You're not reading product reviews here—you're reading tax tables. But the same principle applies: look for corroboration and nuance.

When you find a rate on the Tax Foundation's map, click on your state and read the footnote. It often says something like "10% of wholesale price" or "$0.05 per milliliter." That's the kind of specificity you need.

Then go to the state's revenue department site and look for the actual statute or rule. Search for "vapor products tax" or "e-cigarette excise tax." If you can't find it, call the department's taxpayer assistance line. I've done this more than once, and the reps are usually happy to point you to the right document.

One thing that trips up many operators: the difference between tax on the wholesale price and tax on the retail price. If a state taxes at the wholesale level, you might not see a separate line on your invoice—the distributor already included it. But if you're importing directly or selling in-state, you need to know who's responsible for remitting.

Another nuance: some states tax e-liquid by volume, but they define "e-liquid" differently. Does it include zero-nicotine juice? What about prefilled pods versus bottles? These details are in the statute, not in a summary table.

So when you read a table, ask yourself:

• What's the tax base: wholesale, retail, or per milliliter?
• Who collects it: the retailer, the distributor, or both?
• Are there exemptions for small purchases or certain product types?
• When did the current rate take effect?

Once you have those answers, you can calculate your tax liability with confidence.