Savings I Bonds are a unique, low-risk investment backed by the US Treasury that pay out a variable interest rate linked to inflation. With a holding period from 12 months to 30 years, you could own them as an alternative to bank certificates of deposit (they are liquid after 12 months) or bonds in your portfolio.
New inflation numbers were just announced at
New inflation rate prediction. March 2020 CPI-U was 258.115. September 2020 CPI-U was 260.280, for a semi-annual increase of 0.84%. Using the
Tips on purchase and redemption. You can’t redeem until 12 months have gone by, and any redemptions within 5 years incur an interest penalty of the last 3 months of interest. A simple “trick” with I-Bonds is that if you buy at the end of the month, you’ll still get all the interest for the entire month as if you bought it in the beginning of the month. It’s best to give yourself a few business days of buffer time. If you miss the cutoff, your effective purchase date will be bumped into the next month.
Buying in October 2020. If you buy before the end of October, the fixed rate portion of I-Bonds will be 0%. You will be guaranteed a total interest rate of 0.00 + 1.06 = 1.06% for the next 6 months. For the 6 months after that, the total rate will be 0.00 + 1.68 = 1.68%.
Let’s look at a worst-case scenario, where you hold for the minimum of one year and pay the 3-month interest penalty. If you theoretically buy on October 31st, 2020 and sell on October 1, 2021, you’ll earn a ~1.04% annualized return for an 11-month holding period, for which the interest is also exempt from state income taxes. If you theoretically buy on October 31st, 2020 and sell on February 1, 2022, you’ll earn a ~1.10% annualized return for an 15-month holding period. Comparing with the
Buying in November 2020. If you buy in November 2020, you will get 1.68% plus a newly-set fixed rate for the first 6 months. The new fixed rate is unknown, but is loosely linked to the real yield of short-term TIPS. In the past 6 months, the
If you have an existing I-Bond, the rates reset every 6 months depending on your purchase month. Your bond rate = your specific fixed rate (set at purchase) + variable rate (total bond rate has a minimum floor of 0%).
Buy now or wait? The fixed rate is most likely going to be zero for October and November purchases, and so I would personally wait until November and get the 1.68% inflation and unknown inflation rate after that, betting that it will be higher than 1.06%. Either way, it seems worthwhile to use up the purchase limit for 2020 as the rates will at least be slightly higher than other cash equivalents.
Unique features. I have a separate post on
Over the years, I have accumulated a nice pile of I-Bonds and now consider it part of the inflation-linked bond allocation inside my
Annual purchase limits. The annual purchase limit is
For more background, see the rest of my
[Image: 1946 Savings Bond poster from US Treasury –
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