Yes. A single mom on one income can buy a house, and the underwriting is the same math any one-income buyer faces: documented income against monthly debts, credit score against a program floor, savings against a down payment that program guidelines set as low as 3% to 3.5%. Nothing in the guidelines counts the paychecks in your household or the kids at your table. What decides the file is how the numbers get assembled, and that's where most people leave money on the table.
One note first. I'm using "single mom" because that's how people type the question. Under the Fair Housing Act, sex and familial status (having children under 18) are protected classes, and a lender may not treat your application differently, give you different information, or discourage you from applying because of either one (24 CFR 100.120). And under the Equal Credit Opportunity Act, when you rely on child support or alimony to qualify, a lender must consider it as income to the extent it's likely to be consistently made (12 CFR 1002.6(b)(5)). Everything below applies to any buyer qualifying on one income.
How is debt-to-income calculated on one income?
Debt-to-income (DTI) is your monthly debts divided by your gross monthly qualifying income. One income doesn't change the formula; it means every dollar of income you document and every dollar of debt you pay off moves the ratio more than it would for a two-earner household. The ceilings depend on the program and on whether a computer or a human underwrites the file:
- Conventional (Fannie Mae): up to 50% DTI on a Desktop Underwriter approval; manually underwritten files cap at 36%, stretching to 45% with credit and reserve requirements (Selling Guide B3-6-02, as of April 2025).
- FHA: manual underwriting starts at 31% housing / 43% total and steps up to 40/50 with documented compensating factors (HUD Handbook 4000.1, revised November 2025). Automated FHA approvals can run higher, and in my experience they regularly do.
- VA: a 41% guideline, with files above it approved when residual income (what's left after every debt) beats VA's regional table by at least 20%, or other compensating factors are documented (VA Lenders Handbook, Chapter 4).
Which debts count and which don't (daycare doesn't; court-ordered support you pay does) is covered in what you need to qualify for a mortgage. This article picks up on the income side of the ratio.
Does child support or alimony count as income for a mortgage?
It can, and on a one-income file it often changes the answer. It has to be documented a specific way, and two rules trip people up: how long you've received it, and how long it will keep coming.
Conventional (Fannie Mae Selling Guide B3-3.4-02, effective March 4, 2026): a minimum six-month history of "full, regular, and timely payments," proven with bank statements, cancelled checks, or electronic payment records; documentation that the income "is expected to continue for at least three years from the note date"; and terms from a decree, separation agreement, or court order. Separated with no written agreement? Then "the lender should not consider any proposed or voluntary payments as income."
FHA (HUD Handbook 4000.1, revised November 26, 2025): court-ordered support needs three months of documented receipt to use the current payment; a voluntary agreement needs six months of consistent receipt plus 12 months of cancelled checks, deposit slips, or tax returns documenting the agreement itself. Either way the lender must show the income "will continue for at least three years." Miss the receipt window and FHA uses a two-year average instead.
The three-year continuance rule is the one to check before you apply. If your youngest reaches the age that ends support under your order within three years of closing, that support generally can't be counted. If it ends in four years, it generally can. Same check, different answer, and the only thing that changed is a date on the order.
Two more mechanics people miss. Disclosing support income is your choice; a lender may include it only if you disclose it, and I see files every month where nobody did. And because child support is usually not taxable to you, it gets "grossed up" for qualifying: Fannie Mae allows adding 25% to verified non-taxable income, and FHA allows the greater of 15% or your prior-year tax rate. A $900 monthly payment can count as $1,125 on a conventional file. Alimony's tax treatment depends on when your agreement was signed, so ask your tax professional.
Here's the effect, as an illustrative example, not an offer, quote, or promise of any loan, rate, or payment. A buyer earns $5,000 a month gross from a W-2 job, carries a $350 car payment and $100 in minimum card payments, and receives $900 a month in court-ordered support for a nine-year-old, documented for 12 months.
| Scenario | Qualifying income | Max total debt at 45% | Max housing expense at 45% DTI |
|---|---|---|---|
| Without counting support | $5,000 | $2,250 | $1,800 |
| With support, grossed up 25% (conventional) | $6,125 | $2,756 | $2,306 |
Roughly $500 a month of additional housing budget in this example, from the same household, just from documenting money that was already coming in. Pay off the car first and it grows again. (Illustrative math; your program, ceiling, and payment depend on your file.) Run your own version on my purchase calculator.
