Depends on the position, but many positions have a career track. Revenue agents have a 5/7/9/11 career track (corresponds to GS-5/GS-7/GS-9/GS-11). You'll get promoted to the next grade as long as you spend a year in your current grade and are rated fully successful by your manager (not really that hard to achieve). GS-12 and above positions must be applied for, and they are competitive with interviews.
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