Can Two Friends Split the Mortgage Interest Deduction?
You and your friend bought a house together.
You share the mortgage, split the property expenses, and contribute to the same account every month.
Everything seems straightforward until tax season.
Your lender sends out Form 1098, the document showing how much mortgage interest was paid during the year.
But there’s a problem.
Only your friend’s name appears on the form.
Does that mean your friend gets to claim the entire mortgage interest deduction?
Can you both claim half?
And what if one of you would benefit more from claiming the full amount?
These are important questions for anyone buying a home with a friend, sibling, or unmarried partner.
The good news is that the IRS provides specific guidance on how unmarried co-owners should handle shared mortgage interest and property taxes.
Understanding those rules can help you avoid reporting mistakes and establish better financial practices throughout your co-ownership.
Can Two People Claim Mortgage Interest on the Same House?
Yes. Two unmarried people can potentially claim mortgage interest deductions relating to the same jointly owned home.
However, each person must satisfy the applicable tax requirements.
The IRS explains that individuals generally must be legally obligated to pay the expense and must have actually paid it.
When two eligible co-owners divide mortgage expenses, each may deduct their qualifying share.
For example, if you and your friend equally share the mortgage interest on your jointly owned home, you may each be eligible to deduct half of the qualifying interest.
That does not mean each of you can claim the full amount.
According to the IRS guidance for unmarried co-owners, taxpayers who are jointly responsible for a mortgage and pay equal portions from a jointly owned account should generally divide the eligible deduction accordingly. IRS
But there’s another important requirement.
You Must Itemize to Claim the Mortgage Interest Deduction
The mortgage interest deduction is generally an itemized deduction.
That means it is claimed through Schedule A of an individual federal income tax return.
Taxpayers typically compare their allowable itemized deductions with the standard deduction available for their filing status.
For the 2026 tax year, the standard deduction for a single filer is $16,100, before any additional standard deduction amounts for qualifying age or blindness.
If a person’s total eligible itemized deductions are lower than their applicable standard deduction, taking the standard deduction may provide a greater federal income tax benefit. IRS
Therefore, having deductible mortgage interest does not automatically mean claiming it will reduce your tax bill.
How Do Unmarried Co-Owners Split the Mortgage Interest Deduction?
Let’s use a practical example.
Maya and Jordan are longtime friends who purchased a home together.
Both names appear on the deed and mortgage.
They agreed to divide the housing expenses equally.
Throughout the year, each contributes toward the mortgage payment through a shared bank account.
At the end of the year, their lender issues Form 1098 showing:
Total qualifying mortgage interest paid: $18,000.
Maya paid half.
Jordan paid half.
Assuming both satisfy the applicable deduction requirements, the allocation would look like this:
| Expense | Maya | Jordan | Total |
| Mortgage interest paid | $9,000 | $9,000 | $18,000 |
| Share of qualifying interest | 50% | 50% | 100% |
| Potential itemized mortgage interest deduction | $9,000 | $9,000 | $18,000 |
These amounts represent potentially deductible expenses before applying relevant limitations.
They are not guaranteed reductions in tax owed.
Each person would need to determine whether itemizing is beneficial and whether other tax rules limit their deduction.
What if One Co-Buyer Pays More Than the Other?
Now suppose the arrangement changes.
Maya pays 70% of the mortgage expenses.
Jordan pays 30%.
During the year, the mortgage generates $20,000 of qualifying interest.
If both are eligible, legally responsible for the interest, and their documented payments follow that allocation, their potential deductions could be:
| Co-Buyer | Contribution | Potential Share of Interest |
| Maya | 70% | $14,000 |
| Jordan | 30% | $6,000 |
| Total | 100% | $20,000 |
The important distinction is that the tax allocation should reflect qualifying expenses actually paid.
It should not simply be based on which person has the higher income or would receive the greatest tax advantage.
What Happens if Form 1098 Is Only in One Co-Owner’s Name?
This is one of the most common sources of confusion.
Form 1098 is a mortgage interest statement issued by the lender.
It generally reports mortgage interest paid during the year.
However, when two unmarried people share one mortgage, the lender may issue the statement under only one borrower’s name and taxpayer identification number.
That does not automatically mean the named borrower is entitled to the entire deduction.
