Every year, full-time active traders look at their tax bill and ask the same question: “Why am I paying this much when I’m essentially running a business?” Then they look at their retirement accounts. They can’t fund a 401(k) or SEP because short-term capital gains don’t count as earned income, no matter how many trades they’re making.
This isn’t bad luck. It’s the default rule. Trading income gets treated as investment income unless you actively elect a different classification. And without that election, none of the planning that works for business owners (entity choice, salary optimization, retirement contributions, fringe benefits, state-level SALT planning) is available.
The fix exists. It’s been written into the Internal Revenue Code for decades. It’s been upheld by the Tax Court repeatedly. And it produces results that look unreasonable until you see the math.
This post is the long-form companion to the case study we published for James and Carol Whitmore. They came to us writing quarterly estimated tax checks of over $60,000, with zero retirement savings against $634,114 a year in tax. We’re going to walk through what they had, what we found, and the four coordinated moves that got their tax bill to $491,440 with $117,250 a year flowing into retirement. The names are pseudonyms. The numbers are exact.
Can a full-time active trader fund retirement contributions?
Most full-time traders cannot fund retirement contributions because short-term capital gains don't qualify as earned income. Only earned income (W-2 wages or self-employment net income) is eligible for IRA, 401(k), or SEP contributions. The fix is to convert trading income into earned income through Trader Tax Status combined with an S-corp election. This case study shows one trader's path through that conversion and the $117,250 in annual retirement contributions it produced.
James and Carol realized they needed a tax plan when they started writing estimated payment checks to the IRS for over $60,000 a quarter.
You see, James had found a second calling as a stock trader after retiring from engineering. He had a real gift for trading stocks in his personal portfolio.
He had such a talent for trading that he was on track to take his six-figure portfolio and realize about $1,400,000 in capital gains. These capital gains were all short-term capital gains taxed at the ordinary income rate, and it was causing a significant tax burden at both the federal and state level.
To make matters worse, they lived in Massachusetts, which is already a high tax state. On top of their significant tax bill to the IRS, they were also behind on their state payments.
When James and Carol came to us, they were looking at a $634,114 tax bill, $495,344 going to the IRS and $138,770 going to the state. They needed help, and they needed help quickly.
Their setup was simple. All trades were happening in their personal account and getting filed on their tax return on Schedule D. Carol was also retired and she was helping with some of the administration for his trading.
When we analyzed the situation for James and Carol, we realized they were missing out on significant tax-saving opportunities. They needed a tax plan that changed the nature of their income to put it to better use.
Problem 1: Trading income wasn’t earned income.
Short-term capital gains, no matter how active the trading or how large the volume, are treated as investment income under default tax rules. Investment income doesn’t qualify for retirement plan contributions, doesn’t qualify for §162 business expense treatment, and doesn’t open the door to fringe benefits like deductible health insurance. James was full-time trading but his income was being treated as if he were a passive investor. To make matters worse, short-term capital gains are taxed at the highest rate, your ordinary income tax rate.
Problem 2: No deductible business expenses.
Without Trader Tax Status (TTS) classification, trading-related expenses (software subscriptions, professional services, education, home office, equipment) fall under §212. These are non-deductible miscellaneous itemized expenses after the Tax Cuts and Jobs Act (TCJA). James was incurring real business costs but couldn’t deduct them. These were clear and easy opportunities to reduce their taxable income by deducting expenses he was actively incurring.
Problem 3: A growing tax bill with no offsetting structure.
With trading income climbing and no retirement contributions, no business deductions, and no state SALT planning, the annual tax bill had reached $634,114. When James and Carol came to us, they had no tax planning so their only strategy was to just pay their full tax bill.
The IRS has a special tax classification that allows active traders in securities to be treated as operating a business, not just passively trading. James was making significant and active trades in his personal portfolio, so this was a good avenue to explore for them.
Unfortunately, the IRS has not laid out any clear cut qualification standards or objective tests, so qualifying for TTS can be challenging.
What we do know about TTS comes from case law. Endicott v. Commissioner, T.C. Memo. 2013-199, gave us a three-prong test to qualify:
The IRS also has cases on the other side, where trader status was denied. These show where the three-prong test bites.
Long holding periods sink the application even when dollar volume is high. The Second Circuit decided this in Estate of Yaeger v. Commissioner (889 F.2d 29, 2d Cir. 1989). The taxpayer there was holding positions for several months at a time and trading on long-term investment thinking. The court called him an investor regardless of how much he was trading. Volume couldn’t rescue an investor’s holding pattern.
Concentrated activity sinks the application even when total trade counts look high. In Chen v. Commissioner (T.C. Memo. 2004-132), the taxpayer racked up about 320 trades in a year but did almost all of them across a three-month stretch. The Tax Court ruled the activity wasn’t continuous and regular enough to qualify. The same reasoning came up four years later in Holsinger v. Commissioner (T.C. Memo. 2008-191), where 372 trades in 2002 and 204 in 2003 didn’t meet the continuity test.
The pattern across these cases: volume doesn’t carry you. The IRS evaluates whether you meet all three prongs together.
