Black Sabbath began work on their sixth album in February 1975, again in England at Morgan Studios in Willesden, London. The title Sabotage was chosen because the band were at the time being sued by their former management and felt they were being "sabotaged all the way along the line and getting punched from all sides", according to Iommi. "It was probably the only album ever made with lawyers in the studio," said drummer Bill Ward. Iommi credits those legal troubles for the album's angry, heavier sound.
In 2001, bassist Geezer Butler explained to Dan Epstein, "Around the time of Sabbath Bloody Sabbath, we found out that we were being ripped off by our management and our record company. So, much of the time, when we weren't onstage or in the studio, we were in lawyer's offices trying to get out of all our contracts. We were literally in the studio, trying to record, and we'd be signing all these affidavits and everything. That's why it's called Sabotage – because we felt that the whole process was just being totally sabotaged by all these people ripping us off." In his autobiography I Am Ozzy, singer Ozzy Osbourne confirms that "writs were being delivered to us at the mixing desk" and that Ward "was manning the phones". In the liner notes to the 1998 live album Reunion, Butler claimed the band suffered through 10 months of legal cases and admitted, "Music became irrelevant to me. It was a relief just to write a song."
Iommi later reflected, "We could've continued and gone on and on, getting more technical, using orchestras and everything else which we didn't particularly want to. We took a look at ourselves, and we wanted to do a rock album – Sabbath Bloody Sabbath wasn't a rock album, really." According to the book How Black Was Our Sabbath, "The recording sessions would usually carry on into the middle of the night. Tony Iommi was working really hard on the production side of things with the band's co-producer Mike Butcher, and he was spending a lot of time working out his guitar sounds. Bill, too, was experimenting with the drums, especially favouring the 'backwards cymbal' effect." Osbourne, however, grew frustrated with how long Black Sabbath albums were taking to record, writing in his autobiography, "Sabotage took about four thousand years."
According to Iommi, the Sabotage sessions were the scene of a legendary jam session between Black Sabbath and Led Zeppelin. Iommi's recollection may be inaccurate, however, as records show that Zeppelin were on tour in the US at the time Sabotage was being recorded. Ward's recollection of the exact timing of the Zeppelin jam session is also fuzzy. "I don't even know what album we were working on", the drummer explained. "But one of John (Bonham)'s favourite songs was 'Supernaut' – so, when they came down to the studio, he wanted to jam 'Supernaut'."