Are there methods to minimize tax liability by offsetting gains and losses from crypto assets (virtual currencies)?

What Is Offsetting Gains and Losses in Crypto Asset Trading?

Profits from crypto asset (virtual currency) trading are generally taxable. However, when you incur losses, whether you can offset them against other income—known as offsetting gains and losses—is a crucial consideration. Many investors misunderstand this system, so gaining a precise understanding is the first step toward effective tax planning.

What Is Offsetting Gains and Losses?

Offsetting gains and losses in crypto asset trading refers to the process of netting profits and losses within a specified period to adjust your taxable income. For instance, if you realize gains from one crypto trade but incur losses in another, you can subtract those losses from your gains to lower your taxable amount. This means you only pay taxes on any net positive income, allowing you to reduce your taxable income even in profitable years if you have losses to offset.

However, losses from crypto assets cannot be offset against other income categories, so you need to be careful. Failing to understand this rule can result in unexpected tax liabilities.

Income Categories for Crypto Assets

Tax law treats income from crypto asset trades differently based on its income category. The following table summarizes the main income types and their features.

Profits from crypto asset trading are classified as miscellaneous income, which means you cannot offset them against employment or business income. While spot crypto assets are taxed as miscellaneous income at rates up to 55%, if a spot ETF is listed, they become subject to separate self-assessment taxation, reducing the rate to 20.315%. If classified as capital gains, you can carry losses forward for up to three years and offset gains and losses. Using a special account (with withholding tax) also eliminates the need to file a tax return.

Rules and Scope of Offsetting Gains and Losses

The main types of income from crypto asset trading include:

• Trading Gains or Losses: Profit or loss from selling held crypto assets or exchanging them for other currencies
• Profit from Use as Payment: Gains realized when using crypto assets for purchases or payments and their value has increased since acquisition
• Mining and Staking Rewards: Rewards earned from mining or staking crypto assets (generally classified as miscellaneous income, but may be business income if conducted at business scale)

All these types of income are generally classified as miscellaneous income (subject to comprehensive taxation). This means that you aggregate all crypto asset-related gains and losses within the same year for calculation, allowing offsetting among different crypto assets.

For example, consider the following scenario:

• Bitcoin: ¥1,000,000 gain
• Ethereum: ¥2,000,000 loss
• Ripple: ¥500,000 gain

In this case, the total is a ¥500,000 loss, so for that year, your crypto asset income is zero (as losses exceed gains). Thus, you can offset profits and losses from multiple crypto asset trades within miscellaneous income.

If you also have other miscellaneous income—such as side-business affiliate revenue—in the same year, you can aggregate those as well. For example,

• Side-business affiliate income (miscellaneous income): ¥500,000
• Crypto asset loss: ¥500,000

In this case, the two offset each other, resulting in miscellaneous income of zero.

When Offsetting Gains and Losses Is Not Allowed

There are clear rules on when you cannot offset gains and losses for crypto assets. As noted, crypto asset income cannot be offset against other income categories such as employment, business, or real estate income. The National Tax Agency officially states:

Losses arising from the calculation of miscellaneous income cannot be deducted from (offset against) other income such as employment income.

This means that no matter how much you lose from crypto asset trading, you cannot reduce your taxes by offsetting those losses against employment or business income. You also cannot offset losses against profits from financial income such as stocks or FX, as they are separate categories.

Summary Table: Offsetting Possibilities

The table below summarizes the specific cases where offsetting gains and losses is permitted or not.

As shown, crypto asset losses can only be applied within the same year and within miscellaneous income. For example, if you only trade crypto assets and end the year with a net loss, your miscellaneous income for tax purposes is simply “zero.” You cannot carry those losses forward or offset them with other income types.

In some cases, you may not need to file a tax return if your miscellaneous income is small (¥200,000 or less) or if side-business income for salaried employees is below a certain threshold. However, you must accurately report all profits from crypto assets. To avoid gray treatment for tax purposes, it is crucial to fully understand the rules for offsetting crypto asset gains and losses.

Common Misunderstandings about Offsetting Gains and Losses

Lack of understanding about offsetting crypto asset gains and losses can lead to problems like the following:

Consider the case of Employee A, who earns ¥8,000,000 in annual salary and trades crypto assets as a side business. In one year, A realizes a ¥1,000,000 profit and pays tax on it, but the following year, the market declines and A incurs a ¥1,000,000 loss.

