The Japanese Company Filing Year

A company in Japan has a rhythm to its year. Once you know it, the administration becomes predictable and mostly boring, which is the goal.

The reason it feels chaotic in year one is that nobody lays out the calendar. You get told about deadlines individually, as they arrive, usually by a letter in Japanese.

You choose your own fiscal year

Unlike your personal tax year, which is fixed to the calendar, a company sets its own accounting period when it incorporates.

Most Japanese companies close in March, which is why the whole country's business calendar has a bulge at the end of that month. You do not have to follow it. Many small companies deliberately avoid a March close so that their accountant is not at their busiest when they need attention.

A useful trick when incorporating: set the fiscal year end so that your first period runs close to a full twelve months rather than ending a few weeks after you start. Some of the early tax exemptions available to new companies are measured in periods rather than months, and a very short first period spends one of them cheaply.

The close, and the two months after it

After your fiscal year ends, the corporate tax return is generally due within two months. That single deadline pulls several filings with it: national corporate tax, local corporate inhabitant tax, and enterprise tax, filed to different authorities.

An extension of the filing deadline is available on application in common circumstances, but be aware it usually extends filing rather than the obligation to pay, so interest can accrue on tax paid late.

Before any of that, you produce financial statements: balance sheet, profit and loss, and supporting schedules. This is the work, and it is why almost every company here retains a 税理士 rather than filing themselves. Corporate tax filing in Japan is not a form you complete in an evening.

If your company is a 株式会社, you also have obligations around approving accounts and, formally, publishing them. Enforcement of the publication requirement has historically been light, and that is not a reason to be casual about it.

Consumption tax runs on its own track

If you are registered for consumption tax, that filing is separate, with its own deadline, generally also within two months of the period end.

Depending on your size you may have to make interim payments during the year rather than one payment at the end. Companies discover this when a payment notice arrives for a tax they thought was annual.

Monthly and twice yearly obligations

Withholding tax. If you pay salaries, you withhold income tax and remit it, in principle by the tenth of the following month. A small company with few employees can apply to remit twice a year instead, in January and July, which is a significant reduction in administrative noise and worth doing.

Social insurance premiums are paid monthly, by direct debit, once you are enrolled.

The July update. Social insurance contributions are recalculated once a year based on salaries paid in the spring, in a procedure filed in July. Your monthly premiums then change from the autumn. If you gave raises, the cost of them lands later than you expect.

Year end adjustment

In December, an employer performs 年末調整 for its employees. This reconciles the tax withheld during the year against what was actually owed, taking into account insurance deductions, dependents, and other items.

It means collecting declaration forms from every employee, and the deduction certificates that support them, in November or early December. For most employees this replaces the need to file a personal tax return, which is why it matters to them and why doing it late is unpopular.

Directors of your own company are employees for this purpose too. If you draw a salary, you are in the system.

The taxes you pay even when you lose money

This is the part that catches founders who assume no profit means no tax.

Local inhabitant tax has a per capita portion (均等割) that is assessed on the company's capital and number of offices, not on its profit. A company with no income still owes it, and the common figure for a small company in one location is in the region of seventy thousand yen a year, varying by municipality and capital size.

So a dormant company is not a free company. If a business is finished, closing it properly is cheaper than leaving it sitting there generating an annual bill.

The practical setup

Three things make the year manageable.

Get a 税理士 before you need one. Monthly bookkeeping plus the annual close is the standard arrangement for a small company and the cost is predictable. Trying to reconstruct a year of records in the two months after close is where the expensive mistakes happen.

Use accounting software that Japanese accountants recognise. The mainstream cloud options here handle consumption tax, the invoice system, and payroll, and your accountant can work in the same file. A foreign accounting package your 税理士 cannot open costs you money every month in translation.

Keep receipts and invoices properly. Retention requirements are measured in years, and the electronic bookkeeping rules have specific expectations about how digital records are stored. Deciding this at the start costs nothing. Fixing it retroactively is genuinely painful.

Everything above is the shape of it. The specific rates, thresholds, and deadlines change, sometimes annually, so confirm the current numbers with your accountant rather than with any article, including this one.