If, at the time of sale, it is already clear that the primary residence will be changed, the seller is granted a reasonable period to establish a new primary residence. This period is determined on a case-by-case basis. If the acquisition of the new primary residence takes longer, this period may exceed one year.
VwGH 22.02.2024, Ra 2022/13/0091 in conjunction with § 30 para. 2 item 1 EStG 1988