section 80c deductions: Claiming deductions under sections 80C to 80U under old tax regime while filing ITR
Do keep in mind that those individuals who are planning to opt for a new, concessional tax regime will not be able to claim the common deductions such as Section 80C, 80D, 80DD etc. Here is how to claim these common deductions while filing ITR. It is possible that these deductions are already pre-filled in your ITR form. Make sure to cross-check the amount pre-filled in the ITR form.
Source: indiatimes.com