How an FHA Preapproval Amount Is Sized From Income and Debt

The Quick Read: The lender starts with your gross monthly income, subtracts the share that existing debts already use, and finds the largest housing payment the ratio limits allow. It then works backward from that payment to a loan amount. The result is a ceiling set by ratios, not a budget recommendation and not a promise to lend.

What Does a Preapproval Amount Actually Mean?

It is the largest loan a lender believes your income, debts, credit and down payment can support, based on the documents reviewed so far. It is a ceiling. It does not say what you should spend.

Three terms get mixed up. This table separates them.

A letter built on verified paperwork carries more weight than one built on a phone conversation. Even a verified letter is not final approval. The property still has to appraise and clear title, and your file has to stay the same.

How Is the Amount Sized, Step by Step?

The sizing runs in a fixed order. Across the wholesale programs Lendmire places FHA files with, the sequence is the same on nearly every file.

1. Count effective income. The lender documents what income is stable and likely to continue. This is often lower than what you feel you earn.

2. Add up recurring debts. Car loans, credit card minimums, student loans, child support and similar obligations come from the credit report and your documents.

3. Apply the ratio limits to gross income. Gross means before taxes. The base pair on an FHA file is 31/43: housing payment at 31% of gross income, total debts at 43%.

4. Find the housing payment that fits. Take the lower of the two answers. That is the most the full housing payment can be.

5. Back out the non-loan pieces. Property taxes, homeowners insurance, FHA mortgage insurance and HOA dues come off first. What is left is the room for principal and interest.

6. Convert that room into a loan amount. The term and interest cost turn a payment into a balance. This is where the loan amount appears.

7. Add the down payment to get a price range. The maximum financing is 96.5% of the lesser of price or appraised value, with a 3.5% minimum investment from a 580 decision score. Subject to lender guidelines and full file review.

The loan amount in step six is the base loan. The upfront mortgage insurance premium, 1.75% of the base loan, is financed on top of it. Its details sit in a later section.

Which Debts and Which Income Count?

Income is where files get lighter than borrowers expect. Debt is where they get heavier.

Income

A salaried borrower is generally qualified on current salary. An hourly borrower with steady hours is qualified on the current rate. Hourly pay with swinging hours usually gets averaged over a longer period. Overtime, bonus and commission income usually needs a documented history before it counts, and lenders often average it. Self-employed borrowers are qualified on documented net income over a multi-year history, and a falling trend can pull the number down or change how the file is reviewed.

The lender verifies all of this with pay stubs, employer verification or tax documents. Income you cannot document does not make it into the number.

Debts

The CFPB defines DTI as all monthly debt payments divided by gross monthly income, and notes that limits differ by loan product and lender. On an FHA file the debt side is strict about student loans. HUD’s Mortgagee Letter 2021-13 requires the lender to include all student loans in the borrower’s liabilities, regardless of payment type or status. That letter replaced an earlier policy that used a percentage of the balance for deferred loans.

In practice, a loan in deferment or an income-driven plan with a zero payment still gets a placeholder payment in the ratio. That placeholder can be higher than what you really pay. Lendmire’s piece How to Get Approved for an FHA Loan With a High DTI From Student Debt walks through that problem in detail.

Which Ratio Binds: Housing or Total Debt?

The tighter ratio sets your limit, and it flips depending on how much other debt you carry. Two borrowers with identical income can hit different walls. These examples use shares of gross income, no dollar figures.

Borrower A carries light debt. Existing debts use 10% of gross monthly income. The total-debt ratio of 43% would leave 33% for housing. But the housing ratio caps at 31%. So the housing ratio binds, and the amount is set at 31% of gross income for the whole housing payment.

Borrower B carries heavy debt. Existing debts use 20% of gross monthly income. The total-debt ratio of 43% leaves 23% for housing. That is under the 31% housing cap. So the total-debt ratio binds, and the amount is set at 23%.

Borrower B’s housing room is smaller by eight points of income. Paying off a car loan can lift the amount more than a raise would.

The 31/43 pair is the base with no compensating factors. Documented compensating factors can lift the ratios as far as 40/50 at the top tier. Examples include meaningful cash reserves, a low jump from your current housing payment, or strong credit. Most files in the programs Lendmire works with are decided by the automated finding rather than the base pair, so a strong automated result can behave differently from the manual table. HUD’s Handbook 4000.1 is the agency’s consolidated policy source for these rules. It is revised periodically, and the lender’s current version controls.

Borrowers whose debt-to-income ratios press against the ceiling often look at FHA loan programs, where the income and debt tests work together. You can read about Lendmire’s FHA loan programs before you apply.

How Does Mortgage Insurance Shrink the Amount?

FHA mortgage insurance is part of the housing payment, so it eats into the ratio room before principal and interest gets a share.

There are two pieces. The upfront premium is 1.75% of the base loan, and it is financed, which raises the balance. The annual premium is billed monthly inside the payment. It runs between 0.15% and 0.75% of the balance, depending on term, loan amount and LTV, and HUD’s Mortgagee Letter 2023-05 is the HUD document that set the annual premium schedule.

