There’s a particular kind of investor I see fairly often. They’re smart. They’ve been saving for years. They have a real portfolio: a 401(k), maybe a Roth, maybe a taxable brokerage account they funded during a good year. They set it up thoughtfully, probably with some version of an allocation they read about or a planner helped them build.

And then they let it sit.

Not because they forgot about it. Not because they’re irresponsible. They let it sit because touching it felt risky, and leaving it alone felt safe, and the market kept going up, so leaving it alone kept feeling like the right call.

The thing about a portfolio you never rebalance is that it stops being the portfolio you built. It becomes whatever the market turned it into. And the market, left to its own devices, will happily drift you into a risk profile you never actually agreed to. This is what portfolio rebalancing is really about. Not optimization. Not outsmarting the market. Just maintaining the plan you set, so that the plan you set is still the one you’re actually running.

Here’s the part nobody tells you about rebalancing: it requires you to sell things that are doing well.

That’s it. That’s the whole psychological problem. When you rebalance, you’re trimming the positions that have grown beyond their target weight and redirecting that capital into the positions that have lagged. You’re selling winners. You’re buying more of what hasn’t performed as well.

Every instinct you have says that’s wrong. Our brains are wired to extrapolate. Whatever went up last year feels like it will keep going up. Whatever went down feels broken. It’s one of the most persistent money myths in investing. The rational case for rebalancing is easy to explain: you’re selling high and buying low, you’re maintaining your intended risk level, you’re preventing any single position from quietly running your entire portfolio.

The emotional case against it is louder. “But tech has done so well. Why would I trim it now?” “Small caps have been lagging for two years. Why would I add more?” “The market might drop. Maybe I should wait.” “I’ll rebalance after things stabilize.”

Things never stabilize. That’s not how markets work. And “after things stabilize” is a phrase that has cost a lot of investors a lot of money over the years.

The hidden tension underneath rebalancing isn’t intellectual. Everyone understands what rebalancing is. The tension is emotional: it asks you to act in direct opposition to what your gut is telling you to do. That’s why most people don’t do it consistently. And that’s why the ones who do tend to end up in better shape.

I’ve had a version of this conversation with clients more times than I can count.

Someone comes in for a planning review. We pull up their portfolio. And what was set up three or four years ago as a 70/30 equity-to-bond allocation has quietly drifted to something closer to 85/15, because equities ran and bonds lagged and nobody made any changes.

They didn’t do anything wrong. They just didn’t do anything. The problem is that 85/15 carries meaningfully more volatility than 70/30. If the market drops 30 percent, a 70/30 portfolio loses roughly 21 percent. An 85/15 portfolio loses closer to 26 percent. That difference doesn’t sound dramatic until it’s your actual dollars and it’s 2022 again and you’re watching your balance fall every time you log in.

The client who drifted to 85/15 without meaning to isn’t taking calculated risk. They’re taking accidental risk. And accidental risk is the kind that tends to cause the worst behavioral mistakes, because they didn’t sign up for it and they’re not emotionally prepared for it. I’ve also seen the opposite, particularly with clients who lived through 2008 or 2020 and came out the other side more scarred than they let on.

Their portfolios have drifted conservative. Equities underperformed their targets for years while they kept adding to bond funds and money market positions. They felt safe. But at sixty-one, with twenty or thirty years of retirement ahead, a portfolio that’s 40 percent equities and drifting lower isn’t a conservative choice. It’s a longevity risk dressed up as caution. Modern retirement planning requires a growth component well into your sixties and beyond.

And then there’s the concentrated position problem, which I see often with clients in their peak earning years. Company stock. RSUs that vested and never got diversified. A single position that’s now representing 30, 40, even 50 percent of a portfolio because it grew so fast. The client knows, on some level, that this is a risk. They just can’t bring themselves to sell it. It’s been so good for so long. Selling feels like giving up on something that’s been rewarding them.

