The pros and cons of co-buying a house with friends

Written by Samantha SheltonNMLS 1647301Updated November 2026

Co-buying a home with friends pools incomes and down payments so you can qualify for more house and split every cost, but each co-borrower is legally responsible for the entire mortgage, not just their share, and one person’s missed payment damages everyone’s credit. On the conventional side, Fannie Mae’s Desktop Underwriter supports a maximum of four borrowers on a loan casefile, and when there’s more than one borrower, the representative credit score used for pricing is the lowest applicable score in the group.

The financial case is real. So is the legal exposure. Before buying, co-owners should sign a written co-ownership agreement covering ownership shares, expenses, exit strategy and dispute resolution, and choose their title vesting deliberately.

Learn more about the pros and cons of co-buying a house with friends, including how lenders underwrite a group, how to hold title, and what belongs in a co-ownership agreement. If you’re earlier in the process, start with our Home Buying guide.

Key takeaways:

• Co-buying multiplies buying power: Combined incomes and savings can turn two priced-out buyers into qualified ones, and Fannie Mae’s Desktop Underwriter supports up to 4 borrowers on a single loan casefile.
• Liability is joint and several: Every co-borrower owes 100% of the mortgage payment rather than a share, so a friend’s job loss or missed payment hits your credit exactly as hard as it hits theirs.
• A written co-ownership agreement is non-negotiable: Settle all 6 essentials, ownership percentages, cost splits, repair rules, buyout and forced-sale terms, default remedies and dispute resolution, before anyone signs a purchase contract.

Why are friends buying houses together?

Because two incomes clear a qualifying bar one income can’t, and lenders have no relationship requirement. Nothing in conventional underwriting says co-borrowers must be married or related. The group is underwritten as one file: everyone’s income, everyone’s debts, everyone’s credit.

There is a practical ceiling. Fannie Mae’s Desktop Underwriter supports a maximum of four borrowers on a single loan casefile; a larger group must be underwritten manually, which narrows the lenders willing to touch it. Four is the number most co-buying groups plan around.

Two versions exist. Co-occupants are two to four friends who will live in the home, usually on a 3 to 7 year horizon. Co-investors buy a property they won’t occupy, which changes the financing and the tax treatment. Our guide to co-buying a home with family or friends covers the loan mechanics in more depth.

What’s different about friends: there’s no legal framework underneath the relationship the way marriage sits underneath a couple. Everything you’d inherit from family law, you have to write down.

How common is buying a home without a spouse?

According to the National Association of Realtors’ 2025 Profile of Home Buyers and Sellers, released November 4, 2025 and covering purchases from July 2024 to June 2025, first-time buyers fell to a record low of 21% of all buyers, and the typical first-time buyer was 40 years old (NAR release). The same survey reported a 10% median down payment for first-time buyers against 23% for repeat buyers, and 22% of first-time buyers drew on gifts or loans from family and friends. Our guide to financing a home purchase with gift funds covers how lenders document that money.

A Fox Business report published January 25, 2026 summarized the household makeup in the same NAR profile: married couples were 61% of all buyers, single women 21% and single men 9% (FOX 2 Detroit). That leaves 9% of all buyers for every other household type, and neither the release nor the report breaks out friends buying together.

The U.S. Census Bureau’s Housing Vacancy Survey, released October 28, 2026, put the median asking sales price of vacant for-sale homes at $353,600 in the third quarter of 2026 and the median asking rent for vacant rentals at $1,541 a month, with the national homeownership rate at 65.5% (Census Bureau, third quarter 2026). For example, two friends each renting at that median asking rent would pay $3,082 a month between them; the rent vs. buy calculator compares a figure like that with your own costs to own.

What are the pros of co-buying a house with friends?

The advantages are almost entirely financial, and they compound: a bigger qualifying income, a bigger down payment, and a monthly cost that splits for as long as you own the place.

Two incomes qualify for more house than one

Lenders underwrite the group’s combined qualifying income against its combined monthly obligations. Say Maya and Devon each earn $52,000 a year and have $18,000 saved. Alone, neither has the income or the cash for the $310,000 house they want. Together they bring $104,000 of qualifying income and $36,000 in cash, enough for a 5% down payment of $15,500, closing costs, and a reserve left over.¹

Pooled savings can also clear the down payment hurdle without an assistance program, though see buying a home with a low down payment for what’s available at 3% to 5% down.

Every recurring cost splits

The mortgage payment is the obvious one and the smaller half of the benefit. Property taxes, insurance, utilities, lawn care, and the water heater that dies in February split too. A $9,000 roof is a crisis for one buyer and a $3,000 line item each for three.

