Tax Filing and Compliance — Belgium

Traditional paper returns due June 30. Rarely used anymore. Most taxpayers file electronically for convenience and extended deadline.

Electronic filing through Tax-on-web portal extends deadline to July 15. Recommended method. User-friendly interface. Pre-filled data from employers, banks.

Self-employment income, foreign income, or filing through tax advisor: deadline October 16. Automatic extension for complex situations. Must meet complexity criteria.

Many employees receive proposed simplified return showing pre-calculated tax. If correct and no additional deductions to claim, can simply accept. No formal filing needed. But can file to claim refunds.

Self-employed, rental income, foreign income, capital gains (if taxable), or claiming deductions must file full return. Cannot use simplified return.

Even if not required, can file to claim deductions, refunds, or correct errors. Often worth filing to optimize tax through deductions.

Annual salary statement (fiche 281.10) from employer. Shows gross pay, taxes withheld, social contributions. Electronically transmitted to tax office.

Statements showing dividends received, interest earned, securities sold. Belgian institutions automatically withhold tax and report to authorities.

Pension savings certificates, mortgage interest statements, childcare receipts, donation receipts. Must keep 7 years. Tax office may request during audit.

Foreign salary, investment income, property ownership must be declared. Bank statements, foreign tax certificates. Residents taxed on worldwide income.

Official notice from tax authority showing final calculation. Usually received 6-12 months after filing. Shows tax due or refund. Can appeal within 6 months if disagree.

If tax owed, must pay within 2 months of assessment notice. If refund due, typically paid within 2-3 months. Refunds for year N usually received during year N+1.

Can make voluntary advance payments during year to reduce final tax bill and avoid interest. Required for self-employed. 10% interest penalty if pay less than 90% of due tax.