Does owing the ATO affect your credit score?

The Australian Tax Office generally doesnt report an outstanding debt to credit reporting agencies unless the debt and business meet certain criteria. As such, the criteria noted by the tax office are:

• You have an ABN and are not an excluded entity. As such, excluded entities include supperannuation funds, charities and gift recipients.
• You have one or more debts to the ATO totalling greater than $100,000 and more than 90 days overdue.
• You are not in communication with the ATO about your tax debt.
• You dont have an active complaint with the inpector general.

See the ATO for more details – https://www.ato.gov.au/individuals-and-families/paying-the-ato/if-you-don-t-pay/disclosure-of-business-tax-debts

Otherwise, assess your consolidation options with a Debt Consolidation Calculator