EIC Credit

If you earned $600 with 3 Qualifying children, you would be eligible for an Earned Income Credit of $281 according to the EIC Table.

Line 27a of your 1040 will show the amount you received for your Earned Income Credit.  

You can see the amount using TurboTax online by clicking the following:

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Do you have any other type of income that supports all of you?

It appears that after putting in that I am Head Of Household and have 3 dependents and only made $600.

Something just doesn't seem right here.  It's as if quite a lot of pertinent information has been held back. There is no way possible that you can support yourself and maintain a household (for HOH status) on $600 for an entire year. Much less, support 3 dependents.

Based solely on the information provided, I would expect that someone else  supported you and your dependents for the entire 2021 tax year. Depending on the specifics of such a situation, whoever  supported you may qualify to claim you and possibly your 3 dependents, as their own dependents. So if you are being claimed as a dependent on another return, then you yourself can't claim any dependents.

So what's missing here? Again, based solely on the information provided thus far, I can't see any possible way to support one's self, three dependents and maintain a household with this $600 in an entire year. Maybe you have other sources of income you're not mentioning here? An example would be a large cash inheritance, which may not be reportable on your tax return.