Example: Maya Receives Form 1098
Suppose Maya and Jordan each paid $9,000 of qualifying mortgage interest.
The lender sends Form 1098 to Maya.
The form shows the combined $18,000.
Maya should not assume that she can claim the full amount simply because she received the document.
Under the IRS’s current guidance, Maya would report her eligible portion as mortgage interest reported on Form 1098.
Jordan, who did not receive the form, would generally report his eligible portion as mortgage interest not reported to him on Form 1098.
The IRS FAQ identifies Schedule A line 8a for the recipient’s eligible interest and line 8b for the other qualifying co-owner’s interest.
The co-owner who did not receive Form 1098 must also provide the required identifying information about the person who received it.
For paper returns, additional explanatory information may be necessary.
These details should be checked against the instructions for the tax year being filed. IRS
What Records Should Co-Buyers Keep?
You and your co-buyer should maintain records showing how the mortgage expenses were paid.
Useful documentation includes mortgage statements, Form 1098, bank records, payment confirmations, and a record of each person’s contributions.
The IRS also recommends keeping records related to the original mortgage, how the borrowed funds were used, and how interest and property tax payments were divided.
For co-buyers, having a consistent recordkeeping process makes these requirements easier to manage.
Can One Co-Owner Claim All the Mortgage Interest?
Sometimes, one person may be eligible to claim all the qualifying interest if that person was legally responsible for the expense and actually paid all of it.
But two people cannot simply decide to allocate the entire deduction to whichever person would benefit most.
Consider Maya and Jordan again.
Both own the home.
Both are responsible for the mortgage.
Both contribute equally toward the payments.
Maya earns more money than Jordan.
They realize Maya might benefit from itemizing while Jordan would prefer the standard deduction.
Can they agree that Maya will claim the full mortgage interest amount?
Not merely because that arrangement produces a more favorable tax outcome.
Their deductions must reflect the underlying facts, including who was legally responsible and who actually paid the qualifying expenses.
The IRS specifically addresses shared accounts funded equally by unmarried co-owners and explains that the deductible expenses should be divided according to their respective payments. IRS
If your financial arrangement involves unusual reimbursement terms, unequal contributions, or one person making payments on behalf of another, consult a qualified tax professional before deciding how to report the expenses.
Do Ownership Percentages Determine Your Tax Deductions?
Not necessarily.
The percentage of a home that someone owns and the percentage of mortgage expenses they pay can be different.
Imagine two siblings buying a property together.
Alex contributes more toward the down payment.
Taylor expects to cover a larger share of the ongoing mortgage payments.
They agree that Alex will hold a 60% ownership interest and Taylor will hold 40%.
But during the year, Taylor pays 60% of the mortgage interest while Alex pays 40%.
That creates two separate considerations:
Ownership percentage: How much of the property belongs to each person?
Expense contribution: Who actually pays each qualifying expense?
The IRS’s guidance on mortgage interest deductions focuses on qualifying expenses, legal responsibility, and payment, rather than simply assigning deductions according to the percentages on the deed.
Other rules can apply to unusual ownership or borrowing arrangements.
This is one reason co-buyers should understand how tenancy in common works and properly document their separate ownership and financial obligations.
A clear ownership agreement can establish how expenses are divided, even though the agreement itself does not determine anyone’s federal tax eligibility.
Can Co-Buyers Split Property Tax Deductions?
Potentially, yes.
Mortgage interest isn’t the only expense that may qualify for an itemized deduction.
Certain state and local real estate taxes can also be deductible, subject to applicable limitations.
The IRS explains that qualifying real estate taxes actually paid to the taxing authority may be included among eligible homeowner deductions.
However, not every charge appearing on a mortgage statement or local property bill qualifies.
The property tax deduction is also subject to federal rules limiting deductions for state and local taxes. IRS
Example: Two Friends Splitting Property Taxes
Maya and Jordan jointly own a home.
Their qualifying real estate taxes for the year total $6,000.
Each contributed equally toward those taxes.
Assuming both meet the relevant requirements, each may have $3,000 of property tax expenses potentially available as an itemized deduction.
The amount each can ultimately deduct depends on the applicable federal limitations and their individual tax circumstances.
Does It Matter if Property Taxes Are Paid Through Escrow?
Not necessarily.
Many mortgage payments include an escrow component for property taxes and homeowners insurance.
