Hamilton Academical have been issued with a "season-long transfer embargo" by the SPFL after the League 1 club failed "to settle its tax obligations".
The club was already subject to a ban on registering new players "following remuneration and tax defaults which were determined or admitted during season 2024-25".
A 15-point deduction last season led to Accies finishing bottom of the Championship and automatic relegation.
"Hamilton Academical FC admitted to further breaches of SPFL rules by failing to settle its tax obligations to HMRC on three occasions, and for failing to notify the SPFL that it had been in default of its tax obligations to HMRC on each occasion," the SPFL said.
The SPFL say the embargo will be lifted at the end of the 2025-26 season and have also imposed a £7,500 fine, £5,000 of which is suspended.