By the end of this lesson you understand why a portfolio is rebalanced and why rebalancing isn't the same as deciding a new asset allocation.
\nModule 1 introduced asset allocation: the decision of what percentage of a portfolio goes to each asset class. Over time, different assets' prices don't evolve the same way -- some rise more than others, some fall while others hold steady -- so a portfolio's actual weights gradually drift from that target allocation, even if the investor does nothing. This lesson explains why it's worth correcting that drift.
\nRebalancing is the action of bringing a portfolio's actual weights back toward its target allocation -- selling part of what has grown above its target weight, buying what has fallen below, or both. It's important to be precise about what rebalancing is and isn't: rebalancing isn't deciding a new asset allocation -- the target allocation stays the same. Rebalancing is the action of readjusting the portfolio relative to that already-decided allocation, not changing it. Changing the target allocation itself is a different decision -- for example, if the investor's risk profile or time horizon changes, already covered in Module 1 -- not something that happens from the simple passage of time.
\nWithout rebalancing, this drift has two consequences. The first is that the portfolio can drift over time toward unwanted concentration risk, already covered in Module 3: if the assets that have risen most keep accumulating more and more weight, the portfolio ends up exposed to whatever happens specifically to those few positions, more than what was originally decided. The second is that part of the benefit of diversifying, already covered in Module 2, is lost: a portfolio that has drifted a lot from its target allocation no longer spreads capital the way that was originally decided would best reduce the portfolio's overall risk.
\nA portfolio that starts with 60% in stocks and 40% in bonds can, after a period in which stocks rise much more than bonds, end up with 75% in stocks and 25% in bonds -- without the investor having made any decision. That portfolio is now riskier than originally decided. Rebalancing it means selling part of the stocks and buying bonds until returning, approximately, to the initial 60/40 -- not deciding whether 60/40 is still the right allocation.
\nRebalancing is bringing a portfolio's actual weights back toward its already-decided target allocation -- it isn't deciding a new allocation. Without rebalancing, a portfolio can drift toward unwanted concentration risk and lose part of the benefit of the diversification it was built with.
\nWhy isn't rebalancing a portfolio the same as deciding a new asset allocation?
\nWhat two consequences does never rebalancing have for a portfolio?
","sortOrder":1,"readingMinutes":7,"difficulty":"Intermedio","url":"/en/academy/portfolio-management/rebalancing/why-rebalance-a-portfolio"},{"id":78,"moduleId":28,"slug":"how-often-and-by-what-criteria-do-you-rebalance","title":"How often and by what criteria do you rebalance?","summary":"You understand what frequency and criteria guide when to rebalance a portfolio, without it being a rigid time-based rule.","bodyMarkdown":"## Objectives\n\nBy the end of this lesson you understand what frequency and criteria guide when to rebalance a portfolio, without it being a rigid time-based rule.\n\n## Content\n\nThe previous lesson explained why to rebalance. This lesson develops when to do it -- a question with no single answer valid for every portfolio.\n\nA first criterion is periodic review: checking the portfolio at some fixed interval -- once a year, for example -- to see if its actual weights have drifted from the target allocation. It's important not to confuse reviewing periodically with automatically rebalancing at every review: reviewing simply means checking whether there's drift; rebalancing only makes sense if the observed drift justifies it. An annual review can perfectly well conclude that no change is needed.\n\nA second criterion is deviation, or threshold: instead of setting a date, you define how far an actual weight can drift from its target -- a few percentage points, for example -- before acting, and you rebalance as soon as that threshold is crossed, regardless of the date. Neither criterion is the only valid one: a periodic review with no threshold at all can let an important drift go unaddressed until the next review date, while a threshold with no periodic review to check it never gets applied in practice -- that's why, in practice, both criteria are usually combined: reviewing at some regular interval and acting only if the observed drift exceeds the set threshold.\n\nThe greater the drift an investor is willing to tolerate before acting, the greater the concentration risk that can accumulate in the portfolio in the meantime, already covered in the previous module -- the criterion for when to rebalance is directly tied to how much drift from the target allocation, and therefore how much additional risk, one is willing to accept between one correction and the next.\n\n## Example\n\nAn investor who reviews their portfolio once a year and rebalances only if some weight has drifted more than a few percentage points might, in calm years, make no change -- and in years with sharp moves, correct a notable drift. Another investor who reviews more often but tolerates a wider band before acting might end up rebalancing at a similar frequency, despite reviewing more often.\n\n## Common mistakes\n\n- Thinking rebalancing more often is always better, without considering the cost of doing so, developed in the next lesson.\n- Confusing periodically reviewing the portfolio with automatically rebalancing every time it's reviewed.\n\n## Summary\n\nThere's no single frequency or single valid criterion for rebalancing. Periodic review checks whether there's drift; the threshold criterion sets how much drift is tolerated before acting; in practice, both are usually combined. The more drift tolerated, the greater the concentration risk that can accumulate in the meantime.\n\n## Self-check\n\nWhy isn't periodically reviewing a portfolio the same as automatically rebalancing it at every review?\n\nWhy is the tolerated deviation threshold tied to the concentration risk a portfolio can accumulate?","bodyHtml":"By the end of this lesson you understand what frequency and criteria guide when to rebalance a portfolio, without it being a rigid time-based rule.
