Vantaa Tax, day 0 of 30

Vantaa Tax, an existing client that builds sales tax and VAT compliance software for SaaS companies, agreed to have its AI record fixed in public for 30 days, at no charge.

We asked ten buyer questions in its category, in the company's own words, on ChatGPT, Claude, Perplexity, Google AI Overviews and Google AI Mode, three runs each: 150 planned observations under our published method, v1.1. 111 answers came back complete. 39 Google answers did not, and each is excluded from both sides of every count, with its reason on this page.

Day 0 measures the full category question set on five engines. Our earlier case study tracked a fixed 10-question benchmark on the engines in our method at the time, so the two figures are not comparable.

No valid answer names Vantaa Tax yet. The brands the answers name most are Avalara, Anrok and TaxJar. That is the starting line this run works from.

The company's own source for this run is its Instagram profile, instagram.com/vantaa_tax: an answer that cites it counts as citing a source the company owns. The company's website is not yet on file, so no website counts at day 0. Website fixes start once it is.

For 30 days we work on the record in public, and each weekday's change goes here with its link. On day 30 we ask the same ten questions on the same five engines, three runs, and publish the before and after for all three rates, each with its receipts.