The Reading midfielder, 29, arrived on a month-long deal which was due to expire after Saturday's trip to Derby but he will now remain for the rest of the campaign.
Tabb is due to become a free agent in the summer when his contract at the Madejski Stadium expires and he has already expressed his desire to remain in Suffolk.
Boss Mick McCarthy told the club's official website: "I like him as a player. He's a real grafter, he's versatile and puts in a shift for me so I'm delighted that he's staying."
Meanwhile, McCarthy has also revealed David McGoldrick will make the final appearance of his loan spell this weekend before returning to parent club Nottingham Forest, although the striker is still scheduled to return to Portman Road on a permanent deal in the summer.
McGoldrick joined Town in January on a maximum 93-day loan, with a view to a summer switch, and that arrangement comes to an end after the trip to Pride Park.
"We've agreed to sign him in the summer, providing we stay in the Championship, and that will be done once he's sorted his contract with Forest at the end of the campaign," McCarthy added.
In other news, Ipswich have confirmed that youngsters Ronan Murray, Jack Ainsley, Joe Whight, Cormac Burke and Gunnar Thorsteinsson will all be released at the end of the season.