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If you are owing money, the government(s) does not care if it comes from one source of income or multiple so sometimes you can just pick one source and have all the money come from that one source.  For example, if you have multiple employers or retirement accounts, pick only the ones you want withholdings to come out of for federal and state. (some states do not have income taxes so disregard if you are in one of those states) Then look at these links to learn what a W4 looks like and how to fill one out. How to fill out a W4  Instructions on how to fill out a W4 W4 calculator  Use to help fill out a W4 Form W4  Actual W4.  Line 4c is where you would add extra withholdings from each check.   Once you have filled out the W-4, then in a few months use the links below to do a tax estimator.  This will tell you how much you might owe after making the changes.  You can do a tax estimator several times per year.  If you have changed your withholdings mid year, you will want to see that you keep owing less as the year goes on.   IRS Tax estimator This is a tax estimator that will time out so enter and print findings all at one sitting. TaxCaster  This is another tax estimator that will time out so enter and print findings all at one sitting.   For state withholdings, it is hard to find a tax estimator for each state but they will have a state withholdings form that you can fill out.     Now the short answer, I also like to sometimes just stay with what is already on your W4 and just figure out what might be owed extra and then divide that by how many pay periods you have in a year and put that number on 4c.  Let's say you owe $1000 next year after changing your W4s.  Then take $1000/ (number of pay periods in the year) and put that amount on 4c.  Ex.  1000/52 (paid every week)=19.2 or rounded up to $20 per pay period.     I would then do some tax estimators (see links above) later in the year and see if your extra withholdings are helping!    I hope you find this information useful.     Katie S  

No, you typically do not include either of your dependents income on your return (there is an investment income exception discussed in the link below).   They may have a filing requirement on their own if either earned more than $14,600 or had more than $1,300 of investment income in 2024.  Tax Filing Requirements for Children If each one earned less than the $14,600, you may still want to file if state or Federal taxes were withheld and you want to claim the refund.

Marking the multiple jobs box on the W-4 for your lower-paying job instead of your higher paying-job can underestimate your total tax liability, resulting in too little tax withheld throughout the year- which could lead to: 1-Owing taxes when you file your return 2-Potential underpayment penalties and interest 3- Smaller paycheck adjustment now and larger tax bill later.   The form assumes the job where you checked the box is higher paying one and calculate the extra withholding accordingly. The IRS assumes you are earning more from that job than you actually are and your other job is less significant, so the higher paying job withholds at a lower rate and the lower job doesn't withhold enough either.  

Once the Spring semester is complete and you then get Fall work assigned, the best practice would be to project your total income for the year.  You can see the total Federal taxes withheld for Spring and then adjust based on what you expect total year taxes to be.  If your employer is under withholding based on certain assumptions during the Spring, you can go online in December and make an estimated tax payment (make sure it is being apllied to the correct year).

You do not include your dependent child's wages on your tax return. A dependent child who has earned more than $14,600 of earned income (tax year 2024) typically needs to file a personal income tax form. Earned income includes wages, tips, salaries, and payment from self-employment. A dependent child who receives more than $1,300 in investment income in 2024 is required to file a tax return. Investment income includes interest and dividend payments. Here is the link on tax filing requirements for children:  Tax filing requirements for children 

Irregular income can be a real challenge to manage, as it is often classified as "supplemental income." Supplemental income is not taxed according to your W-4 form instructions, rather, it is taxed at the supplemental rate (typically 22% federally), often leaving you under withheld.  This article explains more. A few ways to deal with that is to first determine what tax bracket you are in. While this calculator is for 2024, it can help you figure it out. You can also look at your TurboTax return to see your marginal rate.  While that will be the ending marginal rate (interim income could be lower), it can also help. If your marginal rate (tax bracket) is above 22%, you can ask your payroll department to withhold at a higher rate, or, if you prefer, you can figure out the difference and send it right to the IRS as an "estimated payment." Here's how you do that. One thing to be aware of, is that changes you make now will only cover income for the remainder of the year. Consider if you need to do a "catch up" estimated tax payment. Hope this helps. **Please cheer or say thanks by clicking the thumb icon in a post **Mark the post that answers your question by clicking on "Mark as Best Answer" Regards, Karen TurboTax Expert  

