Interest plus amortisation of the private non-financial sector as a share of income. The BIS series for the United Kingdom runs from 1999; it peaked at 19.6 % in 2007–08 and stood at 12.9 % in Q1 2026.
Threshold source: worldstat.us construction after Drehmann and Juselius (2012), BIS. How thresholds are chosen
Assumes a standard maturity for all debt.