Oscar winner Paul Haggis finalized his divorce, but his now ex-wife will continue reaping the benefits of his success.  

The "Crash" director reached his divorce settlement with Deborah ... and according to the docs, he'll pay her $20k a month in spousal support. The exes have a 17-year-old son, and Paul will pay another $5k per month for child support, and foot the bill for the kid's schooling -- high school and college.

Additionally, the settlement calls for Deborah to get a hefty slice of Haggis' income -- 20% of anything he makes over $1.2 million per year. That's on top of the monthly $20k check.

Paul's walking away with one of their 2 NYC SoHo apartments and 3 Florida properties.