The company's surge in profits follows its acquisition of Rubicon for £60m in August 2008.
The Irn-Bru brand is reported to have lifted company revenue by 8% after AG Barr invested £15m in a national marketing campaign for the drink, mostly focused on the north of England.
Sales of the Rubicon range rose by 37% due to AG Barr's marketing agenda earlier this year. Revenue for the first half of this year has risen from £105m to £119m.
Roger White, AG Barr chief executive, said: "We have achieved sales growth well in advance of the market for our core brands and during the period have further increased our marketing investment.
"We are up against tougher comparatives in the second half of the year but, while we remain cautious regarding the overall economic and consumer outlook, we believe we are well positioned to meet our expectations for the full year."
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