The Costa Rican Income Tax Law only allows two methods:
b) sum-of-the- years´digits.
In the Regulation to the Law, there is a chart for each of the assets. In case an asset is not included in the chart, it must be requested to the Tax Authority (Dirección General de Tributación)
By provisions established by the National Supervisory Board of the Financial System (CONASSIF), investments are valued at market value, which can result in profits or losses in their valuation. Yields are subject to 8% tax, withholding at the source.