WHAT DOES TAX BREAKS MEAN?

[Marketstar]

A tax break means the government is offering you a reduction in your taxes.

See What Are Tax Breaks?

https://turbotax.intuit.com/tax-tools/tax-tips/Taxes-101/What-Are-Tax-Breaks-/INF15147.html

[macuser_22]

The $4,050 tax break for a child that you see is not a refund.   It is the child's exemption that reduces your taxable income by that amount, but not less than zero.  If your taxable income is already zero then it cannot lower it further and would not change your refund.