The details are always different. The reluctance underneath is the same.

Portfolio rebalancing is one of those planning topics that feels low-stakes until it suddenly isn’t. Most of the time, a portfolio that hasn’t been rebalanced in a year or two still looks fine. The balance is up. The accounts are growing. There’s no obvious signal that anything is wrong.

The signal comes during a correction. When markets drop, a portfolio that drifted aggressive drops harder. When volatility spikes, the investor who didn’t realize they were holding 85 percent equities starts making emotional decisions. They sell at the bottom to stop the bleeding. They move to cash and miss the recovery. They swear they’ll get back in when things settle down, and then the market is up 20 percent before they’ve moved.

The sequence matters enormously.

For investors in their accumulation years, drifting aggressive might mean more volatility but also more growth over time. The long runway absorbs the swings. For investors in their fifties and sixties, approaching or in early retirement, a bad sequence of returns at the wrong moment can permanently impair a financial plan. This isn’t a hypothetical. It’s a documented phenomenon called sequence-of-returns risk, and it’s the reason rebalancing matters more as you get closer to the years when you’ll actually be drawing from the portfolio.

There’s also the tax layer, which adds real friction. Rebalancing in a taxable account means selling. Selling can trigger capital gains. Nobody wants a tax bill, so the rebalancing conversation gets deferred. Again. And again. Until the drift is severe enough that the tax cost of fixing it is actually significant, which creates even more reason to avoid it. It’s a pattern that rewards procrastination in the short term and punishes it in the long run.

The goal of portfolio rebalancing isn’t to time the market. It’s to maintain a consistent level of risk that you’ve actually agreed to, so that your portfolio keeps doing the job you hired it to do.

Here’s what that looks like in practice.

Know your target allocation. Before you can rebalance, you have to know what you’re rebalancing toward. This sounds obvious, but I’d estimate that a significant percentage of people with investment accounts don’t have a written target allocation they could actually recite. They have a vague sense. A rough mental model. Maybe something they remember from a conversation years ago.

A real target allocation is a specific percentage breakdown: what portion goes to domestic equities, international equities, fixed income, alternatives, cash. It reflects your time horizon, your risk tolerance, your income needs, and your goals. It gets written down. And it becomes the benchmark against which your actual portfolio gets measured.

Decide on your rebalancing trigger. There are two common approaches, and both work. The first is calendar-based: you rebalance on a set schedule, once or twice a year, regardless of what the market has done. The second is threshold-based: you rebalance when any asset class has drifted more than a set percentage (say, five percent) from its target. Schwab outlines both methods clearly if you want to compare them side by side.

Most planners use some combination of both. The important thing isn’t which method you choose. It’s that you have a method, so that rebalancing becomes a process rather than a decision you have to make fresh every time.

Use new contributions and dividends first. One of the most tax-efficient ways to rebalance is to direct new contributions and reinvested dividends toward the asset classes that are underweight, rather than selling overweight positions. Growing your savings rate makes this strategy even more effective, because more new money means more to redirect. In accounts with steady contributions, this approach can often keep the portfolio reasonably close to target without triggering a single taxable event.

Think across all your accounts together. Your 401(k), your Roth IRA, and your taxable brokerage account are separate buckets, but they’re one portfolio. The allocation decision needs to happen at the household level, not the account level. You might choose to hold bonds primarily in your 401(k) (where the interest income is tax-deferred) and equities in your Roth (where the growth is tax-free). If fixed income options like annuities are part of your picture, those decisions interact with asset location too.

That’s called asset location, and it’s one of the ways thoughtful rebalancing adds value beyond just maintaining percentages.

Be deliberate about concentrated positions. If you have a single stock or a small cluster of positions representing a disproportionate share of your portfolio, that’s a rebalancing conversation waiting to happen. The question isn’t just what percentage it represents today. It’s what happens to your financial plan if that position drops 50 percent. For clients with significant RSU vesting, company stock in a 401(k), or an inherited position they’ve never diversified, this is often the highest-leverage conversation in the whole planning relationship.