Thank you for the follow up answer.  With three jobs you will fill out Line 2 using the tables on page 4 of the link I sent.  It will involve the annual wages of all three jobs.   You will take the annual wages from the highest to the lowest and have to add at the lowest two together in two places.   Step Three is where you need to adjust the pay periods from the highest paying job for the remainder of the year.     The worksheet is not too hard once you know what the annual wages are.     Thank you for the follow up question @chanchez1025    All the best,   Marc T. TurboTax Live Tax Expert JD, MTax 28 Years of Experience Helping Clients    

@AZ-Wildcat-22 wrote: Do I enter in my dependents (under 18) salary as an income source?  Is there a specific amount that they have to make to be included as an income source?   Same question for a child 18+? No, you do not enter a dependent's salary as an income source.  Nor the salary of a non-dependent that resides in your household.

Intuit TurboTax has several free calculators that will allow you to try different changes to see how they will impact your return for Tax Year 2025.  We are early enough in the year that you could make changes that will help you owe less in tax so you can break even when filing your tax return for 2025.     You can use the tax calculator to adjust or make changes for example if you increase retirement savings how would that impact the taxes owed.  Once you review the changes and are happy, you can use the W-4 calculator to make adjustments in your withholding to have more or less taken out of your paycheck.   Tax Calculator 2024 W-4 Calculator 2024   I would also suggest keeping an eye on the potential changes currently being reviewed in Congress.  If the bill passes, it will increase the SALT (State & Local Tax) cap.  As you indicated you live in NY this may have a positive impact for you by increasing itemized deductions.

You should send in quarterly estimated payments for other income like interest.   If  you have a lot of other income or a big tax due then Turbo Tax should print out estimates for you to use (they are optional).   If you want to make estimated pre payments for next year go to..... Federal Taxes or Personal (Home&Business version) Other Tax Situations Other Tax Forms Form W-4 and Estimated Taxes - Click the Start or Update button Say No to W4. When you get to the W4 and Estimated Taxes section, say you want to adjust your income to go though all the screens.   You can even owe the penalty if you are getting a refund for not paying in evenly during the year.   So pay the estimates and don't wait until you file to pay.   If you get a penalty on 1040 line 38, you might be able to eliminate it or at least reduce it. You can go to Federal Taxes tab or Personal tab, under Other Tax Situations and select Start by the Underpayment Penalties. You will answer a series of questions that may reduce or eliminate the penalty. Or you can elect to have the IRS figure the penalty for you. It's form 2210. How to add form 2210 for Underpayment Penalty https://ttlc.intuit.com/community/tax-payments/help/how-do-i-add-form-2210/00/25703   It's under Federal tab or Personal (for Home & Business Desktop) Other Tax Situations Additional Tax Payments Underpayment Penalties - Click the Start or update button

Your withholdings may be understated now.  You can recalculate and fill out new W-4s for the year.  The IRS Tax Withholding Estimator will take into account your year to date withholdings.  Remember to prorate your Line 4(c) additional withholding for your remaining pay periods.

Completion of the the W-4   Employee Withholding Certificate consists of five steps.   In Step 1 (c) of the W-4, you would check Head of Household if you are unmarried and pay more than half the cost of keeping up the home for yourself and your children.   If you have more than one job, you should complete Step 2.   In Step 3, you multiply your number of qualifying children under the age of 17 by $2,000 and enter the result.   And if you have Other income not from jobs; expect to claim itemized deductions instead of standard deduction; or want extra withholding you would complete Step 4.   Step 5 you sign the form.   If you just have the one job and dependents, you would only need to complete Steps 1, 3 and 5; and the withholding should be consistent with your annual tax liability.   If you have more than one job, or additional income for which there is not withholding, you may want to use the IRS Withholding Estimator to assist you in determining your withholding.