Luxembourg account of €280k — regularisation negotiated over 18 months
France–Luxembourg taxpayer, a savings account of €280k accumulated over 12 years (inheritance + expatriate salaries + interest), never reported on form 3916. Theoretical risk: 10 years of income-tax reassessment on the interest + 80% surcharge (French Tax Code 1729-0 A) + fines of €10k/year over 10 years (French Tax Code 1736 IV) ≈ €150k. Strategy: (1) voluntary regularisation organised by letter to the non-residents tax office, (2) filing of the 10 missing years of form 3916 + amended 2042 returns, (3) negotiation of the surcharge reduced to 40% instead of 80% for documented good faith. Final cost: ~€38k against ~€150k under an imposed audit.