Deterministic Czech OSVC tax tools for 2026: tax, insurance, deadlines, VAT and exchange rates.
| Endpoint | https://freelax.cz/api/mcp (streamable-http) |
|---|---|
| Registry version | 1.0.0 |
| Now | 14 tools · grade B (88) · pin ts_054b98da35e7ff29b4e6a796ba9b372b · protocol 2025-06-18 |
| First / last listed | 2026-10-31 01:02 UTC / 2026-10-31 01:02 UTC |
| Grade over time | 2026-10-31: B (88), 14 tools |
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Tools: compute_year calc_set_aside compare_regimes calc_flat_tax_settlement estimate_penalty convert_eur_czk get_filing_deadlines get_prehled_deadlines czech_working_days check_flat_tax_eligibility get_flat_tax_band check_thresholds check_io_trigger get_rule_source
compute_year | Computes a full Czech OSVČ tax year from personal facts: income tax with credits (children, spouse, deductions), social and health insurance, monthly set-aside, safe-to-spend, flat-tax band and regime-eligibility evaluation. All figures come from the deterministic Freelax engine, never from the model. params: taxYear, monthlyBusinessIncome, annualBusinessIncome, rentalMonthlyIncome, taxRegime, targetRegime, activityType, flatRatePercent, citizenshipType, publicHealthStatus, isCzechTaxResident, isVATRegistered, employerCoversHealth, isNewOsvc, hasReducedSocialMinimum, isExemptFromMonthlyZalohy, isMarried, spouseIncomeUnderLimit, hasChildUnder3, children, disabilityGrade, hasZTP, deductions |
calc_set_aside | How much of a monthly OSVČ income to set aside for Czech income tax, social and health insurance, and what remains safe to spend. Supports mixed §7 business + §9 rental income and the paušální daň (flat tax) regimes. params: monthlyIncome*, rentalMonthlyIncome, taxRegime, activityType, flatRatePercent, advanceExempt, reducedMinimumBase, employerCoversHealth, secondaryThresholdExceeded |
compare_regimes | Compares the standard OSVČ regime against paušální daň (flat tax) for a yearly income, including tax credits that would be lost with the flat tax (children, spouse), and recommends the cheaper regime. params: annualIncome*, flatRatePercent, isMarried, numberOfChildren, spouseIncomeUnderLimit, hasChildUnder3, rentalAnnualIncome, deductions |
calc_flat_tax_settlement | Given the paušální daň band you paid and the actual annual income, computes whether you owe a doplatek (top-up), get a vratka (refund), or must exit the flat-tax regime (income above 2,000,000 CZK). params: currentBand*, actualAnnualIncome*, monthsInRegime, isProjection, flatRatePercent |
estimate_penalty | Estimates the Czech penalty/interest for a late payment or filing: repo rate + 8 p.p. for insurance and tax interest (3.5% H1 / 3.75% H2 2026), 3 grace days for tax payments, 200 CZK health aggregation floor and the 1,000 CZK tax non-assessment threshold. A dated estimate is rejected when its required rate period falls outside the implemented history. params: obligationType*, owedAmount*, daysOverdue*, gracePeriodActive, dueDate |
convert_eur_czk | Converts an EUR amount to CZK using the Czech National Bank daily exchange rate (the rate used for Czech tax purposes). Reports the rate, its publication date and whether a stale cached ČNB publication had to be used. Fails closed when no verified ČNB rate is available. params: amountEur* |
get_filing_deadlines | Deadline for the Czech personal income tax return (DPFO) for a given tax year, per filing route: paper, self-filed electronic, or via tax advisor. Weekend and holiday shifts are applied. params: taxYear*, route |
get_prehled_deadlines | Filing deadlines for the annual OSVČ Přehled o příjmech a výdajích for both social insurance (ČSSZ) and the health insurer, per tax-return filing route, plus the payment due date (8 calendar days after the filing deadline). params: taxYear*, route |
czech_working_days | Czech public holidays for a year (including movable Easter feasts) and, for a specific date, whether it is a working day and the next working day a statutory deadline would shift to. params: year*, date |
check_flat_tax_eligibility | Screens whether an OSVČ may enter or stay in the paušální daň (flat tax) regime: public health insurance participation (decisive for foreigners), VAT-payer status, income ceiling 2,000,000 CZK, side income and secondary activity. Returns reasons with severity. params: annualIncome*, citizenshipType, publicHealthStatus, isVATRegistered, activityType, rentalAnnualIncome |
get_flat_tax_band | Which paušální daň band (pásmo 1/2/3) an annual income falls into given the expense flat-rate, the current monthly payment for that band, and the next income threshold to watch. params: annualIncome*, flatRatePercent |
check_thresholds | Checks an annual income against the four statutory thresholds: VAT registration 2,000,000 CZK, immediate VAT registration 2,536,500 CZK, the 23% higher tax bracket, and the paušální daň eligibility ceiling. Reports approaching (90%), exceeded and remaining amounts. params: annualIncome* |
check_io_trigger | Checks whether buying services from abroad (Google Ads, Meta, ChatGPT, hosting…) or selling services to EU businesses has made an OSVČ an identifikovaná osoba under § 6h/§ 6i ZDPH, with the 15-day registration deadline (§ 97) and fact-freshness handling. Verdict: ok / check / act_now. params: vatStatus*, vatStatusConfirmedAt, foreignServicePurchase*, foreignServicePurchaseConfirmedAt, purchaseDate, foreignSales, today |
get_rule_source | For a Czech OSVČ tax topic, returns the governing rule with current values, primary-source citations (zákon, ČSSZ, VZP, Finanční správa) with verification dates, and related Freelax articles. Topics: pausalni_dan, identifikovana_osoba, dph_registrace, zalohy, prehledy, penale, danove_pasmo_23, vedlejsi_cinnost. params: topic*, locale |
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