1.4m over-60s near IHT limitHMRC data shows that around 1.4m people over the age of 60 are on the cusp of being liable for inheritance tax. Analysis by insurer NFU Mutual shows that 9% of over 60s have wealth at or just over the tax-free threshold, warning that 54% of these have little understanding of IHT rules. Sean McCann from NFU Mutual said IHT rules are "fiendishly complex, feared by many and understood by few".