13. Is there a ban on donations from any other source?

§ 5 and 6, para 3 of the Law on election Campaigns in the Slovak Reublic. Financing the Election Campaign for the President and independent Candidates of the Slovak Republic’s Election.  § 24, para 1 of the Law on Political Parties (85/2005 Coll. ACT from 4February 2005 on Political Parties andPolitical Movements)
 

a natural person who does not have permanent residence in the Slovak Republic.
legal person that has the registered office abroad.
foundations
etc.

(4) The presidential and independent candidate, political party may not accept a donation or any other gratuitous service for the election campaign from:
a) the state ,the National Property Fund of the Slovak Republic, the Slovak Land Fund, a municipality, or a superior territorial unit.
b) a legal person whose founder or promoter is the state, the National Property Fund of the Slovak Republic, the Slovak Land Fund, a municipality, or a superior  territorial unit.
c) a legal person with the capital participation of the state, the National Property Fund of the Slovak Republic, the Slovak Land Fund, a municipality, or a superior territorial unit.
d) a civic association, foundation, non-profit organization providing community services, a non-investment fund, an interest association of legal persons, associations of municipalities and organizations with an international element.
e) a public institution or a legal person  established by law.
f) a natural person who does not have permanent residence in the Slovak Republic.
g) legal person that has the registered office abroad.