A assumes the tax paid on the previous year’s gain can be offset by this year’s loss. However, crypto asset losses cannot be carried forward, nor can they be offset against employment income. As a result, the tax on the prior year’s gain must be paid as is, and the current year’s loss simply disappears.

If A then earns ¥200,000 from a side business the next year, that gain can be offset by the crypto asset loss to bring miscellaneous income to zero—but the remaining ¥800,000 loss cannot be used and is lost. Because crypto asset losses can only be used within miscellaneous income for the same year, it is important to check for other miscellaneous income and offset as much as possible.

Crypto asset transaction records are stored on the blockchain, and domestic exchanges are said to report information to tax authorities. In recent years, the National Tax Agency has strengthened audits for unreported crypto asset profits, so non-reporting or underreporting is highly likely to be discovered.

Income Categories and Taxation for Crypto Assets

Profits from crypto assets are classified as “miscellaneous income” and subject to comprehensive taxation, meaning they are combined with other income (such as salary) to calculate total tax due. Unlike salary income, miscellaneous income is not subject to withholding—you must file your own tax return and pay taxes directly.

Crypto asset profit is the amount remaining after deducting allowable expenses from income, and the entire amount is taxable. There is no special deduction like the one for capital gains on stocks; the full amount after expense deductions is taxed.

How Crypto Assets Differ from Other Major Income Categories

The table below compares the tax treatment of crypto assets with other major financial instruments.

Tax Differences and Key Points

• Stock capital gains are subject to separate self-assessment taxation at about 20%, and losses can be carried forward for up to three years.
• **FX (foreign exchange margin trading)** is treated as a financial derivative, so a 20% separate tax rate applies, and you can offset and carry forward gains and losses for three years.
• Crypto assets are taxed as miscellaneous income (comprehensive taxation), so the total income is higher and the tax rate increases as your income rises (progressive taxation).
• The maximum tax rate is 45% income tax (on taxable income over ¥40 million) plus 10% local tax, for a maximum of 55%.

Crypto assets tend to result in a heavier tax burden, and unlike stocks or FX, rarely benefit from preferential tax treatment (lower rates, offsetting, or carryforward deductions). This difference is especially significant for high-income individuals, so tax planning is critical. Most individual investors use the average cost method for calculation.

Handling Losses and Loss Carryforward

If you incur a loss from crypto asset trading, you must pay close attention to how it is handled. If you have positive miscellaneous income in the same year, you can offset it as described above, but even if your total miscellaneous income for the year is negative, you cannot carry that loss forward.

Carryforward deduction is a system for offsetting losses you could not use in one year against income in future years, but this does not apply to crypto asset income. Only certain income types, such as real estate income and business income, are eligible. For example, with business income (sole proprietorship), you can carry losses forward for up to three years by filing a blue return. Similarly, capital gains from stocks and derivatives-related miscellaneous income (such as FX) can be carried forward for up to three years if you file a tax return. However, crypto asset income is not eligible for these preferential measures, and losses cannot be used in future years.

So, what can you do if you incur a loss on crypto asset trading? The next section explains specific tax-saving strategies.

How to Reduce Taxes by Using Losses

In crypto asset trading, you can reduce your tax burden by strategically using annual losses. The main strategies include:

1. Realize Losses (Lock in Losses)

• Sell crypto assets with unrealized losses at year-end to lock in those losses
• Offset against gains in the following year to reduce your tax burden

2. Record Necessary Expenses Properly

• Record transaction fees and communication costs as expenses to reduce your taxable income

3. Consider Incorporation

For individuals, crypto asset income is treated as “miscellaneous income,” but if you incorporate, it is treated as “business income,” making offsetting and loss carryforward possible.

What Does “Realizing Losses” Mean?

Realizing losses means selling crypto assets with unrealized losses by year-end and recording those losses as realized. For example:

• As of December, your Bitcoin (BTC) position is at a ¥300,000 unrealized loss
• You sell the BTC within the same year to lock in the loss
• Offset this loss against gains from crypto asset trades next year to reduce your taxes

Steps for Realizing Losses

• Sell crypto assets with unrealized losses by year-end
• Immediately repurchase the same currency after selling (to realize the gain/loss)
• Record the loss on your tax return

If you continuously trade crypto assets for profit and it is recognized as business income for tax purposes, you may be able to use carryforward deductions by filing a blue return. However, it is difficult for individual crypto asset trading to qualify as business income, so this is rare. In most cases, you must use crypto asset losses within the same year only.

