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 6 e4 Z3 h9 { B; b9 D4 r; k. hfrom 35% to 42% of gross income. 7 u7 R" B q+ i" R5 P( C) R) AGDSR(gross debt service ratio)=(payment of principal and interest on mortgage+property taxes+heating costs+50% of condominium fees)/gross income.