Private solicitors working for the Director of Public Prosecutions (DPP) were paid €6.47m last year.
According to figures released in response to a Freedom of Information Act request, the top-earning practice contracted to the State Solicitor Service last year, Barry Galvin's in Cork, received €453,778.
The overall total in fees was only a marginal increase on the €6.43m paid to state solicitors in 2012.
And it accounted for 17pc of the DPP's overall spend of €36.1m last year.
Fees to barristers amounted to €13m and accounted for 36pc of the DPP's spend, while 34pc went on salaries, wages and allowances.
The money paid to state solicitors is not a salary, but the fees include allowances for staff costs and premises as well as travel and subsistence.
Remuneration is divided into six bands to reflect the anticipated amount of work required in each geographical area.
Additional fees are paid in certain circumstances, including long-running trials.
As part of their contracts, state solicitors provide a 24-hour, 365-day-a-year service but are not entitled to a state pension.
The figures show that Limerick city state solicitor Michael Murray, who has spent much of his legal career bringing gangsters to justice, was paid €349,022 last year.
They also reveal that 13 solicitors received payments of between €200,000 and €250,000.
Thirty-two state solicitors are contracted to work for the DPP, with each one designated to a particular region and each contract lasting 10 years.