QSBSCalc is operated by Desymphony EOOD (Sofia, Bulgaria). Reach us at one of the addresses below.
Last updated: May 11, 2026
Spotted a citation that no longer resolves, a state-conformity rule we have wrong, or a worked example that doesn't reproduce to the cent? Email editorial@qsbscalc.com. Include the URL, the specific claim, and a primary source if you have one. We acknowledge corrections within 5 business days.
For GDPR / CCPA data requests, privacy concerns, or to opt out of analytics: privacy@qsbscalc.com.
We're recruiting CPAs and Enrolled Agents with §1202 specialty — and ideally startup-equity-attorney cross-credit — for E-E-A-T attribution across the QSBSCalc pillar pages. Pool is shared across our broader CPA-bundle cluster. If you have §1202 depth and would like to be the named reviewer on the site, write to reviewers@qsbscalc.com.
We do not provide individual tax advice via email. Questions about your specific facts ("would my $4M exit qualify?") belong with a credentialed advisor licensed in your jurisdiction.