๐Ÿ“ˆ QuantCurb
๐Ÿ“… Updated February 2026โ€ขโฑ๏ธ 9 min readโ€ข๐Ÿงพ Business Taxes

GST Calculator Guide 2025: Inclusive vs Exclusive Pricing Made Simple

If you invoice clients or sell products, GST math needs to be correct. This guide explains inclusive vs exclusive GST and how to split pricing in seconds.

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Use our GST calculator for clean invoices and tax compliance.

GST basics

GST (Goods and Services Tax) is a consumption tax applied to goods and services. Businesses collect GST on sales and remit it to the government.

Inclusive vs exclusive GST

Exclusive means GST is added on top of the base price. Inclusive means the price already includes GST and you need to split it out.

GST formulas

GST Amount = Price ร— GST Rate

Base Price (Inclusive) = Price รท (1 + GST Rate)

Common GST mistakes

  • โ€ข Forgetting to label invoices as inclusive or exclusive.
  • โ€ข Using the wrong GST rate for the product category.
  • โ€ข Rounding errors on high-volume invoices.

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Anand Godar

Financial engineer and founder of QuantCurb. Former fintech data scientist building institutional-grade calculators for everyday wealth decisions.

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