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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, 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


Digit00408561
Weight87654321
Digit X Weight002403215121

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

(ii
i) 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.



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