Match the horizon before comparing rates
A ten-year nominal yield of 4.0% and a comparable real yield of 1.5% imply a 2.5 percentage-point breakeven spread. These are illustrative values, not current quotes. Both yields must use compatible conventions and observation dates.
A ten-year breakeven covers the next ten years. A five-year forward rate starting in five years concerns years six through ten. Neither should be compared as if it were a one-year survey forecast.
Does a rising breakeven mean inflation will rise?
Not necessarily. Expected inflation may have risen, but changes in risk premia and bond liquidity can also move the spread. Compare the change with survey evidence and the underlying nominal and real yields.
Is nominal yield minus current inflation a real bond yield?
It is a backward-looking approximation using recently measured inflation. An inflation-linked yield concerns future cash flows tied to a specified price index. Keep the horizon and definition explicit.
Methodology: Federal Reserve research on inflation risk and TIPS liquidity premia.