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Side Job Expense & Tax Guide for Japan Employee...

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Side Job Expense & Tax Guide for Japan Employees 2026

Manage side income in Japan without your employer finding out: expense tracking, blue return options, residence tax routing and the ¥200,000 filing threshold.

January 1, 2026
|Source:National Tax Agency

For general reference only. Consult a tax professional for individual advice. Last verified: January 1, 2026 · Source: 国税庁

This is an expense management guide for those working full-time while having a side job. Properly claiming expenses provides tax benefits, but also understand key points to maintain privacy from your employer.

Tax Filing Threshold

For salary earners, if side income exceeds ¥200,000/year, tax filing is required. However, residence tax filing is required even under ¥200,000.

How to Keep Your Side Job Private

Choose "Direct Payment" for Residence TaxImportant

By selecting "Self Payment" in the residence tax section of your tax return, your side income tax will not be notified to your employer.

Check Company Regulations

Check if side jobs are prohibited. If permission is required, consider applying formally.

Avoid Competing with Main Job

Side jobs competing with your main job may violate regulations. Also avoid using main job information.

Understand the ¥200,000 RuleImportant

Even if side income is under ¥200,000/year, residence tax filing is required. File with your local municipality even if income tax filing is not needed.

Deductible Side Job Expenses

Computer & Equipment

Deductible

  • +Computer/tablet (business dedicated)
  • +Monitor and keyboard
  • +Camera and microphone (for streaming/recording)
  • +Software and subscriptions

Not Deductible

  • -Computer shared with personal use (full amount)
  • -Gaming/entertainment equipment

Tip: Prorate by business use if shared. Under ¥100k is an immediate expense; blue-return filers can expense items under ¥400k bought from April 2026.

Workspace

Deductible

  • +Rent (business use area)
  • +Electricity (business portion)
  • +Internet (business portion)
  • +Coworking space fees

Not Deductible

  • -Mortgage principal
  • -Personal portion of utilities

Tip: If working from home, prorate by floor area. Typically 20-40% is common.

Communication

Deductible

  • +Mobile phone charges (business portion)
  • +Video conferencing tools (Zoom, etc.)
  • +Cloud storage
  • +Domain and hosting fees

Not Deductible

  • -Personal call charges
  • -Entertainment subscriptions

Tip: If shared between business and personal, prorate by call logs or usage time. Typically 30-50%.

Learning & Skills

Deductible

  • +Business-related online courses
  • +Professional and technical books
  • +Business-related certification costs
  • +Seminar and conference fees

Not Deductible

  • -Hobby classes
  • -Unrelated certifications
  • -Entertainment books

Tip: Relevance to your side job is key. Fully deductible if you can explain the business connection.

Tax Filing Preparation Checklist

1

Organize Your Income

  • Get annual payment statements from each platform
  • Check bank account deposit records
  • Collect withholding tax slips (if any)
2

Calculate Your Expenses

  • Organize receipts by expense category
  • Record calculation basis for prorated expenses
  • Also use credit card statements
3

Prepare Tax Return

  • Use the NTA tax return preparation site
  • Combine salary income and business (miscellaneous) income
  • Select "Self Payment" for residence tax
4

File and Pay

  • Online filing via e-Tax is recommended
  • Deadline is March 15 (income tax)
  • Pay by bank transfer or credit card before deadline

Don't Forget Residence Tax Selection

If you don't select "Self Payment" in the residence tax section of your tax return, your employer will be notified.

Frequently Asked Questions

The most common cause is residence tax. If you leave the payment method as "Special Collection (payroll deduction)" when filing, your employer receives notification of residence tax including side income, which payroll staff may notice. By selecting "Direct Payment (self payment)", you pay side income tax directly and it is not notified to your employer.
Income tax filing is not required, but residence tax filing is. If you neglect residence tax filing, you may face additional taxes later. Either file directly with your municipality, or file income tax return (which automatically files residence tax). Also, if you want medical expense or furusato deductions, income tax filing is required even under ¥200,000.
Yes, if you work on your side job at home, you can claim part of your rent as an expense. Calculate by floor area. For example, if using 6㎡ for work in a 30㎡ room, 20% of rent can be expensed. Keep records of your calculation basis.
It depends on the scale of your side job. If you have continuous income at a certain level (roughly ¥1M+ annually), Blue Return is beneficial. You get a ¥650,000 special deduction and can carry forward losses. However, it requires double-entry bookkeeping. For small side income, White Return is fine.

Expense Checker Tool

Instantly check if an expense is deductible. Free tool that shows categories and deduction rates.

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