SteuerKlar - German tax calculators that show their work

Hey PH! I built SteuerKlar after spending too many evenings trying to figure out my wife's Elterngeld. Every calculator we found was a black box — enter numbers, get one number, trust it. Ours does the opposite: every step is shown (assessment income per § 2c BEEG, the 67%→65% progression, all the bonuses), every value is checked against the law text itself, and the 2026 rules are fully updated — including the income limit (€175,000 zvE) that most sites still get wrong. No signup, no cookies, no tracking — it runs entirely in your browser. Happy to answer anything about how German tax math works 🙌