السلام عليكم ورحمة الله وبركاته
The punishment to SUICIDE IS ETERNITY IN HELL... No paradise for those who commit suicide.
The Prophet Muhammad (SAW) also assigns suicide to the lower levels of Hell.
Allah says explicitly in the Quraan,
"And do not kill yourselves. Surely, Allah is Most Merciful to you". (Surah An-Nisa Verse 29)
In another verse of the Quraan, Allah says:
"And do not throw yourselves in destruction". (Surah Al-Baqarah Verse 195)
Narrated by Jundub: The Prophet (SAW) said, "A man was inflicted with wounds and he commited suicide, and so Allah said: My slave has caused death on himself hurriedly, so I forbid Paradise for him."
Narrated by Abu Hurairah (RA): The Prophet (SAW) said, "He who commits suicide by throttling shall keep on throttling himself in the Hell-fire (forever), and he who commits suicide by stabbing himself, he shall keep stabbing himself in the Hell-fire (forever)."
From the sayings of Allah and his Prophet (SAW), we can see suicide is not accepted in Islam
For more:
http://www.inter-islam.org/Prohibitions/suicide.html