20. Is there a limit on the amount a candidate can contribute to their own election campaign?

Regulation on Managing Campaign Finance during 2014 Presidential and Provincial Council Elections http://www.iec.org.af/pdf/legalframework/2013-regulations/eng/reg_on_managing_campaign_finances_eng.pdf

Article 77:
(1) The limits for expenses by the candidates of Presidential, Wolesi Jirga, Provincial Councils, District Council, Village Council, Mayoral and Municipality Councils elections shall be determined taking into consideration the number of the persons eligible to vote, area and geographical location of the relevant electoral constituency, in accordance with procedures enacted by the Commission.
Article 3:
Limits of electoral expenses during electoral campaigns are as follows:
1. 10000000 Afghani(around USD137000) for presidential candidates
2. 500000 Afghani for provincial council candidates