In addition you get a 'loyalty bonus' of 5% of basic after 2 years, 10% after 5 years and 15% after 10 years. Those years are backdated to the day you join as an SO, so if it took you 8 years to become a Captain you would kick in straight away to the 10% loyalty bonus.
AdM, correct me if I'm wrong, but hasn't the loyalty bonus has been removed for NEC Co-Pilots and been replaced by a performance bonus of up to 5% after 3 years? You then begin accruing "loyalty" based on your time in the left seat, that's to say, no 5% loyalty until after 2 years as Captain.