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, that is 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
| Digit | 0 | 0 | 4 | 0 | 8 | 5 | 6 | 1 |
| Weight | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 |
| Digit X Weight | 0 | 0 | 24 | 0 | 32 | 15 | 12 | 1 |
(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
Note: 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:
000 000 019 | 000 250 000 | 000 500 005 | 000 750 005 |
001 000 004 | 001 250 004 | 001 500 009 | 001 749 999 |
001 999 999 | 002 249 998 | 002 499 998 | 002 749 993 |
002 999 993 | 003 249 992 | 003 499 992 | 003 749 988 |
003 999 988 | 004 249 987 | 004 499 987 | 004 749 982 |
004 999 982 | 005 249 981 | 005 499 981 | 005 749 986 |
005 999 977 | 006 249 976 | 006 499 976 | 006 749 980 |
006 999 980 | 007 249 989 | 007 499 989 | 007 749 975 |
007 999 975 | 008 249 974 | 008 499 974 | 008 749 979 |
008 999 979 | 009 249 969 | 009 499 969 | 009 749 964 |
009 999 964 | 010 249 966 | 010 499 966 | 010 749 961 |
Note that Australian Registered Body Numbers (ARBNs) and Australian Registered Scheme Numbers (ARSNs) are constructed using the same formula.
ASIC Website: Printed 05/20/2013
