Mr McWilliams — one of the country’s leading economic commentators — has chronicled Ireland’s boom and bust over the past 15 years.
The Dubliner has also been busy building up his brand both here and across the globe.
New figures show that it continues to pay off with accumulated profits at his Iconic Media Ltd last year increasing by €254,191 to €884,037.
The accounts show that at the end of last March, the firm had financial assets totalling €1.16m.
The profit increase is substantially more that the firm posted in 2014.
Mr McWilliams — who appeared at the Oireachtas banking inquiry last year— generates his income from writings, including regular columns at two national newspapers, and speaking engagements where he counts Google, Ericsson, and Sony amongst his clients.
Last year, Trinity College Dublin announced that McWilliams would be joining the faculty as a professor to teach an executive MBA course on global economics at the TCD Business School.
The bestselling author of four books has been busy teaching through his website where the Trinity graduate offers an online lecture economics course ‘Economy without Boundaries’.
It costs €224.
The author also published a daily economics and business bulletin.
Mr McWilliams’ wife, Sian Smyth, is a director on Iconic Media Ltd.
Incorporated in 1999, the firm has two people on the payroll and total employee costs increased last year by €5,000 to €60,000.
Under the heading of directors’ transactions, the accounts show that in 2015, €282,117 was repayable to Mr McWilliams.
The firm’s cash pile increased from zero to €40,519 last year.