Built to make sales tax compliance affordable, not just automated.

Sigma Files was built on a simple premise: sales tax compliance has been priced for decades around the cost of manual review by accountants and law firms. Our AI does that review — cross-checking every registration and return against current state rules before it's filed — at a fraction of the labor cost. That's the entire reason our prices sit well below conventional CPAs and legacy compliance firms, without cutting corners on accuracy.