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Estimate two percentages before you apply: your total monthly mortgage payment divided by effective monthly income, and your total fixed monthly payments divided by that same income. Then compare both results with the FHA manual-underwriting row that matches your minimum decision credit score and any required compensating factors. This is a preparation check, not an approval decision; an FHA lender must verify your income, liabilities, payment assumptions, credit, assets and documentation.
What the two FHA debt-to-income ratios measure
FHA underwriting uses two related ratios. The first is the housing, or front-end, ratio. It measures the proposed total monthly mortgage payment against effective monthly income:
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Housing ratio = total monthly mortgage payment ÷ effective monthly income × 100
The second is the total fixed-payment, or back-end, ratio. It measures the proposed total mortgage payment plus monthly obligations on debts and liabilities against effective monthly income:
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Total DTI = total fixed monthly payments ÷ effective monthly income × 100
Use the payment amount the lender will actually underwrite. A principal-and-interest-only estimate can understate the qualifying payment if taxes, insurance, mortgage insurance or applicable association charges are included in the lender’s total. Ask the lender which items are in its payment calculation.
Use effective income, not the amount that reaches your bank account after taxes and deductions. Effective income is the amount the underwriter determines is eligible after required verification, stability and other FHA rules are applied. Your own estimate is useful for preparation, but it cannot establish that income will be accepted.
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FHA manual-underwriting limits currently listed by HUD
HUD Handbook 4000.1, Update 17, published August 12, 2026, lists the following manual-underwriting combinations. The first number is the maximum housing ratio; the second is the maximum total fixed-payment ratio.
| Lowest minimum decision credit score | Maximum qualifying ratios | Condition in the HUD matrix |
|---|---|---|
| 500–579, or no credit score | 31/43 | No compensating factors to exceed these ratios are listed for this row. |
| 580 and above | 31/43 | No compensating factor required. |
| 580 and above | 37/47 | One specified compensating factor must be verified and documented: cash reserves, a minimal increase in housing payment, or residual income. |
| 580 and above | 40/40 | No discretionary debt. |
| 580 and above | 40/50 | Two specified compensating factors must be verified and documented: cash reserves, a minimal increase in housing payment, significant additional income not reflected in effective income, and/or residual income. |
These are conditional manual-underwriting limits, not a universal FHA rule that every borrower can use. A 43% total DTI is not the only FHA limit, and a ratio below a listed figure does not promise approval. The applicable row depends on the minimum decision credit score, the underwriting path and the conditions documented in the file.
HUD also notes 33/45 stretch ratios for Energy Efficient Homes. That provision is limited to the circumstances covered by the handbook; do not apply 33/45 to every FHA purchase.
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How to check your ratios step by step
1. Gather a realistic mortgage-payment estimate
Start with the property price, loan amount, interest-rate assumption and term you are considering, then obtain a lender-style estimate of the total monthly mortgage payment. Request a written breakdown so you know whether the estimate includes every charge the lender will count. If the rate, taxes, insurance or property details are uncertain, run a conservative version as well as your best estimate.
2. Determine the monthly effective income to test
List each income source you expect to use and convert the amount to a monthly figure using the lender’s qualifying method. Keep records showing the source, amount, continuity and any conditions attached to the income. Do not include income merely because it appears on a budget; the lender must decide whether it is effective income under FHA rules.
If the file involves borrowers with no credit score, the cited HUD page says the ratios are computed using income only from occupying borrowers obligated on the mortgage. Income from a non-occupant co-borrower may not be included in that calculation. Tell the lender about every borrower and occupancy arrangement before relying on a combined income figure.
3. Calculate the housing ratio
Divide the total proposed mortgage payment by effective monthly income and multiply by 100. For example, a $2,100 payment and $7,000 of effective monthly income produce a 30% housing ratio:
$2,100 ÷ $7,000 × 100 = 30%
Keep at least one decimal place while checking your file. Rounding a borderline result down can make an estimate look compliant when the lender’s exact figures are not.
