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What should I select for withholdings? Why do I owe so much?

🙋‍♂️ Withholdings – The Basics

When you work for a company, you receive a paycheck. Money is taken out of each paycheck(Tax withholdings) to cover income taxes, Social Security, and Medicare. It’s a “pay-as-you-go” method to prepay your income taxes so you don’t owe a big lump sum when you file. You calculate your withholding using the W-4 form.

The idea is to estimate your income, tax bracket, dependents, and other income sources to get a close estimate of what you will owe.

Withholdings is a common question & error, especially for married couples and/or high earners. There is no perfect solution. The goal should be to make it so that you owe nothing or close to zero at the end of the year in order to avoid ‘underpayment’ penalties.

🏬 Human Resource Departments

Before you start a new job, your human resource or payroll division will ask you to fill out a W-4. It is a standard set of questions designed to withhold the correct amount of taxes. These are based on the income tax brackets, filing status, & dependents. As your income goes up, the amount of taxes you owe goes up. Withholdings should go up in order to cover the increase in taxes. It seems simple, but there is a catch…

Human resource & payroll companies do not communicate with each other.

  • If you have multiple W-2s as one person…
  • If you are a married couple who both work…
  • If you switch jobs mid year…

Your HR departments at different jobs are not communicating with each other. They will only withhold as if each job is your only job.

When you combine the income together, it leads to a higher tax bracket, so you owe more to the government, but there was no increase in withholdings to cover. This can lead to large balances due. Every year, I have multiple clients unexpectedly owe over $20,000 simply based on withholdings errors.

📋 Filing out your W-4

Filling out your W-4 can be very confusing. One important thing to remember – The selections you make are designed for tax purposes only. They do not have to match what is on your tax return. You can select ‘Single’ even if you are married in order to have more withheld.

We cover each section in some detail below.

  • Filing (Marital) Status
  • Number of Jobs
  • Dependents
  • Other Income & Deductions
  • Extra Withholding

If you want the simplest solution, select ‘Single – 0’, even if you are married. This is the simplest way to get the highest amount taken out with the least effort.

🗳️ Filing (Marital) Status – Step 1

This is the first and most basic input. You check one of these boxes:

  • Single or Married Filing Separately
  • Married Filing Jointly or Qualifying Widow(er)
  • Head of Household

Each status determines your standard deduction and how much tax gets withheld from each paycheck based on the income tax bracket you will fall into.

Pro Tips:

  • Married Filing Jointly generally withholds less tax because your standard deduction and tax brackets are more favorable. If both spouses work, check the box in Step 2(c) to increase withholding and avoid underpayment.
  • Head Of Household – If you lose a dependent or trade with an ex each year, you need to update your status to Single when you have no dependent to claim.

#️⃣ Number Of Jobs – Step 2

If you or your spouse have more than one job, things get complicated…

  • If Jon(filing as Single) makes $50,000 in job #1 and switches mid year
  • And makes $50,000 in job #2…

Each job will withhold as if he is only in a 12% income tax bracket.

Every dollar after $50,400 is actually taxed at 22%, but each company is likely to only withhold at the 12% rate.

The IRS recommends you:

  • Check the box in Step 2(c) — this makes a rough adjustment for dual incomes (often more tax gets withheld to prevent underpayment).
  • Use the online IRS Tax Withholding Estimator,or
  • Use the worksheet on page 3 of the W-4.

👶 Dependents – Step 3

Dependents make a big change on your return. Each child under 17 is worth a $2,200 credit. That money is added back to your return, which is much more valuable than a deduction of the same amount.

In Step 3 of the W-4, you now enter:

  • $2,200 per qualifying child under age 17
  • $500 for other dependents

This directly reduces your total withholding because it reflects the Child Tax Credit.

💸 Other Income & Deductions – Step 4(a) & 4(b)

This is where things get even trickier. Withholdings from your paycheck only account for your W-2 wages.

Additional Income

If you earn additional money through stock sales, interest & dividends, self employment, or other investments, your W-2 withholdings will not likely be enough to cover.

You can enter your additional income in Step 4(a) if you want withholdings to account for all of your income.

Deductions

Withholdings assume that you are taking the standard deduction. If you will itemize your deductions because you have more than the standard (most common for folks with mortgage interest), this will reduce the amount of taxes you owe.

You can enter this amount in Step 4(b) to reduce withholdings.

➕ Extra Withholdings

This can be the simplest way to address additional taxes. Maybe…

  • You get a big bonus, or
  • Have stock option sales, or
  • You have side income, or
  • You under withheld in the prior year

You can use Step 4(c) to enter an additional amount to be withheld from each paycheck.

🆕 New for 2026 – Tips, Overtime & Senior Deductions

Recent tax law (the One Big Beautiful Bill Act) added a few new deductions, in effect through 2028, that can change your withholding math:

  • Tips – a deduction for qualified tip income, up to $25,000
  • Overtime – a deduction for the extra ‘half’ of time-and-a-half overtime pay, up to $12,500 (Single) or $25,000 (Married Filing Jointly)
  • Seniors (65+) – an extra $6,000 deduction per person

(These phase out at higher incomes – starting around $150,000 Single / $300,000 Married for the tips and overtime deductions.)

Here’s why it matters for withholding: your employer still withholds tax on your full paycheck – tips and overtime included. But if part of that pay is now deductible, you can end up over-withheld, meaning a bigger refund or room to take home a bit more each check. If a large share of your income comes from tips or overtime, you can reflect that deduction in Step 4(b) so less is withheld. More on deductions here – How Do I Increase My Deductions?

🧭 How Should I Actually Fill Out My W-4?

Most W-4s only really need Step 1 (your status) and Step 5 (your signature). The rest only matters in specific situations – here’s the quick version by scenario:

  • Single, one job: Check ‘Single’ in Step 1, sign Step 5, done. The default withholding is built for exactly this.
  • Married, only one spouse works: Choose ‘Married Filing Jointly’ in Step 1 and sign. One income on MFJ withholds accurately on its own.
  • Married and both work (the #1 cause of surprise balances): If your incomes are similar, check the box in Step 2(c) on BOTH W-4s. If they’re very different, use the IRS Tax Withholding Estimator for exact numbers. Either way, claim your dependents (Step 3) on only ONE spouse’s W-4 – never both.
  • One person, two jobs: Check Step 2(c) on your highest-paying job’s W-4 (leave it off the others), or run the IRS estimator.
  • You’d rather get a refund than ever owe: Select ‘Single’ even if you’re married, and/or add a flat dollar amount in Step 4(c) – the simplest way to over-withhold on purpose.
  • You have side income, investments, or self-employment: Your W-2 withholding won’t cover it. Add the extra expected tax in Step 4(c), or make quarterly estimated payments.

Pro Tip – Redo your W-4 after any big life change: marriage or divorce, a new baby, buying a home, a large raise, or a spouse starting or stopping work. And do a quick ‘paycheck checkup’ with the IRS estimator around mid-year, while you still have enough paychecks left to fix course before December.

🤔 Parting Thoughts

As always, thanks so much for reading! If you enjoy reading, please share these articles with anyone (subscribe here) that you feel might benefit.

If you have any additional questions, please reach out. We help individuals and businesses year-round with personal and business tax services.

Thanks,

– Taxman

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