TDSR(Total debt service ratio)=(payment of principal and interest on mortgage+property tax +heating costs+50% of condominium fees+payments on other personal loan)/grss income. TDSR guidelines Currently range - [, O( B5 S$ p. f; ]2 e% wfrom 35% to 42% of gross income. 7 |$ B+ ?% ?7 c2 j' ?7 PGDSR(gross debt service ratio)=(payment of principal and interest on mortgage+property taxes+heating costs+50% of condominium fees)/gross income.