If investing had a “secret extra life” like in old-school video games, it would be called
the rebalancing bonus. You set up a simple mix of stocks and bonds, walk away for a few years,
and suddenly your portfolio looks nothing like what you started with. Then you rebalanceselling a bit of what
did well, buying what laggedand, over time, you may quietly earn a little extra return while keeping
risk under control. That small, boring act is what many investors underestimate.

Ben Carlson, author of A Wealth of Common Sense and a portfolio manager at Ritholtz Wealth Management,
has written extensively about this idea. In one of his examples, a classic 60/40 stock–bond portfolio that was
rebalanced annually earned a noticeably higher return than a simple “average” of stock and bond returns over
the same period. That gap is what people call the rebalancing bonusextra performance that
comes from regularly nudging your portfolio back to its target mix rather than letting it drift.

But here’s the catch: the rebalancing bonus is real, yet not magical. It doesn’t show up every year. It doesn’t
work in every market environment. And if you do it without a plan, you can accidentally create extra taxes and
trading costs that eat up the benefits. This article walks through what the rebalancing bonus is, when it
actually helps, and how to use it in a practical, common-sense wayno PhD or fancy hedge fund required.

What Is the Rebalancing Bonus, Really?

Portfolio rebalancing is the process of bringing your investments back to your chosen
asset allocationfor example, 60% stocks and 40% bonds. Over time, as markets move, your
allocation drifts. If stocks soar, your portfolio might end up at 75% stocks and 25% bonds. If bonds rally during
a stock slump, you might slide down to 50% stocks and 50% bonds. Rebalancing simply means selling some of what
has grown too large and buying what has shrunk too small.

In theory, the rebalancing bonus comes from three things working together:

• Buying low: you add to assets that have underperformed and are cheaper relative to their past.
• Selling high: you trim assets that have outperformed and are potentially more expensive.
• Managing risk: you keep your portfolio’s risk profile closer to what you originally signed up for.

When two assets (for example, U.S. stocks and high-quality bonds) have similar long-term returns but get there
through different short-term paths, regularly rebalancing between them can produce higher risk-adjusted returns
than simply buying and forgetting. Research from large asset managers and independent analysts often shows that
periodic rebalancing can slightly improve long-term performance while reducing volatility, especially when assets
are volatile and move out of sync.

How Rebalancing Works in Practice

A Simple 60/40 Example

Imagine you invest $100,000 in a 60/40 portfolio: $60,000 in a broad stock fund and $40,000 in a bond fund.
After one strong year for stocks:

• Stocks are up 20% → $60,000 becomes $72,000.
• Bonds are flat → $40,000 stays $40,000.

Your portfolio is now $112,000, with roughly 64% in stocks and 36% in bonds. If your risk comfort zone is 60/40,
you’re now taking more equity risk than planned. To rebalance, you might:

• Sell $4,800 of stocks (bringing stocks back near $67,200).
• Use that $4,800 to buy bonds (bringing bonds near $44,800).

You’ve just locked in some gains from stocks and bought more bonds while they’re relatively cheap.
If the following year bonds outperform stocks, your rebalance will look smart. If stocks keep soaring,
you’ll underperform a pure “all stocks, all the time” investorbut that’s the price of controlled risk.

When Rebalancing Adds Value

The rebalancing bonus tends to show up when:

• Assets are volatile and move in different directions over shorter periods.
• Long-term returns are in the same ballpark (for example, U.S. vs. international stocks, or stocks vs. real estate), so buying after a slump is often rewarded.
• Markets mean-revert at least partiallyperiods of outperformance are followed by periods of underperformance and vice versa.

Studies that simulate portfolios with regular rebalancing (monthly, quarterly, or annually) often find that
rebalanced portfolios have slightly higher Sharpe ratiosthat is, more return per unit of riskcompared with
portfolios that are left to drift. Over long horizons, the difference may look small each year but can accumulate
meaningfully.

When the Bonus Disappears (or Even Turns Negative)

The rebalancing bonus is not guaranteed. It can shrinkor even go negativewhen:

• One asset class dominates for years. If stocks relentlessly outperform bonds for a long period,
  trimming stocks every year means you’ll underperform a buy-and-hold stock-heavy portfolio.
• The correlation structure changes. If historically diversifying assets start moving in
  lockstep, there’s less opportunity to buy low and sell high.
• Costs and taxes are high. Frequent rebalancing in a taxable account can generate capital
  gains and trading costs that eat up any benefit.

Morningstar and other research shops have shown that rebalancing tends to add the most value when two assets have
similar long-term returns but meaningfully different short-term patterns. When returns are very different, the
main benefit of rebalancing is risk control, not performance enhancement.

