Getting started with tax calculation
This is cheap to get right at the start and expensive to retrofit. A short on-ramp to tax calculation for teams who have not touched it before.
In e-commerce every friction point has a price attached, and the arithmetic is unusually easy to check. The teams that stay on top of it are the ones who put it on a calendar rather than a wish list.
Why this earns attention
Rules differ by destination and change without warning. None of that requires a large budget, only a decision and someone to own it. Check it against what you would want a competitor's site to get wrong.
Your first week
- Find out what is already in place
- Getting it wrong is a compliance problem, not just an accounting one
- Change one thing and measure it
Automate it rather than maintaining tables by hand. The cost of getting this wrong is rarely visible on the day it happens. The failure mode is not doing it wrong, it is doing it once and assuming it stays done.
In practice
Small percentage changes matter here because they apply to every order, every month. Three things worth confirming about tax calculation before you move on:
- Someone can say what the current setup is without going to look
- Getting it wrong is a compliance problem, not just an accounting one — and you know whether that is true here
- There is a way to tell whether the last change to this helped
None of this needs a rewrite. Most of it is a morning's work once someone decides to do it.