Qualifying for Trader Tax Status is only the first part for significant tax planning. The next part is electing the §475(f) Mark-to-Market (MTM) election. Making a MTM election tells the IRS you are converting your capital gains to ordinary income. The real benefit is to eliminate the wash-sale rules and the $3,000 capital loss limitation that comes with capital gains. If you have a capital loss over $3,000 for the year, you can only deduct $3,000 per year against your ordinary income. By using the MTM election, you can unlock all of your losses to offset your ordinary income.
You don’t have to make the §475(f) election to benefit from Trader Tax Status but if you are expecting a lot of wash sales because you are trading the same securities repeatedly, or if you are expecting large capital losses, then making the election is a good idea.
To make the election, you have to send a statement with your prior-year tax return or extension by April 15. That means if you want to have the §475(f) election for 2026, you need to make the election by April 15, 2026, attached to your 2025 return. You are making this year’s election on the previous return. If you miss the deadline, you have to wait until the next year to make the election. The statement should include what election you are making (§475(f) Mark-to-Market), starting in what tax year, and by what entity.
There are downsides to making the §475(f) Mark-to-Market election. At the end of the year, you will mark all your positions as if they have been sold. That means, if you are sitting on unrealized gains, at the end of the year, you will realize those gains (from a tax perspective).
James came to us as just a sole proprietor, which is the normal structure for someone making trades in their own personal portfolio.
With the qualification of Trader Tax Status and the ability to treat capital gains as business income, it unlocked the ability to explore other entity structures.
The two most natural entity structures to consider are an LLC taxed as an S-corp and a C-corp. C-corps are not great structures to house an active trader. The C-corp will pay a flat 21% tax on all income throughout the year, and you risk double taxation on taking dividends out of the company. You will also not benefit from the Mark-to-Market election and the ability to take capital losses against your ordinary income. The losses will get trapped inside the C-corp as a net operating loss.
For these reasons, we discarded the C-corp and looked at the S-corp.
S-corps are pass-through entities that gain a lot of their tax savings by allowing the owner(s) to split their profit between salary and distributions. Salary gets all the normal taxes, ordinary income and FICA (Social Security and Medicare), and distributions avoid the FICA taxes.
Based on the level of work James was doing for the business, we found his reasonable compensation to be around $104,000. This was based on the median salary for a Trader/Trading Analyst, in Massachusetts, with 2 to 5 years of experience. With reasonable compensation established, we decided to increase his salary to $186,000 to max out his Solo 401(k).
Before the entity and Trader Tax Status, James did not have any earned income. With these new improvements, we were now able to classify his income as earned income which unlocks the ability to fund a Solo 401(k).
For someone over the age of 50, the maximum contribution, in 2025, is $77,500. The employee portion of the 401(k) can be maxed out at $31,000 and the employer portion can be maxed out at $46,500. The reason we increased James’s salary was to max out the employer portion of his 401(k) which is limited to 25% of his W-2 salary.
The process of electing Trader Tax Status, S-corp, and a Solo 401(k), lowered James and Carol’s tax liability to $520,418, a tax savings of $113,696 a year, and increased his retirement account by $77,500.
Since Carol was already performing work in the business, it made sense that she needed to be on payroll too. We looked at her time spent and job functions, which included administrative functions, handling trade reconciliations, and bookkeeping.
Based on her experience and time spent on each job, we calculated her reasonable salary at $35,000 a year.
Having your spouse work in your business and collect a salary unlocks the same 401(k) benefit for them. We were able to put an additional $31,000 into her employee 401(k) and $8,750 into her employer 401(k) for a total contribution of $39,750.
Instead of putting only $77,500 into their retirement accounts, they were now putting $117,250 into their retirement accounts while saving an additional $13,535 in taxes.
The last lever to look at for James and Carol was the Pass-Through Entity Tax Election (PTET). Massachusetts is a high tax state and they were well above any State and Local Tax (SALT) cap. SALT is the ability to deduct your state taxes on your itemized deductions (Schedule A). With the cap in place it limits people with large state taxes to a maximum of $10,000 (2025).
States found a way to help people out and get around the federal SALT limits, and that was done through PTET.
Every state has different PTET rules, so consult the state you live/file in for their rules. States differ on how to elect into PTET, when to pay PTET, and what the tax rate for PTET is. Not all states have PTET so it’s important to check your state before going down this path.
For Massachusetts, their PTET tax rate is 5% on pass-through income. This tax is paid through the business, the new S-corp, and is deducted on the profit and loss statement. This lowers the federal income that shows up on James and Carol’s personal tax return. For their state taxes, they will receive a tax credit up to 90% for the taxes paid by the business.
For James and Carol, this resulted in an additional tax savings of $15,443 a year.
| Metric | Before | After | Change |
| Annual federal + MA tax | $634,114 | $491,440 | -$142,674 |
| Annual retirement contributions | $0 | $117,250 | +$117,250 |
| §162 business expense deductibility | None | Full | |
| Federal tax savings from PTET | $0 | $15,443 | +$15,443 |
Through these four moves:
James and Carol saved $142,674 in tax.
