[Complete Guide] When Is Tax Filing? 2026 Japan Dates & Calendar

Disclaimer: This article is for general information purposes only and does not constitute tax or legal advice. Please consult a qualified tax professional for your specific situation. Information is current as of January 2026.

Disclosure: This article is published on the Denpyo blog. Denpyo provides receipt management and expense tracking services.

Summary: 2026 Tax Filing Dates at a Glance

Let's start with the key dates. Here are the filing deadlines for tax returns filed in 2026 (for 2025 income):

Note: Since March 15 falls on a Sunday in 2026, the deadline is extended to the next business day, March 16 (Monday).

Source: Income Tax Act Article 120

Introduction

"When does tax filing start?" "What happens if I miss the deadline?"

Every year as tax season approaches, these questions become increasingly common.

This article provides a comprehensive guide to all deadlines and schedules for 2026 tax filing in Japan.

What You'll Learn

• Exact dates and deadlines for 2026 tax filing
• Deadlines for income tax, consumption tax, and gift tax
• When e-Tax opens and the benefits of filing early
• Penalties for late filing
• A preparation calendar from today until tax day

1. 2026 Tax Filing Periods by Type

1.1 Income Tax Filing

Applies to: Income earned from January 1 to December 31, 2025

Source: NTA Tax Filing Guide

1.2 Consumption Tax Filing

This applies to taxable businesses (including those registered under the Invoice System).

Source: Consumption Tax Act Article 45

1.3 Gift Tax Filing

This applies if you received gifts of property during 2025.

2. e-Tax Opens in January!

2.1 e-Tax Start Date

Here's something many people don't know: you can create and submit tax returns via e-Tax before the official filing period begins.

The NTA's online "Tax Return Preparation Corner" also becomes available around the same time.

Source: e-Tax Official Website

2.2 Benefits of Filing Early

You can submit your tax return any time before the deadline. Here are the benefits of filing early:

3. Preparation Schedule [Calendar]

We've created a preparation calendar to help you navigate tax season smoothly.

3.1 Now Through Mid-January

Period: January 2026 - January 15, 2026

What to Do:

• Review your 2025 income
• Organize expenses and receipts
• Obtain withholding slips (from employers by end of January)
• Verify deduction certificates:
  • Life insurance premium certificates
  • Earthquake insurance certificates
  • iDeCo & Small Business Mutual Aid certificates
  • Furusato Nozei (hometown tax) donation receipts
• Organize medical receipts (if claiming medical expense deduction)
• Verify My Number Card (for e-Tax users)

3.2 Mid-January to Mid-February

Period: January 16 - February 15, 2026

What to Do:

• Confirm you've received withholding slips
• Prepare for e-Tax:
  • Test My Number Card reader
  • Verify user identification number (obtain if first time)
• Create draft of tax return
• Identify questions (consult tax office if needed)
• Prepare financial statements (for Blue Form filers)

3.3 February 16 to March 1

Period: Filing period opens - 2 weeks before deadline

What to Do:

• Submit tax return (via e-Tax, mail, or in person)
• Choose payment method:
  • Register for direct debit
  • Set up credit card payment
  • Generate QR code for convenience store payment
• Keep copies of submitted documents

3.4 March 1 to March 16

Period: Final countdown

What to Do:

• File immediately if you haven't yet
• Pay taxes (by March 16)
• Verify account balance (if using direct debit)

4. What Happens If You're Late? [Penalties]

4.1 Failure-to-File Penalty

If you fail to file by the deadline, a failure-to-file penalty (mushinkoku kasanzei) is imposed.

Example: For a tax amount of ¥1,000,000:

• ¥500,000 × 15% = ¥75,000
• ¥500,000 × 20% = ¥100,000
• Total: ¥175,000 in penalties

Note: If you voluntarily file within 1 month after the deadline and meet certain conditions, the penalty may be reduced to 5%.

Source: National Tax General Act Article 66

4.2 Delinquency Tax

If you pay late, a delinquency tax (entaizei) is charged.

Source: NTA "About Delinquency Tax"

4.3 Blue Form Special Deduction Reduction

If Blue Form (aoiro shinkoku) filers submit after the deadline, their special deduction is significantly reduced.

When the deduction drops from ¥650,000 to ¥100,000, you lose up to ¥550,000 in deductions. At a 20% tax rate, that's about ¥110,000 in extra taxes.

4.4 Heavy Additional Tax

In cases of willful tax evasion, a heavier heavy additional tax (jukasanzei) is imposed.

5. What to Do If You Can't Make It

5.1 Cases Where Extensions May Be Granted

Extensions may be granted in the following situations:

5.2 Tips for Late Filing

Even if you miss the deadline, it's crucial to file as soon as possible.

• Filing within 1 month may reduce the failure-to-file penalty
• Delinquency tax accrues daily, so earlier is better
• Voluntary filing before being contacted results in lighter penalties

6. Blue Form Approval Application Deadline

If you want to start using Blue Form filing from 2026, you must apply in advance.

Example: To use Blue Form for 2026 income:

→ Submit the "Blue Form Approval Application" by March 16 (Mon), 2026

Source: NTA "Blue Form Approval Application"

7. 2026 Tax Filing Calendar

8. Frequently Asked Questions (FAQ)

Q1: When Can I File for a Refund?

A: You can file starting January 1, 2026. You don't need to wait for the official filing period (Feb 16-). The earlier you file, the sooner you'll receive your refund.

Q2: What If March 15 Falls on a Weekend?

A: The deadline moves to the next business day. Since March 15, 2026 falls on a Sunday, the deadline is March 16 (Monday).

Q3: Does the Exact Time of e-Tax Submission Matter?

A: As long as transmission completes by 23:59:59 on the deadline, you're fine. However, avoid last-minute filing as system congestion may cause delays.

Q4: Is the Postmark Date Valid for Mail Submissions?

A: Yes, the postmark date counts. If your envelope is postmarked March 16, it's considered on time.

Q5: What Are Tax Office Hours for In-Person Filing?

A: During tax season, many tax offices extend their hours. Normal hours are 8:30-17:00, but during the filing period, some offices open on weekends or extend hours. Check with your local tax office.

Summary

Let's review the key dates for 2026 tax filing.

Prepare early, file early, and complete your tax return stress-free.

References & Sources

1. NTA Tax Filing Guide
2. Income Tax Act Article 120
3. Consumption Tax Act Article 45
4. National Tax General Act Article 66
5. e-Tax Official Website