[Industry's Lowest Price*! Start Using the Free Tax Return App]
"Smartphone Accounting FinFin" is an accounting app that lets you handle everything from daily accounting to filing your tax return with just one smartphone.
It's also suitable for freelancers, sole proprietors, and side hustlers!

*According to our own research (as of January 2026), it's the best smartphone tax return app.

[What's Great About Smartphone Accounting!]
◆New feature "Easy Deduction" now available!
Just upload your documents and your deduction details will be automatically updated!
Leave all the calculations to the app!
(Supports medical expense deductions, self-medication tax systems, and donation deductions)

◆Choose from 3 modes (Business Mode, Easy Side Hustle Mode, Deductions Only Mode)
"I don't know which mode I should use..."
For those of you who find yourself in this situation,
Just answer the questions in the app and we'll recommend the mode that's right for you!
Choose the mode that suits you best for a smooth tax return.

◆Of course, you can also file electronically.
Answer true/false questions to create your tax return,
and submit your documents from home.
(Supports both blue and white tax returns.)

◆No need to enter daily accounting data.
Account integration with 99% of financial institutions is supported.
Automatically journalize credit card and bank transactions.

◆Easy journalization with just a photo of your receipts.
Continue with tedious accounting tasks in your spare time.

◆My Number Portal integration.
Automatically update the information required for your tax return.
Import withholding slips and medical expense deductions.

[More features!]
・View sales and expenses in graphs on the home screen!
・Register journal entries and record daily transactions on the journal entry screen!
・Automatic journalization with just a photo of receipts, invoices, and bills!
・Link your bank account and credit card statements on the account screen for automatic journalization!
・You can also link electronic money!
・Import withholding slips and medical expense deductions through My Number Portal integration!
・Import donation deduction certificates issued on the hometown tax donation website!
・Easily create your tax return by answering true/false questions!
・Submit your return within the app! (e-Tax integration)

[FinFin Smartphone Accounting is recommended for the following people!] 】
・People who are anxious about filing their tax return for the first time
・People who have filed their tax return before but still feel a bit unsure
・People who want to easily complete their tax return by accounting for daily transactions without spending a lot of time
・People who want to easily enter daily transactions
・People who want to automatically import bank account and credit card transactions
・People who want to continue accounting anytime, anywhere in their spare time
・People who want to easily manage expense documents with receipt capture and receipt scanning functions
・People who want to easily access information required for deductions, such as medical expenses and hometown tax payments
・Freelancers and sole proprietors
・People working part-time
・Employees who forgot to file their year-end tax adjustments
・People who want an accounting and filing app that can be completed entirely on their smartphone
・People who are confused by the various apps available and are looking for a reliable app

【You can create documents like these! 】
・Blue Return Financial Statement
・Income and Expense Statement
・Income Tax Return
・Consumption Tax Return

[Click here for the official FinFin Smartphone Accounting website]
https://www.finfin.jp/sp-kaikei/kaikei.html

[Contact Information]
If you have any questions, please feel free to contact us.
https://faq.finfin.jp/hc/ja/requests/new

[Privacy Policy]
https://www.finfin.jp/privacy/

[Terms of Use]
https://www.finfin.jp/terms/terms01.html