The highly-rated 20-year-old defender has only recently been recalled form a loan stint with Ipswich's Championship rivals Sheffield United because of a lack of game-time at Bramall Lane in the first half of the season, where he made 17 appearances.
And while it seemed he would be staying put with the north Londoners, boss Mauricio Pochettino has had a change of heart and agreed to send him to join up with Mick McCarthy's Portman Road outfit.
Carter-Vickers, who secured his United States international debut this season, is now looking forward to getting some more experience in a competitive league.
He told the Ipswich website: "I didn't expect to be called back. I thought I would be at Sheffield for the season, but then I got told Ipswich wanted me.
"It's all happened very quickly, but I know Ipswich are a big club and it's an exciting opportunity for me.
"I looked at the Championship table and Ipswich are only four points off the play-offs so hopefully I can help the team push on and compete for the top six places.
"I've really enjoyed Championship football. It's a demanding league and there are a lot of big clubs in the division. Ipswich are one of them and I'm thankful for the chance to come and play here."