\nThe previous lesson explained why to rebalance. This lesson develops when to do it -- a question with no single answer valid for every portfolio.
\nA first criterion is periodic review: checking the portfolio at some fixed interval -- once a year, for example -- to see if its actual weights have drifted from the target allocation. It's important not to confuse reviewing periodically with automatically rebalancing at every review: reviewing simply means checking whether there's drift; rebalancing only makes sense if the observed drift justifies it. An annual review can perfectly well conclude that no change is needed.
\nA second criterion is deviation, or threshold: instead of setting a date, you define how far an actual weight can drift from its target -- a few percentage points, for example -- before acting, and you rebalance as soon as that threshold is crossed, regardless of the date. Neither criterion is the only valid one: a periodic review with no threshold at all can let an important drift go unaddressed until the next review date, while a threshold with no periodic review to check it never gets applied in practice -- that's why, in practice, both criteria are usually combined: reviewing at some regular interval and acting only if the observed drift exceeds the set threshold.
\nThe greater the drift an investor is willing to tolerate before acting, the greater the concentration risk that can accumulate in the portfolio in the meantime, already covered in the previous module -- the criterion for when to rebalance is directly tied to how much drift from the target allocation, and therefore how much additional risk, one is willing to accept between one correction and the next.
\nAn investor who reviews their portfolio once a year and rebalances only if some weight has drifted more than a few percentage points might, in calm years, make no change -- and in years with sharp moves, correct a notable drift. Another investor who reviews more often but tolerates a wider band before acting might end up rebalancing at a similar frequency, despite reviewing more often.
\nThere's no single frequency or single valid criterion for rebalancing. Periodic review checks whether there's drift; the threshold criterion sets how much drift is tolerated before acting; in practice, both are usually combined. The more drift tolerated, the greater the concentration risk that can accumulate in the meantime.
\nWhy isn't periodically reviewing a portfolio the same as automatically rebalancing it at every review?
\nWhy is the tolerated deviation threshold tied to the concentration risk a portfolio can accumulate?
","sortOrder":2,"readingMinutes":7,"difficulty":"Intermedio","url":"/en/academy/portfolio-management/rebalancing/how-often-and-by-what-criteria-do-you-rebalance"},{"id":79,"moduleId":28,"slug":"what-tax-and-transaction-cost-does-rebalancing-have","title":"What tax and transaction cost does rebalancing have?","summary":"You understand what tax and transaction cost rebalancing a portfolio involves, without going into the investor's specific tax details.","bodyMarkdown":"## Objectives\n\nBy the end of this lesson you understand what tax and transaction cost rebalancing a portfolio involves, without going into the investor's specific tax details.\n\n## Content\n\nThe two previous lessons explained why and by what criteria to rebalance. This lesson closes the module with a question that shapes the previous two: rebalancing isn't free, and that cost is one of the reasons it isn't worth correcting the slightest drift.\n\nRebalancing involves buying and selling assets, which has an explicit transaction cost: the brokerage commission, already covered in Level 1 -- the cost a broker charges for executing an order. Every buy or sell trade needed to bring the portfolio back toward its target allocation can involve this commission, so the more often you rebalance, the more times you pay it.\n\nBesides the transaction cost, rebalancing can have a tax cost: selling a position that has gained value to rebalance the portfolio can generate a gain subject to tax, a real cost that doesn't appear if that position is kept without selling. This module doesn't develop how that cost is calculated or what specific tax rates apply -- investor taxation is covered in detail in the Academy's next content level. What matters here is that this tax cost is real and should weigh, together with the transaction cost, in the decision of how much drift to tolerate before rebalancing.\n\nThis completes the module: rebalancing brings a portfolio back toward its target allocation, preventing it from drifting toward unwanted concentration risk, but both the transaction cost and the tax cost mean it isn't worth correcting every tiny drift -- the criterion for when to rebalance, covered in the previous lesson, exists precisely to balance the benefit of keeping the portfolio aligned against the real cost of achieving it.\n\n## Example\n\nAn investor who rebalances at every tiny drift pays brokerage commissions very frequently and can generate a taxable gain on every trade, even when the drift corrected was small. Another investor who only rebalances once a wider threshold is crossed pays those costs less often, in exchange for tolerating a larger drift in the meantime.\n\n## Common mistakes\n\n- Thinking rebalancing has no cost at all, ignoring the brokerage commission and the possible tax cost of each trade.\n- Thinking the tax cost of rebalancing is always the same, regardless of whether the position sold has gained value or not.\n\n## Summary\n\nRebalancing has a transaction cost -- the brokerage commission on each trade -- and can have a tax cost if a position that has gained value is sold. Both costs are real reasons not to correct every tiny drift, and they justify the threshold criterion covered in the previous lesson.\n\n## Self-check\n\nWhy can rebalancing more often than necessary have a real cost, beyond the time spent doing it?\n\nWhy does the tax cost of rebalancing depend on whether the position sold has gained value or not?","bodyHtml":"By the end of this lesson you understand what tax and transaction cost rebalancing a portfolio involves, without going into the investor's specific tax details.
