What if i do not disclose my previous organization salary in my current organization

Hi,

In july i changed my job. In my new company i provided the tax saving declaration (80c,80d) again and didn't provide the earned amount from april to july. Due to this tax is getting deducted only considering my current company's salary.

I am thinking to pay the due tax before filling the ITR next year when I'll get the form 16 from both employer. Will there be any penalty or interest if I pay my due tax while filling ITR next year in July.

Thanks,