The mortgage servicer collects funds throughout the year and uses them to pay certain property expenses when due.
For tax purposes, it’s important to distinguish between money deposited into escrow and qualifying property taxes actually paid.
Co-buyers should review the mortgage servicer’s annual escrow statement to understand the amounts paid to taxing authorities during the relevant year.
Which Homeownership Expenses Are Deductible?
A mortgage payment contains different types of expenses.
Some may qualify for deductions.
Others generally do not.
| Homeownership Expense | General Federal Tax Treatment |
| Qualifying mortgage interest | Potentially deductible when itemizing, subject to limits |
| Qualifying real estate taxes | Potentially deductible when itemizing, subject to limits |
| Mortgage principal payments | Not deductible as home mortgage interest |
| Homeowners insurance premiums | Generally not deductible for a personal residence |
| HOA fees | Generally not deductible for a personal residence |
| Utilities | Generally not deductible as personal homeownership expenses |
| Ordinary home repairs | Generally not currently deductible for a personal residence |
| Qualifying mortgage points | May be deductible under specific rules |
These descriptions concern personal-use homes. Rental, business-use, and other special situations can have different tax treatment.
The IRS provides additional information in Publication 530, Tax Information for Homeowners.
For co-buyers, the distinction matters because all housing expenses should be budgeted, even when some are not tax-deductible.
You should also understand how homeowners insurance works for co-buyers, particularly when multiple people appear on the deed.
Does Splitting the Mortgage Interest Deduction Always Save Money?
No.
A deduction reduces taxable income when claimed and allowed. It does not provide a dollar-for-dollar reduction in taxes.
And because mortgage interest is generally an itemized deduction, the benefit depends on each person’s broader tax circumstances.
Example: The Standard Deduction May Be Better
Suppose Maya and Jordan are both single taxpayers under age 65 who do not qualify for an additional standard deduction amount.
Each has the following potentially itemizable housing expenses:
| Expense | Maya | Jordan |
| Qualifying mortgage interest | $9,000 | $9,000 |
| Qualifying property taxes | $3,000 | $3,000 |
| Total housing-related deductions before applicable limits | $12,000 | $12,000 |
For 2026, the standard deduction for each single filer is $16,100.
If neither has other itemized deductions, taking the standard deduction would generally provide a greater deduction.
However, additional eligible expenses could change the comparison.
The practical lesson is simple: Do not assume that purchasing a home automatically creates a federal income tax benefit.
Understand the potential deduction, but evaluate it within your complete tax situation.
Benefits and Risks of Sharing Mortgage Expenses With a Co-Buyer
Sharing homeownership expenses can make purchasing and maintaining property more manageable.
However, it also creates responsibilities that extend beyond the monthly mortgage payment.
Potential Benefits
Shared purchasing resources
Co-buyers may be able to combine available funds and qualifying income to explore homeownership options.
Divided housing expenses
Mortgage payments, property taxes, insurance, and ongoing maintenance costs can be divided according to a documented agreement.
Clear financial records
A consistent expense-sharing process can make it easier to track contributions and prepare supporting documents for tax reporting.
Greater financial transparency
Discussing expenses before buying can help co-buyers understand each other’s expectations and financial responsibilities.
Risks to Consider
Incorrect tax reporting
One owner may mistakenly claim deductions that should be divided.
Poor documentation
Shared bank accounts can become difficult to reconcile when contributions change throughout the year.
Unequal contributions
A co-buyer may temporarily cover another person’s expenses without establishing how the payment should be treated.
Different tax circumstances
One person may benefit from itemizing while the other does not.
Confusion between ownership and expenses
Co-buyers may assume their ownership percentages automatically determine every financial obligation.
These issues reinforce the importance of agreeing on financial responsibilities before purchasing.
How Should Co-Buyers Organize Their Mortgage and Tax Records?
The best approach is to establish a process that works throughout the year.
1. Create a Shared Expense Plan
Agree on how mortgage principal, interest, property taxes, insurance, and maintenance expenses will be divided.
Keep the arrangement documented.
2. Track Each Person’s Contributions
If you use a joint bank account for property expenses, maintain records showing how much each person contributes.
Avoid relying on memory when preparing tax returns months later.
3. Review the Mortgage Statement
Understand which portion of each payment goes toward principal, interest, and escrow.
