For advice that you can rely on, you'll need to take the retirement plan description to an attorney in your area.  There are other facts that he or she will want to know as well.  One place to find a qualified lawyer is our website:  http://attorneypages.comOne of the things that might matter is if the salary reduction was "officially" just temporary.  But I very much doubt that, if your pension is reduced because of that reduction, having the old rates reinstated after you retire would benefit you at all.