The Cashbook GST Calculator is a simple way to calculate GST inclusive or GST exclusive prices.
Click GST
Calculator menu option
There are four variables in the calculator:
Price Excluding GST
GST Rate % - defaults from GST Setup
Amount of GST
Price including GST
Enter the value for a variable eg. Price including GST 121.00
Press on the Enter key to calculate other variables
Click Clear to reset
For example:
How to Calculate GST Manually, Assuming a GST Rate of 10%
To calculate GST at 10% rate: just multiple your GST exclusive amount by 0.1
$500 is GST exlusive value
$500 * 0.1 = $50 GST amount
To get GST inclusive amount multiply GST exclusive value by 1.1
$500 is GST exlusive value
$500 * 1.1 = $550 GST inclusive amount
To get GST part of GST inclusive amount you need divide GST inclusive amount by 11
$220 is GST inclusive value
$220 / 11 = $20 GST value
To get GST exclusive amount while knowing GST inclusive value you need to multiply GST inclusive price by 10 ant then divide result by 11
$220 is GST inclusive value
$220 * 10 = $2200
$2200 / 11 = $200 GST exclusive amount