Affiliate Tax & Tax-Return Basics for Kingfin 2026: Miscellaneous Income and the ¥200,000 Rule

What you'll learn in this article

How taxes apply to affiliate payouts (CPA/RevShare), and how to think about the split between miscellaneous income and business income
A full run-through of the tax-return basics: the so-called "¥200,000 rule" for employees, residence-tax filing, expenses, business-registration, and blue-form filing
The points specific to overseas platforms, such as JPY conversion of foreign-currency payouts and building a record-keeping habit (figures and rules are as of 2026)

Key points: frequently asked questions

Q: As an employee, at what income level must I file a tax return for affiliate payouts?: A: An employee receiving salary from a single source is, in principle, required to file a tax return once their total income other than salary and retirement income (i.e. profit = revenue minus expenses) exceeds ¥200,000 per year (the so-called ¥200,000 rule). Note that the test is based on "income," not gross sales. Even if an income-tax return is unnecessary at or below ¥200,000, a separate residence-tax filing is generally still required. Confirm your final obligation with your tax office or a tax accountant.
Q: Is affiliate income miscellaneous income or business income?: A: It depends on whether the activity rises to the level of a "business" by common social standards. Under National Tax Agency guidance, from the 2022 tax year (Reiwa 4) onward, even with revenue of ¥3 million or less it is in principle classified as business income if books and records are retained, and as miscellaneous income related to a business activity if they are not. When starting small it is often miscellaneous income, so consult a tax accountant if you are unsure.

Please read first (general tax information; consult a professional for individual cases)

This article provides general information on taxes and tax returns for individuals earning affiliate payouts. Tax is a specialist field, and the amounts and rules introduced here are nothing more than a summary based on generally available information as of 2026. For any individual tax judgment, always give priority to confirming with a tax accountant, your local tax office, or the National Tax Agency's primary sources. In addition, affiliate results vary from person to person, and no income amount is guaranteed whatsoever. Note as well that what Kingfin promotes are FX and investment-related services, and that investing carries a risk of loss for readers.

Why you need tax knowledge for affiliate payouts too

When affiliate payouts land in your account for the first time, many people pause and wonder, "What about taxes on this?" The short answer: affiliate payouts are, in principle, subject to income tax and residence tax too. "It's online side income, so it doesn't count" or "the money comes from an overseas service, so Japanese tax doesn't apply" — leaving such assumptions unchecked can lead to an under-reported return down the line.

That said, you don't need to aim for perfection from the start. What matters is to learn early whether filing applies to your case and, if so, how to prepare — and to keep records. Taxes look complicated, but the core ideas behind them are not all that many. In this article, we walk through them step by step for individuals who are just starting to earn payouts and for beginners about to get going.

The five themes this article covers

A. Income classification: miscellaneous income or business income — which is it?
B. Whether you need to file: the so-called ¥200,000 rule and residence tax
C. How to think about expenses: what counts as an expense, and what to watch out for
D. Business-registration & blue-form filing: options for running it as a business
E. Foreign-currency payouts & bookkeeping: points specific to overseas platforms

A. Miscellaneous income or business income — which is it?

The first thing to grasp is which "income classification" your affiliate payouts fall into. As a rough rule, it is generally "miscellaneous income" if an employee earns it on the side, and "business income" if you pursue it seriously and continuously as a business. Because the classification changes what benefits you can use (such as blue-form filing) and how things are calculated, it's the first fork in the road.

In 2022 (Reiwa 4), the National Tax Agency tidied up its guidance and set out yardsticks for the test. The key point is whether the activity rises to the level of a "business" by common social standards. According to the published explanation, even when revenue is ¥3 million or less, it is in principle classified as business income if books and records are retained, and it is in principle treated as miscellaneous income related to a business activity if books and records are not retained (applicable to income tax from the 2022 tax year onward).

