The appraisal system in our company is going to change next year. In the old system, if you make promotion to another function (e.g. from junior to mid-level) you get a standard raise of 3%. In the new system, this raise depends on your relative salary compared to the maximum salary for the new function. This new raise is at least 3%, but can be as big as 10%.
I'm not yet sure I will get a promotion this year, however, it might happen. If I get it this year, this would mean I get a 3% raise (from the old system), while next year I would get an 8% raise for a promotion.
Over a ten year period, this amounts to a difference of 12k€ that I would get more if I get my promotion next year. Therefore, I was thinking about the consequences of declining a potential promotion this year. I do understand that decline the potential promotion this year gives no guarantee that I will get it next year.
What is the best way to approach this situation?