from now on; hereafter; in the future
Refers to the time starting from the present moment onward. Used in both formal and everyday contexts, often in statements about plans, intentions, or predictions.
I'll be more careful from now on.
今後の予定について話し合いましょう。
Let's discuss our plans for the future.
We all discussed our policy going forward.
This issue remains as a future challenge.
I have high hopes for his future.
From now on, I plan to submit a monthly report.
今後 always means 'from now into the future', while 以降 can attach to any past, present, or future reference point.
今後 means 'from now on' and covers an ongoing stretch of future time, while 今度 in its future sense usually points to one specific upcoming occasion.