EuroCalc

Qu'est-ce que le/la Ratio dette/revenu (DTI) ?

Le ratio dette/revenu mesure la part du revenu mensuel brut consacrée au remboursement des dettes et sert aux prêteurs à évaluer la soutenabilité du financement.

DTI captures the borrower's ability to service debt. Lenders distinguish front-end DTI (housing costs only — mortgage, taxes, insurance) from back-end DTI (all debt obligations including credit cards, car loans, student loans).

US conventional mortgages typically cap back-end DTI at 43%; FHA loans allow up to 50%. Swiss banks apply the 'tragbarkeit' rule: total housing cost (interest at a stressed 5%, amortisation, 1% maintenance) must stay below one-third of gross income — a stricter, stress-tested DTI.

Formule
DTI = Monthly Debt Payments ÷ Gross Monthly Income
Exemple

A household earning CHF 12,000 gross per month pays CHF 3,500 in mortgage, CHF 600 car loan and CHF 200 in other debt — back-end DTI is 4,300 ÷ 12,000 = 36%.

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Questions fréquentes

What DTI do lenders accept?+

Most US mortgages stop at 43%; Swiss banks at 33% on a stressed-rate basis. Lower is always better for pricing.

Does DTI use gross or net income?+

Gross income, before tax and social charges.

How can I lower DTI?+

Pay down credit cards, refinance high-rate debt, or extend loan terms.