Selling a Rental I Used to Live In: Two Forms, One Sale.

A couple moves out of their first house in September 2024, rents it to a tenant instead of selling, and lists it two years later with a December closing. Their question is the one everybody in that spot asks: is this a home sale or a rental sale? It's both, and the return has to say so in two different places. Selling a rental I used to live in is the one transaction where the same house gets the homeowner's break and the landlord's bill on a single Form 1040.

Run the arithmetic in the order the statute does and the sale splits into two clean pieces. The taxable piece is the depreciation, dollar for dollar. The excluded piece is everything else, which works out to the net sale proceeds minus what you originally paid plus improvements. That is a useful check on your own numbers: if the two pieces don't add back to the total gain, something in the basis is wrong.

The ownership and use test is what makes it work. You need two years of ownership and two years of use as your principal residence inside the five-year period ending on the date of sale, and those two years don't have to be the same two years or run consecutively. Move out in September 2024, close in December 2026, and you're looking back to December 2021 with roughly 33 months of residence inside the window. The clock is the thing to watch. Three years after the month you move out, the exclusion is gone, and the gap between closing inside the window and outside it is most of the tax. Rent out my house or sell it walks that deadline.

The depreciation comes off whether you want it to or not. Your basis dropped by it under §1016(a)(2), so the gain is larger by exactly that amount, and §121(d)(6) says the exclusion cannot reach it.

Most pages on this question warn that any rental use after 2008 prorates the exclusion. That rule is real. It is §121(b)(5), added by the Housing Assistance Tax Act of 2008, and Congress wrote it to stop people from buying a rental, living in it for two years, and walking off with the whole $500,000. It just doesn't point in this direction.

Read the exception. §121(b)(5)(C)(ii)(I) says a period of nonqualified use does not include any portion of the five-year period that falls after the last date the property was used as the principal residence. Rent first and move in later, and the rental months count against you. Live there first and rent it after, and they don't, as long as the sale still clears the two-of-five test. The order of operations decides it. Converting a rental to a primary residence is the same statute pointed the other way, and the answer there is much worse.

This is where the returns I see in second-opinion reviews go sideways, because the forms don't look like what happened. The sale starts on Form 4797, not Schedule D, and the exclusion shows up as a subtraction several lines later.

1. 01Form 4797, Part III, lines 19 through 24: report the full $322,636 gain. The instructions are explicit that you do not take the §121 exclusion into account when figuring the gain on line 24.
2. 02Line 26: ordinary §1250 recapture is $0. Residential rental placed in service after 1986 is depreciated straight-line, so there is no additional depreciation under §1250(b)(1) to pull back at ordinary rates. The entire $28,636 is unrecaptured §1250 gain instead.
3. 03Form 4797, Part I, line 2: write "Section 121 exclusion" on the description line and enter $294,000 as a loss in column (g). That is the instruction word for word.
4. 04What survives, $28,636, carries through Part I to Schedule D and onto the Unrecaptured Section 1250 Gain Worksheet, where §1(h)(1)(E) caps the rate at 25% or your ordinary rate, whichever is lower.
5. 05Nothing goes on Form 8949 with code H. That code is for a house that was still a home at the time of sale. This one was a rental.

The title company files a Form 1099-S reporting the gross proceeds, so the IRS has the $775,000 whether or not the return says anything. A return showing no disposition against a 1099-S is how a CP2000 starts.

The expensive mistake here is not the one people worry about. It isn't over-claiming the exclusion. It is entering the sale in the rental section of the software, answering every question about accumulated depreciation correctly, and never being asked whether anyone lived there. The software has no reason to ask. As far as it knows, the property's life started in 2024.

In second-opinion reviews I see the mechanical version of this constantly: depreciation sitting on the wrong line, two rentals crammed onto one form, methods that change from year to year. Most of that is not worth amending. This is. A missed §121 exclusion on a sale this size is the difference between a $9,235 bill and a $77,590 one, and an amended return generally has three years from the filing date to fix it.

Two things ride along with the sale and are worth checking before you sign anything. Every suspended passive loss from the rental years releases in full under §469(g)(1) when you dispose of the entire interest in a fully taxable sale to an unrelated buyer, which is often worth thousands against ordinary income in the year of sale. And if you never claimed depreciation while the house was rented, you still owe tax on it: §1250(b)(3) defines depreciation adjustments as the amounts allowed or allowable, so skipping the deduction costs you the deduction and not the tax. Catching up missed depreciation covers the Form 3115 fix, which has to happen before the closing to do any good.