It's definitely true that it's much harder to get a significant raise than to switch to a job that pays more…unless you get a promotion, and even that can be tough. So, do you think that, say, a 10% raise would satisfy you? If you're anticipating more than that, and you aren't up for promotion, then I would consider looking elsewhere. I know that if I had that raise conversation with my boss, his response would be about the same – “I'll see what I can get for you”, and that would be the end of things. Even a 10% raise is pretty hefty if they don't feel that the credential is required, so if you're looking for much more than that, I would consider looking elsewhere. I'm going to be looking for probably 50% at least, and I'll discuss it with my boss, but I anticipate that his response will be more along the lines of “hell no” than any sort of agreement! 😛
As for the industry guidelines, I would suggest looking at this site: https://quickfacts.census.gov/qfd/states/00000.html Select your state and then your city/county and find the line “Per capita money income in the past 12 months (2011 dollars), 2007-2011”. Divide that number by the national number ($27,915) to see what the average wage comparison is for your locality vs the nation, then multiply the industry standards by that percentage, just to get a rough idea of a more local estimate. For example, in my area, the regional wages are approx 60% of national wages. So, a position that's $45-65k as a nationwide average would be about $27-39k locally. The reason I mention all of this is that it could be that you're not as underpaid as the national figures indicate…or it could be that you're worse! Of course this isn't a precise thing – you'd have to have the average accounting wages for your area to really know anything specific, but it can help to get a more accurate comparison! Because I know that if my local average for a $50k job is $30k, then in principal, someone has a $70k average to even things out!