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Australian Company Number (ACN) Check Digit

The ACN is a nine digit number with the last digit being a check digit calculated using a modified modulus 10 calculation.

ASIC has adopted a convention of always printing and displaying the ACN in the format nnn nnn nnn ie three blocks of three characters separated by a blank. This is to assist readability and the inserted blanks do not form part of the ACN.

For example, to validate the check digit for ACN 004 085 616:

(i) apply weighting to digits 1 to 8
Digit00408561
Weight87654321
Digit X Weight002403215121


(ii) sum the products 0 + 0 + 24 + 0 + 32 + 15 + 12 + 1 = 84

(iii) divide by 10 to obtain remainder 84 / 10 = 8 remainder 4

(iv) complement the remainder to 10 10 - 4 = 6

(if complement = 10, set to 0)

Thus calculated check digit (6) equals actual check digit (6) so ACN 004 085 616 is VALID.

Examples of valid ACNs include:
000 000 019000 250 000000 500 005000 750 005
001 000 004001 250 004001 500 009001 749 999
001 999 999002 249 998002 499 998002 749 993
002 999 993003 249 992003 499 992003 749 988
003 999 988004 249 987004 499 987004 749 982
004 999 982005 249 981005 499 981005 749 986
005 999 977006 249 976006 499 976006 749 980
006 999 980007 249 989007 499 989007 749 975
007 999 975008 249 974008 499 974008 749 979
008 999 979009 249 969009 499 969009 749 964
009 999 964010 249 966010 499 966010 749 961



Note that Australian Registered Body Numbers (ARBNs) and Australian Registered Scheme Numbers (ARSNs) are constructed using the same formula.


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