A rough yardstick (final judgment to a professional)

More likely miscellaneous income: an employee's side hustle that is still small-scale and irregular, with no bookkeeping
More likely business income: pursued continuously and repeatedly, with books and records properly retained
Where revenue is consistently negligible in most years (roughly under 10% of your main income, for example), it may be treated as miscellaneous income; the judgment is made on substance, not just form

Which one applies affects your tax and the schemes you can use. If you are unsure, don't decide on your own assumptions — it's safer to consult your tax office or a tax accountant. Note, too, that organizing when and how payouts are made (the CPA and RevShare mechanisms) makes it easier to grasp your income. For the full picture of how it works, see also Payout Timing and the Withdrawal Flow.

B. Whether you need to file (the ¥200,000 rule and residence tax)

The next most common question is, "Do I even need to file a tax return?" This is where the so-called "¥200,000 rule" often comes up.

For employees (single salary source). If your total income other than employment income and retirement income exceeds ¥200,000 per year, you are in principle required to file an income-tax return. Conversely, at or below ¥200,000 an income-tax return may be unnecessary. Note that the "¥200,000" here is judged on "income (profit)" — revenue minus expenses — not on gross sales.

Residence tax is separate. Even if your income-tax return becomes unnecessary at ¥200,000 or below, a residence-tax filing is generally still required separately. If you file an income-tax return it is reflected in your residence tax, but if you don't, check whether your municipality requires a residence-tax filing. Don't jump to the conclusion that "if it's ¥200,000 or under, I don't have to do anything."

For non-employees / full-timers. For those who receive no salary, or who have income from multiple sources, the ¥200,000 rule won't necessarily apply as is. The conditions differ — for instance, whether there is tax to pay after deducting the basic deduction and so on. The surest way to know which case applies to you is to check the National Tax Agency's guidance or your tax office.

Common misunderstandings about the "¥200,000 rule"

The test is on income (profit after expenses), not gross sales. Even with ¥200,000 in sales, your income drops once expenses are deducted
Even at ¥200,000 or below, a residence-tax filing is often still required
This rule is mainly a yardstick for "employees with a single salary source." Confirm whether it applies to your situation

Note that the tax system is reviewed every year. Amounts such as the basic deduction can be revised, so it's reassuring to make a habit of checking the latest information for the relevant filing year via the National Tax Agency and others.

C. How to think about expenses

Income is calculated as "revenue − expenses." That's exactly why understanding what counts as an expense makes your filing more accurate. The basic test for an expense is whether that spending was "directly necessary in order to earn the affiliate revenue."

Examples that may count as affiliate expenses (general guidance only)

Site-operation costs such as server fees, domain fees, and paid themes
Usage fees for tools used to create or verify articles
A portion of communication costs for research and verification (the share used for the business)
Learning costs needed to run the operation, such as related books and seminar fees

One thing to watch is that anything shared with personal use requires "proration" (anbun). For example, it's hard to expense your home internet line or smartphone bill in full; the basic approach is to expense only the share used for the business. For spending you're unsure about, rather than forcing it onto the books, the safe move is to keep the receipt and check with a tax accountant.

"Just keep it" is the right answer for receipts and records

Even for items where it's unclear whether they qualify as expenses, it's best to not throw away receipts and payment records, but keep them. If you later find out "this could have been an expense," you can't prove it without a record. Just dropping them into a folder once a month makes the year-end burden far lighter.

D. An overview of business-registration and blue-form filing

If you intend to pursue affiliate marketing seriously as a business, two things worth knowing are the "business-registration notice (kaigyo todoke)" and "blue-form filing (aoiro shinkoku)." Both are for people who file as business income. They aren't suddenly mandatory for beginners, but once your scale grows they're worth considering.

Business-registration notice. This is a document that notifies the tax office you've started a business; in principle it is submitted within one month of starting the business. While submission is partly optional, it becomes a prerequisite for using blue-form filing. It also matters if, for example, you want to operate under a trade name.