The Real Superpower: Risk Management, Not Magic Returns

Asset managers like Vanguard and Fidelity are very clear on one point: the primary purpose of rebalancing is
risk management, not performance chasing. By regularly returning to your target allocation, you:

• Prevent your portfolio from becoming too aggressive after bull markets.
• Avoid becoming too conservative after downturns, which can lock in underperformance.
• Stay aligned with your actual risk tolerance and long-term financial plan.

Think of rebalancing as enforcing your own rules when emotions want to take the wheel. When stocks are surging
and everyone is euphoric, rebalancing forces you to take some chips off the table. When markets are melting down,
rebalancing nudges you to buy what everyone else is panic-selling. It’s a built-in discipline mechanism that
keeps you from slowly drifting into a portfolio you never intended to own.

Financial planners often combine rebalancing with diversification ruleslike making sure no single stock or
risky position exceeds a certain percentage of your portfolioto reduce “single point of failure” risk. This
keeps your wealth plan resilient even when one investment goes off script.

Does Rebalancing Actually Increase Returns?

The honest, grown-up answer is: sometimes.

Academic studies, along with research from major investment firms, show that rebalancing can:

• Modestly improve long-term returns in diversified portfolios where assets have similar
  expected returns but different volatility patterns.
• More consistently improve risk-adjusted returns, meaning you get a smoother ride for a
  similar or slightly better return.

For example, simulations of 60/40 portfolios that rebalance quarterly or annually often show higher Sharpe ratios
than portfolios that are left alone, even when the average return difference is small. In many periods, the
rebalanced portfolio experiences less drift, smaller drawdowns, and a more stable risk profile.

But it’s crucial not to oversell the idea. The size of the rebalancing bonus depends on:

• The specific assets you’re using (U.S. vs. international stocks, bonds, real estate, alternatives).
• The time period (e.g., post-2008 vs. the high-inflation 1970s).
• How often and how aggressively you rebalance.
• Your trading costs and tax situation.

Ben Carlson’s work and others like it show that in some stretches, rebalancing significantly improves results,
while in other stretches, it slightly drags on returns but keeps risk much more manageable. In other words:
you rebalance for control and discipline, and the bonus is exactly thata bonus.

The Tax and Cost Side of Rebalancing

Rebalancing inside tax-advantaged accountslike 401(k)s, IRAs, or HSAsis usually straightforward. You can sell
and buy funds without triggering current capital gains. The tax bill only shows up when you withdraw the money,
not when you trade inside the account.

In taxable accounts, it’s a different story. Selling appreciated positions to rebalance can create:

• Short-term capital gains, often taxed at higher rates.
• Long-term capital gains, which are usually taxed more favorably but still reduce your net return.
• Possible state taxes on top of federal taxes.

To keep the rebalancing bonus from becoming a tax penalty, many investors use a few practical strategies:

• Rebalance primarily within tax-advantaged accounts when possible.
• Use new contributions and dividends to “rebalance by addition” instead of always selling winners.
• Pair rebalancing with tax-loss harvesting in down marketsrealizing losses to offset gains
  while staying invested in similar assets.
• For large, concentrated positions, some high-net-worth investors use charitable donations of
  appreciated assets to reduce tax impact and rebalance at the same time.

Transaction costs are lower than ever, but they’re not zero. If you’re rebalancing tiny amounts every other week,
the extra trading may not be worth it. That’s why a balanced approachboth figuratively and literallymatters.

Simple Rules of Thumb for Common-Sense Rebalancing

You don’t need a giant spreadsheet or a PhD in quantitative finance to benefit from rebalancing. A few
time-tested rules can go a long way:

1. Pick a Reasonable Frequency

Many investors rebalance:

• Once a year (for example, every January or around your birthday).
• Twice a year, often midyear and year-end.
• Or on a threshold basis, such as when any major asset class drifts more than 5 percentage points from target.

Research generally finds no single “perfect” schedule. The goal is to be consistent, not hyper-optimized down
to the decimal.

2. Use Cash Flows to Your Advantage

When you’re contributing regularlythrough payroll deposits, monthly savings, or dividend reinvestmentyou
can steer new money into the underweight parts of your portfolio. This “soft rebalancing” reduces the need
to sell winners and helps avoid unnecessary tax friction.

3. Automate When Possible

Many 401(k) plans, target-date funds, and robo-advisors automatically rebalance for you on a regular schedule
or when drift exceeds a set threshold. Automation is powerful because it:

• Removes emotional decision-making.
• Ensures consistent discipline.
• Keeps you from “forgetting” to rebalance for years at a time.

If you’re prone to second-guessing every move, automation is a way to “protect yourself from yourself.”

4. Keep It Simple

A portfolio with three to five broad, low-cost funds is far easier to rebalance than a portfolio with
dozens of niche positions. Ben Carlson’s whole philosophy in A Wealth of Common Sense is that
simplicity usually beats complexity over the long run. Fewer moving parts make rebalancingand sticking
with your planmuch easier.

