An online tool should help before the invoice is saved: flag missing company ID, tax ID, delivery date, line items, or an unsupported VAT rate.
Basic identity data
According to the Slovak Financial Administration guidance for issuing invoices, an invoice should contain supplier and customer details, especially name, address, and identifiers depending on the case.
In practice, a Slovak issuing company should have company ID and tax ID filled in. If it is a VAT payer or charges VAT, VAT ID also matters.
Number, dates, and line items
The invoice needs a clear sequential number, issue date, and delivery or supply date when it differs from the issue date. Due date is not a replacement for supply date.
Line items should describe the quantity and type of goods or the scope and type of service. For VAT invoices, taxable base, VAT rate, and VAT amount must be consistent.
How OnlineOffice checks it
OnlineOffice checks company data, customer data, dates, line items, Slovak VAT rates, and the link to PDF, archive XML, and eInvoice UBL output.
It is not a replacement for an accountant or legal advice. It is a practical guardrail against saving invoices with missing data that can be caught immediately.
FAQ
Should a Slovak company show tax ID on the invoice?
In normal business practice, yes. OnlineOffice therefore treats tax ID as required for Slovak issuing-company invoice workflows.
Is mandatory invoice details in slovakia: a practical checklist legal or accounting advice?
No. OnlineOffice provides working tools and materials. Important outputs should be reviewed against the specific situation.