Quick Answers
We invoiced 100 and received 79.58. What happened?
Tax was withheld at source. Under Japanese rules, a person who pays certain domestic-source income to a foreign company in Japan withholds tax at the moment of payment and remits it to the tax office — the obligation belongs to your customer, not to you, and it is not something they can waive as a courtesy. The National Tax Agency publishes the rates by category, and the rate shown for royalties on industrial property rights, copyright and the like is 20.42%. The figures in the headline are simply that rate applied to an invoice of 100; the currency is irrelevant.
Can we get it back, or stop it happening again?
Possibly both, and the two routes are different. Going forward, relief under a tax treaty is claimed on a notification form — Form 3 for royalties — which the non-resident files through the payer, to the tax office for the payer's place of tax payment, by the day before the first payment is received. Backwards, where that notification was not filed in time, there is a refund claim — Form 11 — travelling by the same route. Both depend on a prior question that no public page answers for you: whether what you are being paid for is a royalty in the first place. That is a question for a Japanese licensed tax accountant, settled before you sign.

TL;DR

You have no office and no staff in Japan, so Japanese tax was not on the entry plan. Then the first remittance lands short. What happened is withholding at source: the Japanese payer of certain domestic-source income to a foreign company is obliged to withhold at the time of payment, and the National Tax Agency's published rate for royalties on industrial property rights, copyright and the like is 20.42%. The hard part is not the rate. It is that whether your own subscription revenue belongs in that category, or is business profits that a treaty may treat differently, is not resolved by any single public page — it depends on your contract, your facts and your country's treaty with Japan. That makes it a question to settle before you sign, with a Japanese tax professional and with your customer's accounting department, rather than a question to discover from a bank statement. And if relief does apply, the notification claiming it is due through the payer by the day before your first payment, which is days after signature, not months.

Key Takeaways

The Amount Was Right. The Remittance Was Not.

The Japan deal closed cleanly. The contract is countersigned, the service is live, the invoice passed their accounting check on the first attempt. Your finance team is expecting the money on a date it can name.

The money arrives on time. It is short by about a fifth.

The first assumption in the room is a bank charge, and it is not that. The second is that the customer applied a discount nobody agreed to, and it is not that either. What has happened is that your customer, at the moment it paid you, withheld Japanese tax and remitted it to a tax office. The invoice was never disputed. The gross amount was accepted in full. A portion of it simply went somewhere other than your account.

The most useful thing to understand in the first hour is that this is not a negotiation. Your customer did not choose to do it.

The scenario above is a composite of a pattern I see repeatedly in Japan market entry work rather than a specific client. The figures in the title are an illustration of the arithmetic — the published rate applied to an invoice of 100 — not a real invoice, and the currency makes no difference to the mechanism.

Why Your Customer Cannot Simply Pay the Full Amount

The National Tax Agency states the position without much room in it: a person who, in Japan, makes a payment of domestic-source income subject to withholding to a non-resident or a foreign corporation has an obligation to withhold and remit the tax at the time of that payment.

Read that from your customer's side of the desk. The person processing your payment is not deciding whether to be generous. They are discharging a duty that attaches to them, personally and institutionally, and if they get it wrong the exposure is theirs rather than yours. That is why a polite request to "just pay the full amount and we'll sort out the tax at our end" goes nowhere, and why it can damage the relationship: to them it reads as a request to take on a liability on behalf of a vendor who has not done their homework.

It also explains the silence. Nobody flagged it in advance because, from inside a Japanese finance department, withholding on a payment to an overseas company is ordinary. It is not news. The only party for whom it is news is the one reading the bank statement in another timezone.

Where the 20.42% Comes From

Three pieces sit behind the number, and they are worth separating because entry teams routinely collapse them into one.

First, scope. A foreign corporation is taxed in Japan on Japanese-sourced income, and the National Tax Agency sets out what falls within domestic-source income as a list of categories. Only items on that list are in play at all.

Second, category. One of those categories is royalties. The Ministry of Justice's official English translation of the Income Tax Act renders the relevant item of Article 161, paragraph 1 as covering royalties or consideration received from a person who performs operations in Japan, pertaining to those operations — industrial property rights, copyright and the like, together with consideration for their transfer.

Third, rate. The National Tax Agency publishes the withholding rates by category, and for royalties on industrial property rights, copyright and the like the figure it shows is 20.42%. Apply that to an invoice of 100 and 79.58 arrives. That is the whole of the headline.