You build equity together instead of paying rent

Every payment retires principal, and appreciation accrues to owners rather than a landlord. Split by ownership percentage, that’s real wealth-building for people who couldn’t otherwise start.

More property types come into reach

A group buying a two- to four-unit building it will live in is treated as an owner-occupant, not an investor. Fannie Mae raised the maximum LTV, CLTV and HCLTV for two- to four-unit principal residence purchase and limited cash-out transactions to 95% in Desktop Underwriter Version 11.1, effective for casefiles submitted or resubmitted on or after the weekend of November 18, 2023. In plain terms: 5% down on a duplex you occupy. It excludes high-balance and manually underwritten loans.

Shared tax treatment with a real asterisk

Mortgage interest and property taxes are generally deductible by the person who actually paid them and is legally obligated on the debt, so co-owners don’t automatically split the deduction just because they split the payment. How it lands depends on your ownership structure, who pays what, and whether anyone itemizes. Price it out with a tax professional first.²

What are the risks of co-buying a house?

Your obligation is not a share. A note signed by more than one borrower creates joint and several liability: the lender can pursue any one borrower for the entire balance, not 50%, not 33%, all of it. Your friend’s half is also your half if they stop paying.

One person’s missed payment is everyone’s late payment

The loan reports to every borrower’s credit file. A single 30-day late lands on all the co-borrowers’ reports identically, regardless of who was supposed to send the money, and there’s no mechanism to note that you paid your part. That’s why the reserve fund below isn’t optional.

The whole payment counts against each person’s DTI

Lenders generally count the full mortgage payment as a monthly obligation for every borrower on the note. So when you finance a car two years later, that entire payment sits in your ratio even though a friend pays part of it. The CFPB explains how debt-to-income ratios work and why they cap what you can borrow.

The ceilings are firm. For casefiles underwritten through Desktop Underwriter, Fannie Mae’s maximum allowable DTI ratio is 50%. Manually underwritten loans cap at 36% of stable monthly income, reaching 45% only when the borrower meets the credit score and reserve requirements in Fannie Mae’s Eligibility Matrix.

The group’s pricing follows the lowest credit score

Fannie Mae determines each borrower’s individual representative score, then selects the lowest applicable score from the group as the representative credit score for the loan, and that score is used for pricing on all loans. Certain manually underwritten multi-borrower transactions use an average median credit score to test eligibility, but the representative score still drives pricing.

Practically: a friend with a 620 raises the cost of the loan for a friend with a 780. Have that conversation before you tour, not after you’re under contract.

Getting out is harder than getting in

Removing a co-borrower almost always requires a refinance, meaning the remaining owners have to qualify on their own income. The exact thing they couldn’t do in the first place. Selling requires everyone to agree on timing and price. If they don’t, a co-owner’s remaining remedy in most states is a partition action: asking a court to order the property divided or sold. Slow, expensive, friendship-ending.

Financing narrows, and some properties add a gatekeeper

Not every lender is comfortable with four borrowers and unequal contributions, which is when shopping one scenario across many lenders matters most. Groups shut out of conventional financing sometimes look at seller financing instead. And if the property is a co-op, the building’s board votes on your group first, see navigating co-op board approvals.

Does FHA judge a group by its weakest credit score too?

Yes. HUD’s Mortgagee Letter 2026-11, dated October 8, 2026 and effective for FHA case numbers assigned on or after January 1, 2027, defines the Minimum Decision Credit Score as the bottom borrower-level score among all borrowers on the transaction. When the lender submits more than one score model, such as Classic FICO, FICO 10T or VantageScore 4.0, each borrower’s score is the smallest across the models submitted, and according to the letter the same model types must be used for every borrower.

If one friend has no credit score at all, HUD’s letter says the decision score comes from the borrowers who do have scores, using the bottom one. Borrowers with non-traditional or insufficient credit must be manually underwritten, and in that case the qualifying ratios use income only from borrowers who occupy the property and are obligated on the mortgage: a non-occupant co-borrower’s income may not be included.

Source: HUD Mortgagee Letter 2026-11, October 8, 2026, effective for case numbers assigned on or after January 1, 2027. Align Lending is not affiliated with HUD or FHA and is not acting on behalf of either agency.

So for FHA too, the weakest score sets the tier for everyone. Our guide to what counts as a good credit score to buy a house covers how those scores are built.

How do unmarried co-owners report mortgage interest at tax time?

