ACC Earner's Levy - is it a private expense?

Hi! I did a fairly thorough search and I can't find this specific information anywhere. Can somebody tell me if I'm right/wrong?

I'm self employed, I invoice my clients as self-employed and I don't operate as a company. I've been paying my ACC levy once a year and only claiming the Work Account and the Working Safer levies as business expenses, as far as I know the Earner's levy is a private expense. I'm wanting to double check that I'm doing it right and not missing out on being able to claim my Earner's levy as a business expense. That is all I need to know and I've been going through IRD and ACC and other sites with resources like business.govt and Hnry and I can't find anything that explicitly clarifies this.

Thank you in advance! :)