The current company must be provided with the salary and tax saving investments details of the previous company so that they can adjust TDS accordingly. Otherwise, the current company in which you are now working may be unaware of the previous income and deductions, which may lead to lower TDS and interest on the extra tax to be paid when filing is done. Providing the previous employer’s Form 16, salary details, and investment declarations can help the new employer calculate the overall tax liability correctly. This also helps ensure that the total TDS deducted during the financial year is properly accounted for and reduces the chances of a tax shortfall at the time of filing the return. If required, professional TDS return filing services can also help review the deduction details and identify any discrepancies.