A carer paid out almost €1.1m in tax, interest and penalties, according to the latest list of defaulters from the Revenue Commissioners.
A former tax inspector who was himself jailed for submitting incorrect income tax returns is also listed.
The latest haul from tax defaulters and other Revenue investigations during the first quarter of the year has yielded €107m for the Exchequer.
The carer - Michelle Forde of Ennafort Park in Raheny, Dublin 5 - was found to owe €375,000 in tax as a result of the non-declaration of capital acquisitions tax and income tax. She was charged €431,000 in interest and €281,000 in penalties.
It was the highest settlement on a list of defaulters that includes doctors, farmers, architects, and publicans.
Other significant settlements included €355,000 by solicitor Denis Molloy, of Bridge Street, Ballina, Co Mayo. His settlement resulted from a Revenue investigation case for the under-declaration of income tax and Vat. The settlement included €207,000 in tax, €89,000 in interest and €58,000 in penalties.
Dental technician Thomas Holland - of William Street, in Galway - settled for €311,000 after a Revenue case into the non-declaration of income tax and the under-declaration of PAYE, PRSI and USC. It included €155,000 in tax, €109,000 in interest, and €46,000 in penalties.
Kieran Sherry, a farmer with an address at Alkill House, Castleshane, in Co Monaghan, was hit with a €633,000 penalty by the courts for the non-declaration of income tax.
Earlier this year, a former Revenue Commissioners tax inspector received a two-year jail sentence for submitting an incorrect income tax return for 2005, and failing to deliver returns for 2006, 2007 and 2008.
James Daly, of Kinvara, Woodleigh Park, Model Farm Road, in Co Cork, pleaded guilty at the Dublin Circuit Criminal Court. He was working independently as a tax consultant and financial adviser.
The judge hearing the case said while Mr Daly had pleaded guilty, saving a trial, there had been an "absence of co-operation with Revenue" and there had been "no expression of remorse".
During the Revenue investigation, Mr Daly had a meeting scheduled with a Revenue tax inspector which he then cancelled by text.
He left the jurisdiction and a European arrest warrant was obtained to bring him back from Spain.
TLC Homecare and Healthcare Ltd, which is now in liquidation and based in Dooradoyle, Co Limerick, was hit with a €635,000 settlement for the under-declaration of Vat.
That included €383,000 in tax, €138,000 in interest, and €114,000 in penalties.
The company, whose directors are John Morris Gordon Luke and Therese Begley Luke, entered liquidation in 2018. It employed about 100 people and provided homecare, nursing and social care staff to University Hospital Limerick and other clients.
Sean McKeon, a builder of Drumna, Cloone, in Co Leitrim, made a €379,000 settlement relating to the under-declaration of Vat.
The Revenue Commissioners said that of the 35 settlement cases in the first quarter of the year the amount yielded was just over €6m.
In 12 of those cases, the amounts owed had not been fully paid at the end of March.