Your lender already told the IRS exactly how much mortgage interest you paid last year. Every January, a copy of your Form 1098 goes to you and another goes straight to the IRS, where a matching program compares it against your return. If the interest number on your Schedule E does not reconcile with what your lender reported, you are not flying under the radar — you are queuing up an IRS notice. The good news: for landlords, nearly every dollar on that form is deductible. You just have to land each box on the correct line.
What Each Box on Form 1098 Means for a Landlord
Form 1098, the Mortgage Interest Statement, is furnished by your lender when you paid $600 or more in mortgage interest during the year. It should arrive by January 31. Here is how to read it through a rental-property lens.
Box 1 — Mortgage interest received. This is the headline number: the interest portion of your mortgage payments that the lender received from you during the calendar year. For a 100-percent rental property, this amount generally flows to Schedule E, line 12. Note what it is not: it excludes principal, escrow deposits, and fees. If you look at your total monthly payment and wonder why Box 1 is so much smaller, the rest was equity-building principal and escrow — neither of which belongs on line 12.
Box 2 — Outstanding mortgage principal. Your loan balance: the beginning-of-year balance, the end-of-year balance, or both, depending on the lender. You do not deduct this — it is informational. Still, glance at it. If the balance looks wrong, your interest figure may be wrong too, and catching a servicing error in February beats untangling it under audit.
Box 3 — Mortgage origination date. When the loan was made. Mostly informational for landlords, but it matters when you are amortizing points, because the amortization clock starts here.
Box 4 — Refund of overpaid interest. If the lender is returning interest you overpaid in a prior year, it shows up here. Do not deduct it — and if you deducted that interest in the earlier year, the refund may be taxable rental income in the year you receive it.
Box 5 — Mortgage insurance premiums. Premiums for private mortgage insurance (PMI) or FHA mortgage insurance premiums (MIP) you paid during the year. For rental property, these are generally deductible as an insurance expense on Schedule E, line 9 — a different line and a different tax logic than the homeowner deduction, as explained below.
Box 6 — Points paid on purchase. Points (loan origination fees charged for the use of money) reported here. The box label says "principal residence," but lenders report points here regardless of property type. Do not let the label push you into homeowner treatment: on a rental, points are almost never deductible all at once. They get spread over the life of the loan.
Boxes 7 through 11 — Property and loan identifiers. Box 8 gives the address of the property securing the mortgage — verify it matches your rental, especially if you own several mortgaged properties and the forms arrive in one stack. Box 9 shows how many properties secure the loan (a blanket loan across multiple rentals splits your allocation work). Box 10 ("Other") often carries helpful informational items such as the real estate taxes the lender paid out of your escrow account. Box 11 shows the mortgage acquisition date if the lender acquired your loan mid-year.
Where Each Number Lands on Schedule E
Think of Form 1098 as raw material and Schedule E as the finished layout. The mapping for a fully rented property:
- Box 1 interest → Schedule E, line 12 (Mortgage interest paid to banks and financial institutions).
- Box 5 mortgage insurance → Schedule E, line 9 (Insurance), deductible in the year paid.
- Escrow-paid property taxes shown in Box 10 → Schedule E, line 11 (Taxes). Deduct taxes in the year the lender actually paid them to the taxing authority, not the year you funded the escrow account.
- Box 6 points → amortized over the loan term, with each year's slice added to your interest deduction. The Schedule E instructions are explicit: points, including loan origination fees charged only for the use of money, must be deducted over the life of the loan.
Two tripwires deserve emphasis. First, never deduct prepaid interest in the year you paid it — it belongs only in the year to which it is properly allocable. Second, interest is deductible when paid, which for most cash-basis landlords means the calendar year the payment cleared.
Points Work Differently on Rentals — Amortize, Don't Expense
This is the single most misunderstood part of rental mortgage taxation. Homeowners who buy a principal residence can often deduct the full points amount in the purchase year if they meet a list of conditions. Landlords cannot. Points paid to obtain a mortgage on rental property are prepaid interest, and prepaid interest must be spread ratably over the life of the loan.
The math is straightforward. Pay $3,600 in points on a 30-year rental mortgage, and your annual deduction is $120 — $10 a month for 360 months. If you sell or fully pay off the loan early, any remaining unamortized balance is generally deductible in that final year. Refinancing works the same way for the old loan's leftover points: when the old loan is paid off, the unamortized remainder becomes deductible, while the new loan's points start their own amortization schedule.
One refinancing wrinkle to know about: if you refinance with the same lender, leftover points from the old loan are typically folded into the new loan's amortization schedule rather than deducted immediately. With a different lender, the old balance is deductible in the payoff year. Keep a simple amortization schedule for every loan — original balance of points, annual amount, remaining balance — and staple it, figuratively, to that property's tax file. Years from now, when you refinance or sell, that schedule is worth real money.
Other closing costs follow their own rules and mostly do not touch Schedule E at all. Mortgage commissions, abstract fees, and recording fees paid to obtain the loan are capital expenses that become part of your basis in the property — they reduce your gain at sale rather than your rental income today. Appraisal, credit report, and title costs tied to the loan are generally amortized with the loan costs. None of these ride along on Form 1098, which is exactly why they get forgotten; track them in your books from closing day.
