While headline inflation has decelerated significantly across advanced economies in the past two years, services inflation has remained high. This box examines the key factors influencing services inflation in the United States and the United Kingdom, highlighting the role of labour market tightness and catch-up dynamics in non-rent services inflation, and the contribution of rent inflation to overall services inflation. Looking ahead, services inflation is expected to moderate amid a lower contribution from catch-up inflation dynamics, a cooling of labour markets and decreasing inflation for new rental agreements.