A valid protest letter must be , and contain specific information. Below is a detailed breakdown.

Please find attached [list the supporting documents].

Attention: [Name of Regional Director/Assistant Commissioner][Office Address of Revenue Region/Service that issued the notice]

Include the date of the assessment notice and the specific notice number (e.g., Final Assessment Notice or FAN).

The assessment is void and should be cancelled because:

Date: [Date of writing, e.g., October 20, 2023]

The "sample protest letter tax assessment Philippines" provided above is a powerful tool only if used correctly and promptly. Tax assessments by the BIR are not infallible. The law gives you a clear, structured path to question errors, miscalculations, or violations of due process.