Privacy

Last updated: 2026-05-08

The short version

The free calculator runs entirely in your browser. Your income, custody timeshare, number of children, and filing status are never transmitted to our servers. We can't see them, log them, or share them.

What runs where

• Calculator math. The §4055 formula and tax-bracket math execute as client-side JavaScript that we ship to your browser once at page load. Your answers are processed in memory on your device and discarded when you close the tab.
• Static pages. Pages like this one are static HTML served from a CDN. Loading them creates an entry in the standard web-server access log (IP, timestamp, page) that our hosting provider retains briefly for abuse prevention. We do not query that log to identify users.

What we do collect

Beyond what your browser exposes by default to any website (IP address visible to our hosting provider, your browser's user-agent string), we use Vercel Analytics for aggregate page-view counts. Vercel Analytics is privacy-friendly by design: no cookies, no cross-site tracking, no PII, and no advertising pixels. It records page-level events (which page was viewed, country of visitor) without identifying individuals.

We do not run third-party advertising trackers, fingerprinting scripts, or session-replay tools.

Cookies

The free calculator does not set cookies. The site does not currently use authentication, advertising, or session storage. If we add a paid tier later that requires accounts, we will use a session cookie strictly for keeping you logged in — and this page will be updated.

Data retention

Free-tier inputs: not retained — never received in the first place. Future paid-tier saved cases (when that feature ships) will be retained until you delete them or close your account.

California Consumer Privacy Act (CCPA / CPRA)

Because we do not collect personal information from free-tier users, most CCPA/CPRA disclosures do not apply. If we add features that collect personal information (account creation, saved cases), we will publish a CCPA-compliant notice at that time.

Children

The calculator is intended for adults estimating child support obligations. We do not knowingly collect data from anyone under 13.

Contact

Questions about privacy: see the contact information on the About page, or reach the project maintainer via the email listed there once it becomes available.

Changes to this policy

Updates to this policy will be reflected by the "Last updated" date above. Material changes (new data collection, new third-party processors) will be flagged at the top of this page for at least 30 days after publication.