Well so far (to my reckoning anyway) DOGE has self-limited itself to Cabinet agencies, those under the Executive Branch. Anything under the Executive Branch (i.e., the President) can be audited and personnel terminated at the President's pleasure. The IRS and Treasury, however, although they too fall under the Executive Branch, were created by Congress, and it would take Congressional action to eliminate them. At least that's how I understand the Constitutional basis of our government.