Deterministic Czech OSVC tax tools for 2026: tax, insurance, deadlines, VAT and exchange rates.
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https://freelax.cz/api/mcp14 tools · 483mscompute_yearComputes 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 mod…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 mod…
| Parameter | Type | Description |
|---|---|---|
| taxYear | number | Only 2026 is supported because the engine currently has a 2026 ruleset |
| monthlyBusinessIncome | number | Gross monthly business income in CZK (§ 7 ZDP) |
| annualBusinessIncome | number | Exact annual business income in CZK; takes precedence over the monthly figure |
| rentalMonthlyIncome | number | — |
| taxRegime | string | — |
| targetRegime | string | Simulate a different regime without changing the stored facts |
| activityType | string | — |
| flatRatePercent | — | Flat-rate expense percentage as a decimal (0.4 / 0.6 / 0.8) |
| citizenshipType | string | — |
| publicHealthStatus | string | — |
| isCzechTaxResident | boolean | — |
| isVATRegistered | boolean | — |
| employerCoversHealth | boolean | — |
| isNewOsvc | boolean | — |
| hasReducedSocialMinimum | boolean | — |
| isExemptFromMonthlyZalohy | boolean | — |
| isMarried | boolean | — |
| spouseIncomeUnderLimit | boolean | Spouse annual income under the sleva na manžela limit |
| hasChildUnder3 | boolean | — |
| children | array | — |
| disabilityGrade | string | — |
| hasZTP | boolean | — |
| deductions | object | — |
calc_set_asideHow 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.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.
| Parameter | Type | Description |
|---|---|---|
| monthlyIncome* | number | Gross monthly business income in CZK (§ 7 ZDP) |
| rentalMonthlyIncome | number | Monthly rental income in CZK (§ 9 ZDP); triggers the mixed-income calculation |
| taxRegime | string | — |
| activityType | string | — |
| flatRatePercent | — | Flat-rate expense percentage as a decimal: 0.4 (other business), 0.6 (most freelancers / živnost volná), 0.8 (craft trades) |
| advanceExempt | boolean | — |
| reducedMinimumBase | boolean | New OSVČ in the first 2 years (lower social minimum) |
| employerCoversHealth | boolean | — |
| secondaryThresholdExceeded | boolean | — |
compare_regimesCompares 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.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.
| Parameter | Type | Description |
|---|---|---|
| annualIncome* | number | Gross annual business income in CZK |
| flatRatePercent | — | Flat-rate expense percentage as a decimal: 0.4 (other business), 0.6 (most freelancers / živnost volná), 0.8 (craft trades) |
| isMarried | boolean | — |
| numberOfChildren | integer | — |
| spouseIncomeUnderLimit | boolean | Spouse annual income under the credit limit (sleva na manžela/manželku) |
| hasChildUnder3 | boolean | — |
| rentalAnnualIncome | number | — |
| deductions | object | — |
calc_flat_tax_settlementGiven 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).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).
| Parameter | Type | Description |
|---|---|---|
| currentBand* | string | Band actually paid during the year |
| actualAnnualIncome* | number | — |
| monthsInRegime | integer | — |
| isProjection | boolean | True for a mid-year projection instead of a final settlement |
| flatRatePercent | — | Flat-rate expense percentage as a decimal: 0.4 (other business), 0.6 (most freelancers / živnost volná), 0.8 (craft trades) |
estimate_penaltyEstimates 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 requi…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 requi…
| Parameter | Type | Description |
|---|---|---|
| obligationType* | string | Obligation family: health/social insurance debt, tax_advance (záloha na daň), pausal (paušální daň payment), tax_return (late filing), prehled_* (late Přehled)… |
| owedAmount* | number | Outstanding amount in CZK |
| daysOverdue* | integer | — |
| gracePeriodActive | boolean | — |
| dueDate | string | Original due date (YYYY-MM-DD); anchors the correct half-year repo rate |
convert_eur_czkConverts 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.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.
| Parameter | Type | Description |
|---|---|---|
| amountEur* | number | Amount in EUR |
get_filing_deadlinesDeadline 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.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.
| Parameter | Type | Description |
|---|---|---|
| taxYear* | integer | The tax year the return is FOR (e.g. 2025 return is filed in 2026) |
| route | string | Filing route: standard_deadline = paper/no extension (1 April), self_electronic_extension = filed electronically after 1 April (+1 month), advisor_extension =… |
get_prehled_deadlinesFiling 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).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).
| Parameter | Type | Description |
|---|---|---|
| taxYear* | integer | — |
| route | string | Filing route: standard_deadline = paper/no extension (1 April), self_electronic_extension = filed electronically after 1 April (+1 month), advisor_extension =… |
czech_working_daysCzech 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.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.
| Parameter | Type | Description |
|---|---|---|
| year* | integer | — |
| date | string | Optional date (YYYY-MM-DD) to test for working-day status |
check_flat_tax_eligibilityScreens 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.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.
| Parameter | Type | Description |
|---|---|---|
| annualIncome* | number | Expected annual business income in CZK |
| citizenshipType | string | eu = EU/EEA citizen; non_eu_public = non-EU participating in Czech public health insurance (e.g. dočasná ochrana, employment); non_eu_private = non-EU with pri… |
| publicHealthStatus | string | — |
| isVATRegistered | boolean | Full VAT payer (plátce DPH). Identifikovaná osoba is NOT blocking. |
| activityType | string | — |
| rentalAnnualIncome | number | — |
get_flat_tax_bandWhich 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.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.
| Parameter | Type | Description |
|---|---|---|
| annualIncome* | number | — |
| flatRatePercent | — | Flat-rate expense percentage as a decimal: 0.4 (other business), 0.6 (most freelancers / živnost volná), 0.8 (craft trades) |
check_thresholdsChecks 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.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.
| Parameter | Type | Description |
|---|---|---|
| annualIncome* | number | — |
check_io_triggerChecks 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.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.
| Parameter | Type | Description |
|---|---|---|
| vatStatus* | string | Current VAT status of the OSVČ |
| vatStatusConfirmedAt | string | When the VAT status was last confirmed (freshness window 180 days) |
| foreignServicePurchase* | string | Foreign service purchases: none_confirmed = verified none, possible = maybe (e.g. runs online ads), qualifying_confirmed = a qualifying purchase from a non-CZ… |
| foreignServicePurchaseConfirmedAt | string | — |
| purchaseDate | string | Date of the qualifying purchase; drives the 15-day § 97 registration deadline |
| foreignSales | array | Year-to-date foreign client income for the sales-side (§ 6i) check |
| today | string | Evaluation date; defaults to today |
get_rule_sourceFor 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, vedl…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, vedl…
| Parameter | Type | Description |
|---|---|---|
| topic* | string | — |
| locale | string | — |
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Deterministic Czech OSVC tax tools for 2026: tax, insurance, deadlines, VAT and exchange rates.
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