Thanks!
What about inflation? Is it worth it? I'm also concerned about taxes. Does the government tax the interest? Is it counted as an asset, even before they are cashed in?
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Points in their favor:
They are very very low risk
You can buy them in small denominations, as low as $25, so if you aren't good a saving large amount of money, you can save small amounts often.
You can buy them at any bank and cash them in at any bank. No broker or other financial professional needed.
Mixed bag
Interest rate is fixed. Inflation will diminish your profits (relative to other more flexible investments). Deflation will make you richer (again relative to other more flexible investments)
You pay tax on them when you cash them in. This gives you some flexibility in that you can cash them in when you have a lower earning year and are in a lower tax bracket.
Points against them
Your money is locked up for a long time. Other investments often offer better interest rates.
Another simple option available at your bank is certificate of deposit (CD). These pay interest but have maturity terms ranging from 6 months to several years. If you need more flexibility and want to keep it simple, this might work for you, although most CDs require at least $500.