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4. Add every monthly debt and liability the lender may count
Build a complete monthly-obligation list before calculating the back-end ratio. Include the proposed mortgage payment and recurring obligations that will appear in the lender’s credit, income or liability review. Common examples include installment loans, minimum revolving-credit payments, student-loan obligations, alimony or other legally required payments, and debts disclosed in the application. The lender determines the qualifying amount and treatment for each item, so ask how unusual, deferred, disputed or recently paid accounts will be handled.
5. Calculate total DTI
Add the mortgage payment to the monthly obligations that the lender expects to count, then divide by effective monthly income. If the mortgage payment is $2,100 and other counted obligations total $800, total fixed payments are $2,900. With $7,000 of effective income:
$2,900 ÷ $7,000 × 100 = 41.4%
The result is the back-end DTI, not 41.4% of take-home pay. It is compared with the applicable FHA row using the same effective-income denominator as the housing ratio.
6. Identify the correct matrix row
Use the minimum decision credit score that the lender will use for the application, not simply the highest score shown by a consumer credit service. If the score is 500–579 or there is no score, begin with 31/43. If the score is 580 or higher, start with 31/43 and move to a higher row only when the required condition or conditions are present and documented.
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Give the lender your payment assumptions, income list and debt schedule. Ask the loan officer or underwriter to confirm the effective income, counted liabilities, minimum decision score, underwriting path and documentation needed for any compensating factor. A basic calculator can perform the division, but it cannot reproduce FHA’s automated underwriting system or determine eligibility.
Worked examples
Example 1: score below 580
A borrower has a 560 minimum decision credit score, $7,000 of effective monthly income, a $2,100 total mortgage payment and $800 of other counted monthly obligations. The housing ratio is 30%; total DTI is 41.4%. Both figures are below the 31/43 row for scores of 500–579. That makes the ratios consistent with that manual row, subject to all other FHA eligibility and documentation requirements. It does not guarantee that the loan will be approved.
Example 2: score of 580 or higher with one factor
A borrower with a 600 minimum decision credit score has $6,000 of effective income, a $2,000 mortgage payment and $800 in other counted obligations. The housing ratio is 33.3%, and total DTI is 46.7%. Those results exceed 31/43 but fit within 37/47 if the lender verifies and documents one listed factor, such as eligible cash reserves, a minimal increase in housing payment or residual income. Without that factor, the higher row cannot simply be assumed.
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Example 3: the 40/50 row
A borrower with a minimum decision score of 620 has $8,000 of effective monthly income, a $3,120 mortgage payment and $800 in other counted obligations. The housing ratio is 39%; total DTI is 49%. Those figures fit within 40/50 only if the lender documents two qualifying factors from the handbook’s list. The calculation identifies the row to discuss; it does not decide whether the borrower’s specific evidence satisfies the factor definitions.
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Suppose an occupying borrower has $5,000 of effective income and a non-occupant co-borrower has $3,000. If the occupying borrower has no credit score, do not automatically divide the proposed payments by $8,000. The cited HUD rule says income from a non-occupant co-borrower may not be included when computing the ratios for borrowers with no credit score. The lender must apply the exact occupancy and obligation rules to the file.
What the compensating factors mean in practice
Verified and documented cash reserves
Reserves are funds the lender can verify and document as available after considering the transaction. Do not treat an unverified account balance, borrowed money or a future bonus as an automatic compensating factor. Ask which account statements, ownership evidence and timing the lender requires.
Minimal increase in housing payment
This factor compares the proposed housing payment with the borrower’s established housing expense. A small change may support the higher ratio, but the lender decides what is minimal and what history can be documented. Provide evidence of the current payment and explain any recent move, lease change or unusual housing arrangement.
Residual income
Residual income is the amount left after the proposed obligations and other required expenses are considered. It is not the same as a simple take-home-pay calculation. The lender determines the method, household information and documentation needed to establish it.
