The best replacement for itin is ssn.

The best alternatives to itin are rated as following:
★★★★★  ssn
★★★  ein
★★  tin
★★  social security number
  atin
  fein
  ptin

Your alternative for itin is not listed? Suggest!
Speaking about itin, one probably shouldn't forget about tax return.

Other search terms related to itin and their ratings are:
★★★★★ tax return
★ tax returns
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itin
ssn
ein