from now on vs onward

from now on

adv

  • Starting from this moment and continuing indefinitely. 

onward

adv

  • In a forward direction. 

adj

  • Moving forward. 

  • Advanced in a forward direction or toward an end. 

verb

  • To keep going; to progress or persevere. 

How often have the words from now on and onward occurred in a corpus of books? (source: Google Ngram Viewer )