Where do I enter the amount $1257 on line 31260? I can't find the form or page that has that line (use to be line 363)?

When you enter your income on lines 10100 and/or line 10400, the Canada employment amount on line 31260 will automatically populate, the image below will guide you:

For more detailed information on this amount, please review the following link from the CRA:

• Line 31260 – Canada employment amount