What we’re seeing this tax season
This tax season, we’ve worked through many cases involving transactions like the Scale AI restructuring and Meta-related investments. In particular, one pattern keeps coming up. Clients receive a Form 1099-DIV with a large number in Box 3, and that amount is often much higher than what they originally paid for their shares.
Naturally, the first reaction is confusion. Many clients ask: “I didn’t sell anything… so why is there tax?”
Understanding what Box 3 actually means
First, it’s important to clarify that Box 3 is not dividend income. Instead, it represents a nondividend distribution.
In practice, the IRS applies a simple rule. You recover your original cost first. Then, any remaining amount becomes capital gain. Therefore, the tax outcome depends heavily on your basis.
Walking through a simple example
Let’s look at a straightforward example.
You exercised ISOs earlier:
- Shares: 10,000
- Exercise price: $2.00
- Total cost (basis): $20,000
Later, as part of a transaction like Scale AI / Meta:
- You receive: $150,000 cash
- You still hold all your shares
Now, the math becomes clear.
First, you recover your $20,000 basis. After that, the remaining $130,000 becomes capital gain:
$150,000 − $20,000 = $130,000
Even though you didn’t sell any shares, the IRS treats the excess like a sale.
Adding the AMT layer
Next, we need to consider AMT, especially if your shares came from ISOs.
At the time of exercise:
- Fair market value: $6.00
- Exercise price: $2.00
- Spread: $4.00 per share
As a result, the AMT adjustment equals:
10,000 × $4.00 = $40,000
You report this amount as additional income under AMT, even though you didn’t sell anything.
Why AMT shows a different gain
Because of the ISO adjustment, AMT uses a different basis.
- Regular basis: $20,000
- AMT basis: $60,000
Now, when we recompute the gain:
$150,000 − $60,000 = $90,000 AMT gain
So, you end up with two different results.
- Regular gain: $130,000
- AMT gain: $90,000
The difference is $40,000.
How this appears on your tax return
This difference flows through Form 6251.
- Line 2i shows +$40,000 from the ISO spread
- Line 2k shows −$40,000 from the lower AMT gain
Together, they offset. This outcome is expected and reflects the correct mechanics.
Why this surprises so many people
On one hand, you didn’t sell shares. On the other hand, you received a large amount of cash. Because your original basis was low, most of that cash becomes taxable gain very quickly.
As a result, many clients feel caught off guard by the size of the tax impact.
Common patterns we’ve observed
Across many cases this season, we’ve consistently seen:
- Large Box 3 distributions
- Low exercise cost from early equity
- Significant capital gains without an actual sale
- AMT adjustments layered on top
Final takeaway
In summary, these transactions are not simple income events. Instead, they follow a sequence:
- First, basis is recovered
- Then, capital gain is triggered
- Finally, AMT adjustments are applied if ISOs are involved
If you received a large Box 3 amount, it’s important to review how your basis and AMT were handled. Small differences in calculation can lead to significant changes in tax.
If you’re seeing something similar on your return, you can check with your tax advisor, or feel free to reach out to us. We’ve worked through many of these cases this season and are happy to help review your situation.
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