Typically all holdings are converted, though selective exclusions can be discussed
- The downside is that all unrealized gains become realized taxable income
- Assets with large unrealized gains may be excluded on a case-by-case basis
- We build well-reasoned, defensible interpretations backed by supporting documentation
- We provide expert advice to help you stay compliant
- Optional: we can represent you in a tax audit if needed
- Advice on international relocation
- Assistance with overseas entity formation
- On-the-ground support coordinated with local partners
- Absolutely — we support clients who trade exclusively on domestic exchanges
- A professional review saves time and provides peace of mind
- We also assist with identifying deductible expenses
- Clients with a low number of transactions may qualify for pricing below the Basic Plan
- Contact us for a free consultation and personalized estimate
Book a Free 30-Minute Consultation
Most people find crypto taxation confusing — you don't need to have everything figured out before reaching out.
We'll recommend the best approach based on your trading activity and concerns.
We break down technical jargon, organize the process step by step, and guide you through data preparation, gain/loss calculation, and final review.
Share your current situation and we'll map out the most efficient path forward.
ChainTAX — Crypto Tax Support Service
Crypto Tax Advisory, Calculation & Filing Support for Japan
DeFi / Airdrops / Staking Supported
