副業・スキマバイト確定申告｜FinFin

The 2025 tax return app for part-time workers, officially approved by Timee, allows you to file your tax return using only your smartphone. Find out for free if you need to file a tax return!

Official Timee-approved 2025 tax return app
"Tax Return for Part-time Jobs Powered by FinFin" is an app that allows you to file your tax return using just your smartphone.
It supports first-time tax return filers working side jobs, part-time jobs, or one-off part-time jobs.

・Easily scan withholding slips
・See at a glance whether you need to file a tax return
・Easily link medical expense deductions with My Number Portal
・Easily import donation deduction certificates from the hometown tax donation website
・Easily file your tax return by answering questions
・Goal management that makes your dreams come true (total salary/annual income barrier)

■Recommended for
・Those using part-time job apps (such as Timee)
・Spot workers
・Those working one-off part-time jobs/side jobs
・Those unsure whether they need to file a tax return
・Those who want to file their tax return using their smartphone without visiting the tax office
・Those looking for a simple and easy accounting/filing app
・Those who want to consolidate deductions, such as medical expenses and hometown tax donations
・Those who find filing a tax return difficult (the app's question guide makes it easy)

■How to Use
[Annual Income Barrier/Goal Management]
Register your withholding slips in the app and easily manage your income. You can easily see your "annual income thresholds" at a glance, such as ¥200,000 in side hustle income, ¥1,030,000 in dependent support, and ¥1,300,000 in social insurance.
This app is also ideal for those looking to use their side hustle income to realize their dreams and goals.
[Tax Return]
Create your tax return by simply answering questions.
Submit your tax return using your smartphone, without having to visit the tax office.

■Note
"Tax Return for Part-time Jobs" is part of the FinFin (finfin) series of apps.
Please be sure to read the "Terms of Use" and "Privacy Policy" before using the app.
If you have a FinFin account, you can also use other FinFin series apps with the same account.
Terms of Use: https://www.finfin.jp/terms/final-tax-return-for-sjsw-terms01.html
Privacy Policy: https://www.finfin.jp/privacy/