Japan Tax Calculator Support
Calculate Japanese consumption tax from tax-included or tax-excluded prices at 10% or 8%, and keep history and grouped calculations on your device. The app interface is currently in Japanese only.
Tax-included and tax-excluded calculations
On the calculator screen, choose tax-included or tax-excluded input and enter an amount. Select a 10% or 8% rate. Tax rounding can be set to round down, round half up, or round up.
Tap the displayed amount to edit it. You can copy or share the result.
Grouped calculations and rounding
Add an item name, unit price, quantity, and rate to a grouped calculation. The app totals items for each tax rate and rounds once for each rate. To compare the result with a receipt, use the same input basis and rounding method.
History, CSV, and backups
Calculations appear in History after you save them. From a history record, you can add a note, mark it as a favorite, reuse it, or delete it. Export history as CSV from the History screen. Create or restore a backup from Settings.
Restoring a backup replaces the current history and grouped calculation with the backup contents. CSV and backup files are not encrypted. Choose a destination you trust.
Delete saved data
Delete one history record or clear all history from the History screen. To delete all app data on the device, clear Japan Tax Calculator's storage in Android settings or uninstall the app. Delete exported files at their destination.
Calculation information
The app's calculation method and instructions are available under Calculation and Help in Settings. The app does not calculate tax filing or payment amounts. Check guidance from Japan's National Tax Agency for current tax rules and rounding practices.
Before contacting support
If you still need help, include the app version, Android version, the action you took, and the message shown. Do not send calculation history or backup files.
Contact
For questions about Japan Tax Calculator, please contact CAEN Inc. by email.