Why we built an automated tax shield for Hungarian sole proprietors (KATA)

Hey Product Hunt community! 👋

Running a micro-business or freelancing under local European tax regulations can be a compliance minefield. In Hungary, entrepreneurs under the simplified KATA fixed-tax regime face strict limits: annual revenue caps, severe restrictions on corporate invoicing, and an immediate 40% retroactive penalty if they accidentally breach their threshold.

Most traditional invoicing apps only generate PDFs—they don't actively protect you from penalties or tell you when you risk crossing tax brackets.

We built Katazom.hu to eliminate tax anxiety. By connecting directly to the Hungarian National Tax and Customs Administration (NAV Online Számla 3.0 government API), Katazom:

• Synchronizes invoices automatically in real time (zero manual spreadsheet work).

• Automatically recalculates safe pro-rata limits when business activities are paused.

• Analyzes live invoice data to flag erroneous VAT rates before the tax authority does.

• Compares actual revenue against alternative tax regimes to show your real net take-home profit.

We'd love to hear your thoughts: How do you handle automated government tax reporting and compliance in your country?