This wasn’t a one-time savings, which would be impressive enough. This savings occurs every single year they maintain their professional trader status.
On top of the tax savings, they are now putting $117,250 into their retirement accounts. These contributions are being reinvested in the market and growing tax-free. They will later be taxed when the money is distributed, but at that time, James and Carol will no longer have their trading business and will be in much lower tax brackets.
One of the items we discussed with James was how he wanted to handle the investments in their 401(k) accounts. He could have used these funds to take a passive approach with various index funds, or he could continue to trade these funds in the same way he traded his personal portfolio. The latter method was more risky but was generating a lot higher return, a win-win in James’s mind.
If you have income outside of your normal W-2, this playbook is for you.
You might not have the same trading income as James and Carol, but any supplemental income deserves a good look to see how it can be optimized.
Real estate professionals, investors, small businesses/hobbies should all consider how to optimize their income, and it should be done every year. We took a very simple situation with James and Carol and simply optimized how they were classifying their income. This unlocked the ability to take different deductions and make retirement contributions.
For James and Carol, their case was unique in that it centered around James being an active trader. If you want to look at the Trader Tax Status and §475(f) election for yourself, you will need to make sure you meet the IRS’s three-prong test. You will also need to make sure you elect Mark-to-Market before the deadline.
James and Carol lived in a high tax state and were severely limited by the SALT cap. Consult your state’s laws to see how you can benefit from PTET. This is an election that you can decide on every year, so this should be done annually.
If you have a small business or can recharacterize your income to earned income, this opens up the ability to fund retirement accounts. Don’t stop there. Look to see if there are situations where you can hire your spouse so you can increase your deductions and retirement contributions.
Is the Whitmore playbook right for my situation?
The combination of Trader Tax Status, S-corp structure, salary optimization for retirement contributions, spousal employment, and state-level SALT planning fits owner-operators with substantial income who haven't run their entity and contribution strategy as a single integrated plan. If you're an active trader, a high-earning professional, or a business owner with retained capital gains and zero proactive multi-discipline planning, the same kind of four-move playbook usually produces materially similar savings.
The Whitmore playbook worked because every move built on the one before it. The Trader Tax Status election unlocked earned income. Earned income unlocked Solo 401(k) contributions. Spousal employment doubled the retirement contribution capacity. PTET captured federal savings at the state level. None of these would have produced $142,674 in annual savings on their own. Together, they did.
That’s the work we do for clients. Most tax preparers handle the return that’s in front of them. Most financial advisors handle the portfolio. Almost nobody runs the integrated math across entity choice, classification of income, retirement contributions, and state-level SALT planning at the same time. We do. That integration is where the six-figure savings come from.
If any of these apply, the same kind of playbook is likely worth running for you:
This case study fits you if:
The Whitmore story isn’t about clever tax tricks. It’s four legitimate, well-documented moves that the IRS has rules for, courts have upheld, and any owner-operator with the right profile can run.
The catch isn’t the moves. It’s whether anyone is looking at your situation across all four disciplines at once. Most owners never get that look. The ones who do tend to find what James and Carol found: six figures of recurring annual savings sitting in plain sight, plus retirement contributions they didn’t think they could make.
Trader Tax Status (TTS) is an IRS classification for full-time active traders that converts trading from an investment activity into a business activity. It requires meeting IRS criteria for substantial volume, frequency, and the intent to make trading a livelihood. TTS classification enables §162 business expense deductions, opens the door to retirement plan contributions when combined with an S-corp structure, and allows the §475(f) mark-to-market election that converts capital gains to ordinary income.
There is no formal IRS application for Trader Tax Status. Qualification is determined by your trading activity meeting IRS criteria: substantial trading volume, frequent trading (typically daily or near-daily), and the intent to make trading your primary livelihood. The IRS evaluates these on a facts-and-circumstances basis. Most TTS-qualified traders also file a §475(f) mark-to-market election to capture the additional tax benefits.
TTS unlocks several major tax benefits: business expense deductions under §162 (instead of non-deductible §212 treatment), the ability to elect §475(f) mark-to-market to eliminate wash-sale rules and the $3,000 annual capital loss limit, and when combined with an S-corp structure, the ability to pay W-2 salary and fund retirement contributions. The Whitmore case study above shows these benefits producing $142,674 in annual tax savings and $117,250 in annual retirement contributions.
TTS is worth it when the combined value of business expense deductions, retirement contribution capacity (via S-corp structure), and §475(f) benefits exceeds the added complexity and compliance cost. For most active traders with substantial annual trading income, the answer is yes. The Whitmore case study shows one trader's combined benefit at $142,674 per year in tax savings plus $117,250 in retirement contribution capacity. Lower-volume or part-time traders may not benefit enough to justify the complexity.
The §475(f) mark-to-market election is an IRS election available to traders with TTS classification. It converts the character of trading gains and losses from capital to ordinary, eliminates wash-sale rule adjustments, and removes the $3,000 annual capital loss limit. The election must be filed by March 15 of the tax year for existing entities (filed with the prior year's tax return). It's a one-way election — once made, it generally cannot be revoked without IRS consent.
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