Australian ACN Check Digit Calculator

How Australian ACN Check Digit Calculator Works?

The Australian ACN Check Digit Calculator works by multiplying the first 8 digits of the Australian Company Number (ACN) by weights 8 down to 1, dividing the sum by 10, and taking the complement of the remainder.

1. 1Enter the first 8 digits of the 9-digit ACN.
2. 2Multiply the digits by 8, 7, 6, 5, 4, 3, 2, and 1.
3. 3Add the products and compute the remainder modulo 10.
4. 4Compute (10 − remainder) mod 10 as the 9th digit.

Australian ACN Check Digit Calculator Formula

The ACN formula is Check = (10 − (Σ (9 − i)·dᵢ mod 10)) mod 10.

S = 8·d₁ + 7·d₂ + 6·d₃ + 5·d₄ + 4·d₅ + 3·d₆ + 2·d₇ + 1·d₈
Check = (10 − (S mod 10)) mod 10   (AUSTRALIAN ACN)

• dᵢ is the i-th ACN digit.

S = 114
Check = 6
ACN = 010 499 966

Australian ACN Check Digit Calculator Conversion Table

The ACN conversion table lists sample ACNs with their check digit and matching ABN.

What is Australian ACN Check Digit Calculator?

An Australian ACN Check Digit Calculator is a tool that computes the 9th digit of an Australian Company Number issued by the Australian Securities and Investments Commission (ASIC).

Every Australian company receives an ACN at registration, and the company's ABN is the ACN with 2 check digits in front.

What are the uses of Australian ACN Check Digit Calculator?

There are 3 main uses of the Australian ACN Check Digit Calculator, including company documents, ABN derivation, and KYC checks.

• Company documents: Companies must show their ACN on public documents and contracts.
• ABN derivation: Accountants compute the ABN from an ACN.
• KYC checks: Lenders validate ACNs before ASIC searches.