Yes, definitely document those first 3 months! When you file MFS after living together for part of the year, you need to show how you're splitting shared expenses like mortgage interest, property taxes, and other itemized deductions. The IRS wants to see a reasonable allocation method - whether it's 50/50, based on income percentage, or actual payment records. For the months you lived together, gather bank statements, receipts, and any records showing who paid what. Even if your record keeping wasn't perfect, recreate what you can with bank statements and credit card records. The key is having a consistent, logical method for splitting shared expenses that you can explain if questioned. Also make sure you're not both claiming the same deduction - that's a huge red flag. If you paid the mortgage in January but your ex paid it in February, document that clearly. The IRS computers will catch duplicate claims between spouses pretty quickly.

I went through this exact situation during my separation two years ago and it was incredibly stressful. The rule about both spouses having to use the same deduction method (standard vs itemized) when filing MFS is really frustrating when you can't communicate well with your ex. What helped me was creating a simple comparison chart showing both scenarios - what our combined tax liability would be if we both took standard deduction vs. if we both itemized. I presented this to my ex as "here's what's financially best for both of us" rather than making it about what I wanted. Sometimes framing it as a purely mathematical decision rather than a personal preference can help reduce conflict. Also, if your ex insists on itemizing even when it's not optimal for both of you, document that decision. During my divorce proceedings, my attorney was able to use similar instances of financial non-cooperation as examples of unreasonable behavior. It didn't change the immediate tax situation, but it did help establish a pattern that was relevant later. The most important thing is to file correctly according to whatever method you both end up using. An incorrect filing that gets flagged by the IRS will create way more problems than paying a bit more in taxes this year.

This entire discussion has been incredibly enlightening, and I want to add a perspective from someone who's been burned by this exact issue. Last year, I had a client with a hedge fund investment where we took the above-the-line deduction for management fees based on their K-1 characterization as Section 162 expenses. Fast forward to this year - the client got audited, and it turns out the fund's "trader status" claim was completely bogus. They were making maybe 2-3 trades per month and holding positions for 6+ months at a time. The IRS reclassified all the expenses as investment expenses, which meant they were subject to the 2% AGI floor (suspended, but still problematic for audit purposes). What made it worse was that the fund provided zero documentation when we requested support for their trader status claim during the audit. Their response was basically "trust us, we qualify" with no trading statistics, no legal analysis, nothing. We ended up having to concede the position and pay penalties and interest. The lesson I learned: if a fund can't immediately provide detailed documentation supporting their trader status claim - including specific trading frequency data, holding period analysis, and legal basis for their position - don't take the risk. The audit exposure far outweighs any potential benefit, especially with miscellaneous itemized deductions currently suspended anyway. I've now adopted a policy similar to what others have described here: comprehensive documentation requirements upfront, or we treat it conservatively as investment expenses. No exceptions. My malpractice carrier loves this approach too!

As someone who's been dealing with hedge fund taxation for over a decade, I want to emphasize that the original poster's instinct to be cautious is absolutely correct. The lack of clear IRS guidance on this issue isn't accidental - it's because the rules are highly fact-specific and many funds are making unsupported claims. I've seen this pattern repeatedly: funds claim trader status to justify above-the-line treatment of management fees, but when you dig into their actual trading patterns, they don't come close to meeting the "frequent, regular, and substantial" standard established in cases like Groetzinger and Chen v. Commissioner. The red flags I always look for: 1) Generic trader status explanations that could apply to any fund, 2) Inability to provide specific trading frequency statistics, 3) Average holding periods measured in weeks rather than days, 4) No documentation of a Section 475(f) election, and 5) Marketing materials that emphasize long-term investment strategies. My recommendation: Don't take these deductions unless the fund can provide a detailed legal memorandum explaining how they meet each prong of the trader status test, along with supporting trading data. With miscellaneous itemized deductions suspended through 2025, there's literally no benefit to taking the aggressive position right now, but plenty of audit risk. The stories shared in this thread about funds providing zero documentation during audits should be a wake-up call for anyone considering these positions. Protect yourself and your clients by requiring bulletproof documentation upfront.

One mistake I made last year - I only reported my net winnings from betting (winnings minus losses) instead of reporting the full 1099 amount as income and then deducting losses separately. Got a letter from the IRS a few months later! The system flags discrepancies between reported 1099 income and what you put on your return. Make sure you report the FULL 1099 amount on Schedule 1 as income, then deduct eligible losses on Schedule A if itemizing.

This is exactly the situation I found myself in last year! Here's what I learned from my tax preparer: You absolutely must report the full 1099 amounts from PrizePicks and Underdog as income - there's no way around that. The IRS gets copies of those 1099s and will expect to see that income on your return. For your losses from other sportsbooks, you can deduct them on Schedule A, but only up to the amount of your gambling winnings. So if you had $5,000 in 1099 winnings but $8,000 in total losses, you can only deduct $5,000 of those losses. The key decision is whether itemizing (to claim those losses) gives you a bigger deduction than taking the standard deduction. For 2023, the standard deduction was $13,850 for single filers. So unless your gambling losses plus other itemizable deductions (like mortgage interest, state taxes, charitable donations) exceed that amount, you're better off taking the standard deduction and just paying tax on the full 1099 income. Keep every record you can - screenshots, bank statements, anything that shows your betting activity. Even if you don't itemize this year, you might need those records later.

3 Does anyone know if the March 2 deadline applies to the 1095-B form too? My insurance is through my wife's employer but we get a B form instead of C for some reason.

Thanks for all this helpful info everyone! I'm a newcomer here but dealing with the same 1095-C issue. My employer's HR department has been giving me the runaround about when the form will be available, and I was getting really stressed about filing my taxes. Reading through this thread has been super reassuring - especially learning that the March 2nd deadline hasn't passed yet and that I can actually file without waiting for the form. I had no idea the federal penalty for not having coverage was eliminated, so I was worried about getting all the health insurance details perfect. I think I'm going to go ahead and file this weekend since I know I had employer coverage all year. Really appreciate this community sharing their experiences - saved me a lot of unnecessary worry and probably weeks of waiting for my refund!

idk if this helps but when I had this problem it was bc my birth certificate had my middle name spelled different than my ss card

Another thing to check - make sure you're using the exact same name format that appears on your W-2 forms. Sometimes employers use your old name on tax documents even after you've updated your info with them. If your W-2 shows your maiden name but you filed with your married name, that could cause the mismatch. You might need to file with your maiden name this year and update everything for next year's filing.