Significant additional income not reflected in effective income
The 40/50 row allows this factor only when the income is significant and supportable but is not included in effective income for the primary qualification calculation. Explain the source to the lender before counting on it. Income that cannot be verified, is too recent or fails FHA’s eligibility rules should not be treated as a compensating factor.
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No discretionary debt
The 40/40 row is conditioned on no discretionary debt. The lender must determine which obligations meet that condition and how the borrower’s liabilities are classified. Do not assume that having a low debt balance, paying cards in full or omitting an account from your personal worksheet satisfies the requirement.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Manual underwriting versus FHA TOTAL Scorecard
FHA’s TOTAL Scorecard is a statistically derived algorithm accessed through an automated underwriting system. It returns a process classification of Accept or Refer. A Refer result calls for manual underwriting by an FHA Direct Endorsement underwriter.
TOTAL does not replace the lender’s complete review. HUD states that all forward mortgage transactions must be scored through TOTAL except Streamline Refinances and assumptions. HUD also states: “The Mortgagee may not accept or deny an FHA-insured Mortgage based solely on an assessment generated by TOTAL.” An Accept result therefore is not a final approval, and a self-calculated DTI cannot predict the system’s result.
The manual matrix is most useful when your lender is applying manual underwriting or when you need to understand the conditions behind a ratio discussion. Ask whether the file is being evaluated through TOTAL, manually, or through another permitted process, and what documentation that path requires.
Why a ratio check can differ from the lender’s result
- Different income denominator: the lender may exclude, adjust or average income that you included.
- Missing liability: a credit report, application item or required obligation may add to total fixed payments.
- Payment estimate too low: taxes, insurance, mortgage insurance or property-specific charges may increase the underwritten mortgage payment.
- Wrong score row: the lender’s minimum decision score may differ from the score you used.
- Unsupported compensating factor: a factor may need specific evidence or may not meet the handbook definition.
- Rounding: a result near a limit can cross the line when the lender uses unrounded figures.
- Outdated guidance: handbook provisions and effective dates can change, so verify the current Handbook 4000.1 and the lender’s implementation.
When your worksheet and the lender’s worksheet disagree, request the exact income, payment and liability figures used. Correct the underlying input rather than trying to make the percentage fit a preferred row.
Ways to improve the numbers before applying
Start with the largest controllable input: the proposed payment. A less expensive property, larger down payment or different rate and term may reduce the housing and total ratios, although each choice has other costs and eligibility consequences.
Next, review debts with the lender. Paying or restructuring an obligation can change the monthly amount counted, but do not move money or close accounts without understanding the effect on reserves, credit and documentation. Avoid taking on new debt while the application is being prepared.
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsFinally, organize evidence for stable income, reserves and any possible compensating factor. Documentation cannot turn ineligible income into effective income, but missing documents can prevent the lender from using otherwise eligible information.
Questions to take to an FHA lender
- What total monthly mortgage payment will you use, and which components are included?
- What effective monthly income will you use for each borrower, and how was it calculated?
- Which debts and liabilities will be included in total fixed payments?
- What is the minimum decision credit score for the application?
- Will the file be evaluated through TOTAL, manual underwriting, or another permitted process?
- If the ratios exceed 31/43, which compensating-factor row could apply?
- What documents are required for reserves, housing-payment history, residual income or additional income?
- Does the no-score rule affect a non-occupant co-borrower’s income in this file?
- Are any Energy Efficient Homes provisions relevant, and what requirements must the property meet?
- Which version and effective date of Handbook 4000.1 governs this application?
Bottom line
Calculate the housing ratio and total DTI using the lender’s likely payment, complete monthly liabilities and FHA-defined effective income. Compare both percentages with the manual row for the borrower’s minimum decision credit score: 31/43 for the 500–579 or no-score row, and the conditional 31/43, 37/47, 40/40 or 40/50 rows for scores of 580 and above. Then have an FHA lender verify every input and document the underwriting path. Your worksheet can show where you stand, but only the lender’s complete, current FHA review can determine qualification.
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