In the US, income is income from dollar one even if you won’t actually end up paying tax on the income. The $600 that you’re referring to is just a reporting limit imposed on the company that made the payment – not the taxpayer.
The taxpayer is responsible for reporting all income. If you actually earned $599, and didn’t receive a form 1099, you’d still be responsible for reporting the $599 as income. If the $798 that you receive constituted income, you must report the entire amount.