Greetings,
While it's not generally a mandatory requirement to submit a new income certificate to your college every year, it's essential to check your college's specific rules and regulations.
Income certificates usually have a validity period. If your old certificate is still valid, you might not need a new one but, if you're applying for scholarships based on your EWS category, you might need to submit a recent income certificate.
You can go through the following steps:

1. Check Your College's Rules: Contact your college's administration or the concerned department to inquire about their specific requirements for income certificates.

2. Verify Certificate Validity: Check the validity period mentioned on your old income certificate.

3. Apply for a New Certificate (if needed): If your old certificate is expired or your college requires a new one, initiate the process of obtaining a fresh income certificate.