Does receiving the K-1 automatically make you a "material participant" in the business? I'm in a similar situation with a family business and don't know if I can claim the losses.

No, receiving a K-1 does not automatically make you a material participant. Material participation is determined by how much time and effort you put into the activity. There are seven tests for material participation in IRS Publication 925, but generally you need to work 500+ hours in the activity during the year to be considered a material participant. For rental activities specifically, they're automatically considered passive regardless of your participation hours, unless you qualify as a real estate professional (which requires 750+ hours in real estate activities and more time in real estate than any other occupation).

Yes, rental losses can affect your QBI (Qualified Business Income) deduction. Under Section 199A, QBI is calculated for each business activity and can be reduced by losses. If your rental activity is considered a qualified trade or business (which depends on several factors), the net loss would result in no QBI deduction for that activity. Additionally, net losses from qualified businesses can offset QBI from other profitable qualified businesses, potentially reducing your overall QBI deduction. It gets complicated quickly, which is why tracking these losses properly is so important.

Thanks for mentioning this! I would have totally messed that up. Do you know if I need to include all the original attachments again or just the ones I'm changing?

You only need to include the forms and schedules that you're changing with your Form 1040X. So definitely the Schedule C for your business expenses, but if you're not changing other aspects of your return, you don't need to include those other forms again. Also, you'll need to file a separate 1040X for each tax year you're amending. Don't try to combine multiple years on one form - the IRS will reject it.

Good advice. Also worth noting that the IRS generally has 10 years from the date of assessment to collect taxes owed. So depending on exactly when these returns were filed/assessed, the collection statute of limitations might be approaching.

Wouldn't using an LLC mean losing the mortgage interest deduction? I thought you could only deduct mortgage interest on your primary residence if you personally own it, not if it's owned by an LLC?

You're right to question this - an LLC typically would cause you to lose the mortgage interest deduction for a personal residence. What we actually did was create a partnership agreement rather than a full LLC (I simplified in my original comment). The partnership agreement gives us similar protections in terms of clearly defining ownership and responsibilities, but allows the property to remain in our personal names for tax purposes. This way we each get to deduct our portion of the mortgage interest while having clear documentation of our arrangement. Tax rules around entity structures can get complicated, so definitely consult with a tax professional before going this route.

I don't think that's correct. The annual gift tax exclusion is $17,000 per person for 2023 (probably higher for 2025), and it's only an issue if you exceed that amount. Plus, you'd have to file a gift tax return but probably wouldn't owe any actual tax unless you've used up your lifetime exemption, which is over $12 million.

This is super helpful! I like your approach with the business name format. One follow-up question - when you split the Schedule Cs between spouses, do you also split the expenses proportionally? Or can one spouse claim certain categories of expenses while the other claims different ones?

I split both income and expenses proportionally based on our work contribution percentage. So if we're doing a 60/40 split, each Schedule C shows that percentage of both the revenue and expenses. You could technically allocate specific expense categories to each spouse if those expenses directly relate to their specific duties, but that gets messy and might invite more scrutiny. The proportional approach is simpler and generally easier to defend if questioned.

Rev. Proc. 2002-69 is specifically about community property states, which OP mentioned they're not in. It allows married couples in community property states to treat their wholly-owned LLC as either a disregarded entity or partnership. Since OP is in a non-community property state, this wouldn't apply directly to their situation.

This is a really good point. My brother ignored the state notice after resolving the federal one and ended up with state penalties that were worse than the federal ones.

That's really helpful, thanks! If I tell them I'm waiting on more documentation, do you know approximately how much extra time they typically give?

In my experience, they usually give an additional 30 days if you ask for an extension and explain why. Be very specific about what documents you're waiting for and when you expect to receive them. I included a line in my response letter that said "I am awaiting final documentation from XYZ Casino which they have confirmed will be sent by [specific date]. I respectfully request an extension until [date + 1 week] to provide this final documentation." They approved my extension request without any issues. The key is being specific rather than vague about what you're waiting for and when it will arrive.