Each one reports only the interest they paid, and the friend whose name is not on the lender’s Form 1098 has extra paperwork. According to IRS Publication 936 (for 2025 returns), if you and at least one other person, other than a spouse on a joint return, were liable for and paid interest on a mortgage for your home, and the other person received the Form 1098, you attach a statement to your paper return showing how much of the interest each of you paid.

Publication 936 also sets the limit on deductible mortgage debt secured after December 15, 2017: $750,000, or $375,000 if married filing separately. Friends who will rent the property out rather than live in it face different rules; see tax benefits of real estate investing.

How co-buying changes the friendship

Every co-buying story that goes badly goes badly for a reason someone could have named in advance. The financial risks are quantifiable. The relational ones get skipped.

• Money conversations become permanent: You’ll discuss dollars with this person monthly for years. If the friendship has never survived a conversation about who owes what for dinner, a mortgage is a large first test.
• Privacy compresses: Roommate friction and co-owner friction feel identical and carry different stakes. You can move out of a lease. You can’t move out of a deed.
• Life timelines diverge: A job in another state, a partner moving in, a baby. Any of these arrives for one owner and not the others. Assume at least one happens inside five years.
• Improvement standards differ: One owner wants a $22,000 kitchen; the other wants the money in savings. Without a spending threshold that triggers a vote, that argument recurs.

None of this argues against co-buying. It argues for deciding these things while everyone still likes each other.

Tenancy in common vs. joint tenancy: which fits friends?

Most friend co-buyers hold title as tenants in common, because it’s the vesting that lets ownership shares be unequal, a 60/40 split matching who brought what. The alternative, joint tenancy with right of survivorship, splits ownership equally and passes a deceased owner’s share automatically to the surviving co-owners, which usually fits spouses better.

Two things people routinely get wrong. First, vesting rules are set by state law and the details vary, so this is a question for a real estate attorney, not a form you check at the closing table. Second, title and the loan are separate: being on the mortgage without being on the deed means carrying the liability with none of the ownership. Decide both, deliberately, in writing. The American Land Title Association is a useful primer on how title and settlement work.

How does co-buying with friends work in Michigan?

Michigan has four forms of co-ownership, and the deed’s words pick one

According to Michigan Legal Help, Michigan property can be held as tenants in common, joint tenants, joint tenants with full rights of survivorship, or tenants by the entireties, the last only for spouses. A deed to two or more people who are not married to each other, with no mention of joint tenancy or survivorship, creates a tenancy in common, so friends who say nothing on the deed end up there by default. Joint tenancy with full rights of survivorship is stricter than the general rule in the table above: Michigan Legal Help says no owner can sell or transfer their interest without the consent of the other joint tenants.

The same source describes Michigan’s 120-hour rule: a co-owner must live more than 120 hours after the other owner dies for survivorship rights to take effect, unless a will, deed or trust sets a different rule.

A friend is not an heir unless the paperwork says so

Under MCL 700.2103, the part of an estate that does not pass to a surviving spouse goes first to the person’s descendants, then to their parents, then to the parents’ descendants. A co-owning friend is not on that list. With a tenancy in common, Michigan Legal Help says each owner’s share passes to their estate, so without a will the surviving friends could end up co-owning with a parent or sibling.

Partition is the court route when owners deadlock

MCL 600.3304 says all persons holding land as joint tenants or, subject to chapter 34, as tenants in common may have it partitioned. Chapter 34 is Michigan’s Uniform Partition of Heirs Property Act, added by 2024 Public Act 215 and effective April 2, 2025. Its definition of heirs property in MCL 600.3402 applies only to a tenancy in common with no agreement in a record binding all the cotenants that governs partition, where a cotenant took title from a relative and one of three 20% tests tied to relatives is met, such as relatives holding 20% or more of the interests. That can describe a friends’ house once a share passes to an owner’s family. A written co-ownership agreement that governs partition takes the property outside that definition.

A buyout can reset part of the property tax

In Michigan, a home’s taxable value is capped while one owner holds it. The year after it sells, that cap comes off and taxable value resets to the state equalized value, which is half of the assessor’s estimate of market value, not automatically half of what you paid. Under MCL 211.27a, a transfer of property held as a tenancy in common counts as a transfer of ownership except for the portion not subject to the interest conveyed, so when one friend buys out another, only the share that changed hands counts as transferred. Ask the local assessor how a planned buyout will be handled; the Michigan property tax uncapping study shows what the reset has meant for buyers.

