Understanding Two-Dimensional Barcode (QR Code)

The Portuguese tax authority (AT) has published a requirement to include QR code in invoices and other tax-relevant documents. This measure aims to simplify the communication of invoices and better monitor taxpayer transactions for combating the informal economy, fraud, and tax evasion.

According to the Portuguese tax authority, transaction details required to create the QR code includes the following:

First-Party Tax Registration Number
Customer Tax Registration Number and Country
Document Type, Status, and Date
Document's Unique Identification
ATCUD
Tax Country Region
Taxable, Tax, and Total Amounts
Duty Stamp Amount
Hash Number
Software Certificate Number

The following is an example of a string used in QR code creation:

            
             A:123456789*B:999999990*C:PT*D:FT*E:N*F:20191231*G:FTAB2019/0035*
             H:CSDF7T5H-0035*I1:PT*I2:12000.00*I3:15000.00*I4:900.00*I5:50000.00*
             I6:6500.00*I7:80000.00*I8:18400.00*J1:PT-AC*J2:10000.00*J3:25000.56*
             J4:1000.02*J5:75000.00*J6:6750.00*J7:10000 0.00*J8:18000.00*K1:PT-MA*
             K2:5000.00*K3:12500.00*K4:625.00*K5:25000.00*K6:3000.00*K7:40000.00*
             K8:8800.00*L:100.00*M:25.00*N:64000.02*O:513600.58*P:100.00*Q:kLp0*R:9999*
             S:TB;PT00000000000000000000000;513500.58

Example of QR Code [47,096mm] and [452 characters]

(Size=2, ECC=M, Margin= 2 (0,25cm), Module[version]=17 -> 85x85)

Note: The system stores the QR code string in the Legal Document Header - Tag File (F74L301T).

See Portugal QR Code Fields Mappings (Doc ID 2308107.1)