How to Fill Out the W-4 Form: A Clear Guide from AAG Tax & Accounting LLC

Why the W-4 Form Matters

When you begin a new job or experience a life change (marriage, new child, side income, etc.), the W-4 form must be completed so your employer knows how much federal income tax to withhold from your pay. While the old system used allowances, the modern form focuses on dependents, multiple jobs, itemized deductions, and withholding adjustments — making proper completion important for avoiding surprises at tax time.

What We’ll Cover:

• What the W-4 form is and when you must submit it

• How to complete each section (Step 1 through Step 5)

• When you should submit a new W-4 form

• How you can adjust your withholding to better match your tax liability

• Tips for Connecticut employees and those with multiple jobs or freelance income

1. What is the W-4 Form?

The W-4 (Employee’s Withholding Certificate) is the form you give your employer to determine how much federal income tax should be withheld from your wages.

Since the 2020 version, the form no longer uses the number of “allowances” but instead focuses on filing status, income from multiple jobs, dependents, additional income, deductions, and adjust-withholding lines.

2. Downloading & Filing the W-4

You can obtain the latest W-4 from the Internal Revenue Service (IRS) website or from your employer’s payroll department.

When you start a new job, your employer will ask you to complete it — you don’t typically need to fill one out every year unless your situation changes.

3. How to Complete the W-4 (Step-by-Step)

Here’s how to walk through the form:

Step 1: Enter Personal Information
Record your full name, address, Social Security number, and tax filing status (single, married filing jointly, head of household). This sets the base for your withholding.

Step 2: Multiple Jobs or Spouse Works
If you have more than one job, or you and your spouse both work, this step helps you account for combined income so that withholding more closely matches your actual tax liability. Options include:

• Using the IRS Withholding Estimator with all combined income.

• Or using the “Multiple Jobs Worksheet” on page 3 of the W-4.

• Or if there are two jobs and incomes are similar, checking a box to simplify.
  If you fill out Step 2, normally only the highest-paying job’s W-4 should continue to Steps 3 & 4.

Step 3: Claim Dependents
If your adjusted gross income is at or below certain thresholds (for example $200,000 or $400,000 for married filing jointly), you may enter the number of qualifying children or dependents to claim associated tax-credits.

You may choose not to claim dependents here (even if you have them) if you prefer more tax withheld and lower risk of owing at year-end.

Step 4 (Optional): Other Adjustments

• Line 4(a): Enter other income you expect that is not subject to withholding (interest, dividends, freelance income).

• Line 4(b): Enter if you plan to itemize deductions (instead of the standard deduction) and want withholding adjusted accordingly.

• Line 4(c): Enter any extra amount you want withheld each pay period. Useful if you expect owing tax or want to increase your refund.

Step 5: Sign and Date the Form
Once complete, sign and date the form and return it to your employer or payroll department. Some employers allow electronic submission.

4. When and Why to Update Your W-4

You don’t have to submit a new W-4 annually, but it’s wise to review it whenever your life or income changes — such as:

• Getting married or divorced

• Adding or losing a dependent

• Starting or ending a second job or side gig

• Receiving a large bonus, rental income, investment gains

• Having a big change in itemized deductions

If you received a large refund last year, you might be over-withholding (i.e., giving the government an interest-free loan). If you owed a lot, you might want to increase withholding or make estimated payments.

5. Withholding Strategies: Owe Less or Get More Cash Now?

If you want more tax taken out

• Enter fewer dependents or don’t claim any in Step 3

• Add a specific extra amount on Line 4(c)

• Avoid ignoring multiple-job income in Step 2

If you want less tax withheld (and more take-home pay)

• Claim eligible dependents Step 3

• Make sure to account for all income sources

• Use Step 4 to carefully reduce withholding but be aware of risk of owing tax.

Targeting a zero tax balance due at filing
If your goal is to have neither a large refund nor a large tax bill:

• Use accurate projections of all income (including side income, capital gains, rentals)

• If you will itemize, use line 4(b) to account for that

• Use line 4(c) to add extra withholding if needed.

6. Connecticut & Local Considerations

For clients in Connecticut and the New England region:

• While the W-4 covers federal withholding, don’t forget state withholding requirements. Some states require their own form or additional information (Connecticut uses CT withholding form if applicable).

• If you’re a freelancer or have multiple income streams common in New England’s gig economy, be sure to either adjust withholding accordingly or make quarterly estimated payments to avoid year-end surprises.

• At AAG Tax & Accounting LLC, we help review both federal W-4 withholding and state withholding (for CT and other states) to optimize your payroll tax outcome.

7. Action Checklist for You

• Review your current W-4 upon major life changes.

• If you have multiple jobs or a spouse who works, consider whether Step 2 needs adjustment.

• Estimate any non-wage income (interest, dividends, freelance) and use Step 4(a) if needed.

• Decide if you’ll itemize deductions and use Step 4(b) accordingly.

• Determine if you want a smaller refund (more take-home pay) or safer withholding (less chance of owing) and adjust line 4(c).

• Submit the updated W-4 to your employer promptly. Don’t delay waiting until tax season.

• Keep a copy for your records and review annually or when circumstances change.

Final Thoughts

Completing and updating your W-4 isn’t just an HR formality—it’s a key tool for managing your cash flow, avoiding tax season surprises, and staying in control of your tax-withholding destiny. With the right approach and timely updates, you’ll pay what you owe and keep more of your money working for you.

Need help reviewing your current W-4 or payroll withholding strategy? Contact AAG Tax & Accounting LLC — we’re here to help.

This content is intended for general informational purposes only and does not constitute personalized tax advice. Always consult with a qualified tax professional for guidance specific to your situation.