Blue-form filing. On the condition that you keep books under set rules such as double-entry bookkeeping, this is a scheme that grants benefits such as the blue-form special deduction. As of 2026, meeting the requirements is said to allow a deduction of up to ¥650,000 (subject to requirements such as e-Tax filing and electronic bookkeeping retention; ¥550,000 or ¥100,000 for simpler bookkeeping). To use it, you generally need to submit an "Application for Approval of Blue-Form Filing" in advance.

The deduction amount is set to change (always check the latest)

The amount and requirements for the blue-form special deduction change with tax reforms. As of 2026 it is said to be up to ¥650,000, but there is also discussion pointing toward revisions to the deduction amount and electronic-bookkeeping requirements in subsequent reforms. For the requirements and amounts in your actual filing year, always confirm with the National Tax Agency's latest information or a tax accountant. The figures in this article are general yardsticks as of 2026.

While blue-form filing has its appeal, it also involves effort, such as bookkeeping by double-entry. First weigh the scale of your income and the likelihood of continuing, and consider it after deciding "whether to settle in and treat this as a business." As a topic for the stage when payouts have grown steadily, it's best to think long-term alongside Building Systems to Grow Your Revenue.

First, see the payout mechanics with your own eyes

You can only get the tax picture straight once you understand "how much you earn, and when and how it's paid." Registering for Kingfin's affiliate program is free, with no inventory and no upfront capital. Seeing the difference between CPA and RevShare and the dashboard for yourself makes later bookkeeping smoother, too. No results or income amounts are guaranteed.

There is no cost whatsoever / no results or income amounts are guaranteed

E. Foreign-currency payouts, overseas remittances, and building a bookkeeping habit

When you do affiliate marketing via an overseas platform like Kingfin, payouts may be made in USD or remitted from overseas. Here, the things to watch are JPY conversion and how you handle records.

Convert foreign currency to JPY when filing. USD-denominated revenue is, in principle, converted into JPY at the exchange rate on the date the transaction should be recorded (the TTM, or mid-rate, published by financial institutions is commonly used) and reported as income. "It's an overseas deposit, so it doesn't matter in Japan" is a misunderstanding: residents of Japan are in principle subject to filing in Japan.

Exchange differences can create gains or losses. If the exchange rate moves between when the payout is confirmed and when the funds actually arrive in your domestic account, that difference may be treated as a foreign-exchange gain or loss. It may feel trivial while amounts are small, but it can't be ignored once they grow. Recording the remittance date, the amount received, and the rate makes it easier to sort out later.

Make bookkeeping a habit. The foundation of any tax planning is, ultimately, "daily records." Build a habit of recording the payout date, the amount (in foreign currency and JPY), expense payments, exchange rates, and so on — even just once a month is fine. Accounting software can automate foreign-currency and exchange calculations to some extent. With records in hand, both filing and consulting a tax accountant go smoothly.

Small steps you can take today

Save a screenshot or statement of your payout dashboard once a month
Gather expense receipts into a single folder (digital is fine)
For foreign-currency payouts, note the "confirmation date, arrival date, rate, and JPY-converted amount"
Once the scale comes into view, consult a tax accountant early on

A basic checklist to prepare for your tax return

Finally, here's a summary of the points worth reviewing once payouts start coming in. You don't need to do everything at once. Start by checking "which of these applies to me."

1 Classification: grasped the yardstick for whether your activity is closer to miscellaneous income or business income

2 Need to file: as an employee, checked the "income over ¥200,000" yardstick (income, not sales)

3 Residence tax: understood that a residence-tax filing may be needed even at ¥200,000 or below

4 Expenses: keep operating-cost receipts, with the premise of prorating anything shared with personal use

5 Registration & blue form: if going pro, grasped that business-registration and blue-form filing exist, and their requirements

6 Foreign currency: mindful of JPY conversion (TTM, etc.) and the handling of foreign-exchange gains and losses for USD payouts

7 Bookkeeping: started a habit of recording payouts, expenses, and rates once a month

8 Who to ask: decided that when in doubt, you'll confirm with the tax office, the National Tax Agency, or a tax accountant

Taxes tend to get put off as "they seem hard," but the earlier you build a record-keeping habit, the easier things become later. This article is general information only; for individual judgments, give priority to the primary sources of a tax accountant, your tax office, and the National Tax Agency. And don't forget the premise that affiliate results vary from person to person and that no income amount is guaranteed — keep going at a sustainable pace.

