Can an e-invoice taxpayer use a cash register?

In today's world, where digital transformation is accelerating, both e-document applications and cash registers (POS) are of great importance for businesses.

Date: 02 March 2026

In today's rapidly evolving digital transformation environment, both e-document applications and cash registers (CRS) are of great importance to businesses. Taxpayers who have switched to the e-invoice system, in particular, frequently wonder whether they can use cash registers when making sales in the field or conducting retail transactions.

What is an e-Invoice?

An e-invoice is a document that has the same legal validity as a paper invoice, but is created, transmitted, and stored electronically. In Turkey, the e-invoice system is implemented by the Revenue Administration (GİB).

Taxpayers included in the e-invoice system issue and transmit their invoices electronically through the GİB system. No paper invoices are printed; the entire process is conducted digitally.

Key Features of e-Invoices

It has the same legal validity as a paper invoice.
It is transmitted through the GIB (General Directorate of Revenue) system.
It is archived electronically.
It saves costs and time.
It simplifies auditing and reporting processes.

What is a Cash Register (ÖKC)?

A Cash Register (ÖKC), commonly known as a "cash register," is a device that records retail sales transactions. It is primarily used to issue receipts for sales to end consumers.

In Turkey, traditional cash registers have largely been replaced by New Generation Cash Registers (YN ÖKC). These devices integrate with the Turkish Revenue Administration systems and also include POS functionality.

The Main Purpose of POS Systems:

To record retail sales
To prevent tax evasion and fraud
To document daily revenue
To support financial audit processes

Can an e-Invoice Taxpayer Use a Cash Register?

The short answer is: Yes, they can. To be more precise, being an e-Invoice taxpayer does not prevent the use of a cash register. In fact, it is mandatory in some cases.

In Which Cases Can It Be Used?

A business can be both an e-Invoice taxpayer and conduct retail sales. For example:

A company that conducts wholesale sales using e-Invoices
And also sells to end consumers through a store

In this case:

For wholesale sales - it issues e-Invoices
For retail sales - it issues cash register receipts

In other words, the systems do not exclude each other, but rather complement each other.

Differences Between e-Invoice and POS Devices

e-Invoice and POS devices are not alternatives to each other. However, there are significant differences in terms of their areas of use and functions. Let's examine these differences point by point:

e-Invoice is an invoice issuance system, while a POS device is a device that documents retail sales.
e-Invoice is generally used in business-to-business (B2B) sales; POS devices are used in sales to end consumers (B2C).
e-Invoice is created and transmitted entirely electronically; POS receipts are issued physically (digital records are also kept in new generation devices).
The e-Invoice system operates directly through the GIB (General Directorate of Revenue) infrastructure; POS devices transmit sales information to the GIB system at certain intervals.
In e-Invoice usage, the document type is "invoice"; in POS usage, the document type is "retail sales receipt".
e-Invoice obligation depends on certain turnover and sector conditions; The obligation to use a cash register depends on whether or not retail sales are made.

As can be understood from these points, the two systems serve different needs and can be used together in most businesses.

Is a Cash Register Mandatory for e-Invoice Taxpayers?

The answer to this question depends on the type of business activity.

Wholesale Only Businesses

If the business only sells to companies and documents all sales with invoices, there is no obligation to use a cash register.

Retail Businesses

If the business sells to end consumers (B2C), then the use of a cash register becomes mandatory.

For example:

Store
Market
Restaurant
Cafe
E-commerce company (in certain cases)

If there is retail collection, a cash register is required.

Next Generation POS and e-Invoice Integration

Next generation cash registers work in compatibility with e-document systems. Two important concepts come into play here:

e-Archive Invoice
e-Invoice
If a business that is subject to e-invoicing conducts retail sales and the buyer is a taxpayer, in some cases it may be necessary to issue an e-Invoice or e-Archive Invoice instead of a POS receipt.

POS Receipt or e-Invoice?

This is a very critical point.

If the Buyer is Not a Taxpayer

If the sale is made to the end consumer:

A POS receipt is issued.
An invoice can also be issued if requested.

If the Buyer is a Taxpayer

An e-invoice is issued if the amount exceeds certain limits.
A POS receipt may be for informational purposes only, but an invoice is essential.

What Happens If a Cash Register Is Not Used?

If a retail business does not use a Cash Register:

A penalty for irregularities may be applied.
A special penalty for irregularities may be imposed.
There may be a risk of a tax audit.

Therefore, it is important to establish a system suitable for the type of business.

Conclusion

Becoming an e-Invoice taxpayer does not eliminate the need for POS (Point of Sale) devices. If a business conducts retail sales, it is obligated to use a POS device even if it is included in the e-Invoice system.

In summary: