Kybernaut IČO DIČ is for WooCommerce stores that sell to businesses. It adds IČO, DIČ and IČ DPH fields (company ID and VAT numbers) to the billing address and checks that the entered values really exist – in the ARES and VIES databases, or with a mathematical check only. For a Czech billing address, the customer only needs to enter the IČO, and the plugin fills in the company, DIČ, address, city and postcode from ARES.

The plugin doesn’t support the block checkout. Use the shortcode checkout or the “Classic checkout” block.

What it does

Czech Republic: validates IČO and DIČ in ARES and VIES, or with a mathematical check only.
ARES autofill: fills in the company, DIČ, address, city and postcode based on the IČO.
Slovakia and the EU: validates the VAT number via VIES; for Slovakia, a format check alone also works.
VAT exemption: once you turn it on in the settings, business customers from another EU country with a VIES-verified VAT number are exempt from VAT.
Checkout and My Account: the fields appear on both pages, and you can edit them in the admin on both the customer profile and the order.
Buying as a company: hide the company fields behind a toggle, and you can move the Country field above it.
ARES or VIES outage: you can accept the order even when validation fails for technical reasons. You’ll see a notice in the admin notification email and in the order details.
Works with other plugins: SuperFaktura, PDF Invoices & Packing Slips, Woo iDoklad and other plugins by Toret, as well as Kybernaut Mailstep. Fluid Checkout is only partially supported.

Settings

Configure the plugin in WooCommerce → Settings → General, in the Kybernaut IČO DIČ settings section. VIES validation needs the SoapClient PHP library on your server, so ask your host about it. Developers can change the fields’ CSS classes with the woolab_icdic_class_billing_ic and woolab_icdic_class_billing_dic filters, and use the woolab_icdic_update_user_meta filter so that changing the IČO and DIČ on an order also updates the customer’s details. For Woo iDoklad, enter the _billing_ic, _billing_dic and _billing_dic_dph fields in its settings.

Get involved

The plugin is free and open source. Reporting a bug, suggesting an improvement or leaving a review helps it most.

Do you need customization?

Modifications that will enhance the plugin development and help other users I offer for “adoption”. You pay half the development cost and I’ll deliver the other half for free.

If the modifications are only of limited use, are only for your usage, or do not match my idea of the plugin’s direction, they are charged at full price.

Give me a call or shoot me an e-mail

Changelog

1.11.2 (2026-08-07)

Compatibility: Declared compatibility with WordPress 7.0.3 and WooCommerce 11.0.0.
Fix: The admin order-save handler no longer performs a full $order->save() on every order save. IČO/DIČ/IČ DPH meta is now written only when the submitted values actually changed, and persisted via save_meta_data() instead of a full order save. This keeps the plugin out of the multi-plugin save cascade on woocommerce_process_shop_order_meta that – combined with other plugins calling $order->save() on the same hook – could inflate order totals recalculated by WooCommerce core.

Older versions (44)

1.11.1 (2026-07-27)

Performance: ARES and VIES lookup results are now cached for 24 hours, so a checkout no longer queries ARES twice for the same IČO and logged-in EU B2B customers no longer trigger a VIES request on every page load. Only definitive answers are cached – registry outages are retried on the next request. Cache duration is filterable via woolab_icdic_ares_cache_ttl and woolab_icdic_vies_cache_ttl.
Security: The admin order-save handler now requires the edit_shop_orders capability and properly unslashes submitted values before saving order/user meta.
Security: Company identifiers (IČO, DIČ, IČ DPH) are now HTML-escaped in formatted addresses and PDF invoice output.
Fix: Slovak DIČ validation now returns a proper boolean – previously an all-zero DIČ passing the format check was wrongly treated as invalid.
Fix: ARES address parsing no longer causes errors when address fields (street, postcode, city) are missing in the registry response.
Fix: The legacy WooCommerce < 2.7 AJAX customer-details handler now sanitizes the user_id parameter.
Fix: SuperFaktura compatibility (thanks @lukasprelovsky)

1.11.0 (2026-06-29)

