Global Privacy Policy

Effective Date: May 25, 2026

1. The Zero-Knowledge Imperative

US UK Tax Tool is engineered with a fundamental respect for data privacy. Unlike traditional corporate finance web dashboards which collect, harvest and resell user accounting profiles, we operate a Zero-Knowledge client-side design.

All variable assessments, sliders adjusting, and computed margins occur purely within your browser core. We have no backend databases storing your revenues, we utilize no tracking analytics tools, and we maintain complete data isolation.

2. Browser Storage & State Isolation

Some of our tools support pipeline caching utilizing standard browser localStorage to allow users to save their current active rosters (e.g., project name lists in the Agency Modeler). This data is completely isolated within your specific device browser and is never uploaded, synced, or shared over the internet. You can wipe this local storage anytime by clearing your browser site settings.

3. Secure Tax Filing Portal Data Handling

The US UK Tax Tool Filing Portal utilizes a Stateless Proxy Architecture for transmitting data to HMRC.

• OAuth 2.0: We utilize industry-standard OAuth 2.0 for authentication. Your login credentials are handled directly by HMRC's secure gateway; we never see or store your government passwords. The platform connects directly to official tax authority APIs via this protocol.
• Anti-Fraud Telemetry: To comply with HMRC fraud prevention mandates, our backend automatically logs and transmits required network telemetry headers, including X-Client-IP, X-Client-User-Agent, and X-Client-Device-ID.
• Transmission Data: When you submit a return, your tax data is passed through our secure server to HMRC using AES-256 encryption. This data is held in volatile memory only for the duration of the transmission and is immediately purged upon completion.
• Zero Persistence: We do not maintain a database of your National Insurance Numbers, income figures, or filing history. Your "Submission Receipt" is generated client-side and should be saved by you for your records.

4. Data Sharing & Zero Monetization

We maintain a strict policy of zero third-party monetization. We guarantee that your user financial records and telemetry data are never sold, rented, or shared with third-party advertisers or data brokers.

5. External Links & External Content

Our pages contain links enabling smooth navigation across our multiple calculators. If you visit any external legal resources links, check their individual privacy statements. We assume no responsibility for third party contents.

6. GDPR & CCPA Compliance Statement

Because we do not collect, transmit, structure, or process *any* personally identifiable information (PII) or financial parameters, we hold no personal credentials matching GDPR, California Consumer Privacy Act (CCPA), or Gramm-Leach-Bliley Act (GLBA) definitions. There is no portal registry to audit, correct, or delete, ensuring your maximum safety by absolute default.

7. Google AdSense and Third-Party Cookies

Third-party vendors, including Google, use cookies to serve ads based on a user's prior visits to this website. Google's use of advertising cookies enables it and its partners to serve ads to users based on their visit to this site and/or other sites on the Internet. For more detailed information, please see our Cookie Policy.

Users may opt out of personalized advertising by visiting Google Ads Settings or www.aboutads.info.

8. Updates & Auditing

We update this statement periodically to correspond to changes in on-device features. Any updates will remain committed to keeping your financial calculations perfectly private.