Which low-down-payment programs fit a one-income buyer?
The 20% down myth is the most expensive misconception in home buying; I covered it in how much house can I afford. These are the programs I compare first for a one-income file, and none of them has a "single income" rule.
| Program | Minimum down | Credit floor (program level) | Income limit | Good fit when |
|---|---|---|---|---|
| FHA | 3.5% with a 580+ score; 10% at 500-579 | 500 | None | Score in the 500s or low 600s, or DTI needs the manual-underwrite tables |
| HomeReady (Fannie Mae) | 3% | 620 | 80% of area median income | Income under the AMI cap, score 620+; reduced mortgage insurance |
| Home Possible (Freddie Mac) | 3% | 620 | 80% of area median income | Same as HomeReady; the two treat non-occupant co-borrowers differently |
| VA (eligible veterans and service members) | 0% | No program minimum; lender overlays vary | None | You have VA entitlement; residual-income underwriting rewards a lean budget |
Program figures as of September 2026 from HUD Handbook 4000.1, Fannie Mae Selling Guide B5-6-01, and Freddie Mac's Home Possible page. Lenders add overlays on top of these floors, which is why one denial doesn't mean the guideline said no. Two things in that table matter more for one-income files: don't treat FHA as the backup plan (with a mid-600s score, its flatter pricing and written compensating-factor tables can make it the better fit), and the 80% AMI cap cuts the opposite way from what people expect, because a single earner often lands under a cap that a two-earner household would blow through.
What down payment assistance exists in the states I'm licensed in?
Down payment assistance is income-based, not household-based, and it pairs with the loans above. The national overview is in how DPA programs work; here are three concrete examples inside my 15 states, as of September 2026. Each runs through a participating lender, and limits change.
Arizona: Home Plus (Arizona Industrial Development Authority). Up to 4% of the loan amount for down payment and closing costs, as a second mortgage fully forgiven after 60 months if you stay in the home. Borrower income cannot exceed $155,386 (as of April 6, 2026), it's available in every Arizona county, one borrower completes homebuyer education, and there is no first-time-buyer requirement.
California: CalHFA MyHome Assistance Program. A deferred-payment junior loan of up to 3.5% of the purchase price or appraised value (whichever is less) with an FHA first mortgage, or up to 3% with a conventional first. No monthly payment; it's repaid when you sell, refinance, or transfer. First-time buyer, owner-occupancy, and homebuyer education required. CalHFA income limits effective June 30, 2026: $214,000 in Los Angeles County, $274,000 in Orange County, $259,000 in San Diego County. For a single earner, the cap is rarely the obstacle.
Texas: TSAHC (Texas State Affordable Housing Corporation). Home Sweet Texas and Homes for Texas Heroes offer 2% to 5% of the loan amount as an outright grant (with FHA, USDA, or VA firsts) or a three-year deferred forgivable second lien. Credit as low as 620 on government loans, income limits by county, no first-time-buyer requirement except for the mortgage credit certificate.
Most of my other licensed states run a housing finance agency program with a similar shape; tell me the state and I'll pull the current sheet.
What compensating factors do underwriters actually accept?
Compensating factors are what let a file clear a ratio it wouldn't clear on paper alone, and they're not a judgment call. HUD publishes the list for FHA manual underwriting, and it's short:
- Verified cash reserves after closing, backed by statements.
- Minimal increase in housing payment. If the new payment is close to the rent you've paid on time, that counts.
- Residual income: what's left each month after every debt and the new payment, measured against VA's regional tables.
- Significant additional income not counted as effective income: support that hasn't hit the history mark yet, overtime without a two-year record, a second job under a year old. It can't go in the ratio, but it can justify the ratio.
One factor moves an FHA manual file from 31/43 to 37/47; two get to 40/50. On VA, residual income 20% above the table is the strongest single factor there is. Three of the four are about cash and payment history, not income. I see this all the time: a one-income buyer with six months of reserves and a rent history that matches the new payment is a stronger file than a two-income buyer with neither.
Can a parent or family member co-sign the mortgage?
Yes, through what the guidelines call a non-occupant co-borrower, and the rules are specific enough that the wrong program choice costs real down payment.