Maintenance: Internal code refactoring and added automated tests. No change to checkout behaviour, validation messages, or settings.
Fix: The SK-only “VAT reg. no.” (IČ DPH) field now shows only for Slovak orders on the admin order edit screen. Two issues were fixed: an off-by-one country comparison ($country[0] only checked the first character) in the field definition, and the country-based show/hide script not loading on HPOS order edit screens, which left the field visible on Czech orders.
Fix: Fatal error on every page load for logged-in EU B2B customers when VIES was unavailable – ViesException was re-thrown from the init hook and the update_order_review AJAX call; the exception is now caught, logged, and treated as “not exempt” instead.
Fix: ARES mismatch notice for Tax ID field incorrectly reported the field as “Business ID”.
Fix: Leftover debug get_user_meta() call appended stray text to the Settings link in the admin notice.
Fix: Admin script/style enqueue arguments – wp_enqueue_style() received the plugin URL as its dependencies parameter; admin-edit.js and admin.js shared the same handle so one silently failed to load; version parameter was missing from all admin enqueues.
Fix: ARES autofill checkbox setting default changed from the invalid 'false' to the correct 'no'.
Security: ajaxAres endpoint now verifies a nonce and sanitizes the ico request parameter.
Security: Notice-dismiss AJAX endpoint is restricted to authenticated users with the manage_woocommerce capability and now requires a nonce.
Security: Raw $_POST reads in checkout validation wrapped in wc_clean( wp_unslash() ), consistent with the rest of the codebase.

1.10.5 (2026-03-25)

Feature: Added a setting to disable the DIČ / IČ DPH match validation for Slovakia. Useful for non-profit organizations where IČ DPH does not match “SK” + DIČ. Go to WooCommerce > Settings > General > Kybernaut IČO DIČ options.

1.10.4 (2026-03-19)

Fix: VAT exemption not applied when “Buying as a company” toggle is disabled. When the toggle was off (fields always visible), the VAT exempt check silently failed because it required a non-existent checkbox to be checked.

1.10.3 (2026-03-18)

Fix: “Trying to access array offset on null” error on checkout when shipping_country or ship_to_different_address POST fields are not set (e.g. when shipping to billing address).
Fix: Added missing isset() checks in VAT exempt validation for parsed POST data.

1.10.2 (2025-11-28)

Fix: Don’t autofill DIC (Tax ID) for companies with terminated VAT registration (ZANIKLY). The plugin now checks VAT registration status from ARES and only autofills DIC when the status is AKTIVNI (active). See support forum.

1.10.1 (2025-05-13)

Added a new filter woolab_icdic_enable_dic_dicdph_match_check to disable the DIČ and IČ DPH match validation. For more details, see the support thread.

1.10.0 (2025-04-24)

Performance improvement: function donetyping is replaced by debounce function by @morvy, #74 fixing issue #73
Fix: Shipping country and VAT country prefix must match (paid by a supporter) (before only billing & VAT number matched).
Feature: Add basic logger.

1.9.1 (2024-11-14)

Fix: Greek VAT number validation – VAT country prefix (EL) doesn’t match WooCommerce coutry code (GR).

1.9.0 (2024-06-28)

Feature: New checkbox “Ignore when ARES or VIES check fails for technical reasons” in plugin settings. If this option is enabled and validation of business ID or VAT number fails for technical reason (not because it is invalid), an order is placed. For orders at which validation fails, there is an alert at admin edit screen and in admin e-mail. Big thanks to @PavelVybiral #72

1.8.2 (2024-01-09)

Feature: added support for WooCommerce PDF Invoices and Packing Slips for WooCommerce by Acowebs (sponsored by tuningmotocyklov.sk)
Fixed compatibility with Fluid Checkout (using the JS they provided me)

1.8.1 (2024-01-05)

Fix: Bump minimum PHP compatibility to 7.3 (will be increased soon to 8.0).

1.8.0 (2024-01-05)

Fix: VAT exempt checkbox default to off.
Fix: Work with new ARES API (the old in previous versions has been discontinued by the end of 2023). For initial solution and pointing to the thanks to @lukas-tomoszek.
Feature: Prefix dependencies to avoid conflicts (using wpify/scoper)
Add test validating Ares REST API check and processing.

1.7.5 (2023-12-19)

Fix: Accidentally broken toggle switch in 1.7.4.
Declare incompatibility with checkout blocks.

1.7.4 (2023-11-20)

Fix: Additional check – billing country and VAT country prefix must match for SK IC DPH.
Feature: Added compatibility with Fluid Checkout for WooCommerce – Lite.
Feature: Added a filter woolab_icdic_check_billing_country_and_dic allowing to disable the feature introduced in 1.7.3.

1.7.3 (2023-10-08)

Feature: Localize address format for all EU countries.
Feature: Additional check – billing country and VAT country prefix must match (paid by a supporter).

