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 range7 k2 f$ U6 b% u+ K \
from 35% to 42% of gross income. 6 a5 @2 }# _5 h4 @1 o) ~GDSR(gross debt service ratio)=(payment of principal and interest on mortgage+property taxes+heating costs+50% of condominium fees)/gross income.