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COMPUTATION FORMULA OF MOD-7 CHECK DIGIT LOCATED UNDER

CBP Form 7512, "Transportation Entry and Manifest of Goods Subject to CBP Inspection and Permit"

To compute the check digit use the following formula:

Divide the assigned 8-digit in-bond serial number by 7;
Multiply the remainder by 7. The remainder is the single digit number after the period. If more than one digit appears as the remainder use only the first digit;
Round up that answer to the next whole number. This answer is the "Mod-7 Check Digit";
Mod-7 Check digit is then inserted at the end of the 8-digit serial number, which will then have 9-digits.

Example 1:

The assigned 8-digits serial number is: 25770003

25770003÷7 = 3681429.0;
0.0 x 7 = 0;
Zero ("0") is a whole number. Do not round up. Zero ("0") is the "Mod-7 Check Digit";
The in-bond number with the check digit will appear as follows: 257700030

Example 2:

The assigned 8-digits serial number is: 25770005

25770005÷7 = 3681429.2;
0.2 x 7 = 1.4;
"1.4" round up to the next whole number which is 2 (Two (2) is the "Mod-7 Check Digit");
The in-bond number with the check digit will appear as follows: 257700052

An example list of 21 serial numbers, with check digits, is shown below.

Note: The check digit can only be 0-6 and will repeat every seventh number.

257700004
257700015
257700026
257700030
257700041
257700052
257700063

257700074
257700085
257700096
257700100
257700111
257700122
257700133

257700144
257700155
257700166
257700170
257700181
257700192
257700203

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