The deadline for filing imputed income (not rented property) is generally
December 31st of the following year. For example the form (Modelo 210) for 2023 must be filed before
December 31, 2024. Rental income must be filed on a quarterly basis, within the first 20 days of the
next quarter (April, July, October, and January). For example for the first quarter the report must
be filed until April 20th.