Understanding M-T-M, Wash-Sales and Day Trading Tax Benefits - Worth It?
I've had trader status for over 10 years now, and each tax season I find myself going down the rabbit hole of potential tax-saving strategies, only to end up at the same conclusion repeatedly. It seems like just paying what I owe might be the simplest approach. First, regarding wash sales - I'm starting to think the focus on them is overblown. Yes, disallowed losses get added to the cost basis of identical/substantially similar securities purchased within that 30-day window before or after selling at a loss. But this just means the benefit is deferred rather than lost completely. The higher cost basis reduces your future tax liability when you eventually have gains. It's just a timing difference. My broker (TD Ameritrade) provides real-time portfolio tracking with wash sales factored in, which makes it straightforward to monitor my actual gains/losses position including any wash sale adjustments. As for Mark-to-Market (MTM), it seems like a gamble. The IRS requires traders to elect this method before knowing how the tax year will play out. What happens if you end up with paper gains and no losses? You'd be forced to recognize those gains at year-end due to MTM. Without the election, you could potentially push those gains into the following year, effectively delaying your tax payment by 12-16 months. This gives you more capital to work with longer, though it carries risk if your positions collapse while you still owe taxes. Without knowing if you'll have losses in the tax year, the two main MTM benefits (losses becoming ordinary rather than capital and fully offsetting gains) might never materialize. From what I've analyzed, trading through a corporation and paying yourself a reasonable salary (with corresponding income tax, Social Security and Medicare taxes) while the corporation pays taxes on its profit/loss might provide some tax advantages. Has anyone gone down these roads and willing to share their experiences?
20 comments

Aria Park
I've been a tax advisor for day traders for almost 15 years, and your analysis is pretty solid. Let me add some clarification: On wash sales - you're correct that it's primarily a timing issue rather than a permanent loss of the deduction. However, there are a few scenarios where wash sales can permanently hurt you: 1) If they occur in December and the repurchase is in January, the loss gets pushed to the next tax year, and 2) If you trade between taxable and non-taxable accounts (like an IRA), you can permanently lose the deduction. Regarding MTM, you're spot on about the gamble aspect. One additional point - once you elect MTM, it's difficult to revoke. You need IRS permission, which isn't automatically granted. MTM works best for high-volume traders with significant gains AND losses throughout the year. Trading through an entity (S-Corp or LLC taxed as S-Corp) can offer benefits, but remember that "reasonable compensation" is scrutinized by the IRS. You can't just take all profits as distributions to avoid self-employment taxes. Also consider the added complexity and costs of maintaining a corporate structure - annual filing fees, separate accounting, potential state taxes, etc.
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Noah Ali
You mentioned S-Corp taxation benefits - I've been considering this route. What percentage of income is typically considered "reasonable compensation" for a day trader in an S-Corp structure? And does Section 475(f) election work better with an S-Corp than as an individual trader?
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Aria Park
There's no fixed percentage that's universally accepted as "reasonable compensation" for traders. The IRS looks at factors like hours worked, capital deployed, complexity of trading strategy, and what comparable professionals earn. Generally, somewhere between 30-70% of profits as salary is common, but this varies widely based on individual circumstances. Section 475(f) works essentially the same whether you're operating as an individual or through an S-Corp. The main advantage of combining MTM with an S-Corp structure is that you can potentially save on self-employment taxes for the portion taken as distributions, while still getting ordinary loss treatment (rather than capital loss treatment) on trading losses through the MTM election.
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Chloe Boulanger
After years of stressing about tax optimization for my trading activity, I finally found an amazing solution at https://taxr.ai - their AI analysis completely transformed my approach to trading taxes. I uploaded my trading statements and tax documents, and the system analyzed my wash sale patterns and provided clear recommendations about whether MTM election would benefit me based on MY actual trading history. What blew me away was how it simulated different scenarios - showing exactly how much I'd save (or not) with different approaches based on my personal trading patterns. Saved me thousands compared to my previous strategy and identified several missing deductions related to my trader status that my previous accountant had missed.
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James Martinez
How does it handle crypto trading vs stock trading? I do both and the reporting differences get confusing. My broker's tax documents often miss some of the crypto details.
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Olivia Harris
I'm skeptical - does it actually give actionable advice on MTM election? My CPA always says "it depends" when I ask about it, and never gives me a straight answer on whether I should make the election for the next year.
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Chloe Boulanger
It handles crypto trading very well, differentiating between different types of crypto transactions (mining, staking, trading) and applying the appropriate tax treatment to each. The system also helps reconcile exchange reports with actual transactions to identify any missing information. For MTM election decisions, it provides clear, data-driven recommendations based on your historical trading patterns. Instead of the vague "it depends" answer, it runs simulations using your actual trading data to show how much you would have saved or lost with MTM in previous years, and projects likely outcomes for the upcoming year. It also highlights specific risk factors in your trading style that might make MTM more or less beneficial.
