The Quick Read: DTI counts the required monthly payments you carry compared with your gross monthly income, and the structure of your down payment help decides whether it touches that ratio. A grant adds no payment. A forgivable second has no monthly payment, so it usually adds nothing to the ratio, though the lender still sees the lien. A repayable second adds a real monthly payment, and that payment counts. Here, “DTI” means mortgage debt-to-income, not any other use of the acronym.
DTI in Plain Terms
DTI is a comparison of what you owe each month with what you earn each month before taxes. The lender adds up the proposed housing payment and the recurring debts on your credit report, then divides by gross monthly income.
1. Add the proposed monthly housing payment: first mortgage principal and interest, taxes, insurance, mortgage insurance and any association dues.
2. Add recurring debts: car loans, student loans, credit cards, support obligations.
3. Divide the total by gross monthly income.
The result is the back-end ratio. The housing-only version, using step one alone, is the front-end ratio. When a lender says “your DTI,” it usually means the back-end number.
| Ratio | What it includes | Which one lenders usually mean |
|---|---|---|
| Front-end | Housing payment only | Secondary, unless the program tests it |
| Back-end | Housing plus all recurring debts | The one people usually mean |
Programs differ on which ratio they test. FHA files commonly run through an automated underwriting system (AUS), and the finding sets the ratios that file can carry. Manual FHA underwriting uses a 31/43 benchmark, and automated approvals commonly allow more. USDA tests both ratios separately, as covered below.
Why Down Payment Help Changes the Math
Assistance comes in four shapes through the wholesale lenders Lendmire works with, and each one touches your ratio differently. Lendmire’s down payment assistance programs pair these shapes with FHA, USDA or HUD-184 first mortgages. The mechanics are the same on every file: the structure sets the payment, and the payment sets the ratio.
The central question is whether the assistance creates a monthly payment. Nothing else matters as much. A grant has no lien and no payment. A forgivable second has a lien but no payment. A repayable second has both.
Nobody has to be a first-time buyer for any of these. Repeat and move-up buyers qualify. Every option is for an owner-occupied primary residence only, never a second home or a rental.
How Each Assistance Type Hits Your Ratios
Here is the side-by-side, the part most DTI explainers skip.
| Structure | Monthly payment? | In housing ratio? | In total ratio? | Still a lien? |
|---|---|---|---|---|
| Grant | None | No | No | No |
| Forgivable second | None | Usually no | Usually no | Yes |
| Repayable second | Yes | Yes | Yes | Yes |
| Refinance-cost second | Yes | Yes | Yes | Yes |
The grant. The grant option covers 2% or 3.5% of the purchase price toward the FHA minimum investment. There is nothing to repay. It is released at closing with no lien, no interest and no payment, so it adds nothing to either ratio. The credit floor is 620, and eligibility turns on household income at or below 140% of area median income or a qualifying category, such as public service, education, medical work, military service, first-time buyer status or an underserved census tract. An HUD-approved homebuyer education course is required. The grant pairs with FHA first liens only and is not offered in Washington.
The forgivable second. This is 3.5% of the lesser of price or appraised value. No interest and no monthly payment, and it is forgiven after the first 36 or 60 on-time first-lien payments, depending on the version. The credit floor is 640, or 660 on a blended score. It pairs with FHA, HUD-184 and USDA first liens on one- and two-unit homes. Because no payment is due, your ratios are unchanged.
Here’s the catch. “Forgivable” does not mean “gift.” A gift is money with no expectation of repayment, and HUD’s FHA Handbook 4000.1 treats it that way. Anything secured by a lien is secondary financing. The lender discloses the lien, documents it and counts it in combined leverage even when it adds no payment. Whether a particular file treats the lien as a payment still depends on the handbook and the AUS finding, so the lender confirms it file by file.
