Model Context Protocol (MCP) server for freee API integration
Nothing to run from here
Tax Engine is installed from its publisher's own source and answers where it runs, so this marketplace is not in the path of a single call. There is no address here to send one to, and a panel that pretended otherwise would be showing you an answer we made up. Install it and call it from your own client — the Installation tab has the entry for each one.
96/100
tool-list score
14
tools declared
remote
at its publisher
—
calls last 7d
What it does
Deterministic Czech OSVC tax tools for 2026: tax, insurance, deadlines, VAT and exchange rates.
Quickstart
# 1 — add it to Claude Code
claude mcp add --scope user --transport http tax-engine-mcp https://freelax.cz/api/mcp
# 2 — ask your agent for something these tools do
# compute_year, calc_set_aside, compare_regimes and 11 more
Tax Engine costs nothing on mcprush: there is no plan to choose here, no cap to set and nothing mcprush can bill you for.
Publishernot claimed
FRAll 1 server
freelax1 server
1 category
Collected from a public index. Nobody has claimed this account, so nothing here was written by its author — claim it if it is yours.
Installation
Where are you running it?
Every route below installs the same thing and ends at the same approval screen. Nothing here runs on your machine and nothing runs on ours: this server answers at its publisher’s own address, and what you install is the connection straight to it.
Claude Codedeclared by this listing
This is a public server: it answers at its publisher’s own address and this marketplace is not in the path. Claude Code registers it in one command; --scope user makes it available in every project. The transport below is http, as the publisher's own manifest declares it.
claude mcp add --scope user --transport http tax-engine-mcp https://freelax.cz/api/mcpReconnect, or start a new session, and the tools appear in the model’s tool list.
Free on mcprush, and it answers at its publisher’s own address: this marketplace is not in the path, so there is no key of ours to hold and no card to add.
What it writes
One config entry pointing straight at the publisher’s own address — this marketplace is not in the path, and nothing from this listing executes on your machine.
What you approve
14 tools, with what each one reads, writes and reaches shown before you agree — the same list on every route above. Read the tool surface.
Tool surface
What the model actually sees. Descriptions are diffed on every release — see version history.
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.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| taxYear | number | no | Only 2026 is supported because the engine currently has a 2026 ruleset |
| monthlyBusinessIncome | number | no | Gross monthly business income in CZK (§ 7 ZDP) |
| annualBusinessIncome | number | no | Exact annual business income in CZK; takes precedence over the monthly figure |
| rentalMonthlyIncome | number | no | — |
| taxRegime | string | no | — |
| targetRegime | string | no | Simulate a different regime without changing the stored facts |
| activityType | string | no | — |
| flatRatePercent | no | Flat-rate expense percentage as a decimal (0.4 / 0.6 / 0.8) | |
| citizenshipType | string | no | — |
| publicHealthStatus | string | no | — |
| isCzechTaxResident | boolean | no | — |
| isVATRegistered | boolean | no | — |
| employerCoversHealth | boolean | no | — |
| isNewOsvc | boolean | no | — |
| hasReducedSocialMinimum | boolean | no | — |
| isExemptFromMonthlyZalohy | boolean | no | — |
| isMarried | boolean | no | — |
| spouseIncomeUnderLimit | boolean | no | Spouse annual income under the sleva na manžela limit |
| hasChildUnder3 | boolean | no | — |
| children | array | no | — |
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 | Required | Notes |
|---|---|---|---|
| monthlyIncome | number | yes | Gross monthly business income in CZK (§ 7 ZDP) |
| rentalMonthlyIncome | number | no | Monthly rental income in CZK (§ 9 ZDP); triggers the mixed-income calculation |
| taxRegime | string | no | — |
| activityType | string | no | — |
| flatRatePercent | no | Flat-rate expense percentage as a decimal: 0.4 (other business), 0.6 (most freelancers / živnost volná), 0.8 (craft trades) | |
| advanceExempt | boolean | no | — |
| reducedMinimumBase | boolean | no | New OSVČ in the first 2 years (lower social minimum) |
| employerCoversHealth | boolean | no | — |
| secondaryThresholdExceeded | boolean | no | — |
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 | Required | Notes |
|---|---|---|---|
| annualIncome | number | yes | Gross annual business income in CZK |
| flatRatePercent | no | Flat-rate expense percentage as a decimal: 0.4 (other business), 0.6 (most freelancers / živnost volná), 0.8 (craft trades) | |
