One 1099 form shows I was paid an amount very late in the year, but I did not receive or deposit the payment until the next year. How do I make this adjustment in my form?
Yes, if your business runs on a cash-basis, you should report only the business income you actually received during the tax year.
Since only the total for income reported on Form 1099-MISC appears on Schedule C, you may adjust the amount you enter for a 1099-MISC that includes income you received after the end of the year.