41. Are there limits on the amount a candidate can spend?

No candidate may spend more than TOP $10,000 during, or 6 months before or after, any election campaign (US$4,556.50). The definition of campaign expendiure  includes the cost of entertaining (including food and drink) and the cost of transporting people to a polling station. 

Source: Section 24: Permitted Election Expenses, Electoral Act 1989.

Limit on candidate expenditure is the only regulation of campaign financing that exists in Tonga.