年末調整チェック｜控除証明書の届いた・未着と締切の管理

Kaika Labs

Contains adsIn-app purchases

About this app

This app automatically lists the deduction certificates and declaration forms you need to submit to your company for year-end tax adjustments, based on your situation, and manages whether they've been received or not, as well as your company's deadlines.

You can check if you've received your life insurance premium deduction certificate, iDeCo (small business mutual aid contribution) payment certificate, and documents for national pension, earthquake insurance, and housing loans.

You'll receive notifications 14 days, 7 days, and 1 day before the deadline. If you haven't received or have lost a deduction certificate, you'll quickly find out where to request a reissue.

This app eliminates the frustrations of "What do I need to submit for year-end tax adjustments?", "I can't find my deduction certificate postcard," and "I missed my company's deadline." It's designed for company employees and part-timers, those doing it for the first time, those who have changed jobs, and those with life insurance, iDeCo, or housing loans.

*This is not a government or tax office app (it's a private app operated by Kaika Labs). It does not calculate taxes or fill out declaration forms on your behalf.

■ What you can do
- Create a list of documents you need to submit by simply answering questions (1 minute) (life insurance, earthquake insurance, national pension, national health insurance, iDeCo, housing loan, spouse, dependents, job change)
- Manage the status of deduction certificates (those you receive): not yet received / received / searching for / requesting reissuance / handled in tax return / not needed
- Get an estimate of when they will arrive and where to request reissuance if they don't arrive or are lost (insurance company, pension agency, iDeCo, financial institution, previous company)
- Check the submission status of tax returns (those you submit to your company) and provide guidance on the four types of tax returns (who submits them, what to include)
- Show how many days are left until your company's deadline. Notifications will be sent 14 days, 7 days, and the day before the deadline, and on October 15th when postcards begin arriving.
* Take photos of the received certificates (up to 10 photos per item. Save only on your device).
* Changes for 2026 (Increase in basic deduction, minimum guaranteed amount for employment income deduction, income requirements for dependents, special deduction for specific relatives, special provisions for life insurance premium deduction).
* Copy the list for the following year and use it as is.
* Home screen widget (Number of days left until the deadline, number of unreceived items)

■ For those who:
* Are doing year-end tax adjustment for the first time and don't know what to submit.
* Want to know if deduction certificates have arrived and which ones are missing.
* Have experienced having to file a tax return because reissuance was not possible in time.
* Don't want to forget the company's deadline.

■ Please note:
* We do not calculate tax amounts or deduction amounts, or fill out tax return forms on your behalf. Please check the National Tax Agency's website for instructions on how to fill them out (a link is available in the app).
* The arrival times are estimates based on typical notifications. This may vary depending on the insurance company or financial institution.
* This app is not a government or tax agency app. It is a private app operated by Kaika Labs.

■ About Data
* Policy numbers and amounts are not entered. Lists, statuses, and notes are not sent to the developer's server (they may be included in Android's automatic backups).
* Photos are saved only on the device and are not included in automatic backups. They will not be transferred when changing devices.
* Camera and storage permissions are not used (photos are selected using Android's photo selection tool).

Advertisements are displayed. Ads can be removed with an in-app purchase (one-time purchase).

■ Official Information Sources
- National Tax Agency "Page for Understanding Year-End Adjustments (for 2026)" https://www.nta.go.jp/users/gensen/nencho/index.htm
- National Tax Agency "How to File Year-End Adjustments for 2026" https://www.nta.go.jp/users/gensen/nencho/index/shikata.htm
- National Tax Agency "Declaration of Insurance Premium Deductions for Salaried Employees" https://www.nta.go.jp/taxes/tetsuzuki/shinsei/annai/gensen/annai/1648_05.htm
- National Tax Agency "Declaration of Changes in Dependent Deductions, etc. for Salaried Employees" https://www.nta.go.jp/taxes/tetsuzuki/shinsei/annai/gensen/annai/1648_01.htm
- National Tax Agency "Declaration of Basic Deduction, Spouse (Special) Deduction, Special Deduction for Specific Relatives, and Income Adjustment Deduction for Salaried Employees" https://www.nta.go.jp/taxes/tetsuzuki/shinsei/annai/gensen/annai/1648_73.htm
* National Tax Agency Tax Answer No. 1140 Life Insurance Premium Deduction https://www.nta.go.jp/taxes/shiraberu/taxanswer/shotoku/1140.htm
* National Tax Agency Tax Answer No. 1135 Small Business Mutual Aid Contribution Deduction (iDeCo Contributions) https://www.nta.go.jp/taxes/shiraberu/taxanswer/shotoku/1135.htm
* National Tax Agency "Frequently Asked Questions about Housing Loan Deduction (Method Using Year-End Balance Statement)" https://www.nta.go.jp/taxes/shiraberu/shinkoku/jutaku/qa.htm
* Japan Pension Service "Scheduled Mailing of Social Insurance Premium (National Pension Insurance Premium) Deduction Certificates for Fiscal Year 2026" https://www.nenkin.go.jp/oshirase/taisetu/kojin/2026/202609/0924.html
- National Pension Fund Association iDeCo Official Website "Notice Regarding Procedures" https://www.ideco-koushiki.jp/news/procedure/

What’s new

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・下の 4 つのタブ（ホーム／書類一覧／写真／お役立ち）で、見たい画面にすぐ移れます
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