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How to rebalance a portfolio without moving money into losing investments
If you are making regular periodic investments (e.g. each pay period into a 401(k) plan) or via automatic investment scheme in a non-tax-deferred portfolio (e.g. every month, $200 goes automatically from your checking account to your broker or mutual fund house), then one way of rebalancing (over a period of time) is to direct your investment differently into the various accounts you have, with more going into the pile that needs bringing up, and less into the pile that is too high. That way, you can avoid capital gains or losses etc in doing the selling-off of assets. You do, of course, take longer to achieve the balance that you seek, but you do get some of the benefits of dollar-cost averaging.