Estimated Taxes with New Job

[Mochina]

I assist my son in filing his taxes using Turbotax. For his 2023 returns, he was a full-time student who had additional income from a part-time job and a few financial accounts.  In the past,  because of investment income, he made estimated tax payments. But for 2023, he received refunds on his federal and state returns, primarily due to education credits. He is finishing graduate school soon and will start a full-time job during the last week in June. He is single with no dependents. We need help in determining what estimated taxes, if any, he should pay beginning in June. How would you recommend we go about determining this and making the necessary calculations?  Can we use Turbotax to help?  

[NCperson]

use the IRS withholding estimator

https://www.irs.gov/individuals/tax-withholding-estimator

alternatively, estimate his income using this website and it will indicate how much tax is due. 

https://www.dinkytown.net/java/1040-tax-calculator.html

[Opus 17]

You could use turbotax online, the program is "free to start" and you won't pay unless you need to actually file a return. Remember this is a 2023 tax program, although there are currently only minor changes expected for 2024.  

You can also use this site at the IRS.  

https://www.irs.gov/individuals/tax-withholding-estimator

However, the IRS estimator is going to work best if you wait until after he gets his first paycheck in July.  The estimator will take into account the wages, the job withholding, and any other income and credits, and will tell him if he is on track to owe or get a refund, and then you can either make an estimated payment or change his withholding to cover the taxes.