\nThe two previous lessons explained why and by what criteria to rebalance. This lesson closes the module with a question that shapes the previous two: rebalancing isn't free, and that cost is one of the reasons it isn't worth correcting the slightest drift.
\nRebalancing involves buying and selling assets, which has an explicit transaction cost: the brokerage commission, already covered in Level 1 -- the cost a broker charges for executing an order. Every buy or sell trade needed to bring the portfolio back toward its target allocation can involve this commission, so the more often you rebalance, the more times you pay it.
\nBesides the transaction cost, rebalancing can have a tax cost: selling a position that has gained value to rebalance the portfolio can generate a gain subject to tax, a real cost that doesn't appear if that position is kept without selling. This module doesn't develop how that cost is calculated or what specific tax rates apply -- investor taxation is covered in detail in the Academy's next content level. What matters here is that this tax cost is real and should weigh, together with the transaction cost, in the decision of how much drift to tolerate before rebalancing.
\nThis completes the module: rebalancing brings a portfolio back toward its target allocation, preventing it from drifting toward unwanted concentration risk, but both the transaction cost and the tax cost mean it isn't worth correcting every tiny drift -- the criterion for when to rebalance, covered in the previous lesson, exists precisely to balance the benefit of keeping the portfolio aligned against the real cost of achieving it.
\nAn investor who rebalances at every tiny drift pays brokerage commissions very frequently and can generate a taxable gain on every trade, even when the drift corrected was small. Another investor who only rebalances once a wider threshold is crossed pays those costs less often, in exchange for tolerating a larger drift in the meantime.
\nRebalancing has a transaction cost -- the brokerage commission on each trade -- and can have a tax cost if a position that has gained value is sold. Both costs are real reasons not to correct every tiny drift, and they justify the threshold criterion covered in the previous lesson.
\nWhy can rebalancing more often than necessary have a real cost, beyond the time spent doing it?
\nWhy does the tax cost of rebalancing depend on whether the position sold has gained value or not?