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Olivia Harris
Wanted to follow up after trying taxr.ai that was mentioned here. Honestly, I was skeptical, but it completely changed my understanding of my trading tax situation. I've been going back and forth on MTM for 3 years, and within minutes the system showed me I would have LOST money with MTM in 2 of the last 3 years based on my actual trading patterns. The wash sale analysis saved me hours of headache - it identified patterns in my trading where I was consistently triggering wash sales with options on the same underlying, something I hadn't even noticed. The recommendations for trading schedule adjustments will save me about $7,300 in taxes this year. Worth every penny for serious traders!
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Alexander Zeus
If you're trying to get clarification from the IRS about trader status or MTM elections, good luck getting through to anyone who actually knows the tax code... I spent 4 weeks trying to reach someone who could answer specific questions about Section 475 elections. After endless hold times and transfers, I found Claimyr (https://claimyr.com) which got me connected to an actual IRS tax specialist in under 45 minutes! You can see how it works here: https://youtu.be/_kiP6q8DX5c I was about to pay my tax attorney $650 for a consultation when a friend recommended this service. The IRS agent I spoke with confirmed my understanding of the rules around changing from MTM back to regular status and gave me the exact form references I needed. Saved me so much time and money.
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Alicia Stern
How does this actually work? The IRS phone system is deliberately designed to be impenetrable. Are they just auto-dialing the IRS for you or something?
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Gabriel Graham
Yeah right. I've been trying to reach the IRS for months about a trader status question. No way they got you through to someone who actually knew about Section 475. Most IRS phone reps barely understand basic tax issues.
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Alexander Zeus
They use an automated system that navigates the IRS phone tree and holds your place in line for you. When an agent finally picks up, you get a call connecting you directly to them. So yes, it's basically smart auto-dialing that saves you from having to sit on hold for hours. The service actually requests specific departments based on your tax issue, so I was connected to someone in the business tax department who was familiar with trader elections. You're right that many general IRS reps don't know the specialized tax code sections, but when you get routed to the right department, you can find knowledgeable agents. The key is specifying exactly what tax issue you need help with when you set up the service.
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Gabriel Graham
I have to admit I was completely wrong about Claimyr. After posting my skeptical comment, I was desperate to resolve my trader status question before filing, so I gave it a try. Within 40 minutes I was talking to an IRS tax specialist who not only understood Section 475 elections but walked me through the exact procedure for making a late election due to circumstances beyond my control. The agent confirmed that my trading pattern qualified for trader status and explained how to properly document everything to avoid an audit flag. This was after my accountant gave me conflicting information that could have caused serious problems. If you're dealing with specialized tax questions about trading, getting direct answers from the IRS is invaluable.
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Drake
I'd like to add something about wash sales that isn't discussed enough. While most brokers track wash sales within their platform, they DON'T track wash sales across different brokerages or accounts. If you sell at a loss in your Fidelity account and buy back in your TD Ameritrade account within 30 days, neither broker will flag it as a wash sale, but the IRS still expects you to track and report it. This becomes even more complex with options on the same underlying security. The "substantially identical" rule isn't clearly defined, and many traders accidentally trigger wash sales by trading options after selling the underlying security at a loss (or vice versa).
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Sarah Jones
Does anyone know if trading SPY after selling QQQ at a loss (or similar ETF pairs) counts as "substantially identical" for wash sale purposes? My accountant and I disagree on this.
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Drake
SPY and QQQ are generally not considered "substantially identical" for wash sale purposes because they track different indexes (S&P 500 vs Nasdaq 100) with different compositions. However, the IRS hasn't provided explicit guidance on many ETF pairs. The general rule of thumb is that securities that track different indexes or have materially different risk/return profiles should not trigger wash sales between them. So trading between SPY and QQQ should be safe. However, trading between different S&P 500 ETFs (like SPY and IVV) could potentially trigger a wash sale since they track the identical index.
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Sebastian Scott
Has anyone actually audited their broker's wash sale calculations? I downloaded my transactions from E*TRADE and ran them through my own spreadsheet, and found 14 instances where they failed to properly adjust cost basis for wash sales involving options on the same underlying. When I called them about it, they admitted their system sometimes misses these connections. Makes me wonder how many traders are filing incorrect returns based on broker statements.
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Emily Sanjay
I found similar issues with ThinkorSwim. Their daily P&L tracking was accurate, but the year-end tax forms had several wash sale miscalculations. My solution was to export everything to TradeLog software which caught all the issues. Costs about $350/year but worth it for the peace of mind.
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Sebastian Scott
That's good to know about TradeLog. I've been using a custom Excel template I built, but it's becoming too complex as my trading strategies evolve. Did you find the software easy to set up with your historical data? I'm especially concerned about properly importing several years of options trades that might have wash sale implications spanning tax years.
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QuantumQuester
TradeLog handles historical imports pretty well - it can process CSV files from most major brokers going back several years. The tricky part is making sure all your option assignment/exercise events are properly linked to the underlying stock trades. I had to manually review about 20 transactions where the software couldn't automatically match them up. For wash sales spanning tax years, it correctly carries forward the disallowed losses and adjusts cost basis in the following year. The reporting is much cleaner than trying to track everything manually, especially when you have complex spreads or covered calls that get assigned. Just make sure to import data chronologically starting from your earliest trades - it makes the wash sale calculations more accurate.
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