Record your situation before choosing a form

Tax preparation begins with facts about your income and circumstances. Make a list of employers, other income sources, relevant countries and the dates you lived or worked in each place. Residence status for immigration and classification for tax are different concepts. Do not decide your tax treatment only from the wording on a residence card.

The National Tax Agency publishes English guidance for foreign individuals, including material on resident classification, filing and supporting documents. Use the guidance for the relevant tax year. Annual rules, forms and available deductions can change, so a previous year’s checklist is a starting point for questions rather than a complete answer.

Collect documents throughout the year

Keep wage and withholding statements, records of other income and documents relating to deductions you intend to ask about. Label each file with the year and source. If an employer or payer issues a corrected statement, preserve the corrected version and note which document it replaces.

For overseas documents, record the currency, payment dates and the source of any conversion method you use. Ask the tax office or a qualified tax professional which treatment applies. Avoid relying on an online calculator that does not account for your full circumstances, and do not include private tax identifiers in a public discussion.

Resolve questions before the filing rush

Check whether year-end adjustment by an employer fully addresses your situation or whether a return may still be needed. Additional income, multiple payers and international circumstances can require closer review. Prepare specific questions and bring the records that show why the issue arises. Do not assume that a colleague’s filing position is identical to yours.

When using an official filing system, keep the submission confirmation and copies of what was sent. Record any payment or refund information separately. If you discover an error afterwards, use the official correction or consultation route. This guide helps organize records; it does not determine your tax liability. A well-kept folder allows the responsible office or adviser to assess the same evidence and reduces the chance that an important document is overlooked.