| isMarried | boolean | no | — |
| numberOfChildren | integer | no | — |
| spouseIncomeUnderLimit | boolean | no | Spouse annual income under the credit limit (sleva na manžela/manželku) |
| hasChildUnder3 | boolean | no | — |
| rentalAnnualIncome | number | no | — |
| deductions | object | no | — |
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 | Required | Notes |
|---|---|---|---|
| currentBand | string | yes | Band actually paid during the year |
| actualAnnualIncome | number | yes | — |
| monthsInRegime | integer | no | — |
| isProjection | boolean | no | True for a mid-year projection instead of a final settlement |
| flatRatePercent | no | Flat-rate expense percentage as a decimal: 0.4 (other business), 0.6 (most freelancers / živnost volná), 0.8 (craft trades) |
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.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| obligationType | string | yes | Obligation family: health/social insurance debt, tax_advance (záloha na daň), pausal (paušální daň payment), tax_return (late filing), prehled_* (late Přehled), annual_social (doplatek) |
| owedAmount | number | yes | Outstanding amount in CZK |
| daysOverdue | integer | yes | — |
| gracePeriodActive | boolean | no | — |
| dueDate | string | no | Original due date (YYYY-MM-DD); anchors the correct half-year repo rate |
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 | Required | Notes |
|---|---|---|---|
| amountEur | number | yes | Amount in EUR |
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 | Required | Notes |
|---|---|---|---|
| taxYear | integer | yes | The tax year the return is FOR (e.g. 2025 return is filed in 2026) |
| route | string | no | Filing route: standard_deadline = paper/no extension (1 April), self_electronic_extension = filed electronically after 1 April (+1 month), advisor_extension = filed by a tax advisor (1 July) |
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 | Required | Notes |
|---|---|---|---|
| taxYear | integer | yes | — |
| route | string | no | Filing route: standard_deadline = paper/no extension (1 April), self_electronic_extension = filed electronically after 1 April (+1 month), advisor_extension = filed by a tax advisor (1 July) |
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 | Required | Notes |
|---|---|---|---|
| year | integer | yes | — |
| date | string | no | Optional date (YYYY-MM-DD) to test for working-day status |
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 | Required | Notes |
|---|---|---|---|
| annualIncome | number | yes | Expected annual business income in CZK |
| citizenshipType | string | no | 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 private/commercial insurance only |
| publicHealthStatus | string | no | — |
| isVATRegistered | boolean | no | Full VAT payer (plátce DPH). Identifikovaná osoba is NOT blocking. |
| activityType | string | no | — |
| rentalAnnualIncome | number | no | — |
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 | Required | Notes |
|---|---|---|---|
| annualIncome | number | yes | — |
| flatRatePercent | no | Flat-rate expense percentage as a decimal: 0.4 (other business), 0.6 (most freelancers / živnost volná), 0.8 (craft trades) |
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 | Required | Notes |
|---|---|---|---|
| annualIncome | number | yes | — |
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 | Required | Notes |
|---|---|---|---|
| vatStatus | string | yes | Current VAT status of the OSVČ |
| vatStatusConfirmedAt | string | no | When the VAT status was last confirmed (freshness window 180 days) |
| foreignServicePurchase | string | yes | Foreign service purchases: none_confirmed = verified none, possible = maybe (e.g. runs online ads), qualifying_confirmed = a qualifying purchase from a non-CZ supplier is confirmed |
| foreignServicePurchaseConfirmedAt | string | no | — |
| purchaseDate | string | no | Date of the qualifying purchase; drives the 15-day § 97 registration deadline |
| foreignSales | array | no | Year-to-date foreign client income for the sales-side (§ 6i) check |
| today | string | no | Evaluation date; defaults to today |
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.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| topic | string | yes | — |
| locale | string | no | — |
Free
$0 forever
- Every tool — any call limit is its publisher’s, not ours
- No card, and mcprush charges nothing for it
- Runs at its publisher’s own address — this marketplace is not in the path
- Nothing to cap, because mcprush bills nothing
What counts against your monthly calls
| Tool | Unit | Calls used | Out of the allowance |
|---|
Nothing here is billable: mcprush charges nothing to install Tax Engine or to call it, at any volume.
