🇫🇷 COUNTRY A France VS 🇧🇪 COUNTRY B Belgium

It depends on income composition. For employment income: France's 45% + CSG/CRDS 9.7% = ~54.7% combined makes France modestly higher than Belgium's 50% + 7% commune (~53.5%). For investment income: France has the Prélèvement Forfaitaire Unique (PFU) flat tax of 30% on dividends and interest — competitive vs Belgium's 30% withholding on dividends (précompte mobilier). For long-term savings: France's assurance-vie with 7.5% after 8 years is better than anything Belgium offers. For real estate wealth: France's IFI bites on portfolios above €1.3M; Belgium has no equivalent real estate wealth tax. For social benefits: both countries have comprehensive healthcare; France's system is generally considered more generous but both are high quality.

The Belgium-France Double Tax Agreement (1964, with subsequent protocols) contains a specific frontier worker article. Workers living in Belgium who work in France within the 'zone frontalière' (border zone — defined as communes within 20km of the border) are taxed only in France on their employment income, not in Belgium. Approximately 80,000+ Belgians commute to France for work — many in the Lille/Nord-Pas-de-Calais region. For these workers: (1) French income tax and CSG/CRDS apply to all employment income. (2) Belgian commune taxes do not apply to the French employment income. (3) Belgian income (if any) is reported in Belgium. The reverse also applies: French residents working in Belgium near the border are taxed only in Belgium. Important: the frontier worker regime does not apply to workers who telework primarily from their home country — post-COVID working patterns have complicated this significantly. Belgian authorities have clarified that >25% telework days may disqualify frontier worker status.

France wins for long-term investors through the assurance-vie regime. An assurance-vie contract is a life insurance wrapper: contributions are after-tax. After holding for 8 years, withdrawals are subject to only 7.5% flat tax (on the gain element) up to €4,600 single / €9,200 couple annual gain allowance, then 7.5% above that. This compares to France's standard PFU of 30% on investment income outside assurance-vie. Belgium has no equivalent: Belgian investment income (dividends) faces 30% précompte mobilier withholding; capital gains on shares are generally exempt (except for 'speculative' gains — subject to ordinary income tax rates). Net result: for a French resident with €500,000 in an assurance-vie generating 5% annually: after 8 years, withdrawals taxed at 7.5% rather than 30%. For a Belgian investor: 30% withholding on dividends, 0% CGT. For accumulating investors preferring CGT over income: Belgium's CGT exemption is attractive. For income-taking investors: France's assurance-vie is superior.