NEXVAANI
Financial Guides6 min readAugust 21, 2026

Complete Guide to Sales Tax and GST Calculations (Inclusive vs Exclusive)

NV
Written by NexVaani Finance Team
Executive Summary

Whether billing clients as a freelancer or reconciling e-commerce receipts, calculating inclusive vs exclusive tax rates accurately prevents costly accounting errors.

The Inclusive Tax Reverse Formula

When the gross price already includes 18% tax: Pre-Tax Amount = Total / (1 + Rate/100). Tax Amount = Total - Pre-Tax Amount.

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