Русско-англо-русский юридический словарь

debt service costs/payments" (Cambridge Dictionary of American Idioms)

As the national debt escalates, courtesy of £100bn-plus annual deficits, and as interest rates inevitably rise, we’ll soon be spending more on government debt service than on state education. (The Telegraph)

Progress has been made on the overall debt burden of developing countries, with the proportion of external debt service to export revenue falling from 12% in 2000 to 3% in 2013. (The Guardian)

debt service (also debt servicing): the act of regularly paying back a debt, including interest (Cambridge Business English Dictionary)