I’m a Financial Advisor: These 7 Capital Gains Moves Can Quietly Increase Your Tax Bill
Written by
Laura Beck
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Molly Sullivan
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Most investors focus on returns and forget about the tax hit. But that can really cost you.
Financial advisors said several common capital gains mistakes can quietly drain your portfolio without you realizing it.
Taxes Are the Silent Killer
Lance Morgan, founder of College Funding Secrets, explained why this matters. “Taxes are the silent killer of the gains you could have if your money could grow tax-free or tax deferred,” he said. “Opportunity cost is the most expensive cost when paying capital gains taxes.”
When you sell investments and pay taxes, that money stops growing and compounding. Morgan pointed out that taxable investments are actually the most expensive investments because of this drag.
1. Selling One Day Too Early
One of the most common mistakes is selling just before hitting the 12-month mark, according to Jason Thrap, a financial advisor with Benson Wealth Management. “A sale of a stock one day short of a year is taxed as ordinary income, not at the lower long-term capital gains rate,” he explained.
The gap can be huge for higher earners. A $10,000 gain at 11 months gets taxed at 35% ordinary rates for $3,500 in taxes. Wait until 13 months and it drops to 15% long-term rates for $1,500. That’s a $2,000 difference for waiting a few weeks.
2. Buying Mutual Funds at the Wrong Time
Thrap warned about mutual fund capital gain distributions late in the year. Funds distribute realized gains and if you hold the fund on the distribution date, you pay tax on those gains even if they came from prior years. “Buying right before year-end can trigger an unexpected tax bill,” he said.
Checking a fund’s distribution schedule before buying can help avoid this surprise.
3. Ignoring State Taxes
Selling appreciated investments in a high-income year can push gains into higher brackets and trigger additional taxes, according to Thomas Brock, a CPA and expert Annuity.org. States often tax capital gains as ordinary income or have their own rules.
Thrap added that state taxes are frequently overlooked but can significantly increase the true cost. “A 9% state tax adds materially to your federal tax,” he explained.
4. The Net Investment Income Tax Trap
Many investors don’t account for the 3.8% net investment income tax that hits when modified adjusted gross income exceeds $200,000 for single filers or $250,000 for married couples, Thrap said.
A $50,000 gain for a couple with income of $300,000 could trigger up to $1,900 extra tax from NIIT. People near these thresholds should model their income before making big sales.
5. Missing Loss Harvesting Opportunities
Brock said neglecting tax-loss harvesting is a costly mistake. Realized losses offset realized gains and up to $3,000 of ordinary income.
Thrap advised doing a year-end review to harvest losses. “If you miss harvesting losers you lose that offset this tax year,” he said.
6. Rebalancing Without Thinking About Taxes
Selling appreciated positions to rebalance creates immediate taxable gains. Thrap recommended rebalancing with new contributions, dividends or within tax-deferred accounts first. “If you must sell in a taxable account, do it tax-aware,” he said.
7. Home Sale Gains That Exceed Exclusions
The home sale exclusion shields $250,000 for single filers and $500,000 for married couples, but only if you meet ownership and use rules. Gains above those thresholds are taxable.
Thrap said to estimate your expected gain before selling and confirm you meet the tests. If your gain will exceed the exclusion, consider timing or consult a CPA for strategies.
The Better Approach
Morgan suggested ways to avoid capital gains entirely: invest in tax-free or tax-deferred accounts or don’t sell stocks and leave them to beneficiaries who can inherit them tax-free.
Thrap said capital gains planning works best when it’s proactive. “Evaluating tax implications before making investment decisions helps ensure a portfolio strategy supports broader financial goals,” he explained.
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