Tax Saving by Recording Expenses

If you incur a loss from crypto asset trading, you can reduce your taxable income and overall tax burden by properly recording eligible expenses. Primary allowable expenses include:

• Transaction fees: Fees and spreads from trading
• Communication expenses: Internet costs for trading
• Information gathering expenses: Paid news subscriptions, professional books
• Equipment expenses: PCs, smartphones, or wallets used for trading (proportionate to business use)

When recording expenses, clearly separate personal and business use and only record the appropriate portion. Also, keep receipts and transaction records for tax audits and file accurate tax returns. Using losses and expenses properly can significantly reduce your final tax bill.

Tax-Saving Potential through Incorporation

For individuals, crypto asset trading is classified as miscellaneous income and cannot be offset. By incorporating and treating the activity as business income, you gain the following advantages:

Incorporation is an effective way to utilize losses and reduce your tax liability from crypto asset trading. Individuals cannot carry forward crypto asset losses, but corporations can carry forward net operating losses (generally up to 10 years) and offset them against future profits. In addition, corporations can offset losses against profits from other business activities within the same fiscal year. For example, if your crypto asset trading incurs a ¥10,000,000 loss but another business earns a ¥10,000,000 profit, the total taxable income for the corporation can be zero.

Risks of Misunderstanding Offsetting Rules

If unreported income or unpaid taxes are discovered, you may face additional taxes and penalties. Main penalty types include:

• Delinquency Tax: Interest for late payment, up to 14.6% per year (varies by timing and circumstances)
• Non-Filing Additional Tax: Imposed for late filing, 5–20% of unpaid tax (reduced to 5% for voluntary late filing, up to 20% for serious cases)
• Underreporting Additional Tax: For underreported tax, 10% of the shortfall (15% on amounts over ¥500,000)
• Heavy Additional Tax: For serious concealment or falsification, 40% of the proper tax (up to 50% for repeat offenders)

These penalties are added to the main tax, so in the case of serious non-filing and heavy additional tax, your liability could be 1.4 times the original tax. Delinquency tax accrues daily, so the longer the delay, the higher the payment. In the worst case, criminal prosecution is possible for willful tax evasion.

Summary: Master the Complexity of Offsetting Gains and Losses in Crypto Assets to Optimize Your Tax Strategy

Offsetting gains and losses in crypto asset trading lets you net profits and losses within a certain period to adjust your taxable income. Unlike stocks or FX, crypto asset profits are classified as “miscellaneous income,” so you cannot offset them with employment or business income, and loss carryforward is not permitted. However, you can offset multiple crypto asset trades and mining or staking rewards within the same year.

For tax planning, selling crypto assets with unrealized losses by year-end to realize those losses is an effective strategy. Incorporation also lets you utilize offsetting and loss carryforward to reduce your tax burden. Sound tax knowledge and following the correct offsetting rules are critical for successful crypto asset investing. Learn, apply, and stay compliant to minimize tax risk and maximize your tax efficiency.

FAQ

What types of income can crypto asset losses be offset against?

Crypto asset losses can be offset against other miscellaneous income (such as affiliate revenue or manuscript fees) within the same year. However, you cannot carry forward those losses to the following year.

What are the steps for offsetting gains and losses to save taxes on crypto assets?

Compile your trading history for the year and calculate your total gains and losses. Within the same year, you can offset losses and gains for all your crypto assets, as well as with other miscellaneous income such as affiliate revenue. Report the results on your tax return and submit it to the tax office. Note that you cannot carry losses forward to the next year.

Can you carry forward crypto asset losses to the following year?

In principle, you cannot carry forward crypto asset losses. However, if your income qualifies as business income and certain conditions are met, loss carryforward may be possible.

Can you aggregate gains and losses across multiple crypto asset exchanges?

You cannot aggregate gains and losses between exchanges. You must calculate the total gains and losses for each exchange. For tax purposes, inter-exchange aggregation is not permitted.

How can you avoid issues with the tax office when offsetting crypto asset gains and losses?

Keep all transaction records and report the gains and losses from all your accounts. Accurately aggregate all miscellaneous income and include all transactions, including those from overseas exchanges, in your tax return. Do not selectively report only certain transactions.