The deed becomes a county record

Whatever vesting you choose is recorded with the county register of deeds. Oakland County’s Register of Deeds, for example, says its office creates a public record for all land in the county, and its Super Index returns copies of recorded documents dating back to January 1, 1964 (Oakland County). After closing, pull the recorded deed and confirm the names and vesting words match your agreement; our guide to choosing a title company covers who prepares and records it.

The co-buying checklist: 5 steps before anyone signs

Do these in order. Step one saves the friendship, and it belongs before the house hunt.

1. Write the co-ownership agreement first

Have a real estate attorney draft it before you write an offer, and make sure it covers all of the following:

• Ownership percentages: Who owns what share, and how down payment, closing costs and renovation money map to those percentages.
• Monthly cost splits: Mortgage, taxes, insurance, utilities, HOA dues, and who sends the payment.
• Repair and improvement rules: A dollar threshold above which spending requires unanimous consent, plus a rule for emergencies nobody has time to vote on.
• Buyout and forced-sale terms: How a departing owner’s share is valued, how long the others have to buy it, and the notice period after which any owner can require the property be listed.
• Default remedies: What happens the first month someone doesn’t pay, who covers it, and how it adjusts their equity.
• Dispute resolution and death: Mediation or binding arbitration before anyone can file a partition action, and what surviving owners can do if a share passes to heirs.

2. Compare everyone’s credit, then get preapproved as a group

Pull all the reports and scores in the same week and read them side by side, because the lowest score in the room prices the loan. Then get one preapproval covering every borrower who will sign. Individual preapprovals say almost nothing about what the group can buy. The CFPB’s home-buying resources cover what lenders verify.

3. Choose your vesting with an attorney

Take the agreement to the attorney and have the vesting match it. If the agreement says 60/40 and the deed says equal shares, the deed is what a court reads first.

4. Fund a shared reserve before you close

Open a joint account for the house and fund it at closing, three to six months of the full housing payment, plus a repair cushion. That’s what covers a friend’s rough quarter without anyone’s credit taking a hit.

5. Write the exit before you need it

Name the likely exits now: a job out of state, a partner moving in, someone wanting their money out. For each, decide the notice period, the valuation method, and whether a refinance or a sale follows. An exit plan written by friends is a paragraph. One written by lawyers afterward is a lawsuit.

Co-buying is one of several ways into a house a single income can’t reach, the full set lives in our Buying Strategies & Situations hub.

What does it cost when one friend wants out?

Continuing the Maya and Devon example from above, here is how a five-year exit could look if they held title as tenants in common, 50/50.

Hypothetical example, not an offer.

Sources: state transfer tax of $3.75 for each $500 of value under MCL 207.525; county tax of 55 cents for each $500 in a county with a population under 2,000,000 under MCL 207.504. Every other figure is hypothetical.

Two things move these numbers. First, the buyout works only if Maya can qualify alone for the new loan; our guide to refinancing to remove a co-signer walks through that refinance. Second, in the same hypothetical, had they split 60/40 to match contributions, Devon’s 40% buyout check would be $36,000 instead of $45,000, so the percentages in step 1 matter at the exit as much as at closing. Owners weighing a sale can test their own figures in the seller net sheet calculator and the Michigan transfer tax calculator.

FAQ: Co-buying a house with friends

Here are answers to common questions about co-buying a house with friends.

Can friends buy a house together and get a mortgage?

Yes. Friends can co-borrow just like spouses. Fannie Mae’s Desktop Underwriter supports up to four borrowers on a loan casefile, and each person’s income, debts and credit are underwritten together. There’s no requirement that co-buyers be related. The catch: everyone is fully liable for the whole payment, and the group’s pricing is driven by the lowest credit score among the borrowers. Start with a real preapproval for the whole group, and know the difference between being prequalified vs. preapproved before you make an offer.

What happens if one co-owner wants to sell or move out?

That’s exactly what a co-ownership agreement should predetermine. Common solutions include the remaining owners buying out the departing owner’s share (usually requiring a refinance to remove them from the loan), or a forced-sale clause after a notice period. Without an agreement, a co-owner can file a partition action asking a court to order the sale, an expensive, friendship-ending path. Any of these routes ends in a conveyance that has to be documented correctly.

How should friends hold title when buying a house together?

Most friend co-buyers choose tenancy in common, which allows unequal ownership shares (say 60/40 to match contributions) and lets each owner will their share to heirs. Joint tenancy with right of survivorship gives equal shares and passes ownership automatically to surviving co-owners at death, usually better suited to couples. A real estate attorney can match vesting to your agreement, and title insurance protects whichever structure you choose.

