IGST 5% (wrong calculation?)

1

Dear all, Please help me with this

I am purchasing an item at 750 rupee from Gujarat to Kerala (so 5% IGST is Applicable) right?
As per my supplier 5% GST already included on this price (so the real price is 750 - 5% = 712.5 Rupee)
Tax Amount = 37.5

Please check the screenshot. Why it showing 35.71?
Please help

gst-calc
gst-calc1766×1450 191 KB

When enter rate = 1

gst-calcu
gst-calcu1760×1456 187 KB

2

The 5% is applicable on the pre tax rate. So you have to divide 750/1.05 which is 714.2857. Hence IGST of 750 - 714.29 = 35.71 calculated is correct.

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