What is the maximum amount of money a single person can make before they have to file taxes

[VolvoGirl]

If they are not a dependent on someone else’s return it’s 10,400.
https://ttlc.intuit.com/replies/3302274

[MichelleT]

 As a single person you need to file if you had at least $400 in net earnings from self-employment (income minus expenses)  or you had marketplace health insurance and received advanced payments for the premium tax credit.

You are required to file a tax return if your gross income was:

Under age 65 at least $10,350

Over age 65 at least $11,900

This IRS Interactive Tool may be helpful for you to decide if you should file a tax return.

https://www.irs.gov/uac/do-i-need-to-file-a-tax-return