Tahir burst into Warwickshire’s senior side in 2004 and was a key component of their bowling attack as they won the Frizzell County Championship without losing a game.
He took a wicket with his second ball in first class cricket, against Cambridge UCCE at Fenner's. He followed up with a match-winning eight-wicket haul - four in each innings - on his championship debut against Worcestershire at Edgbaston.
He finished the season with 26 championship wickets at an average of 29.46 and also proved his ability with the bat by hitting 49 against Worcestershire at Edgbaston, when he shared a 114-run seventh-wicket stand with Jim Troughton.
He spent the winter of 2004/05 in Perth, Australia, playing grade cricket and working with then Warwickshire coach John Inverarity but his intended 10-week stay was cut short by a back injury.
The same back injury delayed his start to the 2005 domestic season and he managed only four County Championship matches, taking 10 wickets.
He was named Warwickshire Under-15 youth player of the year in 1999 and when he stepped up to Under-19 level he was named players’ player of the year and player of the year.
He took 25 championship wickets in the summer of 2007, making him his side's second leading wicket-taker in the competition.
However, he played just four games in 2008 in each of the championship and limited-overs format, as he struggled to maintain a place in the side.