Savings I Bonds May 2017 Update: 1.98% Inflation Rate

savbonds4Savings I Bonds are a low-risk investment backed by the US Treasury that pay out a variable interest rate linked to inflation. You could own them as a replacement for cash reserves (they are liquid after 12 months) or bonds in your portfolio. New inflation numbers were just announced at, which allows us to make an early prediction of May 2017 savings bond rates a couple of weeks before the official announcement on the 1st. This also allows us the opportunity to know exactly what a April 2017 savings bond purchase will yield over the next 12 months, instead of just 6 months.

New Inflation Rate
September 2016 CPI-U was 241.428. March 2017 CPI-U was 243.801, for a semi-annual increase of 0.98%. Using the official formula, the variable component of interest rate for the next 6 month cycle will be approximately 1.96%. You add the fixed and variable rates to get the total interest rate. If you have an older savings bond, your fixed rate may be very different than one from recent years.

Purchase and Redemption Timing Reminder
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 though, since if you wait too long your effective purchase date may be bumped into the next month.

Buying in April 2017
If you buy before the end of April, the fixed rate portion of I-Bonds will be 0.0%. You will be guaranteed the current variable interest rate of 2.76% for the next 6 months, for a total 0.00 + 2.76 = 2.76%. For the 6 months after that, the total rate will be 0.00 + 1.96 = 1.96%.

Let’s say we hold for the minimum of one year and pay the 3-month interest penalty. If you theoretically buy on April 30th, 2017 and sell on April 1, 2018, you’ll earn a ~2.04% 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 ~2.02% annualized return for a 14-month holding period. Compare with the current highest 1-year bank CD rates of roughly 1.5% and online savings accounts rates of roughly 1%.

Buying in May 2017
If you wait until May, you will get 1.98% plus an unknown fixed rate for the first 6 months. The fixed rate is likely to be either zero or 0.1%. Every six months, your rate will adjust to the fixed rate plus a variable rate based on inflation. If inflation picks up, you’ll get a hiked rate earlier than versus buying in April.

The primary reason to wait until May is that the current fixed rate is zero and it has a small chance of going up in May. I would personally rather lock in the solid 12-month return by buying in April rather than chase a possible 0.1% long-term bump. I plan on buying my annual limit this week, and I intend to hold these indefinitely for the reasons listed below.

Existing I-Bonds and Unique Features
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 + variable rate (minimum floor of 0%). Due to their annual purchase limits, you should still consider their unique advantages before redeeming them. These include ongoing tax deferral, exemption from state income taxes, and being a hedge against inflation (and even a bit of a hedge against deflation).

Annual Purchase Limits
The annual purchase limit is now $10,000 in online I-bonds per Social Security Number. For a couple, that’s $20,000 per year. Buy online at, after making sure you’re okay with their security protocols and user-friendliness. You can also buy an additional $5,000 in paper bonds using your tax refund (see IRS Form 8888). If you have children, you may be able to buy additional savings bonds by using a minor’s Social Security Number.

For more background, see the rest of my posts on savings bonds.


Savings I Bonds May 2017 Update: 1.98% Inflation Rate from My Money Blog.

©, 2017.

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