How Much is Tax on $45K Salary?

If you are filing as head of household with one child, with a W-2 for $45,000, and have no other income or deductions, your federal balance due would be approximately $900.

Child tax credit, offsets income tax liability and produces this tax result.

Any federal and state withholding listed on W-2 boxes 2 and 17, respectively, would increase your tax refund by those amounts.

Depending on your state, the state refund will differ.