The largest single settlement in the latest tax defaulters' list was for more than €2,354,000.
Company Director Anthony Dean - with an address at Woodhaven, Milltown Bridge, Milltown, Dublin 14 - paid over the amount to Revenue Commissioners for underdeclaration of income tax.
The settlement with Mr Dean was made as part of Revenue's Offshore Funds Investigation.
Another company - Tom Moran & Son Car Sales in Bannow, Co Wexford - settled for over €600,000 for underdeclaring VAT.
Meanwhile, based out of the Frankfort Building on Dundrum Road Dublin 14, business and management consultants Searing Insights settled for €584,271 after underdeclaring corporation tax, income tax, VAT and PAYE/PRSI.
In total, Revenue agreed €14.4m worth of settlements with tax defaulters in the first three months of the year.
For the first time in the latest List of Tax Defaulters, Revenue has also published details of unpaid settlements.
€4.1m worth of settlements for tax defaulting remained unpaid at the end of March.
The largest single outstanding amount on the list is €822,918 from an original settlement of €891,592, which is owed by McGee Service Station and & Oil Distribution Ltd, Moate Road, Kilbeggan, Co Westmeath.
An underdeclaration of VAT and PAYE/PRSI was discovered at the company following a Revenue audit.
The firm is in liquidation.
Separately, Cappawhite Plant Hire in Ballyhane, Cappawhite, Co Tipperary has paid just over €25,000 of a €555,439 settlement in relation to the declaration of VAT.
The company, which is also now in liquidation, was audited by Revenue.
Overall, at the end of March there were 29 tax default cases in which a settlement was not fully paid.