18. Is there a limit on the amount a donor can contribute to a candidate?

A political entity may raise funds from private sources for election campaign expenditure. Natural and legal persons may give donations in a single calendar year in which elections are held, in addition to donations for regular work, also for election campaign expenditure up to maximum stipulated amount at annual level specified in article 10, paragraphs 1 and 2 hereof, regardless of the number of election campaigns in a calendar year. For financing election campaign expenditure a political entity may also use funds from credits and loans." 
Source; Article 22. Law on financing political activities.

10 average monthly salaries for natural persons, 30 average monthly salaries for legal persons, regardless of the number of election campaigns in a calendar year.