The Income Tax and Resident Tax Calculation app, developed by Daisuke Tonosaki, is a free mobile application designed to simplify tax calculations for iPhone users. This app is specifically tailored for the fiscal year 2023 and offers a range of features to help users calculate their income tax, including the special reconstruction income tax, as well as their resident tax. Additionally, the app provides information on the maximum deduction limit for hometown tax donations, ensuring that users can maximize their contributions while minimizing their financial burden.

With this app, users can also simulate year-end adjustments and final tax returns, making it a valuable tool for those looking to plan and prepare for their tax obligations. The app supports various types of income, such as salary income, miscellaneous income (including profits from side jobs and cryptocurrency), and temporary income (such as winnings and refunds from horse racing and bicycle racing). It also covers a wide range of deductions, including miscellaneous loss deductions, medical expense deductions, social insurance premium deductions, and more.

Please note that while this app provides convenient calculations, it does not guarantee the accuracy of the results. It is intended for reference purposes only and should not be solely relied upon for tax-related decisions.