Backing Out Sales Tax from Gross Total - Auditor Question

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SUMMARY

The formula to back out sales tax from a gross total is to divide the gross sales amount by (1 + sales tax rate). In this discussion, the gross sales amount of $50,859.18 includes a sales tax rate of 12.25%. The calculation is performed as follows: $50,859.18 / 1.1225 = $45,308.85, which represents the net sales amount. The sales tax amount can then be verified by multiplying the net sales by the sales tax rate, resulting in $5,550.33, confirming the original gross total.

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does anyone know the formula to back out sales tax from a gross total - I am an auditor and I need to back out sales tax ie:
gross sales 50,859.18 - this total includes sales tax at 12.25% - i need the formula to back out the sales tax form the gross sales - ANy one know??
 
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Simply divide by (1+sales tax), or in percentages (100+sales tax%)/100

So 50,859.18 / ((100+12.25)/100) = 50,859.18 / 1.1225 = 45308.85
45308.85 * 0.1225 = 5.550.33
45308.85 + 5.550.33 = 50859.18
 

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