Take the tax cost seriously, but not paralyzing seriously. Yes, selling in a taxable account may trigger capital gains. That cost is real. But so is the cost of holding a portfolio that has drifted significantly from its intended risk level. The question isn’t whether you want to pay taxes. The question is whether avoiding the tax is worth the risk you’re carrying in the meantime. Often the math favors accepting the tax hit and rebalancing.

What a healthier response doesn’t look like is waiting until you feel ready. You will not feel ready. The market will not give you a clear signal that now is the time. Rebalancing is supposed to feel slightly uncomfortable. That’s how you know you’re doing it right.

If your portfolio hasn’t been rebalanced in a while, you’re not behind. You’re just ready to start. The first step is finding out where you actually are. Pull up all of your investment accounts, including the 401(k) you never look at and the old IRA from the job before this one, and add up what you actually hold. Then compare it to your target. If you don’t have a written target, that’s the first thing to establish, because without one you’re not rebalancing. You’re just moving things around.

Once you know how far you’ve drifted, you can make a plan. In tax-advantaged accounts like a 401(k) or IRA, rebalancing is straightforward: there’s no taxable event, so you can sell and buy freely to get back to target. Do it. There’s no good reason to carry unnecessary drift in a tax-deferred account. In taxable accounts, be more deliberate. Look at what you’re holding, what the cost basis is, and what a rebalancing trade would actually cost in taxes. In many cases, a partial rebalance funded by new contributions and dividend reinvestment is the right move, especially if you’re still in your accumulation years. In other cases, particularly if the drift is severe and the timeline is short, accepting the tax hit and rebalancing fully makes more sense.

If you have a concentrated position you’ve been avoiding, this is the time to at least model the scenario. What does your plan look like if that position stays flat for five years? What does it look like if it drops in half? What does diversifying it actually cost, in taxes and in giving up potential upside? These are answerable questions. They don’t have to stay theoretical.

And if this whole process feels like too much to manage alongside the rest of your financial life, that’s a legitimate reason to work with someone. Rebalancing is one of those planning tasks that sounds simple but carries real complexity once you factor in taxes, multiple account types, concentrated positions, and the psychology of doing the thing that feels wrong. A good planner doesn’t just tell you to rebalance. They build the rebalancing strategy into a comprehensive financial plan from the beginning, so it happens systematically rather than being something you have to summon willpower to do every year.

I work with clients at every stage of the accumulation journey.

Some are in their early forties, still building, with a long runway ahead. Some are in their late fifties, starting to shift from growth to income, with a lot more at stake in how their portfolio is positioned right now.

In almost every case, the portfolios that need the most attention are the ones that were set up well and then left alone. Not because the original thinking was wrong. Because the market moved, time passed, and nobody made any adjustments.

You don’t need to obsess over your portfolio. But you do need to check in with it.

If you’re not sure where your allocation stands today, or if you have a concentrated position you’ve been meaning to address, or if you just want a second set of eyes on whether your investment strategy still fits where you are in life, I’d love to have that conversation.

We’ll look at what you have, where you’ve drifted, and what a rebalancing plan actually looks like for your specific situation: your accounts, your tax picture, your goals, and your timeline. No pressure. No generic advice. Just a clear look at whether your portfolio is still doing the job you hired it to do.

Your portfolio is working hard. Make sure it’s still working the way you intended.

Portfolio rebalancing is the process of returning your investment portfolio to its original target allocation after market movements have caused it to drift. If you set up a portfolio with 70 percent in equities and 30 percent in bonds, and equities have a strong year, you might end up with 80 percent equities and 20 percent bonds, carrying more risk than you intended.

Rebalancing sells some of the overweight positions and uses the proceeds to bring underweight positions back to target, restoring the risk level you agreed to.

