If you were notified about a tax-related message, it is probably about a due date approaching. You do not need to take any action if you have paid your taxes or if you are going to pay them by their due dates.
Data format specifications
Tax Administration's Data Format Specifications
- Data format specifications - Annual information returns
- Data format specifications - Return for self-assessed taxes
- Data format specifications - VAT EU Recapitulative Statements
- Data format specifications - Income Tax Returns
- Data format specifications - Direct transfers of data
- Data format specifications - Other filings
- Data format specifications - Reporting construction-sector details
- Data format specifications - Individual Tax Numbers
- Data format specifications - Flows containing data requests and answer files
The Sample files page contains examples of file contents.