How much income on a 1099 form before you have to report?

If you're getting a 1099, it's been reported to the IRS, so you should report it no matter how much it is to avoid being charged with tax fraud.

I think, though I may be wrong, that business are not required to file 1099 forms for payees with annual amounts under $600. (This doesn't mean they CAN'T, just that they don't HAVE to). You should consult a tax attorney for definitive advice.

You have it right....but the $600 limit applies to only certain types of payments.

Bascially those made as part of a standard business tranaction. Any over that must get a form.

Transactions like interest paid, dividends received, etc...all require 1099s