Does co-buying a house affect your credit and future borrowing?

Yes, significantly. The full mortgage payment appears on every co-borrower’s credit report and counts in each person’s debt-to-income (DTI) ratio, which can limit your ability to finance a car or another home later, even if a co-owner actually pays “your” share. On-time payments help everyone’s credit; a single 30-day late damages all borrowers equally.

Can friends buy a house together if only one of them will live in it?

Yes, on a conventional loan. Fannie Mae’s Selling Guide B2-2-04 (topic dated September 2, 2020) permits co-borrowers who will not occupy the home on purchases, and caps Desktop Underwriter files with one at a 95% loan-to-value ratio. That borrower signs the note and shares joint liability whether or not they are on title. Manual underwriting is tighter: 90% LTV when the non-occupant’s income is used, and a 43% DTI cap using occupants’ income only.

Do co-owners in Michigan all get the homestead exemption?

Only the owners who live there file. Treasury’s Principal Residence Exemption Guidelines (issued August 2021) say only the occupying owner signs the affidavit, Form 2368, and that a partial owner who occupies the home, even a 1% owner, receives a 100% exemption. The exemption removes the local school operating millage, up to 18 mills, per Michigan Treasury. The Michigan property tax calculator shows the homestead rate for an address.

Do lenders treat unmarried co-buyers differently than married couples?

They are not allowed to. Regulation B, at 12 CFR 1002.6(b)(8), says a creditor shall evaluate married and unmarried applicants by the same standards and, in evaluating joint applicants, shall not treat them differently based on the existence, absence or likelihood of a marital relationship between them. Friends applying together are measured by the same income, debt and credit rules a married couple faces.

What happens to the mortgage if a co-owner dies?

The loan generally stays in place on the same terms. Federal law, 12 U.S.C. 1701j-3(d), bars a lender from using a due-on-sale clause on a home with fewer than five units because of a transfer on the death of a joint tenant or a transfer to a relative resulting from a borrower’s death. A tenancy-in-common share left to a friend’s heirs fits the second exemption only when the heir is a relative, so call the servicer early.

The bottom line on co-buying with friends

Co-buying with friends works when the paperwork is as serious as the friendship. Pooled income and savings can turn two priced-out buyers into qualified ones, and conventional financing accommodates a group, Fannie Mae’s Desktop Underwriter supports up to four borrowers on a loan casefile. The trade is joint and several liability: every co-borrower owes the entire payment, the loan sits in everyone’s debt-to-income ratio, and the lowest credit score in the group prices the loan. Sign a co-ownership agreement covering shares, splits, buyouts and exits, and choose your vesting with an attorney before you write an offer.

If you’re ready to see what your group qualifies for, talk to Align Lending. We structure multi-borrower loans, model how each person’s credit affects the group’s pricing, and shop the scenario across our lender network so you see the numbers side by side. Call 248-506-5727 or start online.

Footnotes:

1. Example figures are hypothetical and for educational purposes only; they do not constitute an advertisement of credit terms or a rate quote under federal or state lending laws. Your qualifying income, required down payment, and terms will depend on your application, the property, the program, and market conditions. Return to text.

2. This article is for informational purposes only and is not intended to provide legal, financial, or tax advice. Deductibility of mortgage interest and property taxes depends on your ownership structure, who is legally obligated on the debt, who actually paid, and whether you itemize. Consult a qualified tax professional about your specific situation. Return to text.

Sources: maximum of four borrowers per Desktop Underwriter loan casefile, Fannie Mae Desktop Underwriter Job Aids. Representative credit score and average median credit score for multiple borrowers, Fannie Mae Selling Guide B3-5.1-02. Maximum allowable debt-to-income ratios, Fannie Mae Selling Guide B3-6-02 and the Fannie Mae Eligibility Matrix. 95% maximum LTV/CLTV/HCLTV for two- to four-unit principal residence purchase and limited cash-out transactions, Fannie Mae Desktop Underwriter Version 11.1 release, effective the weekend of November 18, 2023.

This article is for informational purposes only and is not intended to provide legal, financial, or tax advice. Co-ownership agreements, deeds, and title vesting are governed by state law and should be drafted and reviewed by a licensed attorney in your state. Consult a qualified professional about your situation. Program terms and figures shown are illustrative, are not a rate quote or an offer of credit, and are subject to change. Align Lending is an independent Michigan mortgage broker, NMLS #2041154.

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