The $22,800 Tax Most Investors Don't Know They're Paying

You check your brokerage statement. Your portfolio returned 8.4% last year. You feel good about it — $74,000 in investment income on top of your $640,000 salary.

Here's what you didn't see: 3.8% of that $74,000 — $2,812 — disappeared before you ever touched it. Not to capital gains tax. Not to income tax. To a tax most high earners don't even know exists.

If you're a married couple earning over $250,000 a year (or a single filer over $200,000), you're paying an extra 3.8% on your investment income. And if your CPA never mentioned it, there's a reason: most of them don't plan around it. They just file it.

Let's fix that.

What the NIIT Actually Is (In Plain English)

The Net Investment Income Tax — NIIT for short — is a 3.8% surtax Congress added in 2013 to fund the Affordable Care Act. It applies to the lesser of:

• Your net investment income (interest, dividends, capital gains, rental income, royalties, passive business income)
• OR the amount your modified adjusted gross income (MAGI) exceeds $250,000 (married filing jointly) or $200,000 (single)

Here's what that looks like with real numbers.

Scenario: Married couple, combined MAGI of $620,000, with $80,000 in net investment income.

Step 1: $620,000 − $250,000 = $370,000 (income over threshold) Step 2: Net investment income = $80,000 Step 3: NIIT applies to the lesser amount = $80,000 Step 4: 3.8% × $80,000 = $3,040 a year — gone.

Over 10 years, assuming the same numbers, that's $30,400 in invisible taxes. And that's a conservative scenario. For a higher-earning couple with significant investment income — say $850,000 MAGI and $200,000 in investment income — the annual NIIT hits $7,600.

That's not a rounding error. That's a second car payment. A family vacation. A year of private school tuition.

Why Your CPA Never Brought It Up

Most CPA firms operate on an annual cycle. You send them your documents in March. They prepare your return in April. They file it. You pay the bill. And nobody talks again until next March.

The NIIT gets calculated automatically by tax software. It shows up on your Form 1040 as a line item. Your CPA sees it, files it, and moves on. They don't strategize around it because — here's the honest answer — they're not thinking about investment income throughout the year.

Year-round tax planning changes this. When you know the NIIT exists and you know your projected MAGI in June — not next April — you have options.

Three Strategies That Can Cut Your NIIT Exposure

1. Time Your Capital Gains

The NIIT only applies to the year you realize a gain. If you have flexibility on when to sell appreciated assets, you can spread gains across multiple tax years to stay under the MAGI threshold in any single year.

How it works: Instead of selling $150,000 in appreciated stock in one year, sell $75,000 in December and $75,000 in January. You cut that year's NIIT exposure in half — and you're only waiting one month.

2. Structure Rental Income as Non-Passive

Here's one most CPAs don't think about. Rental income typically counts as "passive" — meaning it falls under the NIIT. But if you or your spouse qualifies as a real estate professional under IRS rules (spend more than 750 hours and more than half your working hours in real estate activities), your rental income can be reclassified as non-passive.

Non-passive income is still taxable — but it's no longer subject to the 3.8% NIIT. For a real estate investor with $100,000 in rental income, that's a $3,800 annual savings just for documenting your hours correctly.

3. Use Charitable Strategies to Lower MAGI

Since the NIIT is calculated based on your MAGI, every dollar you reduce your adjusted gross income is a dollar that potentially escapes the 3.8% surtax. Two approaches:

• Donor-advised funds: Bunch multiple years of charitable giving into one year. The deduction lowers your AGI in the contribution year, potentially pulling you below the NIIT threshold.
• Qualified charitable distributions (QCDs): If you're 70½ or older, direct IRA distributions to charity instead of taking them as income. The distribution never hits your MAGI at all — meaning it avoids both income tax and the NIIT.

Real Scenario: The Orthopedic Surgeon Who Saved $11,400

Let's make this concrete.

The situation: An orthopedic surgeon in San Diego. Earns $680,000 in W-2 income. Has a taxable brokerage account generating $120,000 a year in dividends and capital gains. Married, files jointly. Total MAGI: $800,000.

Before: His CPA filed his return. NIIT on $120,000 of investment income: $4,560. Every year. Nobody mentioned it.

What we did: Mid-year review in June. Three moves:

1. Shifted $40,000 of dividend-paying holdings into a municipal bond fund (tax-exempt interest doesn't count as net investment income)
2. Timed the sale of $50,000 in appreciated stock to split across two tax years
3. Qualified his wife as a real estate professional on their three rental properties, reclassifying $30,000 in rental income as non-passive

After: Net investment income dropped to $65,000. NIIT fell from $4,560 to $2,470 — and that's just year one. The ongoing annual savings from the structural changes: approximately $4,800 a year.

Total first-year savings: $11,390. The consultation took 90 minutes.

What to Do Before December

You're reading this in June. That's the perfect time to act — you have six months of visibility into your year and six months left to make changes.

Here's your mid-year checklist:

1. Pull your year-to-date investment income. Dividends, capital gains distributions, interest. Add it up.
2. Project your year-end MAGI. Take your YTD income, add estimated earnings for the rest of the year. Are you over $250,000 (married) or $200,000 (single)? If yes, you're paying the NIIT.
3. Look for levers you can pull before December: Tax-loss harvesting, gain timing, Roth conversions, charitable bunching.
4. Talk to someone who plans year-round, not just in April.

The NIIT isn't going anywhere. With TCJA rates having expired and new rate discussions underway for 2026 and beyond, the 3.8% surtax is one of the few certainties in the current tax landscape. The question isn't whether you'll pay it. It's whether you'll know you're paying it — and whether you'll do something about it before December rolls around.

Most people won't. Most CPAs won't bring it up. That's exactly why the people who act on it save thousands every year.

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Want to know exactly how much the NIIT is costing you? Book a free 30-minute strategy session. No obligations. No pressure. Just a clear look at what you're leaving on the table.

Call (619) 280-2700 or email info@RoadmapTax.com

FAQ

What is the Net Investment Income Tax (NIIT)?

The NIIT is a 3.8% surtax on the lesser of your net investment income or the amount your modified adjusted gross income exceeds $250,000 for married couples filing jointly or $200,000 for single filers.

Who has to pay the NIIT?

The NIIT applies to high-income earners — married couples with MAGI over $250,000 and single filers with MAGI over $200,000 who also have investment income from sources like dividends, interest, capital gains, rental income, or passive business income.

What counts as net investment income for the NIIT?

Net investment income includes interest, dividends, capital gains, rental and royalty income, non-qualified annuity income, and income from passive businesses. W-2 wages, self-employment income, and Social Security benefits do not count.

Can I avoid the NIIT by reinvesting dividends?

No. Reinvested dividends still count as net investment income for NIIT purposes. The tax applies when the dividend is paid, regardless of whether you take the cash or reinvest it.

Does the NIIT apply to retirement account income?

Generally no. Income from traditional IRAs, 401(k)s, and other qualified retirement plans is not subject to the NIIT. However, income from taxable brokerage accounts, real estate rentals, and other non-retirement investments is included.

How is the NIIT different from regular capital gains tax?

The NIIT is an additional 3.8% surtax on top of whatever capital gains or ordinary income tax you already owe. If you're in the top capital gains bracket (20%), the NIIT brings your effective rate to 23.8% on investment income. It is not a replacement for income tax — it is an extra layer.