Almost 300,000 adoring fans at The Script concerts last year contributed to the cash pile at band members' firms topping €3.4m.
New accounts filed by band members' companies in the UK show that the combined accumulated profits totalled €2.64m at the end of April this year.
According to trade industry journal, Pollstar, the Dublin band - led by 34-year old Danny O'Donoghue - generated box office receipts of $15.1m (€11.1m) last year with a total of 294,404 fans paying to see the group at 28 concerts in 23 cities that included three sold-out gigs at Dublin's O2.
The Script - ranked 97 in the top 100 grossing tours for 2013 - generated box office receipts of $656,522 per gig.
The band further added to its coffers earlier this year by staging a five-week 18-date tour in the US in May and June and has already sold out Croke Park for next June.
They are only the third Irish act to headline Croke Park after U2 and Westlife and recently released their fourth album, No Sound Without Silence.
The accounts lodged by the band's Madnotes Publishing Ltd show that the firm's accumulated profits increased by £180,000 (€227,000) from £1.004m to £1.184m in the 12 months to the end of April last year with the firm's cash pile declining from £2m to £1.4m (€1.8m)
The firm generates its revenues from publishing royalties.
Separate figures for Madnotes Entertainment Ltd show that the firm's profits dipped from £1.178m to £933,928 during the year with the firm's cash pile decreasing from £1.7m to £1.33m (€1.6m).
The revenues from this firm are generated from recording, royalties and touring.
The accounts disclose that Danny O'Donoghue repaid an outstanding balance of £266,035 back to the company during the year with Mark Sheehan repaying £234,707 to the firm.
The directors and shareholders of the two firms are the founding members of The Script, Danny O'Donoghue and Mark Sheehan.
The accounts for the two firms are abridged and the firms are not required to provide a revenue figure and how much it paid its directors or staff in the year.