I generally dislike variable annuities, but there are pros and cons. A variable annuity is an insurance product. It is basically a contract which acts as a wrapper that goes around a set of mutual fund options that are available in the variable annuity contract.
Pros:
-Variable annuities offer tax deferrals, taxes on gains are not paid until money is taken out. This is redundant if the variable annuity is within an IRA or a 401k plan as these plans already offer tax deferral.
-Variable annuities often provide an added level of guarantees. This depends on the variable annuity purchased. often times the insurance company will guarantee a certain amount of money annually that may be withdrawn and/or a will guarantee a certain death benefit to any named beneficiaries no matter what happens in the stock market. This is the appeal for many fearful investors and is one of the reasons people often are sold variable annuities.
Cons:
-Like any insurance contract, there is a premium paid for additional protections. Variable annuities are very expense and can average between 2%-5% per year depending on the options selected. These expenses can often exceed any gains from your portfolio and will affect your long term investment performance negatively.
-The guarantees offered by the insurance company are only as good as the insurance company itself. If a financial mega-catastrophe were to happen, not only would your variable annuity account be lower due to a stock market crash, but the insurance company who sold you your variable annuity may also be on the verge of collapse. This may make it difficult for the company to pay you the benefits that it guaranteed you.
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I personally would avoid variable annuities. People are often easily persuaded to purchase variable annuities for their "insurance" against market loss. However the expenses and risks are not often well explained by the sales person. Variable annuities also generate very large sales commissions (often between 5% and 9% of total assets) so insurance agents love to sell them.
I would probably invest in the 401k up to the match, and then go elsewhere with the rest of your savings. Read your 401k plan documents to learn more about the expenses and options associated with the variable annuity. You may even have the opportunity to opt out of many of the costly features.
Good luck!