Hi,
Actual proof of Income is pay slip, which include FORM 16 provided to employee by employer. Pay Slip, solo is not strong evidence of proof of Income. Appointment letter is never proof of Income.
Bank statement, indicating credit of salary in your account is considered as an evidence of Income, under Indian Evidence Act. But still I would suggest, form 16 is far better , only strong evidence of Income.
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THIS IS IF YOU HAVE OTHER SOURCE OF INCOME APART FROM SALARY:
CASE 1
If apart from service you have other source of Income, then under Income Tax Act,1961 clubbing of income is mandate(To get taxable Income). Then if you file income tax separately under self assessment scheme or filed by a CA/CS/CWA on your behalf, what I mean to say your employer does to perform Tax deduction at source, then such form provided by Income Tax Authority, ratified by seal of CA/CS/CWA can be considered as your Source of Income.
CASE 2:
Your employer goes of Tax Deduction at source, then form 16 is best proof of Income. Now, if you file return of Income Tax, for Tax deducted by employer & to avoid 'DOUBLE TAXATION', then such form of return, along with Tax filing documents should be considered as Income Certificate. Procedure will be close to case 1.
Eg of other sources of Income:
1. Income under the head, House Rent or property rent.
2. Income from Business or profession.
3. Income from other sources.
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Hope your problem is solved.
Thanks & Regards
Sovik B