39. Are there limits on the amount a political party can spend?

Source: 

Article 15.10*, BiH Election Law 2001, consolidated version (with 2024 amendments)

(BS)

U roku od sedam dana od zaključivanja Centralnog biračkog spiska, Centralna izborna komisija BiH objavljuje broj birača za svaku izbornu jedinicu. Taj broj je osnov za određivanje maksimalnog iznosa sredstava koji politički subjekt može potrošiti za finansiranje izborne kampanje. Maksimalno dozvoljeni iznos za finansiranje troškova izborne kampanje za izbore izračunava se tako da se broj birača u svim izbornim jedinicama u kojima politički subjekt iz stava (1) ovog člana ima kandidatsku listu ili kandidata pomnoži sa: 1) 30 feninga za izbore za načelnika opštine /gradonačelnika i za članove opštinskog vijeća/ skupštine opštine 2) 20 feninga za izbore za članove kantonalnih skupština 3) 30 feninga za izbore za članove Narodne skupštine RS i Predstavničkog doma Parlamenta Federacije BiH 4) 30 feninga za izbore za članova Parlamentarne skupštine BiH 5) 30 feninga za izbore za članove Predsjedništva BiH 6) 30 feninga za izbore za predsjednika i potpredsjednike RS. U slučaju ponavljanja izbora u izbornoj jedinici, odnosno biračkom mjestu troškovi izborne kampanje po biraču mogu iznositi do 30% troškova poništenih izbora u izbornoj jedinici odnosno biračkom mjestu.

(EN)

Within seven days from the finalization of the Central Voters’ Register, the Central Election Commission of BiH shall publish the number of voters for each electoral unit. This number serves as the basis for determining the maximum amount of funds that a political entity may spend on financing the election campaign.
The maximum permitted amount for financing election campaign expenses is calculated by multiplying the number of voters in all electoral units in which the political entity referred to in paragraph (1) of this Article has a candidate list or candidate, by:
0.30 BAM (30 fening) for elections for municipal mayors and members of municipal councils/assemblies,
0.20 BAM (20 fening) for elections for members of cantonal assemblies,
0.30 BAM (30 fening) for elections for members of the National Assembly of RS and the House of Representatives of the Parliament of the Federation of BiH,
0.30 BAM (30 fening) for elections for members of the Parliamentary Assembly of BiH,
0.30 BAM (30 fening) for elections for members of the Presidency of BiH,
0.30 BAM (30 fening) for elections for the president and vice presidents of RS.
For elections referred to in paragraph (2), item 1 of this Article, in municipalities where the number of voters entered in the Central Voters’ Register is less than 3,000, it shall be considered that 3,000 voters are registered.
In the case of repeat elections in an electoral unit or polling station, election campaign expenses per voter may amount to up to 30% of the expenses of the annulled elections in that electoral unit or polling station.

Available at: 

https://advokat-prnjavorac.com/zakoni/Izborni_zakon_BiH.pdf

The total campaign spending limit is calculated by multiplying the number of registered voters in all electoral units where a party or candidate is running by a fixed amount per voter, which varies by election type, for example, 0.30 BAM per voter for municipal, entity, and state-level elections, and 0.20 BAM per voter for cantonal elections.
In municipalities with fewer than 3,000 registered voters, the calculation assumes a minimum of 3,000 voters to ensure a baseline spending limit. For repeat elections, entities may spend up to 30% of the previous limit for the annulled elections in that unit.