If you have your business books and records, they should show the amounts of your income transactions. While you do not have to send to the IRS, if you get examined you will have to show the records so you can prove the source and the dates received to match with the 1099-K records(which will show the monthly totals). It is possible that a 1099-K and the 1099-NEC show some or not all of the business income. The telltale flag for audit is if your business income is less than one or both of the forms!
From the IRS: (Understanding Your Form 1099-K | Internal Revenue Service)
It is important that your business books and records reflect your business income, including any amounts that may be reported on Form 1099-K. You must report on your income tax return all income you receive from your business. In most cases, your business income will be in the form of cash, checks, and debit/credit card payments. Business income is generally referred to as gross receipts on income tax returns. Therefore, you should consider the amounts shown on Form 1099-K, along with all other amounts received, when calculating gross receipts for your income tax return.
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