The Enfield-based printer, which was crowned PrintWeek Company of the Year in 2007, recorded sales of £4.3m in the period from July 2008 to June 2009, up from a total of £3.6m the same period a year previously.
Operating profit for the period was also up 49%, despite a significant spend in digital print technology at the beginning of the year.
Noel Warner, managing director at Inc Direct, said the past 12 months had been "very encouraging" for the company, especially in the current economic climate.
"We’ve seen a dramatic increase in our customer portfolio, along with a number of high-profile contract wins," he said.
Warner cited the renewal of a contract with The Carphone Warehouse, as well as the joint award of the print and fulfilment contact for insurance firm Esure, as the main factors behind its positive results.
"Strategy and consultancy, combined with strong marketing know-how, is where we have always clearly differentiated ourselves and has clearly been a key factor in our success over the years," he added.
Inc Direct records 21% growth in year-on-year sales
Inc Direct has cited a "dramatic" increase in the company's customer base as a key factor for its 21% growth in year-on-year sales.