GST Calculator: Exclusive & Inclusive Tax Breakdown
Calculate GST liability, net amounts, and total price with our free client-side Goods and Services Tax calculator.
How to Calculate
Enter your base amount or gross invoice total, choose whether your price is GST exclusive or inclusive, and select your applicable tax slab.
Formula Reference
Exclusive: GST = (Base * Rate) / 100 | Inclusive: GST = Total - (Total / (1 + Rate / 100))
For GST exclusive transactions, the tax percentage is added on top of the base cost. For GST inclusive transactions, the base price is derived by dividing total amount by 1 plus the tax rate.
Practical Example
Example: A base invoice of $1,000 at 18% GST results in $180 tax, totaling $1,180. If $1,180 is GST inclusive at 18%, base cost is $1,000 and GST is $180.
Frequently Asked Questions
How does this GST calculator determine inclusive tax?
For inclusive calculations, the formula Total - (Total / (1 + Rate / 100)) removes the tax embedded in the gross figure without over-taxing the net base.