Tax, GST & Invoicing
6 tools in this category. Every one runs privately in your browser, with no account and no cost.
GST / VAT Calculator
Add tax to a net price or work backwards out of a tax-inclusive one — the reverse calculation people get wrong most often.
Sales Tax Calculator
Combine state, county and city rates into one total, and apply it across a multi-item order.
Withholding Tax (TDS) Calculator
Work out what gets withheld from a payment, what the supplier actually receives, and what to invoice if the net has to be a specific figure.
Late Payment Interest Calculator
What an overdue invoice has actually cost you — interest by the day, plus any fixed compensation you are entitled to charge.
FX Gain & Loss Calculator
The rate moved between raising the invoice and being paid. Work out what that movement — and your bank’s spread — actually cost.
Freelance Rate Calculator
Start from what you need to earn and work back to the rate — accounting for the large share of your week that nobody pays for.