Football League Chairman Lord Mawhinney explained, "It is only right that we do not permit clubs that are unable to meet the costs associated with their existing playing staff to make further new player commitments."
Clubs have also agreed to give The League written permission to monitor, as appropriate, their tax affairs directly with HMRC, who have welcomed this new arrangement.
Lord Mawhinney said: "This new regime will provide us with an early warning system where clubs are facing financial problems. It should also help prevent HMRC debt reaching levels that otherwise could hinder the potential rescue of the club through a CVA.
"More importantly, football generally needs to develop a culture of paying its debts rather than putting them off for another day. This will help our clubs to become more financially sustainable in the longer term."
Clubs also approved a proposal from Derby County to increase the number of substitutes for Coca-Cola Football League matches to seven (from the current five), of which three may enter the field of play.