GST Tools Directory
Choose a GST calculator for the amount, direction, or compliance task you need.
GST Calculators
GST tools for everyday price and invoice calculations.
GST Calculator
Add GST to a base price or remove GST from a GST-inclusive total.
Inclusive GST Calculator
Extract tax and base price from total amounts.
Exclusive GST Calculator
Add tax to base prices with precision.
Reverse GST Calculator
Calculate backwards from any total price.
GST Filing, Credit & Rebate Tools
Calculate GST credits, delayed-payment interest, filing late fees, and housing rebates.
ITC Calculator
Calculate Input Tax Credit and Net GST Payable.
GST Interest Calculator
Estimate interest on delayed GST payments (Section 50).
GST Late Fee Calculator
Compute GSTR-3B/1/9 penalties and capping.
New Housing Rebate Calculator
Estimate Canada's federal and provincial GST/HST new housing rebates.
Country GST Calculators
Use the GST rates and calculation rules for a specific country.
Canada GST/HST Calculator
Add, remove or reverse GST, HST, PST and QST for all 13 Canadian provinces.
Quebec GST/QST Calculator
Reverse or add Quebec GST 5% + QST 9.975% with parallel calculation.
Singapore GST Calculator
Add or remove Singapore's 9% GST, with the 10% service charge stack for restaurant bills.
NZ GST Calculator
Add or remove New Zealand's 15% GST using Inland Revenue's ×3÷23 method.
Australian GST Calculator
Add or remove Australia's 10% GST with the official ÷11 method for GST-inclusive totals.
GST Tools Directory FAQ
Q1.What is this tools directory?
This page lists our GST calculators in one place: the general calculator, inclusive and exclusive modes, reverse calculator, ITC calculator, interest and late fee tools. Use it to find the right tool for your task.
Q2.Which calculator should I use for a quick total?
For a quick calculation, use the GST Calculator on the home page. Choose Add GST for a base price or Remove GST for a total that already includes GST.
Q3.I have a total price including tax and need the breakdown. Which tool?
Use the Inclusive GST Calculator or the Reverse GST Calculator. Both extract the base price and tax from a total; the inclusive page is focused on that one job.
Q4.Where do I calculate late fees or interest?
Use the GST Late Fee Calculator for GSTR-3B, GSTR-1, and GSTR-9 penalties and capping. Use the GST Interest Calculator for Section 50 interest on delayed tax payment.
Q5.Are these tools free and private?
Yes. All tools run in your browser. No sign-up or server storage of your figures; calculations and history stay on your device.