API and data terms

1. Tax-table data: CC BY 4.0

The tax-table data (the CSV and JSON downloads linked from calcbloc.com/data and the country tax-table pages, and the responses of the /api/v1/tax-tables endpoint) is © 2026 itmarkerz technologies, the publisher of CalcBloc, and licensed under the Creative Commons Attribution 4.0 International licence (CC BY 4.0). You may copy, share and adapt it for any purpose, including commercial use, as long as you give credit, link to the licence and say if you changed the figures, as the licence sets out. Credit it as "Data by CalcBloc (calcbloc.com/data)" with a link to calcbloc.com/data or to the tax-table page the figures come from. For example:

<p>Data by <a href="https://calcbloc.com/data">CalcBloc (calcbloc.com/data)</a>, licensed under <a href="https://creativecommons.org/licenses/by/4.0/">CC BY 4.0</a></p>

The attribution block in a tax-table response also meets this requirement if you show its text with its link. The licence covers CalcBloc's compilation of official figures: the selection and structure of the tables, the notes and the source records. The rates, bands and thresholds themselves are set by governments and tax agencies, and are not ours to license. For tax-table data, the licence takes precedence over anything in these terms; the fair-use limits in section 3 still apply to fetching it from the API. The same tables, with the full licence text, are published in the calcbloc-data repository.

2. Calculation results and embeds: attribution is required

Results from the API's other endpoints (calculations such as /api/v1/net-salary, /api/v1/employer-cost and /api/v1/compare, and the /api/v1/countries list), the embeddable calculators and widget, and the embeddable tables are not covered by the CC BY licence. Free use of them requires a visible link to calcbloc.com wherever they are displayed: on each web page, app screen, report or chart that shows them. The link must be readable by people (not hidden, not only in code or a footer of another page) and should say "Data by CalcBloc" or similar. Every API response includes the wording and the page to link to in its attribution block, and the embeds carry their own link; keep it visible. For example:

<p>Data by <a href="https://calcbloc.com">CalcBloc (calcbloc.com)</a></p>

3. Fair use

Free keys allow 5,000 requests a day and 60 a minute. Without a key, the reference endpoints allow 50 requests a day and 5 a minute per IP address. Cache responses on your side. Do not share keys, rotate addresses or use several keys to get around the limits. Higher volumes, use of calculation results without attribution and service commitments are available on commercial terms: contact us.

4. Accuracy

The figures come from official sources and the same engines as the calculators on calcbloc.com, and are checked as described in our methodology. They are estimates for information and planning, not tax, legal or financial advice. Show your users that they are estimates. We may correct figures at any time; we are not liable for decisions made on them (see the site terms and disclaimer). The CC BY licence, too, comes without warranties.

5. Keys and your details

We store the email address and website you give us, the signup date and your agreement to these terms, plus a one-way hash of your key. We use them only to run the API and to contact you about your key or changes to the API. Our privacy policy applies. We may revoke a key that breaks these terms, for example by not crediting CalcBloc or by abusing the limits.

6. Changes

We may change the API, the limits or these terms. Breaking changes get a new version path (/api/v2) and a notice in the changelog. A change to these terms does not withdraw the CC BY licence from tax-table data you have already received. These terms are offered by itmarkerz technologies, which runs CalcBloc.