Having no office in Japan does not take you out of this

The intuition most entry teams carry is that tax begins when you incorporate or hire. It does not. What a permanent establishment changes is the mechanism, not the existence of the liability. The National Tax Agency describes the split plainly: domestic-source income attributable to a permanent establishment is, as a rule, subject to withholding and then to comprehensive taxation, while income not attributable to one is, as a rule, subject to separate withholding taxation. For a company with no presence in Japan, in other words, withholding is not the first step in a process. It is the process.

The same page is worth a second look for a different reason: it notes that whether a permanent establishment exists is judged on functional rather than formal grounds. Companies that are confident they have none because they have no lease sometimes have less certainty than they think, and that too is a question for an adviser rather than a slide.

The Question No Public Page Will Answer for You

Here is the part that decides everything, and the part that is almost always skipped.

The rate for royalties is published. The list of domestic-source income categories is published. What is not published — anywhere, in a form you can point at — is whether the monthly fee your Japanese customer pays for access to your platform is a royalty at all, or business profits of a kind a treaty may treat quite differently.

That characterisation turns on facts nobody outside your contract can see. What is the customer actually acquiring: a right in a copyrighted work, or a service delivered over a network? Is any software installed on their side, or licensed to them in any conventional sense? What does the agreement say it is granting, in its own words? And what does the treaty between Japan and your country say about each category, since the two categories can lead to entirely different outcomes?

I am not going to tell you the answer, and you should be sceptical of anyone who gives you one without reading your contract. What I will say is what the practical consequence of leaving it open looks like. Two parties will eventually form a view: your tax adviser, and your customer's accounting department. If those views differ, the customer's view is the one that governs the money, because the customer is the party carrying the obligation and the risk. You will then be arguing, after the fact, with a counterparty who has already remitted the tax to a tax office and has no mechanism for unwinding it on your say-so.

Which is why this belongs on the pre-signature checklist and not the post-invoice one. Reach a position with a Japanese licensed tax accountant, get it in writing, and put it in front of the customer's accounting team before the first invoice — not as an instruction, but as a question: this is our understanding of the treatment; is it yours? A disagreement discovered at that point costs an email. Discovered later, it costs a fifth of a remittance and a conversation about competence.

This article is a general description of how the mechanism works, not tax advice. How your own income is characterised, which treaty applies, what rate results, and how and when to file are matters for a Japanese licensed tax accountant or the competent tax office before you act.

Form 3, and a Deadline Measured in Days

Japan has tax treaties with a large number of countries, and where one applies it can reduce or remove the withholding that domestic law would otherwise impose. The relief is not automatic. It is claimed on a notification form, and the form has a route and a deadline that surprise almost every foreign vendor the first time.

The National Tax Agency explains that the notification differs according to what is being paid — dividends on Form 1, interest on Form 2, and royalties on Form 3 — and sets out the mechanics: the non-resident prepares a notification for each payer and submits it, through the payer, to the district director of the tax office for the payer's place of tax payment, by the day before the day on which the income is first received. Where it has not been filed by then, the same page is explicit about the consequence: the payer withholds at the rate under domestic law rather than at the limit rate in the treaty.

The agency's procedural page for the royalties notification — filed as A3-5 — repeats the timing and adds the paperwork: on paper, the notification is prepared in duplicate and given to the payer of the royalties, who submits the original to the district director of its own tax office. Depending on the treaty, an attachment table covering a limitation-on-benefits article may be required as well, and a residency certificate from the competent authority of your country comes into it. The same route applies again if the details you filed subsequently change.

Three things follow from this that matter more than the form itself.

The deadline lands next to signature, not next to year end. The first payment under a new contract is typically weeks away. Anything in your process that treats tax paperwork as a quarterly task will miss it.

Your customer is inside your tax filing. The notification physically travels through them. That means a Japanese accounting department has to be told, in advance, that a document will arrive from a foreign vendor which they are expected to submit to their own tax office. Handled early, this is routine. Sprung on them the day before a payment run, it is not.

What the treaty actually does varies by country. Limit rates differ from treaty to treaty, and some provisions differ by category of income within the same treaty. Do not assume a particular outcome because a colleague in another market had one — check the treaty between Japan and your country. The Ministry of Finance maintains the list of Japan's tax conventions, and reading the applicable one with an adviser is the only reliable way to find out what it gives you.

If the Deadline Has Already Passed

Most companies reading this are reading it after the fact, so it is worth being clear that the door is not closed.

The National Tax Agency describes a refund route for exactly this situation. Where a non-resident's income was eligible for treaty relief but tax was withheld under domestic law because the notification had not been filed in time, the non-resident may file a refund claim — Form 11 — through the payer to the district director of the tax office for the payer's place of tax payment, claiming back the difference between the amount withheld under domestic law and the amount that would have applied with the reduction or exemption. The notification form and copies of documents from which the payment can be confirmed are attached to the claim.

