Debt-to-Income (DTI) Calculator

Back-end DTI, front-end housing DTI, and mortgage qualification guidance

Last updated: November 2025 . Sources: CFPB QM rule, FHA Handbook 4000.1, Fannie/Freddie selling guides

Monthly Income

$

Mortgage lenders always use gross income. Net is useful for self-check on actual affordability.

Housing (Front-End)

$
$
$
$
Total Housing (PITI + HOA)$2,220

Other Monthly Debts

$
$
$
$
$
$
Total Other Debt$800
Your Back-End DTI
46.5%
High (over 43%)

Above the CFPB qualified-mortgage safe-harbor threshold. Limits your options.

Conventional: may require strong compensating factors (excellent credit, high reserves) for approval up to 45-50%. FHA: still allows up to 50%, sometimes higher with manual underwriting + comp factors. Refinancing existing debt or paying down a card balance is the fastest fix.
Front-End (Housing) DTI
34.2%
28% rule threshold (exceeded)
Total Monthly Debt
$3,020
of $6,500 monthly gross income

DTI Bands (Lender Reference)

Under 28%
Excellent: ample room, easy approvals at best rates.
28-36%
Good: classic 28/36-rule comfort zone, all loan types qualify.
36-43%
Caution: still within CFPB QM safe-harbor; manageable but stretched.
Over 43%
High: above QM safe-harbor; FHA still allows up to 50% with comp factors.

How to Lower Your DTI

1
Pay off the smallest balances first. Eliminating a $300/mo auto payment improves DTI exactly like a $300/mo raise. Personal loans and auto loans usually amortize off in 3-5 years, attack the ones closest to payoff.
2
Refinance for a longer term. A 36-month auto loan refinanced to 60 months at the same rate cuts monthly payment ~40%. You pay more interest over time, but DTI improves immediately for qualifying purposes.
3
Increase documented income. A raise, second job, or 2-year history of bonus / overtime / side-gig income raises the denominator. Lenders want at least 2 years of self-employment or variable-income history before counting it.
4
Pay down credit cards to lower minimums. Minimum payments are usually 1-3% of the balance. Cutting a card balance from $10k to $2k drops the minimum from ~$200 to ~$40, which directly improves DTI (the balance itself does not, only the minimum).
5
Avoid new debt before applying. A new car loan in the 60 days before a mortgage application can sink your approval. Defer big purchases until after closing.
Lenders use gross income. Mortgage and personal-loan underwriting always computes DTI using gross (pre-tax) monthly income. Net income is a more honest personal-affordability check (taxes take 20-35%), but lenders ignore it. Self-employed borrowers usually have their two-year average net Schedule C / K-1 income (after deductions) used as "gross" for DTI purposes, which can hurt qualification.

Understanding Debt-to-Income

Front-End vs. Back-End DTI

Front-end DTI = total housing costs (mortgage P+I, property tax, insurance, HOA) divided by gross monthly income. Back-end DTI = ALL required debt payments (housing + auto + student + cards + personal + child support) divided by gross monthly income. Lenders look at both, but back-end is the primary qualifier. The classic "28/36 rule" caps front-end at 28% and back-end at 36%; today\'s loans often allow more.

Mortgage Qualifying Limits by Loan Type

The maximum DTI varies by loan program. FHA allows up to 50% back-end with compensating factors (some lenders push 56.99%). Conventional (Fannie Mae / Freddie Mac) typically caps at 45% standard, 50% with strong reserves and 720+ credit. VA has no hard DTI cap but uses a residual-income test that effectively limits most borrowers to ~41-50%. USDA caps at 41% back-end standard, 46% with comp factors. Manual underwriting can push higher but requires documented compensating factors (6+ months reserves, strong credit, large down payment, employment history).

CFPB Qualified Mortgage (QM) Rule

Born from the 2010 Dodd-Frank Act, the QM safe-harbor cap was originally 43% back-end DTI, the threshold the CFPB deemed reasonable under the Ability-to-Repay rule. The 2021 amendment replaced the hard 43% cap with a price-based test (loans priced within 150 basis points of APOR qualify regardless of DTI), but 43% remains the practical "safe" threshold most lenders aim for. Above 43%, lenders take on more legal liability if the borrower defaults.

What Counts and What Does Not

Counted: mortgage PITI, HOA, auto loan payments, student loan payments (or 0.5-1% of balance for income-driven plans), credit card minimums, personal loans, child support, alimony, judgments with payment plans. Not counted: utilities, internet, phone, streaming, insurance not tied to housing, retirement contributions, groceries, gym, gas, day care (with exceptions for FHA). Why? Because DTI measures REQUIRED debt obligations, things you cannot defer.

DTI vs. Credit Score

FICO has no income data, so DTI does NOT directly affect your credit score. But the two interact: paying down a credit card balance lowers utilization (a major FICO factor, accounts for ~30% of your score) AND lowers the minimum payment used in DTI. A high FICO with high DTI is still risky to lenders, and a moderate FICO with low DTI can sometimes beat it for approval, lenders price for both.

Frequently Asked Questions

How do lenders use DTI?

DTI = total monthly debt payments / gross monthly income. Mortgage and personal-loan lenders use it to judge if you can afford a new payment. Most conventional lenders prefer DTI under 43% (CFPB QM safe-harbor). DTI is a top-three approval factor alongside credit score and down payment.

What is the 28/36 rule?

A classic guideline: spend no more than 28% of gross monthly income on housing (front-end) and no more than 36% on all debt combined (back-end). Today\'s loans often allow more (FHA up to 50%, conventional 45-50%), but 28/36 still represents the "comfortable" zone.

What is the maximum DTI for a mortgage?

FHA: up to 50% with comp factors (some lenders 56.99%). Conventional: 45% standard, 50% with strong reserves + 720+ credit. VA: no hard cap, residual-income test. USDA: 41-46%. Manual underwriting can push higher but requires 6+ months reserves and strong credit.

What counts as "debt" for DTI?

Required monthly payments: mortgage PITI, HOA, auto, student loans, credit card minimums, personal loans, child support, alimony, judgments. NOT counted: utilities, internet, phone, streaming, gas, retirement contributions, day care (FHA has exceptions). DTI measures REQUIRED obligations.

How can I lower my DTI quickly?

Three fastest paths: (1) Pay off small-balance loans to eliminate the monthly payment entirely. (2) Refinance high-payment debt to a longer term. (3) Document a raise, bonus history, or side income to grow the denominator. Paying down a card without changing the minimum does NOT help DTI.

Does DTI affect my credit score?

No, FICO has no income data. But credit utilization (card balance / limit) IS a major FICO factor, paying down cards boosts your score AND your DTI. Lenders use FICO for credit-risk pricing and DTI for ability-to-pay; both matter for approval.

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