Press and hold the key for two seconds until "SET" is displayed. Press the [TAX+] key. Enter the numerical tax rate. Press the [%] key to finalize the setting. Specialized Models
key for about two seconds until "SET" (or "0") appears on the display Enter Rate : Type in your tax percentage (e.g., press Amazon.com : Press the [%] (Rate Set) key again to save it Method 2: If "Set" is above the [%] key
The instructions differ slightly between these two categories. Find your model below.
For many common desktop and portable Casio models (e.g., MS, SL, or HL series), the process follows these steps: Clear the Memory : Press the
This is the most common scenario for cashiers and small business owners. Follow these steps precisely.
If you have a total of $107.50 and want to find the original price before tax: Type Press [TAX-] The screen will show the Pre-Tax Price ($100).
Some models require an extra step to tell the calculator you are specifically setting the Clear everything : Press the Enter Setup : Press and hold the key for about two seconds until "SET" appears Select Tax : Press the key. The screen should now show "TAX" and "%" Enter Rate : Type in your tax percentage (e.g., : Press the key to finalize How to use and verify your tax rate To Check the Rate , then press
| Step | Action | Key(s) to Press | Display / Result | |------|--------|----------------|------------------| | 1 | Turn on the calculator or clear any existing entries. | AC or CA | Display shows 0 . | | 2 | Enter the desired tax rate (e.g., 10%). | 1 0 | Display shows 10 . | | 3 | Press the key sequence. | RATE (or TAX SET ) then TAX+ | Confirm – some models beep or show TAX % . | | 4 | Verify the new rate. | Press RATE then TAX- | Display shows the newly stored rate. | | 5 | Exit setup mode. | AC or CA | Returns to calculation mode. |