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

The sources of funding of the election campaign of a single candidate include:
1) donations made on the terms and conditions laid down in this Act;
2) personal property of the single candidate.
Source: § 5.2(3), Political Parties Act, 1994 (amended 2014)

A political party is allowed to accept cash donations from a natural person to the extent of up to 1200 euros per financial year. Cash donations are immediately registered by a political party as revenue.
Source: § 12.3(3), Political Parties Act, 1994 (amended 2014)

There is the limit of the cash donations, but candidate can use also personal property without limitation.