Mortgage Insurance on Rentals: The Line 9 Deduction Many Owners Miss
Mortgage insurance causes confusion because the homeowner version of this deduction expired. The itemized deduction for mortgage insurance premiums as qualified residence interest ended after the 2021 tax year, and many landlords concluded PMI was dead everywhere. It is not dead on Schedule E.
Rental property is held for the production of income, so its mortgage insurance functions as an ordinary rental expense — insurance on an income-producing asset — rather than personal qualified residence interest. The IRS rental-expense guidance confirms the position plainly: mortgage insurance premiums on rental property are generally deductible in the year paid, reported on Schedule E, line 9. No income phaseouts, no itemizing requirement, no acquisition-debt tracing. If you pay $1,800 a year in PMI on a rental, the full $1,800 reduces your rental income.
Two practical notes. First, Box 5 on Form 1098 gives you the annual total — use it, but verify it against your loan statements if the insurance was cancelled mid-year. Second, check your policy status every year: once your loan-to-value ratio drops far enough, cancelling PMI you no longer need beats deducting it. A deduction returns a fraction of each dollar; cancellation returns the whole dollar.
When There Is No 1098 — or the Wrong Name Is on It
Not every rental mortgage produces a usable Form 1098. The Schedule E instructions give you a clear playbook for each case.
Interest under $600. Lenders are only required to furnish Form 1098 when interest received hits $600. A small balance or a loan paid off early in the year may produce no form at all. You still deduct every dollar of interest you actually paid — pull the total from your year-end loan statement and keep it with your return.
Seller financing or a private lender. If your recipient was not a bank or financial institution — a seller carryback note, a loan from a family member — report the deductible interest on line 13 (Other interest) instead of line 12. Be ready to substantiate it: keep the promissory note, the payment records, and the recipient's identifying details. Interest you cannot document is interest you cannot defend.
A co-borrower received the 1098. If you and someone other than your joint-filing spouse were both liable for the mortgage and the other person got the form, deduct only your share of the interest, also on line 13. Attach a statement to your return showing the name and address of the person who received the 1098, and write "See attached" next to line 13.
You paid more than Box 1 shows. This happens with mid-year servicer transfers and buydown arrangements. If additional interest is deductible, enter the entire deductible amount on line 12 and attach a statement explaining the difference, again marking "See attached." Never just overwrite the number silently — the IRS matching program sees the lender's figure, and your attached explanation is what keeps a routine mismatch from becoming a notice.
Mixed-Use Property: Allocate Before You Deduct
Everything above assumes a 100-percent rental. If you rent out only part of a property — a duplex where you live in one unit, a single-family home with a rented basement apartment — you deduct only the portion of each 1098 amount that applies to the rented part. A common method is square footage: if the rental unit is 40 percent of the home's livable space, 40 percent of Box 1 goes to Schedule E line 12, 40 percent of Box 5 to line 9, and 40 percent of the escrow-paid taxes to line 11. The personal-use remainder follows the homeowner rules on Schedule A, subject to all the usual limits.
Be consistent and document your allocation method. Use the same percentage across every 1098 box and the property tax bill, and keep the calculation — a one-line note with the square-footage figures — in your tax file. Shifting percentages year to year without a physical change to the property is exactly the kind of inconsistency that draws questions.
Converting a former residence to a rental sits at the intersection of both worlds. From the conversion date forward, interest is a Schedule E expense rather than an itemized deduction. Unamortized points from a prior refinance of what is now a rental generally continue amortizing against rental income. And the depreciation clock starts at conversion using the lower of your adjusted basis or fair market value — a separate calculation, but one that shares the same lesson: the day the property's use changes, its tax treatment changes with it.
Five Mistakes That Cost Landlords Money
- Deducting principal as interest. Only the interest portion of your payment is deductible. Every dollar of principal builds equity — valuable, but not an expense. Box 1 already excludes it; trust the box.
- Deducting escrow deposits instead of actual payments. Money you send the lender for the escrow account is not yet an expense. Property taxes and insurance become deductible when the lender disburses them. In the first and last year of a loan, deposits and disbursements routinely differ — use the disbursement figures.
- Expensing rental points in year one. The homeowner rule does not travel with you to Schedule E. Amortize points over the loan term, and keep the schedule.
- Putting rental interest on Schedule A. Mortgage interest on a rental property is never an itemized deduction. It goes on Schedule E whether you itemize or take the standard deduction — one of the quiet advantages of rental ownership.
- Forgetting the reconciliation. Before you file, tie every 1098 to its property and its Schedule E column: Box 1 to line 12, Box 5 to line 9, escrow taxes to line 11, the year's points slice to interest. A ten-minute reconciliation per property prevents the most common landlord IRS notice there is.
Keep Every Property's Interest Trail Audit-Ready
Form 1098 arrives once a year, but the discipline that makes it painless is monthly. Record each mortgage payment in your books split three ways — interest, principal, escrow — so that January's form merely confirms twelve months of entries instead of supplying the only number you have. Maintain a running points-amortization schedule per loan, log escrow disbursements when they happen, and file every year-end loan statement with the matching return. When a servicer transfer splits your interest across two statements, or a refinance ends one amortization schedule and starts another, your ledger should already tell the story.
As your rental portfolio grows, this per-property paper trail is what separates a calm tax season from a frantic one. Beancount.io offers plain-text accounting that keeps every property's interest, escrow, and amortization entries transparent, version-controlled, and AI-ready. Get started for free and see why developers and finance professionals are switching to plain-text accounting.
