Details have been rounded and anonymised. Dates are given by month, the amount is approximate, and nothing here identifies the parties. The sequence is otherwise as it happened.

What happened, month by month

A secondhand apartment in Osaka Prefecture, bought by someone living outside Japan. The purchase itself went through without difficulty.

Registration to payment deadline: about five months. The owner received nothing directly during that period, and had no way of knowing that a clock had started.

Why the letter did not go to the owner

The tax office was not guessing. An overseas address on the property register is visible to them, and it tells them exactly what they need to know: this owner has no address in Japan, so somebody in Japan needs to be appointed to deal with the paperwork.

Where the letter goes depends on what contact information exists. In this case it reached a Japanese company connected to the transaction. In other cases it goes to the registered overseas address, which introduces its own problem. International post takes time. When it arrives it is in Japanese. And even once translated, it does not explain how a person outside Japan is supposed to pay a Japanese prefectural tax.

Those three things stack, and the deadline passes while they are still stacking.

The relief that was not applied

Japan does have relief from acquisition tax for residential property. In this case the assessment came through with none of it.

There are two separate reasons this happens, and it is worth knowing which one applies to you before you buy rather than after.

The first is that relief has to be claimed. It is not applied automatically because you qualify. A filing is required, within a period set by the prefecture, and prefectures set that period differently. Miss it and the assessment stands as issued.

The second is that many overseas purchases do not qualify at all. For secondhand homes, the relief is generally built around the buyer living in the property. A purchase made to let out, or to keep as a holiday home, falls outside that as a rule. Buyers who have read that relief exists are often reading about a relief that was never available to them.

There are further conditions attached, and one of them changed recently. The floor area requirement for the relief was relaxed with effect from acquisitions made on or after 1 April 2026, from a lower limit of 50 square metres to 40 square metres, with the upper limit remaining at 240. This applies nationally rather than being a local rule. Anything written before that date, including a good deal of what is currently online, still states the old figure. Buildings constructed before 1 January 1982 also need certification that they meet the current earthquake standard.

The two weeks

The hardest part of this case was not the forms. It was the calendar.

Between reading the letter and the deadline, the following had to happen: reach the owner overseas, explain a system they had never encountered, establish who would act as their tax representative, obtain that person's agreement, collect their signature, and file.

A tax representative cannot be appointed by simply writing down a name. The person taking the role signs the notification themselves, which means they must be found, asked and persuaded, in that order. Across a time difference, in a second language, in under fifteen days.

It was completed. But there was nothing left over, and a single unanswered email would have been enough to lose it.

What would have prevented all of it

One decision, made before completion, at a moment when nobody is under any pressure at all: deciding who receives Japanese post on your behalf and confirming that they agree to it.

That is the whole intervention. It costs nothing at the time and it removes the two-week emergency entirely, along with the late charges that follow if the emergency is not resolved.

The wider mechanics, including why one appointment may not be enough and what happens to rental income paid to an overseas owner, are set out in the tax paperwork nobody mentions before you buy.