Previous financial year earned salary deposited bank later years

I have filed income tax returns from 2006 to till date, money earned from salary. I have Deposited my previously earned salary cash 10,00,000 in 2014 in one bank. while Salary credited in 2014 in salary account. I paid tax only on my earned salary in 2014 & 2015 and not shown the cash deposit 10,00,000 in the returns in 2014 & 2015. Can I say that cash is from the previous years money and also paid taxes in respective years which is evident in ITR for last 10 years. Is there anything in my hand now. pl suggest. Thanks.