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Illinois Department of Revenue

Form IL-W-4

Employee’s Illinois Withholding Allowance

Certificate and Instructions

Who must complete Form IL-W-4?

also will receive additional allowances if

next calendar quarter (that is, January 1,

you or your spouse are age 65 or older, or

April 1, July 1, or October 1) that falls at

If you are an employee, you must com-

if you or your spouse are legally blind.

least 30 days after the date you file the

plete this form so your employer can with-

change with your employer.

hold the correct amount of Illinois Income

How do I figure the correct

Tax from your pay. The amount withheld

Example: If you have a baby and file a

number of allowances?

from your pay depends, in part, on the

new Form IL-W-4 with your employer to

number of allowances you claim on this

claim an additional exemption for the baby,

Complete the worksheet on the back of

form.

your employer may immediately change

this page to figure the correct number

the withholding for all future payments of

of allowances you are entitled to claim.

Even if you claimed exemption from

compensation. However, if you file the new

Give your completed Form IL-W-4 to your

withholding on your federal Form W-4,

form on September 1, your employer does

employer. Keep the worksheet for your

U.S. Employee’s Withholding Allowance

not have to change your withholding until

records.

Certificate, because you do not expect

the first payment of compensation is made

to owe any federal income tax, you may

If you are a partner in a same-sex civil

be required to have Illinois Income Tax

to you after October 1. If you file the new

union, and are subject to federal income

form on September 2, your employer does

withheld from your pay (see Publication

tax on health benefits your employer

not have to change your withholding until

130, Who is Required to Withhold Illinois

pays for your partner, these benefits are

Income Tax). If you are claiming exempt

the first payment of compensation made to

not taxed by Illinois. Your employer will

you after December 31.

status from Illinois withholding, you must

still withhold Illinois tax on these benefits

check the exempt status box on Form

unless you choose to claim additional

How long is Form IL-W-4 valid?

IL-W-4 and sign and date the certificate.

allowances to reduce your withholding

Do not complete Lines 1 through 3.

Your Form IL-W-4 remains valid until a

by including the amount of these benefits

new form you have filed takes effect or

on Line 6 of the Withholding Allowance

If you are a resident of Iowa, Kentucky,

until your employer is required by the

Worksheet.

Michigan, or Wisconsin, or a military

department to disregard it. Your employer

spouse, see Form W-5-NR, Employees

If you have more than one job or

is required to disregard your Form IL-W-4

Statement of Nonresidence in Illinois, to

your spouse works, you should figure the

if you claim total exemption from Illinois

determine if you are exempt.

total number of allowances you are en-

Income Tax withholding, but you have not

titled to claim. Your withholding usually will

If you do not file a completed Form

filed a federal Form W-4 claiming total

be more accurate if you claim all of your

IL-W-4 with your employer, if you fail to

exemption. Also, if the Internal Revenue

allowances on the Form IL-W-4 for the

sign the form or to include all necessary

Service (IRS) has instructed your em-

highest-paying job and claim zero on all of

information, or if you alter the form, your

ployer to disregard your federal Form W-4,

employer must withhold Illinois Income Tax

your other IL-W-4 forms.

your employer must also disregard your

on the entire amount of your compensa-

Form IL-W-4. Finally, if you claim 15 or

What if I underpay my tax?

tion, without allowing any exemptions.

more exemptions on your Form IL-W-4

If the amount withheld from your com-

without claiming at least the same number

When must I file?

pensation is not enough to cover your

of exemptions on your federal Form W-4,

tax liability for the year, (e.g., you have

You must file Form IL-W-4 when Illinois

and your employer is not required to refer

Income Tax is required to be withheld from

non-wage income, such as interest or

your federal Form W-4 to the IRS for re-

dividends), you may reduce the number of

compensation that you receive as an em-

view, your employer must refer your Form

allowances or request that your employer

ployee. You should complete this form and

IL-W-4 to the department for review. In that

withhold an additional amount from your

give it to your employer on or before the

case, your Form IL-W-4 will be effective

pay. Otherwise, you may owe additional

date you start working for your employer.

unless and until the department notifies

tax at the end of the year. If you do not

You may file a new Form IL-W-4 any time

your employer to disregard it.

have enough tax withheld from your pay,

your withholding allowances increase. If

and you owe more than $500 tax at the

the number of your previously claimed al-

What is an “exemption”?

end of the year, you may owe a late-pay-

lowances decreases, you must file a new

An “exemption” is a dollar amount on

ment penalty. You should either increase

Form IL-W-4 within 10 days. However, the

which you do not have to pay Illinois

the amount you have withheld from your

death of a spouse or a dependent does

Income Tax. Therefore, your employer will

pay, or you must make estimated tax pay-

not affect your withholding allowances until

withhold Illinois Income Tax based on your

ments.

the next tax year.

compensation minus the exemptions to

For additional information on penalties,

which you are entitled.

When does my Form IL-W-4

see Publication 103, Uniform Penal-

take effect?

ties and Interest. Visit our website at

What is an “allowance”?

tax.illinois.gov to obtain a copy.

If you do not already have a Form IL-W-4

The dollar amount that is exempt from

on file with your employer, this form will be

Illinois Income Tax is based on the number

Where do I get help?

effective for the first payment of compen-

of allowances you claim on this form. As

• Visit our website at tax.illinois.gov

sation made to you after this form is filed.

an employee, you receive one allowance

• Call our Taxpayer Assistance Division

If you already have a Form IL-W-4 on file

unless you are claimed as a dependent on

at 1 800 732-8866 or 217 782-3336

with this employer, your employer may

another person’s tax return (e.g., your par-

• Call our TDD (telecommunications

allow any change you file on this form to

ents claim you as a dependent on their tax

device for the deaf) at 1 800 544-5304

become effective immediately, but is not

return). If you are married, you may claim

• Write to

required by law to change your withhold-

additional allowances for your spouse and

ILLINOIS DEPARTMENT OF REVENUE

ing until the first payment of compensation

any dependents that you are entitled to

PO BOX 19044

is made to you after the first day of the

claim for federal income tax purposes. You

SPRINGFIELD IL 62794-9044

IL-W-4 (R-12/12)

Form Il-W-4 - Employee'S Illinois Withholding Allowance Certificate And Instructions

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