Freelance tax calculator tools for startups

There are roughly 40-60 tax calculators currently targeting freelancers, ranging from spreadsheet templates to SaaS platforms like Wave, FreshBooks, and QuickBooks. The problem is that most are either too generic (treating all self-employed income the same) or too expensive for early-stage founders making under $100k annually. The common failure point is that these tools lack startup-specific logic—they don't account for equity compensation, contractor rates that vary monthly, business expense category optimization, or quarterly tax penalty avoidance. The real gap isn't in calculation accuracy; it's in the UX layer and decision support. Founders need guidance on what to deduct, not just what to calculate. A shipper entering this space should focus on either vertical specificity (e.g., SaaS freelancers, content creators, agency contractors) rather than horizontal coverage, or build the decision engine that tells users what they're missing—the advisory angle, not the math angle. Wave and FreshBooks own the SMB space already; you can't compete on features there. You compete by being 10x faster for one specific freelancer archetype.