Salaat is one of five pillar of Islam. It is obligatory that you pray your salaat on time.
Hadrat Abu Huraira (may Allah be pleased with him) said: The Prophet (may Allah’s blessings and peace be upon him) said, “Let anyone tell me; if a stream flows by the house of any person and he baths in it five times a day, whether any dirt will remain on his body.” The companions replied that no dirt would remain in such a case. He said, “So is the case with prescribed prayers. Allah forgives men’s sins (minor) on their account.” (Bukhari, Muslim)