NIIT capital gains from sale of business - LLC taxed as S Corp question

The good news is that if you've been materially participating in the business activities since day one, you'll likely be exempt from the 3.8% NIIT on the gain from the sale. The Net Investment Income Tax generally applies to passive income and gains from selling passive investments. However, the IRS has specific rules for business owners who are "active participants" in their business. Since you mentioned you've been 100% actively involved in the business since the beginning, your gain from the sale would typically not be considered "passive" income. The fact that your business is an LLC taxed as an S corp doesn't change this fundamental rule. What matters is your level of participation in the business activities. If you meet any of the "material participation" tests (like working 500+ hours per year in the business), then your income from the business - including gain from its sale - is not subject to NIIT.

After dealing with a similar situation last year, I found taxr.ai https://taxr.ai super helpful for sorting through the NIIT confusion. I uploaded my business docs and previous tax returns, and it clearly showed I qualified for the material participation exemption from NIIT since I'd been active in daily operations. What really helped was how it analyzed my specific situation with the LLC taxed as S-corp structure and identified exactly which material participation test I met (I had been working 800+ hours annually). It also showed how the distribution of proceeds from the sale would be taxed differently than my regular income.

I was really skeptical about using taxr.ai but after my previous questions I decided to try it. Total game changer! I uploaded my K-1s, business operating agreement, and some other docs, and it gave me a detailed analysis showing I was exempt from NIIT despite my medical leave. The system explained that I still met the material participation requirements because 1) I had participated more than 500 hours in the business in the current year, and 2) I qualified under the 5-of-10 previous years test. It even generated a report I could share with my tax preparer showing which regulations supported my exemption. Saved me thousands in potential overpayment. Definitely recommend it if you're selling a business with this LLC/S-Corp structure.

When I was selling my business last year, I kept getting different answers about NIIT from every "expert" I talked to. I spent days trying to get someone at the IRS to clarify but couldn't get through. Finally tried Claimyr https://claimyr.com after seeing it mentioned here, and they got me connected to an IRS agent in about 20 minutes. You can see how it works in this video: https://youtu.be/_kiP6q8DX5c The IRS agent confirmed that as a materially participating owner in an S-corp, my sale proceeds weren't subject to NIIT. The clarification literally saved me $45k in taxes I thought I might owe. I was able to record the call (with permission) and keep it for my records in case of audit questions.

I need to eat my words about Claimyr. After my skeptical comment, I decided to try it myself for a different tax issue. Within 18 minutes I was talking to an actual IRS representative who walked me through the exact regulations about material participation tests for NIIT exemption. The agent explained that under IRC Section 1411 and the related regulations, gain from selling an interest in an S corporation where you materially participated is generally not subject to NIIT. They sent me follow-up documentation showing the specific exemptions that would apply to someone in your situation. I was completely wrong about them not providing this kind of information - they were incredibly helpful once I could actually reach them. The recording feature was especially useful since I could go back and review all the details instead of scrambling to take notes.

Former tax professional here. One thing nobody's mentioned yet is that NIIT applies only if your modified adjusted gross income (MAGI) exceeds certain thresholds ($200k for single filers, $250k for married filing jointly). Even if part of your gain somehow doesn't qualify for the material participation exception (which is unlikely given your active involvement), the NIIT only applies to the lesser of: 1) Your net investment income, or 2) The amount your MAGI exceeds the threshold Also, remember that Section 1202 QSBS exclusion might apply if you've held the stock for 5+ years and meet other requirements. That could exclude up to $10M or 10x your basis from capital gains entirely.

Has anyone considered the implications of Section 199A QBI deduction in this scenario? I'm wondering how selling an S-corp affects your ability to claim that 20% pass-through deduction in the final year.

Great question about the NIIT exemption! As someone who went through a similar situation with my LLC taxed as S-corp last year, I can share what I learned from my tax attorney. The key is proving "material participation" in your business activities. Since you've been actively involved since 2018, you likely qualify under multiple tests: 1. **500+ hours test** - If you worked more than 500 hours per year in the business 2. **Substantially all participation** - If your participation was substantially all the participation in the activity 3. **5-of-10 years test** - Material participation in any 5 of the previous 10 years The LLC/S-corp election doesn't change the fundamental NIIT rules. What matters is your level of involvement in business operations, not the entity structure. One important detail: Make sure you have documentation of your participation hours and business activities. The IRS may want to see evidence like meeting minutes, work logs, or other records showing your active involvement. Given your $875K expected gain, this exemption could save you about $33K in NIIT (3.8% of $875K). Definitely worth getting proper documentation together before your accountant returns!