The repayable second. This is 3.5% or 5% of the lesser of price or value. At 5%, it covers the 3.5% minimum investment plus 1.5% toward closing costs and prepaids. It is a real loan: interest-bearing, with a monthly payment on a 30-year amortization and a balloon due in year 10. It carries its own loan disclosure and balloon disclosure. The credit floor is 660, or 670 blended. Manual underwriting is not allowed, so the file needs an AUS approval. That payment lands in your housing payment, so it counts in both ratios.
The refinance-cost second. On an FHA refinance, this second covers 1% to 3.5% of the balance toward closing costs, with combined leverage up to 104%. It has the same repayment terms as the repayable second, so it counts the same way. Leverage, reserves, and pricing vary by lender and program; the final terms follow the full file review.
Where the Limits Come From
Three layers set the ceiling, and the strictest one wins.
1. The first-loan program. FHA, USDA and HUD-184 each have their own ratio rules.
2. The assistance structure. The repayable and forgivable options follow the AUS finding. The forgivable option allows manual underwriting. The repayable option does not.
3. The lender’s own overlays and your compensating factors, such as reserves, steady employment and a strong payment history.
USDA is the strictest on housing ratio. USDA’s Chapter 11 handbook sets standard thresholds of 29 percent for the PITI ratio and 41 percent for total debt, and lets lenders exceed them only with strong compensating factors. PITI there includes the first mortgage, subordinate liens, insurance, taxes, mortgage insurance and association dues. A repayable second on a USDA file therefore adds to the PITI and pushes straight into the tighter housing-ratio test, while a grant with nothing to repay does not. Waivers have hard ceilings, so a borderline file cannot be talked past them.
The same handbook has a trap on the debt side. If your credit report shows a balance with no listed payment, the payment must be calculated as five percent of the balance.
HUD-184 works differently. HUD’s own handbook states the program does not itself provide down payment help, so any assistance comes from the lender’s program or another provider. Subordinate financing may be used, but it must be included in the applicant’s qualifying ratios, and underwriting is manual. A human weighs the second’s payment. HUD’s borrower page also warns that added debt raises your ratio and lowers what you may qualify for. Check current Section 184 guidance for the exact ratio, because older summaries can be stale.
FHA publishes no single guaranteed maximum. The AUS finding decides, which is why a borderline file can come back approved on one structure and refer on another.
Edge Cases and Traps
- The undisclosed second. Secondary financing must be disclosed at application. A second that surfaces late can stall or kill a file.
- A note that starts requiring payments. A forgivable second is built with no payment while you stay current on the first lien. Read the terms. A structure that begins billing you changes the ratio you qualified on.
- Early exit. A forgivable second only forgives after the required on-time first-lien payments. Selling, refinancing or moving out before then can trigger repayment.
- Balloon timing. The repayable second has a balloon in year 10. It does not change your qualifying ratio, but it belongs in your long-term plan.
- Payment shock. A repayable second layered on a high-leverage first lien can push the housing ratio past the USDA 29 percent test. FHA is looser, but not unlimited.
- Seller-linked money. Funds from a party with an interest in the sale are treated as inducements, not gifts. HUD curtailed seller-funded “charitable” assistance for this reason, as the 1999 Federal Register notice explains.
- No stacking. No option combines with another assistance program, and a mortgage credit certificate is not permitted with the second-lien options.
On the lien side, a closing-cost variant on an FHA 203(b) first lien covers down payment, closing costs and prepaids on the same terms as the repayable second.
A Buyer Walk-Through, No Dollar Figures
Picture one buyer with a steady salary, a car loan and student debt. Run that buyer through each structure, using the same income and the same first mortgage.
With the grant, the monthly picture is just the first mortgage, taxes, insurance and mortgage insurance. Ratios stay at their base level.
With the forgivable second, the monthly picture is identical, because the second carries no payment. The lender still counts the lien in combined leverage.
With the repayable second, the first-mortgage payment stays the same, but a second payment joins the housing line. Both ratios rise. For a buyer already near the ceiling, that can be the difference between an AUS approval and a referral.
That is why DTI-tight buyers tend to start with the grant or forgivable second, while buyers with room can use the repayable second, especially at 5% where closing costs are covered.
