Hello,

You are calculating exclusively.

The tax is calculated as following

Product Price 100 and Tax 10%
Inclusive tax method: (100 * 10) / (100 + 10) = 9.09
Price 90.91 and Tax amount: 9.09 = 100 (total price with tax) 


Exclusive tax method: (100 * 10) / 100 = 10
Price 100 and Tax amount: 10 = 110 (total price with tax)

Thank you

Try out $3.79 item on demo pos.

Calculating using exclusive formula, with tax 6.625 totals $4.041, but as per my experience POS is outputting $4.017

Correct formula $3.79 x $6.625 = $25.10875 $25.10875/100 = $0.2510875 $3.79 + $0.2510875 = $4.0410875

The code is rounding down to integer or something because $4.017 means only 6%. Tried multiple items.

Hello,

The tax will be rounded to your decimal points. There is only 4 max decimal points for precision.

Simple POS are using the above mentioned from start and there is no plan to change. If you need, you can modify the exlusiveTax & inclusiveTax method of app/libraries/Tec.php for php while themes/default/assets/dev/js/custom.js for javascript.

Thank you