Do I have to submit all receipts for expenses I claimed on 1040 Schedule C? If the answer is yes, should I enclose them, along with 1040 Schedule C and 1040NR, in my tax envelope?

Thank you. I am going to continue checking my shoebox of receipts...

Another question:

How about those purchases that do not come with receipts, like the online purchases? These online purchases appear on my electronic bank statement. Should I print out my bank statement for every month and submit them with the 1040 Schedule C and 2040NR?

Thanks.

Alen72035:

Submit no receipts or bank statement with your tax return. However, keep them together with your file copy of the tax return in the event (which is rather small) that the IRS will audit you and ask you to prove your expenses.

As long as your expenses are legitimate and not excessive, the IRS will probably not challenge the validity of your return.