Inheritance tax (IHT) thresholds would be £270,000 higher by the 27/28 tax year if they had risen in line with inflation, according to new analysis. The £325,000 nil rate band for IHT would be set at £537,000 by the 27/28 tax year while the £175,000 resident nil rate band would be £233,000 if both had indexed in line with inflation,