41 CFR § 304-3.3
May my agency or I accept payment for travel expenses to a meeting from a non-Federal source?
June 9, 2020
Yes, you or your agency may accept such a payment from a non-Federal source, but you may only accept when your agency specifically authorizes such acceptance under the requirements of this part. Except as provided in §304-3.13 of this part, your agency must approve acceptance of such payment in advance of your travel.