How liquid are ETFs to move in and out?

I am looking to invest in an S&P 500 ETF and am wondering about its liquidity. Specifically, how easy is it to jump in and out of an ETF? Are there ETFs for the purpose of "parking" your money while the market is down, something that is essentially very low risk (and low gains) should the market start heading down, but then I can jump back into the S&P 500 index as the market rebounds? I don't want to take the money out of ETFs. I know that several S&P 500 ETFs have very low annual costs (i.e. IVV is right around .04%), but what are the typical costs of jumping in and out of different ETFs?

Financial Planning, Investing, ETFs
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June 2017
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Trying to time the market is very dangerous due to unexpected growth or recessions. However, you can get a "discounted" price from temporary drops if you have an automatic monthly contribution. While an S&P 500 or Index ETF can be a great portfolio addition, it would be prudent to diversify risk with others as well such as growth, value, and international funds. Low-cost and historically high performing funds (no transaction fees and low expense ratios) are selected and rebalanced for you automatically based on your goals and time horizon with a managed portfolio at Betterment.

June 2017
June 2017
June 2017
June 2017