Should I Sell a Stock With a Large Capital Gain?

4 days ago

6 min read

If you own a stock that has appreciated substantially, you may have a problem that sounds like a good one to have:

You made a lot of money.

But now you are staring at a large unrealized capital gain and wondering:

Should I sell the stock and pay the tax, or keep holding it and avoid the tax for now?

This is a question I hear frequently from pre-retirees, retirees, and people who have accumulated significant wealth in a taxable investment account.

The answer is not simply, "Don't sell because you'll owe taxes."

And it is not, "Sell immediately and diversify."

The better answer is:

Look at the investment risk, the tax consequences, and your overall financial plan together.

Hi! I'm Charlie.

As a CPA and CFP®, I spend a lot of time helping clients make decisions like this. Focused Up Financial, LLC

The Short Answer: Sometimes You Should Sell

A large capital gain should not, by itself, prevent you from selling an investment.

Yes, selling appreciated stock can create a significant tax bill. But the tax bill is only one part of the decision.

You also need to ask:

How much of your portfolio is invested in this one stock?
Would you buy this stock today if you didn't already own it?
What are you planning to do with the money?
How much income will you have this year?
Could your tax situation change in the future?
Are you approaching retirement?
Could you spread the sale over multiple years?
Do you have capital losses that could offset some of the gain?
Are you planning charitable gifts?
Would selling help you create a more diversified retirement portfolio?

Sometimes paying the tax is the price of fixing an investment problem.

And that can be a very reasonable price to pay.

Don't Let the Tax Tail Wag the Investment Dog

Here's one of the biggest mistakes I see.

Someone owns $1 million of stock that they originally purchased for $200,000.

They have an $800,000 unrealized gain.

They don't want to sell because they don't want to pay taxes on that $800,000.

I understand the hesitation.

But there is a problem with this thinking.

The stock doesn't know what you paid for it.

If you had $1 million in cash today, would you invest the entire $1 million in that same company?

If the answer is no, you have to ask yourself why you're continuing to hold the stock simply because selling it creates a tax bill.

Your cost basis is relevant for calculating taxes.

It should not necessarily determine your investment strategy.

What If the Stock Makes Up Too Much of Your Portfolio?

Concentration risk is one of the biggest reasons you might consider selling an appreciated stock.

This can happen when someone has:

Employer stock
Stock received through an inheritance
A longtime investment that has dramatically appreciated
Shares from an early investment
A concentrated position that simply grew faster than the rest of the portfolio

Imagine you have a $3 million portfolio and $1.2 million is invested in one company.

That's 40% of your portfolio.

You might have a $900,000 capital gain in that position.

The tax bill could be painful.

But what happens if that company has a major problem and the stock falls 40%?

Your tax bill might suddenly look like a much smaller concern.

This is where I believe it's important to separate tax avoidance from tax efficiency.

The goal isn't necessarily to pay zero taxes.

The goal is to make good financial decisions while avoiding an unnecessarily large tax bill.

Could You Sell the Stock Gradually?

You don't necessarily have to choose between:

Sell everything or Sell nothing.

There is another option: sell gradually.

For example, instead of selling a $1 million concentrated position in one year, you could potentially sell portions over several tax years.

This may allow you to:

Reduce concentration risk gradually
Spread capital gains across multiple years
Coordinate gains with other income
Take advantage of lower-income years
Reinvest proceeds into a diversified portfolio

Of course, whether this works depends on your individual tax and investment situation.

But the important point is that the decision doesn't have to be all-or-nothing.

What Happens to Capital Gains Taxes When You Retire?

This is where the question gets particularly interesting for pre-retirees.

Your income may change dramatically when you retire.

While working, you may have salary, bonuses, business income, and other compensation.

After retirement, your income may come from a combination of:

Social Security
Pension income
IRA and 401(k) withdrawals
Investment income
Capital gains
Other sources

That transition can create opportunities for tax planning.

For some people, the years immediately before and after retirement can be particularly important because they may have more control over how much taxable income they recognize.

That means the question isn't simply:

"Should I sell the stock?"

It may be:

"When is the most tax-efficient time for me to sell the stock?"

That's a much better question.

Could You Harvest Capital Gains?

Capital gains harvesting is the intentional realization of investment gains when doing so may be tax-efficient.

Suppose you have a highly appreciated stock and you are entering a period when your taxable income is lower.

It may make sense to realize some gains during that period rather than continuing to defer them indefinitely.

This can be especially relevant in retirement planning because capital gains, Roth conversions, retirement account withdrawals, Social Security, and other sources of income can interact with one another.

One decision can affect another.

That's why I don't like looking at a capital gain in isolation.

What About Roth Conversions?

Here's another important consideration for retirees and pre-retirees.

You may have a window in retirement when your taxable income is relatively low.

You might be considering:

Should I realize capital gains?

But you might also be asking:

Should I convert some traditional IRA money to a Roth IRA?

Both decisions can have tax consequences.

And both can use up valuable tax bracket space.

You may ultimately decide to do some combination of the two. Or you may determine that one strategy makes more sense than the other.

The answer depends on your projected income, portfolio, retirement timeline, future tax situation, charitable goals, and other factors.

This is why I believe retirement tax planning should be done several years at a time, rather than simply looking at this year's tax return.

What If You Have a Large Capital Gain and Don't Need the Money?

You might be thinking:

"I don't need to sell the stock. Why would I create a tax bill?"

That's a reasonable question.

If the investment is appropriately sized within your portfolio, you have a high degree of confidence in the company's future, and you don't need the money, holding may be perfectly reasonable.

But "I don't need the money" isn't necessarily the same as "I should continue holding this investment."

You should still periodically ask whether the investment fits your overall financial plan.

Your circumstances may have changed.

The stock may now represent a much larger percentage of your wealth.