Thank you for asking! If you want to withhold more in federal income tax, you will want to claim fewer exemptions from withholding (in your scenario, 0 will withhold more than 1).
If you would like to see how much will be withheld, I recommend using our W-4 Calculator, which you can access at https://turbotax.intuit.com/tax-tools/calculators/w4/.
You might also use Taxcaster, our tool for estimating federal income tax, at https://turbotax.intuit.com/tax-tools/calculators/taxcaster/, so you can compare what you may owe with what you are withholding.
Using those tools together can help you withhold the right amount and avoid owing at tax time.
