Before you frame this question, you should be aware that individual candidates are less important and parties are more important to campaign finance in most other countries. In the US, the various contenders for their party's nomination first fight each other for a year, and then the winner has tu build a coherent campaign for the general election out of the battlefield survivors. Elsewhere the first round is more internal to the party and thus cheaper.

In Germany, a candidate could donate to his or her own campaign, but that donation would fall under the usual campaign finance laws, which are mostly reporting requirements. Trying to spend on the campaign without donating it to the party would get the candidate and party into trouble for failing to report it.

Before you frame this question, you should be aware that individual candidates are less important and parties are more important to campaign finance in most other countries. In the US, the various contenders for their party's nomination first fight each other for a year, and then the winner has to build a coherent campaign for the general election out of the battlefield survivors. Elsewhere the first round is more internal to the party and thus cheaper.

In Germany, a candidate could donate to his or her own campaign, but that donation would fall under the usual campaign finance laws, which are mostly reporting requirements. Trying to spend on the campaign without donating it to the party would get the candidate and party into trouble for failing to report it.