Tools
Free calculators for the everyday arithmetic of running a shop. Nothing to install, and no account needed.
NIT check digit
The digit DIAN puts after a NIT, worked out from the number itself.
IVA calculator
Add tax to a price, or take it back out of one that already includes it.
Price, cost and margin
Fill in any two and the third is worked out, with margin and markup side by side.
Chained discounts
What several discounts on one price are really worth together.
WhatsApp link
A link that opens a chat with your shop, with the first message already typed.