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

The maximum limit of  candidates' and registered candidates' election fund assets should not exceed 500 thousand manats (during Elections to the Milli Majlis) Source: Article 156.1. , Election Code of the Republic of Azerbaijan, 2003 (amended 2018).

The maximum limit of the election fund of a presidential candidate may not be more than 10 million manats. (for presidential candidates)

Source: Article 191.1. , Election Code of the Republic of Azerbaijan, 2003 (amended 2018).

Special funds - these special funds for presidential candidates nominated by political parties or blocs of political parties shall be formed from the funds contributed by political parties or blocs of political parties of presidential candidates, under the condition they not be more than 250 thousand manats;  [...]

Source: Article 191.2.1. , Election Code of the Republic of Azerbaijan, 2003 (amended 2018).

Election Code does not specify a threshold for the donation from candidates to their own campaign. However,   the maximum limit of  candidates' and registered candidates' election fund assets should not exceed 500 thousand manats during Elections to the Milli Majlis (Article 156.1. , Election Code of the Republic of Azerbaijan, 2003 (amended 2018).

In presidential elections, the maximum limit of the election fund of a presidential candidate may not be more than 10 million manats. (Article 191.1. , Election Code of the Republic of Azerbaijan, 2003 (amended 2018). 

Special funds  for presidential candidates nominated by political parties or blocs of political parties shall be [...] not be more than 250 thousand manats;  [...] (Article 191.2.1 , Election Code of the Republic of Azerbaijan, 2003 (amended 2018).

It can be considered that individual candidates may contribute to their elections funds without a special limit yet the total fund shall not exceed the prescribed upper limits.