Duration matters too. On a thirty-year loan above 90% LTV, the annual premium lasts for the term. At or below 90% LTV, it ends after eleven years. A larger down payment can therefore change both the premium and how long it lasts. Terms depend on the lender’s guidelines, the property type, the leverage, and a full review of the credit profile.

The effect on sizing is simple. Every dollar of the payment that goes to mortgage insurance is a dollar not available for principal and interest. The same income supports a smaller base loan once insurance is counted.

What Moves the Amount? A Sensitivity View

This table shows direction only. It carries no figures.

Taxes and insurance are the swing items. Two buyers with the same income and debt can see different amounts, because one county’s tax bill is heavier than another’s. The loan estimate for the home you choose, not a generic calculator, shows that effect.

Where Does the General Rule Break?

The sizing sequence holds. The inputs get strange in specific cases.

• Deferred or zero-payment student loans. They count. The placeholder payment can exceed your real one.
• Self-employed borrowers. Income comes from documented net earnings over a multi-year history. A declining trend can shrink the number or change how the file is reviewed.
• Variable pay. Overtime, bonus and commission without a documented history may not count, or may count only in part.
• Employment gaps and job changes. A gap or frequent changes in line of work usually calls for extra documentation of stability.
• Non-occupant co-borrowers. The program allows one. That person’s debts enter the ratios along with their income.
• New debt after the letter. A new auto loan or credit line can undo a preapproval. Hold off on new credit until closing.
• Lender overlays. A lender can be stricter than the program minimums. This is a common reason two lenders show different amounts for the same borrower.
• Refinance borrowers. The FHA Streamline refinances an existing FHA loan with no appraisal, a limited credit review and a net tangible benefit. The FHA cash-out reaches 80% LTV on a home owned and occupied for 12 months before the case number. Documentation differs from a purchase.

Credit events carry waiting periods. HUD’s rules call for two years from a chapter 7 discharge and three years from a foreclosure. These are HUD rules, not a promise from any lender.

Do County Loan Limits Cap the Amount?

Yes. FHA sets loan limits by county, and they change every year. If your ratios support more than the county limit, the limit wins. If the limit is high and your ratios are low, the ratios win.

Treat the limit as a ceiling, not an affordability measure. County loan limits apply, so check your county’s current figure with your loan officer before house hunting. The figure is not worth guessing at.

Why Can the Amount Change After Preapproval?

Because the letter rests on assumptions. Several things shift between the letter and closing:

• The appraisal. The loan is based on the lesser of price or appraised value, so a low appraisal lowers the maximum loan.
• New debt or a changed credit profile.
• A job change or a drop in documented income.
• A different property, with different taxes, insurance or HOA dues.
• Reserves or gift funds that cannot be documented.

Keep your file steady. Tell your loan officer before you change jobs, finance furniture or open a card.

Ways to Raise the Amount, Ranked by Impact

1. Pay off or pay down the monthly debts with the largest payment relative to balance.

2. Document additional steady income, such as a second job with a history.

3. Choose a home in a county or condo community with lower taxes and dues.

4. Add compensating factors, such as reserves.

5. Raise the decision credit score, which can affect which tier applies.

6. Add a non-occupant co-borrower when the file supports it.

Preapproval Amount vs. Comfortable Budget

The ratios are measured on gross income. They do not account for take-home pay, childcare, retirement savings, utilities or commuting. A borrower approved at the top of the ratio range has little slack for any of those.

A practical way to stress-test: take the monthly payment you would be comfortable with, then work backward the same way a lender does. A comfortable payment will produce a lower price range than the ceiling. Shop to that number, not the letter.

Key Terms Defined

Gross monthly income. What you earn before taxes and deductions, used for every ratio.

Front-end ratio. The full housing payment divided by gross monthly income.

Back-end ratio. The housing payment plus all recurring monthly debts, divided by gross monthly income.

Compensating factors. Documented strengths, such as reserves or a small payment increase, that can support higher ratios.

Base loan amount. The loan before the financed upfront mortgage insurance premium is added.

Overlay. A lender rule stricter than the program minimum.

Next Step

If you are buying a home and want to see whether an FHA loan fits your file, Lendmire can help you compare the options and what each one asks of the file. Program details are subject to lender guidelines and full file review, and nothing here is a commitment to lend.

For your own numbers, request a scenario review with Lendmire.

About Lendmire

Lendmire — NMLS# 2371349 — is a mortgage broker that arranges FHA, VA, conventional and jumbo home purchase and refinance financing in 16 states through wholesale lenders. Every option is subject to the lender’s guidelines and full underwriting. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. CFPB defines DTI

2. HUD Mortgagee Letter 2021-13 (Student Loan Payment Calculation)

3. HUD Handbook 4000.1 (archived)

4. HUD Mortgagee Letter 2023-05