Common Myths About Rebalancing

Myth 1: “You Should Rebalance Constantly to Maximize the Bonus”

More rebalancing is not always better. Hyper-frequent trading can rack up costs and taxes and may even
whipsaw you during short-term moves. For most long-term investors, annual or semiannual checks plus a
reasonable drift threshold are more than enough.

Myth 2: “Rebalancing Is About Beating the Market”

Rebalancing is primarily about aligning your risk level with your goals. If you start with
a 60/40 plan and drift to 85/15, you’re no longer executing the strategy you chose. The fact that
rebalancing may improve returns is secondary.

Myth 3: “I’ll Just Eyeball It When Things Look Out of Whack”

This sounds good… right up until emotions and headlines get involved. Without clear rules, people tend
to rebalance too late (after a big crash) or not at all (during euphoric bull markets). Written guidelines
and calendar reminders work better than “I’ll know it when I see it.”

A Step-by-Step Rebalancing Checklist

Here’s a simple checklist you can use once or twice a year:

1. Review your target allocation. Are you still comfortable with your mix (for example, 60/40)?
   Has anything changed in your lifejob, family, time to retirementthat calls for a different risk level?
2. Check for drift. Compare your current percentages to your targets. Note which asset
   classes are most over- and underweight.
3. Start with tax-advantaged accounts. See if you can rebalance inside 401(k)s, IRAs, or
   HSAs first to avoid triggering taxable gains.
4. Use new contributions and cash. Direct fresh money to underweight areas before selling
   anything in taxable accounts.
5. Consider taxes and thresholds. In taxable accounts, only sell if drift is beyond your
   chosen band (for example, more than 5 percentage points off target), and weigh the tax hit versus the
   risk of being off balance.
6. Document what you did. Keep a simple log: date, target allocation, before/after allocation,
   trades made, and reasoning. This helps you stay intentional rather than reactive.

The Rebalancing Bonus in Real Life: Lessons From Experience

It’s one thing to talk about rebalancing in theory; it’s another to watch it at work through real market cycles.
Let’s walk through some real-world style experiences that mirror what many long-term investors have lived through.

Picture an investor who started in the mid-2000s with a basic 60/40 portfolio. In the early years, stocks did
well and bonds were calm. The portfolio drifted to nearly 70/30. A rules-based rebalancing plan nudged it back
to 60/40 by selling some stocks and adding to bondsmoves that, at the time, felt slightly “boring” and even
a little pessimistic during rising markets.

Then came 2008–2009. Stocks crashed, bonds held up, and suddenly the portfolio flipped the other waymore like
45% stocks and 55% bonds at the bottom. The same rules now forced the investor to do something emotionally
brutal: sell the “safe” bonds that had held up and buy more of the very stocks that had just caused so much pain.
On paper, that is textbook “buy low, sell high.” In real life, it felt like stepping into a storm.

Fast-forward a decade. Those rebalancing tradesboring trims in good times, uncomfortable buys in bad timesmeant
the investor captured more of the recovery than someone who panicked out of stocks, while still never letting the
portfolio drift wildly off-plan. When you look back with the benefit of hindsight, the rebalancing bonus shows up
not only in dollars, but in the fact that the investor stayed invested.

A similar story showed up in the COVID crash of 2020. Markets fell at record speed, then rebounded shockingly
fast. Investors with automatic rebalancing inside target-date funds or robo-advisor accounts had their portfolios
quietly adjusted near the lows and into the early recoverywithout having to outguess the timing or read every
scary headline. That is the essence of common-sense investing: setting a rational rule in calm times and letting
it guide you during chaos.

Another real-life lesson comes from people who didn’t rebalance at all. Some long-term investors who rode the
entire bull market in U.S. stocks without trimming ended up with portfolios that were 80–90% equities by the
late 2010seven if they originally planned to be around 60/40. When volatility returned, they suddenly discovered
they were far more aggressive than they ever intended. The problem wasn’t just short-term losses; it was the
sleepless nights and the temptation to sell at the worst possible moment. A simple periodic rebalance could have
prevented that creeping risk.

Over many cycles, the main takeaway is this: the rebalancing bonus is not a lottery ticket. It’s a reward for
being methodical when everyone else is reactive. Sometimes the math gives you a little extra return. Sometimes
it simply keeps your downside manageable. Either way, it’s a quiet edge that favors investors with patience, a
plan, andyesa bit of common sense.

In the end, “The Rebalancing Bonus – A Wealth of Common Sense” is less about clever tricks and more about having
the courage to stick with a simple, reasonable strategy. Define your allocation. Set clear rules. Rebalance on
a schedule. Accept that you’ll never perfectly time the marketand that you don’t need to. Over decades,
consistency beats brilliance, and a well-tuned portfolio quietly does the heavy lifting in the background.

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