In 2002, MacIntosh was cast as Dr Charlotte Beaumont in the medical drama All Saints.[5] MacIntosh took the role of Charlotte as she saw the character as a new challenge. She was initially contracted for six weeks.[5] Of Charlotte, MacIntosh commented "she's been empowering to play. I felt much stronger and more confident in who I was than I had in a long time."[5] MacIntosh became one of the show's longest serving cast members joining in series 5 and staying until its final season went to air.[5]
She had a recurring role on Sea Patrol portraying Commander Maxine "Knocker" White. She also played Doctor Elizabeth "Mac" Macmillan in ABC's crime drama Miss Fisher's Murder Mysteries,[6] and Doctor Amelia Ward in "Episode 9" of Crownies.
Tammy would exit Wentworth in series 7 as the show begun to take a toll on her. Macintosh revealed the extent of filming would leave her 'crying while going on walks' and she would facetime her son every night during production.[9] Tammy spoke with the production team at the end of series six to inform them that the upcoming seventh season would be her last as Kaz. During series seven Kaz dies in the fourth episode of season 7 in a horrific killing.
Macintosh would join several of her co-stars from Wentworth during 2022 and appeared at both a Screen Star Event in London and Birmingham and would also appear at the Wentworth Con fan convention in Melbourne. Macintosh appears regularly at these fan conventions.[10]