I need to calculate the total taxes from the total price to pay including the taxes, the tax rate is 19% so the correct calculation is for example
total to pay = 1000 the taxes must be 160
Why? Because 840 + 19% gives you the total price to pay = 1000 so you know the taxes of 1000 including taxes are not 190 with 19% rate but 160.
To calculate it with autofill the input I am using javascript like this to autofill many inputs
totaltaxes.value = parseInt((parseFloat(totaltopay.value)*19)/100);}
The problem is that I keep getting 190 as result of the 19% taxes and it must be 160.
Anyone have a formula to do this or idea how to calculate it? It is the 19% of the total price to pay including the taxes in the total price
This will give you the total tax :
parseInt(totaltopay.value)*0.19/1.19
This is more of a math problem than a javascript problem.
But, here's the solution anyway:
Your totaltopay value includes the tax, hence it is 1+(tax_percentage/100) times more than the amount to be paid.
You need to be doing parseInt(totaltopay.value/1.19) to get the amount to be paid.
Thus, the tax amount would be
(totaltopay.value - (totaltopay.value/1.19) = (totaltopay.value*0.19/1.19)
That is, totaltaxes.value = parseInt((parseFloat(totaltopay.value)*19)/119);