Good assessment. The cost of not just a government guarantee BUT ALSO "protection" from inflation is extreme. Whether it makes sense for you to pay that extreme cost in a portion of your portfolio is obviously up to you. But an informed decision requires that the investor understands 1) the mechanism of the inflation compensation offered by TIPs and 2) the consequent taxes and cash flows. It's my opinion that folks who only look at pop articles and the published yields of TIPs can easily make painful choices.
1. TIPs are government securities. Their market prices rise and fall with interest rates. Pull up a chart of TIP that is a portfolio of TIPs. When inflation skyrocketed and Fed tightened '22-'24, TIP FELL from 130 to 105. One can always duck behind "I never sell," but at least observe that the time to buy TIPs at the lowest prices is when inflation PEAKS and falls ---- not before inflation rises. Expected?
2. The coupon rate on TIPs does not change. You are compensated for inflation by additions to the principal, the final payment --- and those dollars are not captured until maturity. But here is the killer:
Imagine a TIP like the current 10 year with a coupon at 1.88%. Let's see what happens when that $100,000 bond gets compensated for (wow!) 5% inflation. This is rough for illustration.
First year (say) 100,000 × .0188 gives you a cash flow of $1880
Second year 105,000 × .0188 gives you $1974, so that year you get an extra $94
BUT BUT BUT you must ALSO pay taxes on the $5000 add-on that year. If you are only in a 12% bracket, your tax will be $600. So your "inflation protecting" TIP caused you to have a NEGATIVE CASH FLOW of $506. Is that what you had in mind or expected?
Regards, Dick