Debt ratios can support planning only when the numerator and denominator are defined. NiyamFin's household measure is not the same as a lender's underwriting calculation.
Quick answer
For household planning, NiyamFin calculates:
Monthly debt payments ÷ monthly take-home income × 100
Its canonical planning bands are:
- Below 35%: lower debt burden
- 35–45% inclusive: watch debt burden
- Above 45%: higher debt burden
These are NiyamFin planning bands. They are not lender approval thresholds, regulatory limits, or universal borrowing rules.
DTI and FOIR are different concepts
NiyamFin's household DTI uses take-home income and recorded monthly debt payments. A lender's Fixed Obligation to Income Ratio (FOIR) is an underwriting concept. A lender may define eligible income, fixed obligations, existing EMIs, a proposed EMI, and household obligations differently by product and policy.
Lenders may apply their own FOIR or affordability criteria. A NiyamFin band cannot tell you whether an application will be approved, declined, or priced at a particular rate.
Illustrative scenario
Illustrative scenario: take-home income is ₹1,00,000 and recorded monthly debt payments are ₹40,000. NiyamFin's household DTI is 40%, which is in the 35–45% inclusive watch debt-burden band. This describes the recorded household cash-flow ratio only; it does not reproduce a lender's FOIR or predict an application result.
What the ratio leaves out
The ratio does not by itself capture essential expenses, emergency liquidity, income stability, dependants, rate-reset exposure, remaining tenure, or upcoming goals. Review those factors separately before testing additional borrowing.
Common mistakes
- Using gross salary when the planning method specifies take-home income.
- Treating DTI and FOIR as interchangeable.
- Reading a planning band as a lender decision.
- Ignoring obligations or relying on one ratio alone.
What to do next
Use the Debt-to-Income tool for the household ratio, then use Loan Reality Check or Home Affordability for a broader scenario. Obtain actual underwriting criteria from the lender.