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To have TDS deducted, employees must submit income and investment information to their employer annually.
Know more about employee investment declaration (aka IT declaration), what, why, when and how along with the forms to be submitted.

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Employee Investment Declaration will be submitted at the beginning of financial year or whenever employee joins any new organization.
Generally, if employees opt for old tax regime, they are required to submit declaration at the beginning of financial year. However, they are required to submit the proofs of their declared investments around Dec-Jan every year. If they fail to submit the proofs, employer will recompute the tax without considering those investments and the entire tax will be deducted from Dec to March Salary. This will result in huge TDS deduction and less take home.
W.e.f 01st April 2026, the employees are required to furnish the "relationship with landlord" to claim HRA exemption under the old tax regime in Form 124 (Form 12BB earlier)
Disclaimer: This article provides an overview and general guidance, not exhaustive for brevity. Please refer Income Tax Act, GST Act, Companies Act and other tax compliance acts, Rules, and Notifications for details.