I really enjoy my job.
I've been there for a while and have had a significant increase in responsibility both in terms of work load, direct reports and also contributed to top line revenue growth and bottom line improvement.
How do you ask for a salary increase?
My boss knows my achievements. I hate asking he has been promising an increase for about 18 months.
I've never had to ask for increases before.
So what is asking going to achieve?
If you're determined to 'ask'
You could request a meeting, and in that meeting raise that in the last 18 months you have had no performance based salary increase, despite the promises. In that 18 months you detail the additional tasks, responsibilities and revenue benefits you have produced.
Provide evidence of similar roles elsewhere and their current salary expectations and how your current salary appears to be not keeping up with current market rates.
You need to realise that a 'no' could easily be the result of this meeting though.
Alternatively,
Look for jobs elsewhere and either utilise as evidence of an offer elsewhere or change jobs.