Lesson 20 of 25 · 6 min
Debt-to-income across all obligations
Household debt-to-income is every claim on the month divided by the same gross income.
Debt-to-income is a capacity test that uses income as the denominator. Track 23 lesson 16 already split front-end from back-end on a housing file. This lesson puts every everyday claim into one numerator and divides by monthly gross. Track 9 lesson 1 is the method: two numbers, one comparison. Rules that govern how a lender counts the numerator vary; a reader's own situation belongs with a qualified professional.
Invented household. Monthly gross $5,420. Car $466.02 + housing principal-and-interest $1,986.45 + card minimum $215 + personal $95 = $2,762.47. Add one BNPL of $30 and the numerator is $2,792.47. DTI is $2,792.47 ÷ $5,420 = 51.5 percent. The $30 is lesson 11's small installment. Inside the sum it is not small. It is 30 of 2,792.47.
DTI = (sum of monthly obligations) ÷ monthly gross income
- monthly obligations
- Every claim that lands on the month as the file counts them: installments, minima, BNPL, housing PI.
- monthly gross income
- The denominator. Not take-home, not a collateral mark.
- DTI
- The ratio. On these figures, 51.5 percent.
The housing PI of $1,986.45 is Track 23 lesson 1's loan line, not the four-part PITI. The card $215 is a minimum, lesson 6's size, not a schedule that clears the card. Adding them is what the back-end already does. This lesson's move is to keep adding: the personal $95, the BNPL $30, anything else that is a claim on the same income. The test does not ask whether any one line is affordable. It asks whether the sum, as counted, fits the $5,420.
Capacity on income is one quotient. The numerator is every claim the file includes. How a lender counts those claims varies; a reader's own situation belongs with a qualified professional.
Key terms
- Household DTI
- The sum of monthly obligations divided by monthly gross income. A capacity test on income, not on collateral.
- Numerator stack
- Car, housing PI, card minimum, personal installment, BNPL — every claim that lands on the month as counted.
- Monthly gross
- The denominator. The test uses this figure, not take-home and not a house's mark.
Worked example
One income, every claim
Monthly gross $5,420. Car $466.02, housing PI $1,986.45, card minimum $215, personal $95, one BNPL $30. Invented household. Counting rules vary.
- Four-line sum
- $2,762.47
- Plus BNPL
- $2,792.47
- Monthly gross
- $5,420
- DTI
- 51.5%
- What the test does not use
- The house's mark
$466.02 + $1,986.45 + $215 + $95.
$2,762.47 + $30.
$2,792.47 ÷ $5,420.
The denominator is income. Track 9 lesson 1's two numbers.
The $30 BNPL sits inside 51.5 percent. The test is the sum against $5,420, not any one line against $5,420.
Check yourself
Monthly gross $6,180. Car $466.02, housing PI $1,986.45, card minimum $180, personal $140, one BNPL $30. What is DTI?
Household DTI is a capacity test on income, the same two-number comparison Track 9 lesson 1 runs on a securities account. Open A call is a test failing, not a decision being made →
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Educational only. Nothing in this lesson is investment, legal or tax advice, or a recommendation to enter into any transaction. Figures are illustrative and computed from the inputs stated in the lesson.