You need to tally the figures in Form 16 with the tax declaration statement provided by you to your organisation at the beginning of the year. It’s possible that the figures mentioned are either wrong, or not considered at all.
The result would be that fewer deductions would have been shown, resulting in higher tax liability. You might not have submitted the proofs of all investments, or could have forgotten to submit some bills.
If there is an error by the employer, you could request them to rectify it and issue a revised Form 16. If a higher tax has been deducted, you can claim a tax refund while filing your returns
