QUOTE(YuAndDan @ May 24 2007, 05:56 PM)

The consular officer can and may ask for IRS records, you may want to attach a letter explaining why you were exempt from filing a return last year. Other evidence that you will want to attach are letter from employer, and recent pay stubs going back 6 months to show that you are making money.
If you worked in 04 or 05, I would include those tax returns or transcripts along with an explanation that you had not income in 2006, so were officially exempt from filing a return. If you had any income at all, you are required to file a return regardless of whether you would owe any taxes. If you had any income, you can still file a return now. There is not penalty for filing late when you don't owe anything. You might also want to provide a brief explanation of how your supported yourself in 2006.
You can annualize your current income for that space on either the I-134 or I-864. A standard Employer letter (see the guides) and as recent a pay stub as you can reasonably get to your spouse will be sufficient if it shows year to date income.
I've never understood the recommendation of providing more than one pay stub unless it wouldn't show year to date income.