How much can I claim for self-employment without being audited

[DoninGA]

There is no specific or range of income or expenses reported on a Schedule C that would trigger an IRS letter, notice or audit.
As with any item entered on a tax return you must always be able to prove the income, deduction or expense you report on a tax return is accurate and valid.

[TaxGuyBill]

The best way to GET audited is to claim an incorrect amount of income or expenses.

If you honestly report your income and expenses, (1) you will usually be less likely to be audited, and (2) if you are audited, it should be quick, easy, and you will likely not owe anything.

[Opus 17]

The goal is not to avoid audit, the goal is to provide accurate information from detailed accurate records so you can pass an audit.  You should always report your accurate honest income and expenses.