Savings I Bonds are a unique, low-risk investment backed by the US Treasury that pay out a variable interest rate linked to inflation. 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 2018 CPI-U was 249.554. September 2018 CPI-U was 252.439, for a semi-annual increase of 1.16%. 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 known “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 2018. If you buy before the end of October, the fixed rate portion of I-Bonds will be 0.30%. You will be guaranteed a total interest rate of 2.52% for the next 6 months (0.30 + 2.22). For the 6 months after that, the total rate will be 0.30 + 2.32 = 2.62%.
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 April 30th, 2018 and sell on April 1, 2019, you’ll earn a ~2.09% annualized return for an 11-month holding period, for which the interest is also exempt from state income taxes. If you held for three months longer, you’d be looking at a ~2.20% annualized return for a 14-month holding period (assuming my math is correct). Compare with the
Buying in November 2018. If you buy in November 2018, you will get 2.22% 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, which has been rising a bit. The current real yield of 5-year TIPS now about ~1.00%. My best guess is that it will be 0.50% or 0.60%. Every six months, your rate will adjust to your fixed rate (set at purchase) plus a variable rate based on inflation.
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 (minimum floor of 0%).
Buy now or wait? In the short-term, these I bond rates will not beat a top 12-month CD rate if bought in October, and probably won’t if bought in November unless inflation skyrockets. Thus, I probably wouldn’t buy in October. I haven’t bought any savings bonds yet this year, and will wait until November to see what the new fixed rate will be. If it greatly lags the real yield on
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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