Income tax returns in Japan: do you actually need to file?

For most employees in Japan the answer is no — your employer already settles your income tax for you. But several situations flip that to a yes, and a few make filing worth your while even when it isn’t required. Here’s the line, straight from Japan’s National Tax Agency (NTA).

The default: year-end adjustment (nenmatsu chosei)

If you’re a salaried employee with one employer, your income tax is reconciled at year end by that employer.

“the calculation and payment of income taxes are completed through the year-end adjustment by the person paying the salary” (National Tax Agency)

That’s why most company employees in Japan never touch a tax return: withholding through the year, then a small top-up or refund in December via nenmatsu chosei. You hand your employer deduction paperwork (dependents, insurance, etc.); they do the maths.

When you must file a return (kakutei shinkoku)

The NTA lists the situations where an employee has to file anyway. The common ones:

• High salary: “Your total earnings from employment exceeds 20 million yen.”
• Side income: you must file if “your total income (excluding employment income and retirement income) exceeds 200,000 yen.”
• More than one employer: if you draw salary from a second employer, you generally must file when that secondary salary plus other income exceeds ¥200,000 for the year (NTA).

When a return is required, the window is fixed:

“between February 16 and March 15 of the following year” (National Tax Agency)

Not required — but filing can get you money back

Even if you don’t have to file, a refund return can be worth it:

“the amount of taxes withheld from salaries and wages or the amount of estimated tax prepayment exceeds the income tax calculated based on your annual income for the year” (National Tax Agency)

Typical reasons the withheld amount ends up too high: large medical expenses, a housing-loan credit, a casualty loss, or donations — deductions your employer’s year-end adjustment didn’t capture.

Leaving Japan mid-year

Departing partway through the tax year has its own rule, and it can mean paying before you fly:

“If you leave Japan without submitting the Notification of Tax Agent, you must file a quasi-final return and pay the tax before departure.” (National Tax Agency)

“If you submit the Notification of Tax Agent before departure, you must file the tax return and pay the tax for the year through the tax agent between February 16 and March 15 of the following year.” (National Tax Agency)

So the choice is: settle up before you go, or appoint a tax agent in Japan to handle it on the normal timetable.

This isn’t resident tax (juminzei)

National income tax and local resident tax are two different taxes. JETRO describes individual inhabitant (resident) tax as “the collective term for prefectural tax and municipal tax on individual income,” and notes that “persons submitting self-assessed income tax returns do not have to file again for individual inhabitant tax.” Resident tax also has a timing trap of its own — see our resident tax guide.

Frequently asked questions

Thresholds and dates above reflect the NTA’s English guidance as of 2026-07-13; tax figures can change year to year. This is general information, not individual tax advice — for your own return, confirm the current-year rules on the NTA site or with a licensed tax professional (zeirishi).