When does Japan's fiscal year start?

1 April. The budget that funds it is drafted the previous summer, approved by Cabinet in late December, and passed by the Diet before 31 March. This means the decisions shaping any given fiscal year are effectively made nine to twelve months before it begins.

What is the gaisan yokyu and why does it matter?

The gaisan yokyu (概算要求) is the concept budget request each ministry submits to the Ministry of Finance for the following fiscal year, with a deadline at the end of August. It is the point at which a ministry's funding priorities are committed to paper. If you want a programme funded, the argument has to be made to the ministry well before that deadline, not after.

When does the Japanese Diet sit?

The ordinary session (常会) convenes in January and runs 150 days, to around late June. It handles the budget first, then legislation. An extraordinary session (臨時会) is usually convened in the autumn. A special session (特別会) follows a general election to designate the Prime Minister. Bills not passed within a session generally lapse unless a committee resolves to carry them over.

Why does the summer personnel rotation matter for engagement?

Japanese ministries conduct their main personnel reshuffle in the summer, typically around July. Bureau directors, division directors and desk officers move, often to unrelated posts. A relationship built over eighteen months can reset in a single announcement. Engagement started in June frequently has to be restarted in August with a new counterpart.

How does tax reform work on a different track from the budget?

Tax changes run through the ruling party's tax commission rather than the ordinary budget process. That body works through the autumn and publishes the tax reform outline (税制改正大綱) in mid-December, which then becomes legislation in the ordinary session. A tax ask made in January is a year late, because the outline is already published.

The Japan Policy Calendar: When to Engage, and Why February Is Usually Too Late

A foreign company decides in January that a regulatory change matters to it. It briefs an agency, arranges introductions, and opens conversations with the relevant ministry in February.

It is roughly six months too late for the budget cycle, and possibly eighteen months too late for the rule itself.

This is the single most common and most expensive mistake foreign organisations make in Japanese public affairs, and it is not a mistake about substance. The arguments are usually sound. The problem is that Japanese policymaking runs on a fixed annual rhythm, with several tracks moving in parallel, and each has a point past which that year’s outcome is settled. Arrive after it and the answer is not no. The answer is next year.

This is the calendar. It is the companion to our market-entry regulatory checklist, which maps the institutions. This one maps the timing.

The master clock: the fiscal year

Everything else hangs off this. Japan’s fiscal year runs 1 April to 31 March, and the budget that funds it is built the previous year:

The Cabinet sets the overall frame in June with the Basic Policy, the document known as the honebuto hoshin (骨太方針). Ministries then translate that frame into money. By the end of August each ministry must submit its concept request (概算要求, gaisan yokyu) to the Ministry of Finance, setting out what it wants funded next year. The MOF spends the autumn cutting those requests down. The Cabinet approves the budget draft in late December. The Diet then deliberates it from January and must pass it before 31 March, when the new year begins.

Read that sequence backwards and the implication is stark. A programme that starts spending in April 2028 was argued for inside a ministry in spring 2027, committed to paper in August 2027, and fought over with the MOF in autumn 2027. By the time it appears in a published budget in December, it is a fact, not a proposal.

The calendar, month by month

Five tracks run in parallel. This is what is happening in each, and what it means for you.

Month	Budget	Diet	Councils and rules	What it means for you
January	Diet receives the budget	Ordinary session convenes	Councils resume	Watch, do not launch. This year is set.
February	Budget in committee	Budget deliberation dominates	Interim work	Officials are consumed by budget defence. Poor time for new asks.
March	Budget must pass by the 31st	Budget passage, then bills	Reports finalised	Fiscal year closing. Access is thin.
April	New fiscal year begins	Bill deliberation	New council cycles convene	Reorganisations take effect. Re-verify contacts and URLs.
May	Execution begins	Bills continue	Councils in session	Good window. Next year’s thinking is starting.
June	Honebuto sets next year’s frame	Ordinary session ends	Interim reports published	Critical. Your issue either is or is not in the frame.
July	Ministries draft requests	Recess	Councils pause	Summer personnel rotation. Counterparts change.
August	Concept requests due end of month	Recess	Quiet	The hard deadline. After this, next year’s funding is committed.
September	MOF review begins	Extraordinary session may convene	Councils resume	Tax commission work begins.
October	MOF cutting requests	Session in progress	Active deliberation	Argue against cuts, not for new items.
November	Final MOF negotiation	Bills progress	Reports drafted	Last realistic influence on next year’s money.
December	Cabinet approves budget draft	Session ends	Tax outline published mid-month	Both budget and tax are now settled for the year.

