Section 35(2AB) of the Income-tax Act, 1961 provides for a weighted tax deduction for companies engaged in scientific research and development. This section allows companies to claim a deduction of 200% of the expenditure incurred on in-house research and development facilities, provided these facilities are approved by the Department of Scientific and Industrial Research (DSIR). The deduction applies to expenses such as salaries of research personnel, cost of materials, and other operational costs directly related to R&D activities. This provision is significant as it incentivizes innovation and technological advancement by reducing the effective cost of research activities. To qualify, companies must maintain separate accounts for R&D expenditure and obtain necessary approvals and certifications from DSIR. The burden of proof lies with the taxpayer to demonstrate that the expenses are genuinely incurred for eligible R&D activities.