","sortOrder":3,"readingMinutes":7,"difficulty":"Intermedio","url":"/en/academy/portfolio-management/rebalancing/what-tax-and-transaction-cost-does-rebalancing-have"},{"id":84,"moduleId":30,"slug":"how-do-you-periodically-review-a-portfolio","title":"How do you periodically review a portfolio?","summary":"You understand how and when to periodically review a portfolio to keep it consistent with the investor's risk profile and time horizon, beyond rebalancing a drifted position.","bodyMarkdown":"## Objectives\n\nBy the end of this lesson you understand how and when to periodically review a portfolio to keep it consistent with the investor's risk profile and time horizon, beyond rebalancing a drifted position.\n\n## Content\n\nModule 4 already explained when and by what criteria to rebalance a portfolio that has drifted from its target allocation -- by calendar or by deviation threshold. This lesson doesn't repeat those criteria: it covers periodic review in a broader sense, of which rebalancing is only one possible action, not the only one.\n\nPeriodically reviewing a portfolio means checking whether it's still consistent with the investor's risk profile and time horizon -- not just whether each position's weight has drifted from the original allocation. Life circumstances change: a change in income, an approaching financial goal, or a real shift in the investor's risk tolerance can justify reviewing the asset allocation itself, not just readjusting it to the one that already existed. This is different from rebalancing: rebalancing returns the portfolio to an already-decided allocation; reviewing the risk profile and horizon can lead to deciding on a different allocation -- and only then, if warranted, rebalancing toward it.\n\nThe investment plan, already covered in Level 1, is what gives this process discipline: it defines in advance when and by what criteria the portfolio is reviewed, instead of reacting impulsively to a specific market move. Reviewing a portfolio with that discipline reduces the odds that an impulsive decision -- selling out of panic during a drop, or concentrating the portfolio in whatever has performed best recently -- replaces the judgment already built in the earlier modules.\n\nThe periodic review is also the moment to reconsider the accumulated tax cost, already covered in Module 5: a review that ignores the capital gain generated by a sale, or the possibility of applying loss offsetting, can generate more tax cost than necessary without really improving the portfolio.\n\n## Example\n\nAn investor reviews their portfolio once a year, according to their own investment plan. In one of those reviews, they notice their time horizon has shortened significantly -- the moment they'll need that money is approaching -- and decide, for that reason, to reduce the weight of stocks in their asset allocation. This isn't a rebalancing toward the previous allocation, but a review that changes the target allocation itself.\n\n## Common mistakes\n\n- Confusing \"reviewing the portfolio\" with \"rebalancing the portfolio\" -- reviewing can lead to changing the target allocation; rebalancing always returns to an already-decided allocation.\n- Reviewing the portfolio reactively, only when the market moves sharply, instead of with the discipline set by the investment plan.\n- Selling positions during a review without considering the tax cost of that sale or the possibility of applying loss offsetting.\n\n## Summary\n\nPeriodically reviewing a portfolio means checking whether it's still consistent with the investor's risk profile and time horizon -- not just whether it has drifted from its target allocation. Rebalancing, already covered in Module 4, is one possible action resulting from that review, not the whole review. The investment plan gives the process discipline, and the accumulated tax cost should be considered at every review.\n\n## Self-check\n\nWhy isn't reviewing a portfolio the same as rebalancing it?\n\nWhy is it worth reviewing a portfolio with the discipline set by an investment plan, instead of reacting to a specific market move?","bodyHtml":"By the end of this lesson you understand how and when to periodically review a portfolio to keep it consistent with the investor's risk profile and time horizon, beyond rebalancing a drifted position.
\nModule 4 already explained when and by what criteria to rebalance a portfolio that has drifted from its target allocation -- by calendar or by deviation threshold. This lesson doesn't repeat those criteria: it covers periodic review in a broader sense, of which rebalancing is only one possible action, not the only one.
\nPeriodically reviewing a portfolio means checking whether it's still consistent with the investor's risk profile and time horizon -- not just whether each position's weight has drifted from the original allocation. Life circumstances change: a change in income, an approaching financial goal, or a real shift in the investor's risk tolerance can justify reviewing the asset allocation itself, not just readjusting it to the one that already existed. This is different from rebalancing: rebalancing returns the portfolio to an already-decided allocation; reviewing the risk profile and horizon can lead to deciding on a different allocation -- and only then, if warranted, rebalancing toward it.
\nThe investment plan, already covered in Level 1, is what gives this process discipline: it defines in advance when and by what criteria the portfolio is reviewed, instead of reacting impulsively to a specific market move. Reviewing a portfolio with that discipline reduces the odds that an impulsive decision -- selling out of panic during a drop, or concentrating the portfolio in whatever has performed best recently -- replaces the judgment already built in the earlier modules.
\nThe periodic review is also the moment to reconsider the accumulated tax cost, already covered in Module 5: a review that ignores the capital gain generated by a sale, or the possibility of applying loss offsetting, can generate more tax cost than necessary without really improving the portfolio.
\nAn investor reviews their portfolio once a year, according to their own investment plan. In one of those reviews, they notice their time horizon has shortened significantly -- the moment they'll need that money is approaching -- and decide, for that reason, to reduce the weight of stocks in their asset allocation. This isn't a rebalancing toward the previous allocation, but a review that changes the target allocation itself.
\nPeriodically reviewing a portfolio means checking whether it's still consistent with the investor's risk profile and time horizon -- not just whether it has drifted from its target allocation. Rebalancing, already covered in Module 4, is one possible action resulting from that review, not the whole review. The investment plan gives the process discipline, and the accumulated tax cost should be considered at every review.
\nWhy isn't reviewing a portfolio the same as rebalancing it?
\nWhy is it worth reviewing a portfolio with the discipline set by an investment plan, instead of reacting to a specific market move?
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