JustLiz asked,
"What is the Jewish position on the afterlife?"
To which
shalom replied,
"A mixed bag actually - but more importantly, the 'next life' is not a major focus of Judaism."
While this is true, that doesn't necessarily mean the Jews left the question, "What happens when we die?" unanswered.
I have been told the following is a fair assessment of what happens when we die.
When we die, we pass from this existence to the Presence of G-d. There can be no greater reward for a G-d--fearing person than that. There can also be no greater punishment for the sinner than that. Either way, every thought, every action, every failure to take action, is an open book to HaShem, and when you are in His Presence, you will come to know exactly what that means. Until then, we can only guess.
Good deeds you have performed will be rewarded. Trust in that; it's true. The Divine Judge can be counted upon to be Just. But always remember, G-d is also Merciful.
Sins that you have committed unintentionally, but have already repented of because you fear G-d, will not be remembered or counted against you. As scripture says, G-d becomes a Shield for the penitent.
Sins you have committed unintentionally, but not repented of, will have to be atoned for, but that is not as harsh as it might sound. Your sins will be burned away from your soul in a process that (it is said) takes up to eleven months. As I understand it, the worse the sin, the more unpleasant the process of "burning away" the sin is. This is probably where the Catholics got their concept of "Purgatory."
Sins you have committed intentionally, but have not repented of, are dealt with much more harshly than unintentional sins, but if you merit any reward because of good deeds, all is not yet lost. You may be allowed another chance to return to Earth in another life and atone for, or reverse your error there. A Jew who falls into apostasy, such as accepting Jc as his savior, will probably be afforded this kind of opportunity.
A person who has racked up more and worse sins than good deeds is facing a more severe punishment yet, but even that is a mercy. "The soul that sins, it shall die." The unrepentant and intentional sinner's soul is snuffed out like the flame on a candle. The blessings he enjoyed on Earth are his only reward. "The day he dies, his thoughts perish." as Psalm 146 says.
Sins that you have committed, but repented of because you Love G-d, will be counted as if they were
mitzvoth, since they are intentional acts you committed on your path to learning of, and serving the One True G-d.
Making restitution, giving charity, visiting the sick, and fasting can all affect the scales, and balance out sins, or even outweigh your sins.
For a better explanation, Aish HaTorah has a piece called, "What happens when you die? And how can the way you're living now affect that eternal reality?" at
http://aish.com/