A fiscal receipt documents a sale to the final consumer. NUIKF and the QR code are central to identification and verification in the electronic system.
What is NUIKF?
NUIKF is the unique identifier of a fiscal receipt. It supports verification, traceability and the link between a corrective receipt and the original.
Why the QR code matters
The QR code is present on printed and electronic receipts and contains receipt data with a digital signature. It is also generated when immediate reporting is unavailable.
- Scannable by a phone.
- Connects to ATK verification.
- Helps compare amount, date and identifier.
What staff should check
The receipt must remain readable, the QR code should not be clipped and the fiscal status should be clear. Printer quality is an operational part of reliable verification.
QR remains mandatory offline
Every final-consumer receipt carries QR on paper or electronically. It includes receipt data and the digital signature even when reporting is pending because of connectivity or service availability.
A printed SEF offline receipt also says “OFFLINE”, and chronological numbering is preserved.
What the buyer sees after scanning
The system may show successful registration or a reportable problem. An offline receipt may need later verification; after more than 48 hours, non-registration is analyzed under the circumstances set by the Instruction.
A mismatch in NUIKF, total, date or QR parameters requires review and can be reported through “Denonco” or an ATK office.
The buyer’s post-receipt duty
The buyer keeps the paper receipt or proves electronic receipt until 30 metres after leaving the seller’s premises and presents it if requested by an authorized officer.
The business should keep printing and QR quality readable because real verification also depends on the physical document.
Receipt control in daily work
A receipt must be readable as a document and verifiable as data. Staff check the total, payment method and status before the customer leaves; managers investigate mismatches and corrections from system history rather than memory.
Printer quality, electronic delivery and QR readability are parts of the same process.
Traceability after the sale
Keep the connection between the sale, receipt, operator, device and any correction. It shortens customer-service searches and makes shift reconciliation more reliable.
- Compare the document with transaction history.
- Do not alter completed documents outside a correction flow.
- Review pending receipts after reconnection.
- Keep the reason and author of a correction.
Pre-launch check
Use this guide as a basis for discussion with your team and software provider. The actual setup depends on your activity, locations and internal procedures.
- Define items, tax rates, prices and payment methods.
- Set operator roles and shift responsibilities.
- Test sales, corrections, offline work and reports.
- Document the workflow and train staff before activation.
Practical questions
Does a delayed result mean the receipt is invalid? +
Not necessarily. An offline receipt may be registered later within the allowed period, and the buyer may be asked to verify again.
Can a receipt be checked without scanning QR? +
Yes. The Instruction also allows manual lookup, for example with NUIKF, or an ATK-office check in special cases.
What should staff do when receipt status is unclear? +
Do not repeat the sale immediately. First inspect transaction status and history, then follow the business or support procedure.
Why preserve the original receipt reference? +
It keeps a correction traceable and explains what changed, who made it and which document it concerns.
Is QR required when a receipt cannot be reported immediately? +
Yes. The instruction requires QR on paper or electronic receipts even when immediate fiscalization is unavailable because of connectivity or service status.
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