1.7.2 (2023-08-02)

Fix: non HPOS WooCommerce edit order – load IC DIC values #60
Fix: ICO – load the city district (NCO) if the street (NO) is not filled in (case when the street = city name) #62
Several code updates and cleanup #61

1.7.1 (2023-07-26)

Fix: Fatal error while updating manually order status #59

1.7.0 (2023-07-25)

Feature: HPOS support – together with @morvy, #55
Feature: VAT extempt – thanks to @morvy, #48
Feature: Math validation for Slovak IC DPH – thanks to @morvy, #56
Fix: Checked “Buying as a company” while any of Company related fields is filled – thanks to @morvy, #48
Fix: Validation of CZ DIC with different length than 10 numbers – thanks to @morvy, #56

1.6.7 (2022-01-12)

Fix: Checkbox buy as a company – data are sent even when unchecked – thanks to @morvy

1.6.6 (2021-11-05)

Fix: jQuery 3.x compatibility #41 – thanks to @morvy
Fix: Notice: Undefined variable: dic #43 – thanks to @morvy

1.6.5 (2021-10-01)

Fix: VAT label CSS bug #40 – thanks to @morvy

1.6.4 (2021-04-05)

Fix: prefix toggle CSS class.
Fix: call an old function in SK DIČ validation.
Improve: remove duplicate class on IČ DPH.
Improve: validate ARES only when CZ selected (when the country is re-selected again).
Load toggle CSS only when used.

1.6.3 (2021-02-24)

Feature: Add compatibility with PHP 8

1.6.2 (2021-02-24)

Fix: VAT Validation error.

1.6.1 (2021-02-24)

Bump the version after SVN issues with “vendor” file

1.6.0 (2021-02-24)

Fix: Add correct classes on checkbox input for “Buy as Company”
Update dependencies: VAT composer library to 2.0.5
Bump minimum requirements to 7.1 (due to Composer dependency)

1.5.4 (2020-12-02)

Fix: Don’t validate without billing country #27 – thanks to @morvy

1.5.3 (2020-11-09)

Compatibility with WooCommerce SuperFaktura
Compatibility Kybernaut Mailstep

1.5.2 (2020-10-13)

Fix wrong assets path.
Use more general CSS selectors for better compatibility.

1.5.1 (2020-09-17)

Fix issues with quotes – #25
Add custom filter for disabling required DIC when ICO filled for SK add_filter( 'woolab_icdic_sk_required_ic_and_dic', '__return_false' ); – #26

1.5.0 (2020-07-20)

Fix: Slovak DIC validation fix, #22 – thanks to @morvy
Feature: Show/Hide toggle functionality, #24 – @morvy
Maintenance: Update language files and dependencies

1.4.0 (2019-09-05)

Fix: Strip spaces from ICO, DIC, DIC DPH fields (#8)
Fix: Validation of Slovak DIČ in Vies (#9)
Fix: Trigger update_checkout JS when address loaded
Performance: Don’t validate IČO in ARES when the value has not been changed, called after ‘donetyping’
Maintenance: Update node_modules

1.3.3 (2018-11-18)

Compatibility with WC 3.5.1 which has “fixed” old ordering of checkout fields #21763

1.3.2 (2018-08-14)

Fix: Use number for address in ARES when no correct land registry and hous number are not filled (@pryx)

1.3.1 (2018-06-03)

Fix: Show “IČ DPH” on “Manually add new order” screen when “Slovakia” selected
Fix: Correct validation “IČ DPH” (with SK prefix) and “DIČ” (without SK prefix)
Fix: Remove the WC nonce check (already checked in WC itself)
Fix: Problem with loading plugin options
Added “How to” for Woo iDoklad to readme.txt
Update .pot source file.

1.3.0 (2018-02-21)

Fix: Display “VAT reg. no.” field in Order Billing-edit.
Fix: Compatibility with WooCommerce Sequential Order Numbers (#3)
Performance: CSS in admin.
Feature: Validation for Czech Business ID (via ARES)
Feature: Autofill for fields such as Company, VAT number, Address, City, and Postcode based on Czech Business ID (via ARES)
Feature: Validation of VAT (via VIES)
Added: Plugin settings to WooCommerce->Settings->General
Fields moved after “company” field.

1.2.0 (2018-02-08)

Fixed: Editing Business ID and VAT values within order in admin backend
Feature: Texts in plugin only in English (Czech as a translation)
Feature: Added woolab_icdic_class_{field_name} filters to customize class of added billing input fields
Feature: Added woolab_icdic_update_user_meta filter to enable updating user meta on order details edit
Added: Links to GitHub and Write a review to plugins page.
Added: Basic SK support (based on this article)

1.1.0 (2017-04-05)

Fix: “Order properties should not be accessed directly.” Added support for WooCommerce 3.0.

1.0.3 (2017-02-1)

Fix: display fields in My Account frontend page.
Add: support for WooCommerce PDF Invoices & Packing Slips.

1.0.2.1 (2016-12-15)

Feature: Created the GIT repository

1.0.2 (2016-09-05)

Fix: the term “IČ” to “IČO”.

1.0.1 (2016-07-18)

Feature: Checks billing country and validates IC & DIC if is set to CZ

1.0.0 (2016-07-16)

Initial release