The five tracks, and where each one closes

The budget closes at the end of August for practical purposes. After the concept request is filed, a ministry is defending a number rather than choosing one.

The Diet session matters because Japan does not carry legislation over by default. A bill not passed within a session generally lapses unless a committee formally resolves to continue it. This creates real pressure at session end, and it means the legislative window for a given bill is finite and visible in advance.

Advisory councils run six to eighteen months ahead of legislation. Their interim reports (中間とりまとめ) often land in summer and their final reports in winter, feeding the next session’s bills. This is the earliest and most useful track, and the one most organisations do not watch.

Tax reform runs on its own track, and this catches people out. Tax changes are shaped by the ruling party’s tax commission, not primarily by the ministries, and that body does its work from autumn to mid-December, when the tax reform outline (税制改正大綱) is published. A tax ask raised in January is a full year late.

Personnel is the track nobody puts on a calendar. Ministries reshuffle in summer, typically July. Bureau directors, division directors and desk officers move, frequently to unrelated portfolios. A relationship built patiently over eighteen months can reset in one announcement. Engagement opened in June often has to be reopened in August with someone new.

The step foreign organisations miss entirely

Before a Cabinet bill reaches the Diet, it usually passes through the ruling party’s own policy machinery: its policy research council and the relevant sectional committee, in a pre-screening process. In practice a bill that has not cleared that internal review does not get submitted.

This matters because it means there is a decision point that is not a ministry and not the Diet. Foreign organisations tend to map the bureaucracy carefully, engage the Diet occasionally, and miss the party process completely, which is frequently where a bill’s contours are actually settled.

What good timing looks like

Working backwards from an outcome you want in fiscal year N:

N minus 24 months. The advisory council covering your issue begins deliberating. This is when the substance is genuinely open.
N minus 18 months. Council interim report. Positions are forming and can still be shifted with evidence.
N minus 12 months, spring. Ministries develop budget priorities internally. Your argument needs to be inside the building now.
N minus 12 months, June. Honebuto sets the frame. Being outside it is difficult to recover from.
N minus 12 months, August. Concept requests filed. The funding question is now committed.
N minus 12 months, autumn. Tax commission, if your issue is fiscal. MOF negotiation, if it is budgetary.
N minus 12 months, December. Budget draft and tax outline published. The year is set.
N minus 9 months, January to March. Diet deliberation. Influence here is political and narrow.

The practical rule: twelve to eighteen months ahead of the outcome you want, which is consistently longer than newly arrived teams expect and longer than most annual planning cycles accommodate.

Three timing mistakes worth avoiding

Planning against your own fiscal year. If your global planning cycle runs January to December, it is out of phase with the Japanese government by one quarter at both ends. Budget your Japan engagement against the Japanese year.

Treating the summer as quiet. July and August look like recess from outside. Inside a ministry they are the busiest and most consequential weeks of the year, because that is when next year’s requests are written. It is the worst time to be absent and a difficult time to get meetings, which is why the groundwork has to be laid in May and June.

Reacting to the news. By the time a policy change is reported, it has been through a council, a budget request, and often a party review. The reporting is the end of the process. Anything you can do at that point is damage limitation.

Where to watch

The tracks above are all public. Council agendas and minutes, concept requests, the honebuto, the tax outline, Diet calendars and committee schedules are published. The difficulty is not access but coverage: they sit across dozens of ministry sites in inconsistent formats with no central index, which is the problem we cover in real-time policy monitoring in Japan.

If you want your own issues mapped against this calendar, including which councils to watch and when your realistic windows fall, get in touch.

Further reading: the market-entry regulatory checklist covers which institutions apply to you, and how Japanese policymaking works sets out the path from advisory council to statute.