Two practical notes. The refund is, in principle, made to the non-resident who filed the claim; having an agent receive it involves a power of attorney with a translation. And the page sets out the route and the attachments without stating a filing deadline, which is a reason to ask the tax office or your adviser what applies to your case rather than to assume the window is open indefinitely.

Note also what the refund route costs you that the notification route does not: it travels through your customer a second time. You are asking an accounting department that has already remitted tax on your behalf to now handle paperwork recovering it. They will do it. They will also remember that they did it, and the memory will be present at renewal.

What to Settle Before You Sign

None of this needs a Japanese entity, and none of it needs headquarters' permission to start.

The pattern underneath is the one that runs through everything after signature in Japan. The deal is agreed with a business unit; the consequences are administered by departments that never met you and are not adjusting anything for a vendor they have not dealt with before. It is the same shape as the invoice that comes back from accounting, as procurement and the internal approval trail, and as the security review that arrives after the deal is agreed. Signature is a handover, not a finish line.

A Japan Readiness Check reads your Japanese-facing material the way the departments after the signature read it — including the documents that decide how much of your invoice actually reaches you.

Frequently Asked Questions

We invoiced 100 and received 79.58. Did our Japanese customer underpay us?

Almost certainly not. Under Japanese rules a person who pays certain domestic-source income to a non-resident or a foreign corporation in Japan is obliged to withhold tax at the time of payment and remit it to the tax office. The National Tax Agency publishes the rates by category of income, and for royalties on industrial property rights, copyright and the like the rate shown is 20.42%. The shortfall you are looking at is not a discount your customer took, it is tax the customer was required to withhold and hand over. Ask them in writing to confirm the amount withheld and the category they applied it under, and take that answer to a Japanese tax professional. This article is a general description of the mechanism, not tax advice.

Is our SaaS subscription fee a royalty for Japanese withholding purposes?

That is exactly the question you should settle before the contract is signed, and it is not one a public page settles for you. The National Tax Agency's pages tell you the rate that applies to royalties and the categories that count as domestic-source income; they do not tell you which category a particular subscription agreement falls into. The answer turns on what your customer actually acquires, how the contract is drafted, whether any right in a copyrighted work is licensed, and what the applicable tax treaty says. Two parties will form a view — your tax adviser and your customer's accounting department — and in practice the customer's view governs the remittance, because the withholding obligation is theirs. Get a Japanese licensed tax accountant to reach a position in writing, and show it to the customer's accounting team before the first invoice.

How do we claim tax treaty relief, and when is it due?

Relief under a tax treaty is claimed by filing a notification form. The National Tax Agency explains that the form differs by type of payment — dividends use Form 1, interest Form 2, and royalties Form 3 — and that the non-resident prepares one for each payer and submits it, through the payer, to the district director of the tax office for the payer's place of tax payment, by the day before the first payment of that income is received. If it is not filed by then, the payer withholds at the rate under domestic law rather than the limit rate in the treaty. That deadline is the part foreign vendors underestimate: it falls days after signature, not at year end, and it requires cooperation from your customer, because the document travels through them.

We already missed the deadline. Is the money gone?

Not necessarily. The National Tax Agency describes a refund route: where a non-resident's income qualified for treaty relief but tax was withheld under domestic law because the notification had not been filed, the non-resident may file a refund claim — Form 11 — through the payer to the district director of the tax office for the payer's place of tax payment, claiming the difference between the two amounts. The notification form and copies of documents evidencing the payment are attached to it. Two practical notes: the claim travels through your customer as well, so it is another request you are making of their accounting team, and the page does not state a filing deadline, which is a reason to ask the tax office or your adviser rather than to assume there is none.

Is this article tax advice, and where do the facts come from?

It is not tax advice. It is a general description of how the withholding mechanism and the treaty notification route work, written for people running a Japan entry, and any decision about how your own income is characterised, which treaty applies, what rate results, or how and when to file should go to a Japanese licensed tax accountant or the competent tax office before you act on it. The figures and procedures here come from the National Tax Agency's own pages on withholding for non-residents, on the tax treaty notification form and on the refund claim, from the Ministry of Justice's official English translation of the Income Tax Act, and from the Ministry of Finance's list of Japan's tax treaties — all linked in the article. The amounts in the title are an illustration of the arithmetic, not a real invoice, and the opening scenario is a composite rather than a specific client.