After the election, the candidate must provide a written statement of their personal expenses to their agent within 21 days of the result being declared.1
The agent must meet deadlines for:
receiving and paying invoices
sending a spending and donations return to the Returning Officer
Both the agent and the candidate must also submit declarations that the return is complete and accurate.2
You must still submit a return and declarations even if you haven’t spent any money.3
This is called a ‘nil return’.
You can find these deadlines, and more information on reporting, in After the election.