Here is a link to the IRS withholding estimator, that you can use for your federal taxes. Just fill it out, it takes about 15 minutes, but you do you need all your tax information ready, such as pay stubs, etc:
https://www.irs.gov/individuals/tax-withholding-estimator
In addition, here is a link to TurboTax taxcaster, that you can also use for federal taxes:
https://turbotax.intuit.com/tax-tools/calculators/taxcaster/
Here is an Illinois tax calculator:
https://smartasset.com/taxes/illinois-tax-calculator
In addition, if you ended up owing in either federal or state, I would suggest using the amount you owed in the previous year. If you didn't really have any changes, and let's say for instance you owed $200 to federal last year, I suggest just dividing that $200 by 4 and making $50 quarterly payments.
If you have any further questions, feel free to contact TurboTax at 1-800-446-8848.
Thank you,
John
CPA