Frequently Asked Questions (FAQ)

I'm a company employee. At what level of affiliate income do I need to file a tax return?

If you are an employee receiving salary from a single source, you are generally required to file a tax return once your total income other than employment income and retirement income (your affiliate profit = revenue minus expenses) exceeds ¥200,000 per year. This is the so-called "¥200,000 rule." Note that the ¥200,000 is judged on the amount of income after deducting expenses, not on gross sales. Even when an income-tax return is unnecessary because you are at or below ¥200,000, a separate residence-tax filing is generally still required. Because the final obligation depends on your individual situation, we recommend confirming with your tax office or a tax accountant.

Is affiliate income classified as miscellaneous income or business income?

Classification depends on whether the activity rises to the level of a "business" by common social standards. Under National Tax Agency guidance, from the 2022 tax year (Reiwa 4) onward, even when the revenue tied to that income is ¥3 million or less, it is in principle classified as business income if books and records are retained. Conversely, if books and records are not retained, it is in principle treated as miscellaneous income related to a business activity. When starting small as a company employee's side hustle it is often miscellaneous income, and one yardstick is whether you run it continuously and repeatedly as a genuine business with proper bookkeeping. Because the classification also affects your tax, consult a tax accountant if you are unsure.

How do I convert USD-denominated affiliate payouts into JPY when filing?

Foreign-currency revenue is, in principle, converted into JPY at the exchange rate on the date the transaction should be recorded (the TTM, or mid-rate, published by financial institutions is commonly used) and reported as income. If the rate differs between when the payout is confirmed and when the funds actually arrive in your domestic account, you may need to account for the difference as a foreign-exchange gain or loss. Even for payouts received via an overseas platform, residents of Japan are in principle subject to filing in Japan. Because the handling of exchange rates and remittances tends to get complicated, the safe approach is to keep records and then confirm with a tax accountant or your tax office.

How much is the blue-form special deduction as of 2026?

As of 2026, for business income and the like, meeting certain requirements (bookkeeping by double-entry, filing within the deadline, electronic filing via e-Tax or electronic bookkeeping retention, etc.) is said to allow a blue-form special deduction of up to ¥650,000. There are tiers such as ¥550,000 where some requirements are not met, and ¥100,000 for simple bookkeeping. However, these amounts and requirements may be revised through tax reforms, and there is also discussion pointing toward changes to the deduction amount and electronic-bookkeeping requirements in subsequent reforms. For the exact amount and requirements in your actual filing year, always confirm with the National Tax Agency's latest information or a tax accountant.

[Disclaimer] This article is informational and educational content by the Kingfin English Editorial Team and does not constitute tax or legal advice. The schemes and amounts described (the so-called ¥200,000 rule, the split between miscellaneous income and business income, the amount of the blue-form special deduction, JPY conversion of foreign-currency payouts, and so on) are a summary based on generally available information as of 2026, and do not guarantee their application to any individual case or any final interpretation. The tax system may be revised every year, and the amount and requirements of the blue-form special deduction are subject to planned revisions and ongoing discussion. For your actual filing, always give priority to confirming with the National Tax Agency's primary sources, your local tax office, or a professional such as a tax accountant. In addition, this article does not indicate that you will "definitely earn" through affiliate marketing; results vary from person to person, and no income amount is guaranteed. What Kingfin's affiliate program promotes are FX and investment-related services, and investing carries a risk of loss.

Author

Hiro Hiraki

Editor-in-Chief, Kingfin JP. An FX affiliate specialist with over 15 years in finance and FinTech translation. Bilingual in Japanese and English.