How to Fill Out Schedule E for an Owner Occupied Duplex in Redondo Beach

Published August 10, 2026

If you live in one unit of your Redondo Beach duplex and rent the other, you only report the rented unit on Schedule E, and every shared expense has to be split first. Here is how the allocation actually works under section 280A.

The short answer

You only report the rented unit's income and expenses on Schedule E. Your own unit never goes on the form. For costs that cover the whole duplex, such as the roof or the property tax bill, you split them between the two units, most commonly by square footage or by a per unit fraction, before entering the rental unit's share on Schedule E. Section 280A governs personal use of a dwelling unit that is also rented.

Last verified: August 10, 2026

Why a duplex isn't one rental property

A duplex you occupy is legally two things at once: a rental activity and a personal residence, sharing one structure. Schedule E asks for income and expenses from rental real estate. It has no line for the unit you live in. Redondo Beach owner occupied duplexes, especially the older beach cities stock near the Esplanade and inland toward Aviation and Artesia, routinely trip owners up here because the mortgage, insurance, and property tax bill arrive as one number for the whole lot, not itemized per unit.

The IRS instructions for Schedule E define a "dwelling unit" as a house, apartment, condominium, mobile home, boat, or similar property, according to the Instructions for Schedule E. A duplex with two units is generally treated as two dwelling units for this purpose when one is your residence and the other is rented to a tenant.

Two separate questions, not one

Owners conflate two distinct issues that section 280A and the Schedule E instructions actually keep apart.

Question one: how much of the whole-building expenses belongs to the rental unit. This is a cost allocation problem. If your two units are roughly the same size, a 50/50 split by unit count is defensible. If they aren't, square footage is the more common practical method landlords and preparers use to prorate shared costs like the roof, foundation, exterior paint, property tax, and hazard insurance on the structure as a whole. Neither the Schedule E instructions text nor section 280A that I was able to retrieve spells out square footage as a required formula for this category of cost. This is the piece to confirm with a CPA for your specific bill.

Question two: whether your own use of the rental unit itself limits your deductions. This is what section 280A actually governs, and it applies to your personal use of the unit you're renting out, not to the fact that you live next door in the other unit. If you never use the rented unit personally, this test doesn't restrict you. It becomes relevant only if you occasionally stay in the rented unit yourself, for example between tenants.

The personal use test, if it applies

Under 26 U.S.C. section 280A(d)(1), a dwelling unit is treated as used by the taxpayer as a residence if personal use exceeds the greater of 14 days or 10 percent of the number of days during the year the unit is rented at a fair rental value. Section 280A(e)(1) then caps deductible expenses using a time based formula: the deductible amount cannot exceed the share that the number of days the unit is rented at fair rental bears to the total number of days the unit is used.

The Instructions for Schedule E give a worked version of this same math: if you used a property for personal use for 7 days and rented it for 63 days, 10 percent of your expenses (7 divided by 70) are not rental expenses and cannot be deducted on Schedule E.

For a straightforward owner occupied duplex where you occupy one unit as your home and a tenant occupies the other full time, this personal use test typically doesn't come into play, because you aren't using the rented unit itself. What you're really doing is allocating shared building costs between two separate dwelling units, which is a basis and expense allocation exercise, not a section 280A personal use limitation.

What actually goes on the form

For the rented unit, report on Schedule E:

| Line item | What to include |

|---|---|

| Rents received | Rent collected from the tenant in the other unit only |

| Mortgage interest | The rental unit's allocated share of interest on the loan |

| Property taxes | The rental unit's allocated share of the tax bill |

| Insurance | The rental unit's allocated share of the policy premium |

| Repairs | 100 percent if the repair is exclusively in the rental unit; allocated if it's a shared system |

| Depreciation | Basis allocated to the rental unit's share of the depreciable structure, depreciated separately from your own unit |

Your own unit's share of mortgage interest and property tax is a personal itemized deduction on Schedule A, subject to the normal Schedule A rules and limits, not a Schedule E entry.

A liftable summary

If you occupy one unit of a two unit building and rent the other out full time to a tenant you don't personally use the unit yourself: allocate shared whole building costs between the two units (commonly by square footage or unit count), report only the rental unit's allocated share and its rental income on Schedule E, and keep your own unit's mortgage interest and property tax on Schedule A. Section 280A's personal use test applies to your use of the rented unit itself, not to living in the other unit.

FAQ

Do I report my own unit's rent-equivalent value as income anywhere?

No. There is no requirement to impute or report rental income for the unit you occupy as your residence. Schedule E only asks for actual rental income received from tenants.

Does section 280A limit my deductions if I never set foot in the rented unit?

Based on the personal use definition in 26 U.S.C. section 280A(d)(1), the limitation is triggered by your personal use of the unit that is rented. If you occupy only the separate unit and never use the rented unit, that specific limitation generally shouldn't apply to the rented unit's expenses.

Is square footage the required method to split shared costs like the roof or property tax?

I could not confirm a specific IRS requirement mandating square footage over other reasonable methods, such as a per unit split, for whole building costs that aren't tied to days of use. Pick a consistent, reasonable method and apply it every year. Confirm the right method for your specific expense categories with a CPA.

What if I rent out my unit for a few weeks while I'm away and stay in the tenant's unit?

That crosses into the personal use question section 280A actually addresses. Track the days carefully, since exceeding the greater of 14 days or 10 percent of rental days for personal use of the rented unit can trigger the deduction limits described in the Schedule E instructions and Publication 527.

Do I depreciate the whole duplex or just the rental unit?

You depreciate only the basis allocated to the rental unit, using its own depreciation schedule and placed in service date on the rental unit's return. Your own unit's portion of the building isn't depreciated.

This is general information, not tax advice. Confirm your allocation method, basis split, and depreciation schedule with a CPA before you file.

Topics: taxes, schedule e, section 280A, duplex, redondo beach

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