In my opinion there are several factors that come in to play:
-Is your current salary (or current salary +8%) reasonable for your current roles and responsibilities? In other words, if you are earning close to what other individuals in the organisation doing the same/similar role (or market rates) then 8% is a decent increase; if you are massively underpaid relative to your peers, then perhaps not.
-Other than 'doing a great job' what have you done above and beyond the remit of your role as agreed when you took it i.e. things you can point to to suggest that you merit a larger increase. If you are simply doing what you were hired to do (albeit to a high standard), then I think a double-digit percentage increase is unlikely.
-How is the organisation doing, both as a whole and your division/sector/department? Has it been a profitable year with plenty of cash floating around for pay rises?
-Is there anything quantifiable you can point to in terms of value you've brought to the organisation e.g. explain how over the past year you have generated or contributed significantly towards $xxxxxx of revenue?
I've been in a similar position in the past in that I was offered (given) a 5% pay rise and wasn't happy with it because I was earning significantly less than other people in the same role (and had taken on additional responsibilities since joining). I tried negotiating without immediate success but I did get promoted less than 6 months later (with a proper payrise) so at least it was sewing the seeds in my manager's mind in terms of my ambition and abilities.
-Is your current salary (or current salary +8%) reasonable for your current roles and responsibilities? In other words, if you are earning close to what other individuals in the organisation doing the same/similar role (or market rates) then 8% is a decent increase; if you are massively underpaid relative to your peers, then perhaps not.
-Other than 'doing a great job' what have you done above and beyond the remit of your role as agreed when you took it i.e. things you can point to to suggest that you merit a larger increase. If you are simply doing what you were hired to do (albeit to a high standard), then I think a double-digit percentage increase is unlikely.
-How is the organisation doing, both as a whole and your division/sector/department? Has it been a profitable year with plenty of cash floating around for pay rises?
-Is there anything quantifiable you can point to in terms of value you've brought to the organisation e.g. explain how over the past year you have generated or contributed significantly towards $xxxxxx of revenue?
I've been in a similar position in the past in that I was offered (given) a 5% pay rise and wasn't happy with it because I was earning significantly less than other people in the same role (and had taken on additional responsibilities since joining). I tried negotiating without immediate success but I did get promoted less than 6 months later (with a proper payrise) so at least it was sewing the seeds in my manager's mind in terms of my ambition and abilities.