How is the Account Standing score calculated?

The Account Standing Score is calculated by surveying official IRS records and is a weighted ratio of timely filing and paying compliance records both currently and historically, current audits in process measured by number of years, stages of completion and dollar amount together with amounts due in the IRS Collection Division, by dollar amount, age, type of tax, missing returns and resolution status. Scores 90-100 are in good standing, 70-89 are not in good standing with risk of liens and levies, and 60-69 are not in good standing with imminent risk of liens and levies.