Choosing by DTI Situation
| Your situation | Structure to look at first |
|---|---|
| Tight DTI | Grant or forgivable second |
| Roomy DTI, thin savings | Repayable second, 5% for closing costs |
| Heavy student debt | Grant or forgivable second |
| Wants no lien at all | Grant |
| Income above the grant limit, no qualifying category | Forgivable or repayable second (no income limit beyond USDA’s) |
| Needs manual underwriting | Forgivable second, not the repayable |
Through wholesale lenders, all of this is subject to program guidelines and full underwriting.
How to Lower DTI Before You Apply
- Pay off small installment loans and cards with balances, which removes the payment entirely.
- Check your credit report for balances showing no payment, especially for USDA files.
- Avoid new debt between application and closing.
- Document extra income that is stable and recurring.
- Keep reserves. They count as a compensating factor when ratios run high.
Questions to Ask Your Lender
1. Which ratio does this program test, and what is my number now?
2. Does my assistance create a monthly payment on the second?
3. Will my file be underwritten manually or through AUS?
4. Is there a lien, and what triggers repayment?
5. What changes if I lower my debts before closing?
Free help is available. HUD-approved housing counselors can compare options with you.
Key Terms Defined
Back-end ratio: Your total monthly debts, including the new housing payment, divided by gross monthly income.
Front-end ratio: The housing payment alone divided by gross monthly income.
Secondary financing: Any loan secured by a lien behind the first mortgage, including forgivable and repayable seconds.
Balloon: A lump sum due at the end of a set term, year 10 on the repayable second.
AUS: Automated underwriting system, the software finding that sets ratio limits on many FHA files.
Compensating factors: Strengths like reserves or a long job history that let a lender approve a higher ratio.
Frequently Asked Questions
Does a forgivable second count in my DTI?
Usually no, because it has no monthly payment. It is still a lien, so the lender discloses it and counts it in combined leverage.
Does a grant count in DTI?
No. A grant carries no lien and no payment, so neither ratio changes. It is released at closing with nothing to repay.
Does a repayable second count in DTI?
Yes. Its monthly payment joins the housing payment, so it counts in both ratios. On a USDA file it hits the tighter housing test too.
Do I need to be a first-time buyer?
No. Repeat and move-up buyers qualify for all four structures. The first-time definition is only one of the grant’s qualifying categories.
What if my DTI is too high?
Pay down debts, add compensating factors or switch to a structure with no payment. A grant or forgivable second keeps the ratio where it was, subject to lender guidelines and underwriting.
Next Step
If you are buying a primary home and want to see whether a down payment assistance option fits your file, Lendmire can help you compare the grant, forgivable and repayable structures alongside an FHA, USDA or HUD-184 first mortgage.
Investors who want the broader program framework can review how DSCR loans work.
About Lendmire
Lendmire — NMLS# 2371349 — is a mortgage broker that arranges FHA, USDA and HUD-184 home purchase financing with grant-style, forgivable and repayable down payment assistance options 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.
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References
2. USDA RD HB-1-3555 Chapter 11
This article is part of Lendmire’s First Time Home Buyer series — every loan program’s qualification details, guidelines, and scenarios live on the loan options page.
Related reading: Does a Grant or Repayable Second Skip the Occupancy Requirement? · How a Deferred Second Mortgage Hits Your DTI With Down Payment Assistance · Does Down Payment Assistance Have an Income Limit?
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Disclosure information. Lendmire is a state-licensed mortgage brokerage under NMLS# 2371349. Lendmire is not a depository institution, direct lender, or financial advisor — all loans referenced are placed through wholesale lender partners and are subject to each lender's underwriting standards. This article is provided for general informational purposes and is not a commitment to lend, nor does it constitute financial, legal, or tax advice. Loan programs, terms, rates, and qualification standards change without notice and depend on borrower profile, property type, and the state in which the subject property is located. Equal Housing Opportunity provider. NMLS Consumer Access: nmlsconsumeraccess.org.