Call allowance · this installenforced at the gateway
Monthly allowance, in calls
—
—
Alert at 80% · then the tool returns a normal MCP error
Used this month: —
ATool-list grade · score 96 / 100
Release 1.0.0 · scanned 20 Oct 2026
Graded from the tools this server lists, not from its source code.
Two independent axes, because powerful and malicious are different questions. The grade is threat only. The capability level is blast radius, and it is never a penalty on the grade — it is priced as one subtract-only term in the score, where you can see it.
Threat score100
Client score96
Findings0 threat · 0 capability
Capabilityminimal
Coveragemanifest
Verificationnot in this report
Surface digest0194c447d608d802295702a7827d2d7ef6d02d5ef188fcdbe4f824c84ef08835
Score vectorthreat 100 → client 96
| Term | Level | What it prices | Points |
|---|---|---|---|
| capability-exposure | minimal | capability blast radius (minimal) — client exposure if the model is manipulated | −0 |
| coverage-honesty | manifest | inspection depth (manifest) — how much of the target the scan could see | −4 |
score = clamp(round(threatScore − E_cap − E_ver − E_cov), 0, 100). No model, no opinion, no network call at scoring time: the same methodology version against the same bytes always produces this number, and every line above is a field of the report rather than a summary of it.
What the scan could actually read
A grade is only as meaningful as its coverage, so the scanner publishes its own depth before it publishes its result.
The scan read each tool’s name, description, input schema and annotations exactly as the server listed them the last time it answered us; no code was reviewed. We ask the server again about once a month, and a list that changed is graded again.
Tool surfaceread
Implementation sourcenot available
Package metadatanot available
Live transportnot available
The implementation source was not read — this reflects the declared tool metadata only.
Capability — what it could do if the model were manipulated
Tags derived from each tool’s schema and the implementation, not from what the tool calls itself. minimal is the level these add up to.
| Tool | Capability tags | Why the tag was assigned |
|---|---|---|
| compute_year | no tags | |
| calc_set_aside | no tags | |
| compare_regimes | no tags | |
| calc_flat_tax_settlement | no tags | |
| estimate_penalty | no tags | |
| convert_eur_czk | no tags | |
| get_filing_deadlines | no tags | |
| get_prehled_deadlines | no tags | |
| czech_working_days | no tags | |
| check_flat_tax_eligibility | no tags | |
| get_flat_tax_band | no tags | |
| check_thresholds | no tags | |
| check_io_trigger | no tags | |
| get_rule_source | no tags |
Toxic-flow graph
The lethal trifecta, checked as a graph rather than as a checklist: untrusted input, a sensitive source and an external sink have to meet before there is a path worth worrying about.
The public result for this release does not print the flow graph, so there is nothing to show here. That is not the same as "no paths were found": what the scan did read is above, under coverage.
Supply chain and provenance
Integrityfirst-seen
Surface digest0194c447d608d802
Scanned2026-10-20
This is the first scan of this surface here, so there is nothing yet to compare it against.
Every result on this tab comes from one deterministic pass over the published package — offline, rule by rule, and auditable line by line above. Same methodology version, same bytes, same score.
Release history
This is an address its publisher runs: which release it serves is theirs to choose, so there is nothing here to pin. The history below is for reading; the current release on file is 1.0.0.
1.0.0
undated
latestNo release note was published with this version.
—
no reviews yet
Who can review
One review per account, from a signed-in account that does not publish this listing. Nothing else is asked — you can say what you think before you install it. Publishers can reply once per review, and a review can be edited or deleted by whoever wrote it.
Sign in to write one
Any signed-in account that does not publish Tax Engine can review it, once — before installing it or after. A review from an account that has installed it is marked as one.
No reviews yet
Nobody has reviewed this listing. The rating on the card is the mean of the reviews written here and nothing else, so there is no rating until somebody writes the first — which takes a signed-in account that does not publish it, and nothing else.