35. Are there provisions for any other form of indirect public funding?

61. [...]Political parties may generate the following revenues:

a) An admission fee and a membership to be collected from members,

b) Deputy fees from each deputy of the party,

c) (Amended by Article 6 of Law 3420, dated 31 March 1988) Special membership fees to be collected from pre-candidates running for deputyship, mayorship, municipal council membership, and general provincial council membership, (These membership fees shall be determined and collected by the authorized central decision-making organs of political parties in accordance with the principles listed in article 64.)

d) Revenues generated from the sale of party flags, pins, badges and similar symbols,

e) Revenues generated from the sale of party publications,

f) Money to be collected in return for the provision of membership ID cards, party books, invoices and papers,

g) Revenue generated from balls, entertainment activities and concerts organized by the party,

h) Revenue generated from the party’s assets,

i) Donations

j) (Annex by Article 1 of Law 3032, dated 27 June 1984) Benefits provided by the state.

With the exception of revenue generated from the party’s assets as written in paragraph (h), the revenue generated from the sources listed in the other paragraphs shall not be subject to any taxes, duties or charges whatsoever.
Source: Article 61, Law on Political Parties, 1983 (amended 2018)

Such that no fees can be charged for billboards and advertising spaces which are allocated upon request free of charge outside the election period. These spaces are allocated equally among political parties and independent candidates.
Source: Article 60(5), Law on Basic Provisions of Elections and Voter Registers, 1961 (amended 2018).

Citizens may hang or stick promotional materials such as flags, posters or posters belonging to parties or candidates on their homes, premises or vehicles from the thirtieth day prior to the day of voting until the end of propaganda period. These advertisements and advertisements are exempt from all taxes and fees.
Source: Article 60(13), Law on Basic Provisions of Elections and Voter Registers, 1961 (amended 2018)

Tax relief for political parties and advertising space for political parties (including candidates from parties' lists) and independent candidates. This include all types of elections.