The 年末調整計算 app is designed for iPhone users who need to complete year-end tax adjustments efficiently. This productivity tool focuses on helping users fill out the necessary forms such as the insurance premium deduction and basic deduction申告書. It offers a user-friendly interface where users can tap on the blue fields to enter data, with input fields turning green during entry. Once the required data is inputted, the app displays the results in the yellow fields, simplifying the calculation process without the need for electronic filing.

This app is particularly useful for small to medium-sized enterprises, allowing for the saving of data with a unique four-digit identifier. Users can reference previous calculations easily, making it a practical choice for managing employee data. While it may require users to compare the app with physical forms for clarity, it provides a straightforward solution for manual year-end adjustment calculations.