- FHA: a co-borrower who is not a family member caps the loan at 75% of value, meaning 25% down. A family member (parent, grandparent, sibling, aunt or uncle, in-law, adult child, or domestic partner, per HUD's definition) keeps the loan at 96.5%, the standard 3.5% down, unless the family member is also the seller or the property has two to four units.
- Conventional (Fannie Mae B2-2-04): the co-borrower's income counts. On a Desktop Underwriter approval the loan tops out at 95% of value (5% down); on a manual file it's 90%, and the occupying borrower's own DTI, without the co-borrower, cannot exceed 43%.
- HomeReady: a non-occupant co-borrower is permitted, but that same 95% cap applies, so the 3% down program and the co-signer path don't combine. Home Possible handles it differently, one reason we compare both.
Say this out loud to whoever is co-signing: they're on the note, on the title, and on the hook, and a late payment is late on their credit too. I've seen this bridge a thin income history, and I've seen it strain a family. Everyone should understand that before anyone signs.
What should you do before you apply?
Three moves. If you receive support, pull the order and check its end date against the three-year rule. Gather 6 to 12 months of bank statements showing the deposits, because the history requirement is where most support income gets thrown out. Then get fully pre-approved, not pre-qualified, before you shop; I explained the difference in the pre-approval edge.
If a lender already told you no, ask which number failed. In my experience it's usually one lender's overlay or one input nobody optimized, like uncounted support income or a car loan that could have been paid off. With 100+ lenders, I can usually find the shop whose floor matches the guideline instead of sitting above it.
FAQ
Can I get a mortgage on one income? Yes. No program requires two incomes. The file qualifies on documented income against debts and credit, like any other borrower.
How long does child support have to continue to count for a mortgage? At least three years from the loan date under both Fannie Mae and FHA rules, plus a receipt history: six months for conventional, three months for court-ordered support on FHA (six if voluntary).
Can my parents co-sign an FHA loan? Yes. With a family-member co-borrower, FHA allows the standard 3.5% down. A non-family co-borrower limits the loan to 75% of value.
Are there mortgage programs specifically for single mothers? None of the agency programs (Fannie Mae, Freddie Mac, FHA, VA) sets eligibility by family status, and a lender can't treat your application differently because of it. What exists are low-down-payment programs and income-based assistance that one-income buyers often qualify for.
Run the Ratio Both Ways
Knowledge is power, and math is what I do. Send me your income, your monthly debts, the state you're buying in, and your support order if you want that income counted, and I'll run the DTI with and without support income, check the continuance dates, and tell you which programs and which state assistance your numbers point toward. No credit pull for that first look (a pre-approval needs a credit report), and no obligation. Call or text (949) 990-6030, or schedule a call.
Disclosures: Randy Mathis, NMLS #1516760 | DRE #02236644. Lumin Lending, Inc., NMLS #2716106 | DRE #02291443. Equal Housing Opportunity. Licensed in AL, AZ, CA, CO, FL, ID, MD, MI, OR, PA, TN, TX, UT, VA, WA. This article is educational and is not a commitment to lend, a rate quote, or an APR disclosure. All dollar figures are illustrative examples only, not an offer of credit or a representation of terms available to any borrower; your rate, APR, payment, and qualifying ratios depend on your individual situation and are subject to credit approval, income and property qualification, and program terms. Program requirements, income limits, and assistance amounts are quoted as of their stated dates from the sources below and change; state assistance programs are offered by their sponsoring agencies through participating lenders and are not Lumin Lending products. Lender overlays vary. Tax treatment of support income is general information, not tax advice; consult your tax professional. Sources: HUD Handbook 4000.1 (revised November 26, 2025); Fannie Mae Selling Guide B3-3.4-02 and B3-3.1-01 (March 4, 2026), B3-6-02 (April 2, 2025), B2-2-04, B5-6-01, B5-6-02; Freddie Mac Home Possible product page; VA Lenders Handbook (Pamphlet 26-7) Chapter 4; 24 CFR 100.20 and 100.120; 12 CFR 1002.6; Arizona IDA Home Plus program pages (income limit as of April 6, 2026); CalHFA MyHome program page and income limits effective June 30, 2026; TSAHC Home Buyer Programs page. Information current as of September 14, 2026.
