40. If there are limits on the amount a political party can spend, what is the limit?

Source: 

Sections 3 (1)  and Section 3 (4), Regulation of Election Expenditure Act No. 3 of 2023

3. (1) Within a period of five days after the conclusion of the period of nomination specified in the Proclamation or Order requiring the conduct of an election under any law specified in section 2, the Election Commission shall, in consultation with the recognized political parties, and the independent groups contesting such election, fix by Order published in the Gazette, a sum of money in Sri Lankan rupees to be used for the purpose of calculating an authorized amount, in accordance with the provisions of this section, for such election: ...

(4) The authorized amount in relation to recognized political parties and independent groups shall be calculated by taking into consideration the sum of money referred to in subsection (1), the total number of registered voters in the local authority area or the administrative district or the electoral district or the electoral districts in the Island as the case may be, contested by each recognized political party or independent group at an election conducted under any law specified in section 2 and the number of candidates nominated by such recognized political party or independent group to contest such election.

https://www.parliament.lk/uploads/acts/gbills/english/6287.pdf 

This amount is not a fixed amount. The Election Commission of Sri Lanka collaborates with political parties to decide a per-voter rate, which needs to be done within  five days after the conclusion of the period of nomination. When deciding the "authorized amount, (1) the sum of money per-voter decided by the Commission, (2) the number of registered voters in the area the party is contesting (local authority, district, or entire country) and (3) the number of candidates the party is fielding in that election shall be considered.