I'm going to do the math below, but your employer very likely isn't billing highly enough.

Most employees top out billing 80% of time, so 32 hours. Assuming that, you're generating $5280 / week or $21,120 / month. Agencies need to be shooting to bill 3x of _actual_ hourly employee cost (this is target and I can elucidate if people are curious). Therefore your cost needs to be $7040 a month. 20% of your cost is wrapped up in health benefits, vacation time, and other perqs, so your hourly wage will be determined by that figure. Less the cost of perqs your hourly cost will need to be $5632 / month, or $35.20 per hour. That's a salary of about $70,400 per year assuming a 2000 hour year.