The problem is not the tax. It is the letterbox.

Japanese tax authorities communicate on paper, in Japanese, to an address in Japan. There is no international mailing, no English notice, and no assumption that the recipient might be somewhere else.

For an overseas owner this produces a specific and avoidable failure. A demand is issued. It arrives at a property nobody occupies, or at an old address, or is returned undelivered. Nothing is paid because nothing was seen. Late payment charges accumulate against a person who never knew a bill existed.

The system anticipates this, and it has a mechanism for it. The mechanism has a name most foreign buyers hear for the first time after completion, if at all.

Appointing a tax representative is an obligation

The role is called a tax representative or tax agent (nōzei kanrinin, 納税管理人). It is a person or company resident in Japan, appointed by you and notified to the tax authority, who handles tax matters on your behalf while you are elsewhere.

The wording of the national statute matters here. Where a taxpayer has no address or residence in Japan and there are tax matters to be processed, that person must appoint a tax representative. It is written as a duty, not as an option. The appointment is then notified to the tax office on a prescribed form.

A 2021 amendment strengthened this further. Where someone who should have appointed a representative has not done so, the tax office may set a deadline and require the notification, and may approach a party in Japan connected to the matter and ask that party to take the role. Leaving the position vacant is not a way of leaving the system.

You may need three appointments, not one

This is the part that surprises almost everyone, and it follows from how Japanese taxation is structured. Property generates taxes at three levels of government, and those three do not share an appointment between them.

Each of those is a separate authority with its own procedure. A notification filed with the national tax office does not reach the prefecture, and neither of them reaches the city. The forms differ, the offices differ, and the local ones are set by each local government rather than by a single national rule.

Some municipalities also operate a filing that exempts you from appointing a representative where certain conditions are met. Osaka City is one of them. That is useful, and it is entirely invisible unless you already know to ask whether such a filing exists where your property sits.Where that exemption applies, and where it does not, is set out in can you avoid appointing a tax representative in Japan.

The practical consequence is that the question is never simply "do I need a tax representative in Japan". It is "which of these three do I need one for, and what does this particular prefecture and this particular city require".

A tax representative is not a tax accountant

These two roles are constantly confused in English, partly because the official English translation of the Japanese term is "tax agent", which sounds a great deal like someone who does your taxes.

The distinction is legal, and it is firm. A tax representative receives official documents, pays tax, receives refunds and submits filings on your behalf. Anyone resident in Japan and suitably placed can be appointed.

Tax representation, the preparation of tax documents and tax consultation, carried out as a business for compensation, are reserved to certified tax accountants (zeirishi, 税理士). That reservation exists to protect taxpayers, and it means an unqualified company cannot decide your tax position for you, however it labels the service.

In practice, for an owner who does not rent the property out, a representative to receive and settle the annual bills is often the whole requirement. For an owner with rental income, an annual return is involved, and that is where a tax accountant becomes necessary alongside the representative rather than instead of them.

If you rent it out, a fifth comes off the top

This one has real consequences for cash flow, and it is almost never explained to overseas buyers before they sign.

When rent for Japanese property is paid to an owner who is not resident in Japan, the person paying the rent is required to withhold tax at 20.42 per cent and remit it to the tax office. The obligation sits with the payer, not with you. You receive the remainder.

There is one exception, and it is the one that decides whether this affects you at all. Where the tenant is an individual renting the property as a home for themselves or a relative, no withholding is required.

So the shape of it is this. A family renting your house to live in: no withholding. A company renting the same house as accommodation for staff, or as an office: 20.42 per cent withheld every month before the money reaches you.

The withheld amount is not lost. It is tax paid in advance, and it is settled when the annual return is filed. If more was withheld than was due, the difference is refunded. But the refund requires a filing, the filing requires a representative to submit it, and the money is out of your hands in the meantime.

The same applies when you sell

On a sale by a non-resident owner, the buyer is generally required to withhold 10.21 per cent of the price and remit it, with the seller settling the position through a return afterwards. The exception here is a sale at or below one hundred million yen to an individual buying it as a home for themselves or a relative.

If you are modelling a sale, that withholding sits between the contract price and the money arriving in your account. It is worth knowing before you plan around the proceeds.

What to do before completion, not after

Almost every difficulty described above is cheap to prevent and expensive to fix. The work belongs before you complete, while you still have everyone's attention.

• Establish which prefecture and which municipality the property sits in, and what each of them requires from a non-resident owner.
• Find out whether the municipality operates an exemption filing, and whether you qualify.
• Decide who will be your representative and confirm they will accept before you need them.
• Fix a reliable address for official correspondence. An unoccupied property is not one.
• If you intend to rent the property out, establish whether your likely tenant triggers withholding, and engage a tax accountant early rather than in the week before the filing deadline.

The acquisition tax is worth modelling in advance as well, since it arrives as a single demand months after everyone has moved on. Our cost estimator covers it alongside the other one-off costs of buying.

And if you are still deciding on the property itself, the checks that belong before an offer are set out in what you must verify yourself before buying, and the wider process in the full guide to buying property in Japan as a foreign buyer.