Anyone have guidance on whether to buy these before or after November 1st?
Tipswatch says before, and I'm not sure I understand why.
I bought the maximum amount of i-bonds this summer, reasoning that the 3.54% was way above the return on comparable safe investments and even back then it was already looking as if the November inflation adjustment would be well above 5%.
It's not as clear cut now. True, you can buy in October and get the same deal I found attractive this summer, but the problem is that you are committing yourself to a fifteen month holding period. The Treasury will allow you to cash your i-bonds in 12 months, but the penalty would cost you three months interest at 7.12%. To get the full benefit of the 7.12% rate, you need to hold for 15 months, so that the penalty is three months assessed at the May, 2022 inflation adjustment (which will presumably be smaller than 7.12%). Purchases made after November 1 don't have this problem. You can cash them in after 12 months and get a full six months at 7.12%.
One reason to buy now rather than wait until November is that it's a sneaky way to get more money invested at 7.12%. I-bond interest compounds semiannually, so $10,000 invested at 3.54% grows to $10,177 before the 7.12% begins. Wait until November and you have only $10,000 invested.
I mentioned in another post the possibility of the Feds reducing the fixed rate below zero in November. I, like most people, don't expect a negative fixed rate, but this is an expectation, not a guarantee. If you have any concern about a negative fixed rate you should buy in October.
Over the years I have bought i-bonds several times after a spike in interest rates and then cashed them in when CPI subsided. That way the three month interest penalty didn't cost me too much. (One time the penalty was 0% for three months, so I lost no money, just had to hold for an extra three months.) I expect to do so again, but perhaps we are in store for a prolonged period of high inflation. I wouldn't mind at all if i-bonds turn out to be a good long term investment, not just a way to get above market interest for a year.