Those amounts have different financial and tax implications.
4. Reconcile Expenses at Year-End
When Form 1098 and the annual escrow statement become available, compare them with your payment records.
Identify what each person actually paid toward potentially deductible expenses.
5. Review Your Tax Positions Separately
Co-buyers who are not married generally prepare separate federal income tax returns.
Each person should determine whether itemizing makes sense based on their own circumstances.
6. Put Your Financial Arrangements in Writing
A written co-ownership agreement can establish expectations around financial contributions, expense sharing, reimbursements, and unexpected circumstances.
Pairgap’s co-buying financial checklist provides a broader starting point for organizing a shared purchase.
What This Means for Co-Buyers
When friends or family members buy property together, their responsibilities continue long after closing.
Mortgage payments, property taxes, insurance, repairs, and financial recordkeeping all become part of managing the home.
Tax preparation is another responsibility that co-buyers should plan for.
Three principles are especially important.
First, know who is paying what.
An ownership agreement should establish each person’s financial responsibilities, and payment records should reflect what actually happens.
Second, understand the difference between paying an expense and claiming a deduction.
A co-buyer may contribute toward a mortgage without necessarily qualifying for a particular tax benefit.
Third, make financial decisions together while recognizing individual tax responsibilities.
Your co-buying partnership may be shared, but your tax circumstances can be very different.
A structure that works for the mortgage should also make it possible to maintain accurate records.
Co-buyers should discuss these details before buying, revisit them when contributions change, and seek professional guidance when necessary.
Frequently Asked Questions
1. Can two unmarried people both deduct mortgage interest?
Yes, potentially. If both are eligible, legally responsible for the qualifying expense, and each pays part of the interest, they may each claim their eligible share when itemizing deductions.
2. Can one person claim all the mortgage interest if both people own the house?
Not simply because the owners agree to that arrangement.
The IRS generally looks at the taxpayer’s legal responsibility for the expense and whether the taxpayer actually paid it.
One person receiving Form 1098 does not automatically entitle them to deduct the entire amount.
3. What if only one person receives Form 1098?
The co-owner who receives the form reports their eligible portion as instructed by the IRS.
The other eligible co-owner can generally report their qualifying share as mortgage interest not reported to them on Form 1098.
The IRS requires appropriate identifying information and, in certain filing situations, explanatory documentation.
4. Can friends split property tax deductions?
Potentially, yes.
If both are eligible and each pays part of the qualifying property taxes, they may each claim their allowable portion when itemizing.
Federal limitations on state and local tax deductions may apply.
5. Does a 50/50 ownership split mean both people must claim half the mortgage interest?
Not automatically.
The tax allocation depends on the qualifying expenses each person was legally responsible for and actually paid.
Ownership percentages and payment contributions can differ.
6. Is a joint bank account necessary for co-buyers to claim mortgage interest deductions?
No. A joint account is not itself a requirement for the deduction.
What matters is whether the taxpayers satisfy the relevant tax rules and can substantiate their qualifying payments.
A joint account can help organize property expenses, but co-buyers should keep records showing each person’s contributions.
7. Do co-buyers need an accountant to split their mortgage interest deduction?
Not every co-buying arrangement requires professional tax assistance.
However, a qualified tax professional can be particularly helpful when contributions are unequal, the owners have different tax circumstances, one person is not on the mortgage, or the property has rental or business use.
Tax rules can be complex, and proper reporting depends on the specific arrangement.
Build a Clear Financial Plan Before You Co-Buy
Sharing a home means sharing financial decisions that affect both buyers.
Before purchasing together, agree on how you’ll divide the mortgage, property taxes, insurance, maintenance, and other financial responsibilities.
You should also decide how to handle unequal contributions, unexpected expenses, disagreements, and future changes to your ownership arrangement.
Pairgap’s Real Estate Prenup helps co-buyers work through these decisions and put their expectations in writing, creating a structured agreement for appropriate legal review.
Ready to establish clear financial responsibilities with your co-buyer? Explore the Pairgap Real Estate Prenup.
This article provides general educational information about U.S. federal tax rules and shared homeownership. It is not individualized tax, legal, or financial advice. Applicable deductions depend on each taxpayer’s circumstances and current law. Consult a qualified tax professional about your specific situation.
