If you have an extra paycheck paid every 5 months, you should definitely not include it in your budget.
You can't count monthly on the money you don't actually have.
Here are some things you should include:
→ Your monthly income (from various sources, in case you have more than one job)
→ Expenses under multiple heads (e.g: Household, Food).
→ Estimated costs that you may incur under each expense head.
Watch this funny video on budgeting to get the feeling of what should be included in it. It takes a little more than 3 min.
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Reference: Ultimate Financial Guide Personal Finance Demystified by Nikhil Kale. Ultimate FinPlan; 1st edition. 2021