Practical guide
Understanding debt-to-income check — sensitivity table
Everyday editorial team · GEOINNOVATION CO., LTD · Published · Updated
What this calculation is for
Debt-to-income ratio compares recurring debt obligations with gross monthly income. It is a useful screening measure before applying for financing, but it is not the same as a household cash budget. A lender can reject an application even when this ratio looks low.
How the method works
The housing payment, other counted monthly debts and proposed new debt are added and divided by gross monthly household income. The result is compared with the target percentage you enter. Different underwriting programs define counted debts and qualifying income differently.
A worked example
A $2,000 housing payment plus $500 of other debt against $8,000 gross monthly income produces 31.25% before another loan. Adding a $400 payment raises the ratio to 36.25%.
Assumptions and real-world differences
The target is user-selected, not an approval threshold promised by a lender. Credit history, reserves, employment, property costs and loan type are outside this calculation. Gross income must be positive, and annual income should be divided by 12 before entry.
Reading the gross monthly household income sensitivity table
The tool evaluates the same model across a range of gross monthly household income values while holding other assumptions constant. Choose a realistic low value, high value and number of points. Each row reports the same headline measure; the table is a set of conditional calculations, not a probability distribution or a forecast. Input-step rounding can make nearby rows equal.
Reproduce this tool’s example
These fixed example inputs are independent of edits you make above. Enter them in this tool to reproduce the result, then replace them with your own assumptions.
- Minimum gross monthly household income
- 5,000 $
- Maximum gross monthly household income
- 15,000 $
- Number of comparison points
- 5 points
- Proposed monthly housing payment
- 2,800 $
- Other monthly debt payments
- 850 $
- New monthly debt payment
- 250 $
- Target total DTI
- 36 %
Sensitivity analysis: 5 comparison points
Gross monthly household income ranges from $5,000 to $15,000.
- Gross monthly household income: $5,000: 78.0%
- Gross monthly household income: $7,500: 52.0%
- Gross monthly household income: $10,000: 39.0%
Frequently asked questions
- Should I use net income?
- This DTI tool uses gross monthly income. Use a separate budget to test actual take-home affordability.
- Are utilities counted as debt?
- Lender definitions vary; follow the applicable program rather than assuming every monthly bill is a debt obligation.
- Does the most favorable row show the most likely outcome?
- No. The table assigns no likelihood to any row. It shows how the result responds to the chosen assumption, and you remain responsible for selecting a plausible range.