My family went through inheritance procedures in Japan last year after my father passed. Nobody in my family is a lawyer, and the paperwork is scattered across tax offices, banks, the family court, and the pension office, each with different forms and different deadlines. I ended up treating the whole thing like a project with hard deadlines and back-scheduled tasks, because that was the only way I could keep track of what was actually urgent versus what could wait.
Start from the deadlines, not the tasks
The instinct is to make a task list first and worry about dates later. That's backwards for this specific kind of paperwork, because in Japan several of the deadlines are legally fixed and non-negotiable, counted from the date of death or the date you became aware of the inheritance. I made the mistake of starting with tasks and only later realized two of them had already eaten a third of their deadline window without me knowing it.
The three deadlines that actually drove my schedule
There's a short window for deciding whether to accept or renounce the inheritance (the point of no return if debts are involved), a mid-length window for the deceased's final income tax filing, and a longer window for the inheritance tax filing and payment itself. Each of these has its own required documents, and some of those documents (like family register copies) take weeks to obtain, which means the "deadline" is really an earlier working deadline once you subtract document lead time.
Back-scheduling from each deadline
For each of the three, I worked backward: deadline date, minus document-gathering lead time, minus the time to get any signatures from other heirs, equals the date I actually needed to start. Written out as a plain checklist, this made it obvious that the shortest legal deadline required the earliest start, even though it looked less urgent on the calendar at first glance.
Keeping heirs in sync
Multiple heirs means multiple people who need to agree on documents and signatures, often before you can even submit anything. I kept a single shared plain-text status log — what's requested, what's received, what's blocking whom — because a phone thread alone lost track of who last confirmed what.
I ended up cross-referencing our internal deadline list against a public deadline summary at souzoku-baton.jp partway through, mostly to double check we hadn't miscounted the start date for one of the windows — it's easy to get that date wrong when a death is recent and everyone is stressed.
None of this makes the process painless. But scheduling backward from fixed deadlines, instead of forward from a task list, is the single change that kept us from missing something with real financial consequences.
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