Create a new account by registering with your PAN, provide your income details (you need not provide proof); just declare your income. The declaration form contains an option to declare income received as cash also. You can use that, submit your declaration and pay any appropriate tax for your income band. The income tax department will assess it and will provide you with receipt which will state that you've paid X amount of tax. Based on this tax, one can compute your approximate income.
You can use this receipt from the income tax department as your proof of income, and the same can be submitted to your next prospective employer.
However, if you don't pay tax, you will be in soup over the long run.
You can use a private website like http://cleartax.in[^] who will make it easier for you to file your returns. They will also provide service to you if required.
However, the easiest thing is to find an auditor near your home or office, and seek their help to file your returns. They will file your income on your behalf for around Rs.100 to Rs.150 per financial year. Since you've to file for 4 years together now, you may ask for a discount.
1. A very important thing for you to do is to ask for pay slips on your company letter head. Even if it states the amount was paid to you by cash, that's OK. But I suggest that you take pay slips from your company.
2. After you receive your next salary (by cash), deposit the whole thing into one of your bank accounts and then withdraw from the account for your expenses. This will at least create some sort of a 'deposit record' over a period of time. This bank statement can also be a reasonably strong proof of your income in case you don't have salary slips (or lose them later). Bank statements can be obtained any time, for any time interval.
Dhoni - today wearing Jersey No. 7,
playing at 7th position, finishes 7000 ODI runs and
becomes a 7th indian batsman to do so.
(And also making 100 runs partnership for 7th wicket).
What 7nastic day for him."