Privacy
The calculator runs on the page you already loaded. Pay figures you type are not sent to PaycheckZip.com unless you put them in the contact form.
What stays on the page
Share these numbers copies a link with the figures on the page. Opening that link fills the calculator, then removes the figures from the address bar. Anyone who still has the shared link can see those numbers. Copying the address afterward does not. It is not an account.
The contact form sends the name, email, page, and message you type, and only if you submit it. The server is not set up to store that message itself. It forwards the message when a delivery address is configured, and otherwise it refuses the note.
Analytics and ads
A Cloudflare analytics beacon or a Search Console verification tag is added only when the deployment is given that token. Advertising is off unless the deployment turns it on. There is no advertising partner in the default build.