GST Calculator NZ
Add or remove 15% GST on any amount, instantly.
Open tool →Free tools
Free tools for NZ tradies
Practical tools built for New Zealand plumbers, electricians, builders and every trade in between. Work out GST, prepare payment documents, explore insurance research questions, or check your pricing — all free, no sign-up needed.
Invoicing
Getting paid
Late Payment Interest Calculator NZ
Work out the interest you can charge on an overdue invoice.
Open tool →Letter of Demand Generator NZ
Generate a firm, compliant final-notice letter for an unpaid invoice.
Open tool →Construction Payment Claim & Schedule Generator
Create a CCA 2002 payment claim or payment schedule for construction work.
Open tool →Pricing & tax
Insurance
Why we built these
Most NZ trade businesses lose hours every week to admin — quoting, invoicing, working out GST, and chasing late payments. These free tools take the friction out of the jobs you do over and over. They follow the order that actually gets you paid: get the invoice right, set clear payment terms, and act fast when a payment goes overdue.
If you'd rather not chase invoices by hand at all, compare job management software — the good ones send the reminders for you.