Invoices and Billing Tools
March 5, 2026
Invoices and Billing Tools
Assuming you do not record 100% of your sales through an e-cash register or virtual cash register (ORP/VRP), you must issue invoices to your customers. To learn about the mandatory requirements for invoices, how online invoicing tools work, and whether it’s possible to create invoices manually, read the following article.
The following are required elements of an invoice:
- Identification of the Supplier and the Customer
- first and last name or business name
- the address of its registered office, place of business, and residence
- tax identification number
- invoice number
- the date on which the goods or services were delivered, or the date on which payment was received, if that date can be determined and if it differs from the date the invoice was issued
- invoice date
- the quantity and type of goods delivered or the scope and type of services provided
- the tax base for each tax rate, the unit price excluding tax, and discounts and rebates, if they are not included in the unit price
- the applicable tax rate or tax exemption; in the case of a tax exemption, a reference to the relevant provision of this Act or Council Directive 2006/112/EC of November 28, 2006, on the common system of value-added tax, as amended, or the statement “the supply is exempt from tax” must be provided
- the total tax amount in euros to be paid, excluding the tax amount applied in accordance with the special provisions of § 66
Online Options
There are companies in Slovakia that provide online invoicing tools. Once you log in, you can easily create an invoice. They also allow you to link to certain banks, giving you an overview of invoice payments. You can access the app from anywhere using your phone or computer. These services are compatible with major accounting software programs. This makes it very easy to generate an electronic report for your accountant, who can then upload the entire report to the accounting software at once, eliminating the need to manually enter the documents.
There is a fee for these services, but if you issue only a small number of documents per year, you may still qualify for the free plans. Among the best invoicing tools are Superfaktura, Minifaktura, and Idoklad.
There is no prescribed format for an invoice; in theory, it can even be written by hand on paper, provided that it includes all the required information listed on the invoice.
Manual Billing
You can also create invoices in Excel, for example. Clicking on the icon will display a sample invoice like this one, which you can customize to your liking.