Guides
Practical guides to e-invoicing, VAT and checking companies against public registers.
E-invoicing
Slovak e-invoicing from 1 January 2027: who it affects and how to check a customer can receive one
Who must issue and receive e-invoices in Slovakia from 2027, why they are addressed by tax number rather than company ID, what to do when a customer is not on Peppol, and how to check.
Getting ready to receive e-invoices in Slovakia: choosing a Digital Postman step by step
What every Slovak company and sole trader must do by 1 January 2027 to receive e-invoices: tax number, the Financial Administration portal, choosing and contracting a Digital Postman, what it costs and how to check it works.
VAT and tax
How to find a Slovak company's DIČ from its company ID (IČO)
Where a Slovak company's tax number (DIČ) can be found, why it is not in the business register, how it relates to the VAT ID, and why e-invoicing needs it from 2027.
A Slovak VAT ID does not make a VAT payer: registration under § 7 and § 7a
One in four Slovak companies with a VAT ID is not a VAT payer. What registration under § 7 and § 7a of the Slovak VAT Act means, why VIES cannot tell, and what it changes on an invoice.
Struck off the Slovak VAT register: what it means for the customer
Why the Slovak Financial Administration cancels VAT registrations, what an erasure means for invoices from that supplier, and how to find out in time.
Slovak tax reliability index: what highly reliable, reliable and less reliable mean
What the Slovak tax reliability index is, who has one, how often it changes, what it means for a company and how to read it when choosing a business partner.
Checking companies
Check a company right in ChatGPT and Claude: connecting Apino
How to connect Apino to Claude, ChatGPT, Claude Code or Cursor so the assistant answers about Slovak and Czech companies from the registers, not from the web. What it can do, what it costs and how to disconnect it.
How to check a Slovak business partner before signing a contract
A checklist from public Slovak registers: whether the company exists, who acts for it, VAT, the tax reliability index, financial statements, insolvency and e-invoicing — and why checking once is not enough.
When a Slovak company files its financial statements — and why a missing one may mean nothing yet
The deadline for filing financial statements in Slovakia follows the tax return and can move by three or six months. What that means when you look up a partner's statements in the register.
For developers
Slovak business register API: getting company data into your application
The Slovak commercial register has no public API. The options — processing the RPO open data yourself or using a ready API — and what to watch for when integrating.
Czech company data: the difference between RES and ARES
ARES and RES are often confused. What each is, who runs it, what it contains, and which to use when you need data on a Czech company or the full list.