Updated October 5, 2026 · Portfolio maintenance · U.S. investor education
A portfolio review is a decision process. It does not have to end with a trade.
Review a long-term investment plan by checking whether the goal and cash needs changed, reconciling contributions and withdrawals, measuring the current investment mix, and examining costs before taking action. Rebalancing is one possible response to a changed allocation; it is not the entire review.
Need a plan to review? Use the investment-plan worksheet first. For the underlying concepts, read the long-term investing guide. This article focuses on maintaining the plan after it exists.
1. Start with the purpose of the money
Open the written plan before opening a list of recent winners and losers. Check the next expected withdrawal, the size of the expense, the contribution schedule and the money reserved outside the portfolio. A changed goal can justify revisiting the target allocation; a price move alone does not tell you what that new target should be.
Ask whether a loss would now interfere with a commitment that was previously flexible. Also ask whether a new obligation or reduced income changes what you can contribute. Record the difference between a change in your circumstances and a change in market prices. They may call for different responses.
2. Reconcile the account before judging performance
A higher ending balance is not necessarily an investment gain. List beginning value, money added, money removed and ending value for the same group of accounts. Keep transfers between accounts within that group from becoming both a new contribution and a withdrawal from the overall plan.
A $4,000 balance increase can hide a loss
Suppose a hypothetical account starts at $40,000, receives $6,000 of contributions and ends at $44,000, with no withdrawals. The change after contributions is $44,000 − $40,000 − $6,000 = −$2,000. An exact investment-return percentage also needs the timing of the cash flows.
Keep the accounting boundary consistent. Cash dividends retained inside the measured account are already part of its cash balance; do not add them again. Distributions paid out of that boundary need to be recorded as withdrawals. Fees deducted inside the account affect the ending balance, while charges paid elsewhere may require separate treatment.
Check confirmations and statements for transactions you do not recognize. FINRA’s brokerage-account guidance explains the importance of reviewing account information. A mismatch is a reason to investigate before placing another order.
3. Measure the current mix using current values
For each category, divide its current value by the current portfolio total. Use one valuation date where possible. Compare the resulting percentage with the target in the written plan, then examine holdings overlap and concentration within categories. “Several funds” does not necessarily mean several distinct exposures.
The SEC explains allocation drift and rebalancing: differing investment returns can move a portfolio away from its intended mix. Bringing it back can involve sales, purchases or new money. The examples below illustrate the arithmetic, not an allocation recommendation.
A rebalancing example: trade $4,800 or add $8,000?
Imagine a $100,000 portfolio with a documented 60% stock and 40% bond target. The stock portion rises from $60,000 to $72,000 while bonds remain at $40,000. There are no distributions, costs or other cash movements in this invented example.
The portfolio is now worth $112,000. Stocks represent $72,000 ÷ $112,000 = approximately 64.29%. That is 4.29 percentage points above the 60% target, not a statement that the stock holdings earned 4.29%.
Swipe to compare two different ways to restore the example target.
| Situation | Stock value | Bond value | Total | Stock weight |
|---|---|---|---|---|
| Before the review | $72,000 | $40,000 | $112,000 | 64.29% |
| Sell $4,800 of stocks; buy bonds | $67,200 | $44,800 | $112,000 | 60% |
| Instead, add $8,000 to bonds | $72,000 | $48,000 | $120,000 | 60% |
For the trading route, the target stock value is 60% × $112,000 = $67,200. The difference from $72,000 is $4,800. For the contribution-only route, $72,000 must be 60% of the new total: $72,000 ÷ 0.60 = $120,000, requiring $8,000 of additional money.
These are alternatives, not two instructions to perform together. Adding $8,000 assumes that extra cash is available and belongs in this plan. Actual execution can differ because of price changes, taxes, fees, purchase increments and available investments. There is no need to force an exact target using money reserved for another purpose.
4. Check consequences before acting
Identify the account where a proposed sale would occur, the relevant tax lots and the estimated costs. Selling an appreciated investment in a U.S. taxable account can realize a capital gain; the applicable treatment depends on the circumstances. IRS Topic 409 explains capital gains and holding-period distinctions. Sales inside a retirement account require a different analysis from withdrawals out of it.
Do not judge a proposed switch only by one expense ratio. Consider trading costs, account charges, the investments’ actual exposures and any costs of leaving the existing product. The SEC’s fee guidance provides questions for comparing the costs involved.
Using new contributions or cash distributions may reduce the need to sell, but it may not fully correct the drift. Where tax treatment, withdrawals or a complex holding are unclear, resolve those questions with an appropriately qualified professional before execution.
5. Choose a review rule, not a daily reaction
Write down when the next review occurs and which events justify an earlier one. A calendar rule and a rule based on a preset allocation deviation are different approaches; the SEC’s allocation guidance describes both. Neither establishes one universally correct review interval or threshold.
Keep reviewing separate from trading. The outcome might be to maintain the existing investments, change future contributions, investigate a new expense, or update the goal itself. A target-date fund may rebalance its own holdings, but that does not automatically coordinate every other investment you own.
After an action, verify the executed amount and resulting cash and holdings. Save the reason, date and supporting records. When the decision is to make no change, record why the existing plan still fits rather than leaving an unexplained blank.
Your portfolio-review checklist
- Goal: Confirm the purpose, withdrawal timing and flexibility.
- Records: Reconcile contributions, withdrawals, transfers and statements.
- Exposure: Measure allocation and investigate overlapping holdings.
- Consequences: Check tax treatment, costs and available cash before acting.
- Decision: Document an action or the reason no change is needed.
- Follow-through: Verify execution and set the next review trigger.
Use the rebalancing tool to explore allocation inputs, and the fee comparison tool to test cost assumptions. They are educational aids, not account-level trade instructions or tax calculations. Compare their methodology with the question you are trying to answer.
Keep the working plan up to date
Return to the investment-plan worksheet to record changes. For a portfolio that funds expenses through dividends, also review payment timing and dividend-cut scenarios.
Sources and calculation notes
Reviewed October 5, 2026 using the linked SEC Investor.gov, IRS and FINRA materials. The balance-change and rebalancing examples are original hypothetical calculations. Portfolio weights are rounded to two decimal places. No allocation, threshold, trade or expected return is recommended.
Educational information only, not individualized investment or tax advice. Rebalancing does not eliminate investment risk or guarantee better returns.