If the client I puts me money on account, part of which goes to pay for his advertising in Google.ADS and/or Yandex.Direct.
As it is designated in the application for self-employed?
Does not designate. You may not apply to NAPs - article 4 paragraph 2 of the Law
2. Not entitled to apply special tax regime:
5) the persons carrying out entrepreneurial activities in the interests of another person on the basis of contracts of assignment, contracts of Commission or Agency contracts if other is not stipulated by paragraph 6 of this part;