Most financial planners recommend rebalancing once or twice a year, or whenever any asset class drifts more than five percent from its target, whichever comes first.

There’s no single right answer. The goal is consistency, not perfection.

Rebalancing too frequently can generate unnecessary transaction costs and taxes. Rebalancing too infrequently can leave you carrying risk you didn’t intend for longer than you realize.

In tax-advantaged accounts like a 401(k), Roth IRA, or traditional IRA, rebalancing has no immediate tax consequences. You can sell and buy freely without triggering a taxable event.

In taxable brokerage accounts, selling an appreciated position triggers capital gains. Long-term gains (on positions held more than a year) are taxed at a lower rate than short-term gains.

The tax cost is real, but it needs to be weighed against the cost of carrying a portfolio that no longer reflects your intended risk level. In many cases, the math favors accepting a modest tax bill over deferring the rebalance indefinitely.

Your portfolio drifts. In a strong equity market, that typically means you end up with more equity exposure than you intended, which means more volatility and a harder drop when the market corrects. Over time, a portfolio that started at 70/30 can quietly become 85/15 or 90/10 without a single active decision.

The risk isn’t just abstract. It’s behavioral: investors who are surprised by the level of loss they experience during a downturn are far more likely to make emotional decisions at exactly the wrong time.

Yes, and honestly a downturn is one of the better times to rebalance.

When equities drop, they become underweight relative to bonds. Rebalancing means buying equities at lower prices, which is the mechanical equivalent of buying low. This is psychologically difficult, because buying into a falling market feels wrong. But it’s exactly what your target allocation calls for, and it’s one of the reasons disciplined rebalancing tends to add value over time.

Market timing is making investment decisions based on predictions about where the market is headed. Rebalancing is making investment decisions based on your current allocation relative to your target. The distinction matters. Rebalancing doesn’t require you to have a view on whether the market is going up or down. It only requires you to know what percentage you’re supposed to hold in each asset class and whether you’re currently over or under that target. Rebalancing is a rules-based process. Market timing is a guessing game.

A common guideline is to review rebalancing when any asset class is five percent or more above or below its target weight. Some planners use a tighter band, some use a wider one, depending on the client’s situation and tax sensitivity.

The more important thing is to actually check. Pulling up your accounts and comparing your current allocation to your target once or twice a year takes less time than most people think. The problem usually isn’t that it’s hard. It’s that it keeps not being urgent enough to prioritize.

Yes, and in many ways your 401(k) is the easiest place to rebalance, because there’s no tax consequence to selling and buying within the account.

Many 401(k) plans also offer an automatic rebalancing feature that will reset your allocation to your target on a set schedule. If yours offers it, it’s worth turning on.

That said, your 401(k) is one piece of a larger picture. The rebalancing decisions that matter most are the ones made across all of your accounts together, not just within each account in isolation.

Concentrated positions are one of the most common and most emotionally charged rebalancing challenges I work through with clients. The stock that represents 40 percent of your portfolio got there by performing well. Selling it feels like punishing success. But a 40 percent concentration in a single name carries a level of idiosyncratic risk that most financial plans aren’t built to absorb.

The conversation usually starts with modeling: what does your financial plan look like if this position drops 50 percent? What does it look like if you diversify it over three to five years and accept the capital gains on a schedule? Those are answerable questions, and the answers usually make the path forward a lot clearer.

Not necessarily. If you have a simple portfolio in tax-advantaged accounts and a clear target allocation, you can rebalance on your own with a straightforward annual review. Where a planner adds the most value is in the complexity: multiple account types with different tax treatments, concentrated positions with embedded gains, the interaction between rebalancing and your overall tax strategy, and the behavioral side of staying disciplined when your gut is telling you to do something different. Rebalancing isn’t rocket science. But doing it consistently, in a tax-efficient way, across a real portfolio with real complexity, is where having a second.