A Dublin-based company director topped the list, owing Revenue €5.8m.
John Milton, of 3 Garville Place, Garville Avenue, Rathgar was found to owe €2.4m in unpaid tax, along with €2.68m in interest and €720,860 in penalties.
The case arises following a Revenue audit and relates to the under-declaration of income tax.
None of the money due had been paid by 31 December 2020.
Gaboto Limited, a Dublin-based fuel retailer and wholesaler, located at Trinity House, Charleston Road, Ranelagh is also named on the latest defaulters list.
A Revenue investigation found that the company did not declare excise duty and under-declared VAT, and owed Revenue €4.34m in unpaid tax, interest and penalties.