Indiana Tax Form IT-40X - Amended Individual Income Tax Return Instructions
General Instructions
Who should file Form IT-40X
This form should be filed by all individuals needing to correct an original Indiana individual income tax return. Note: You may not change your filing status (from a joint to a single return) after the due date of the original tax return has passed.
Additional Information
If you have any questions concerning the types of income included in the total income, what adjustments are allowable to total income, how to compute and claim various credits, etc., you should refer to the instructions for the individual income tax return for the year you are amending.
Enclosures
You must provide a complete explanation of the changes to your previously filed return. Also, enclose a copy of your amended federal return, if one was filed, and any schedules and forms that support the changes listed in Column B.
If you are claiming a net operating loss deduction, you must enclose Schedule IT-40NOL. You must also enclose copies of the federal return and schedules for the loss year. Failure to submit a complete explanation and the appropriate state and federal schedules and forms could result in a delay in processing your claim.
Column A - Enter the amount shown on your original return or previously amended return, or as last determined by the Department.
Column B - Enter the amount of change in the items reported on your original return.
Column C - Enter the correct amounts after taking into account the increases or decreases shown in Column B. If there are no changes, enter the same amount in Column A and Column C, leaving Column B blank.
Line 1 - Indiana Adjusted Income
Enter the amount of Indiana adjusted income on line 1. Indiana adjusted income is equal to your federal adjusted gross income as modified by Indiana adjustments and deductions allowed on the Indiana individual income tax return. All changes reported on this line must be explained and proper verification supplied.
Line 4 - State Adjusted Income Tax
Multiply the amount on line 3 by the applicable rate.
| Tax Years* | Rate |
| 1988 - Present | 3.4% (.034) |
| * Contact the Department for the appropriate rates if filing for years before 1988. | |
Indiana County 2-Digit Code Number Chart
Use the chart below to find the 2-digit county code number to fill in at the top of Form IT-40X. You will need to find the code number for the county(s) where you lived and worked on January 1. If you worked at home or were retired on January 1, enter the county number where you lived in both boxes. Important: If you worked outside Indiana on January 1, enter code 00 unless you worked in any of the following states: Illinois, Kentucky, Michigan, Ohio, Pennsylvania or Wisconsin. See the 2-digit code numbers for those states in the box following Whitley County below.
| # .... County Name | # .... County Name | # .... County Name |
| 01......Adams 02......Allen 03......Bartholomew 04......Benton 05......Blackford 06......Boone 07......Brown 08......Carroll 09......Cass 10......Clark 11.......Clay 12......Clinton 13......Crawford 14......Daviess 15......Dearborn 16......Decatur 17......DeKalb 18......Delaware 19......Dubois 20......Elkhart 21......Fayette 22......Floyd 23......Fountain 24......Franklin 25......Fulton 26......Gibson 27......Grant 28......Greene 29......Hamilton 30......Hancock 31......Harrison 32......Hendricks 33......Henry 34......Howard 35......Huntington |
36......Jackson 37......Jasper 38......Jay 39......Jefferson 40......Jennings 41......Johnson 42......Knox 43......Kosciusko 44......LaGrange 45......Lake 46......LaPorte 47......Lawrence 48......Madison 49......Marion 50......Marshall 51......Martin 52......Miami 53......Monroe 54......Montgomery 55......Morgan 56......Newton 57......Noble 58......Ohio 59......Orange 60......Owen 61......Parke 62......Perry 63......Pike 64......Porter 65......Posey 66......Pulaski 67......Putnam 68......Randolph 69......Ripley 70......Rush |
71......St. Joseph 72......Scott 73......Shelby 74......Spencer 75......Starke 76......Steuben 77......Sullivan 78......Switzerland 79......Tippecanoe 80......Tipton 81......Union 82......Vanderburgh 83......Vermillion 84......Vigo 85......Wabash 86......Warren 87......Warrick 88......Washington 89......Wayne 90......Wells 91......White 92......Whitley 94......Illinois 95......Kentucky 96......Michigan 97......Ohio 98......Pennsylvania 99......Wisconsin 00......Out-of-State code |
Line 10 - Estimated Tax Installment Carryover
This line cannot be changed unless the amended return is filed by the installment payment due date.
Line 11 - Penalty for the Underpayment of Estimated Tax
This penalty is based on the tax that was due by your original filing due date. Any increase or decrease in tax due will change the penalty amount, unless the change is due to a net operating loss carry back deduction. Attach Schedule IT-2210 to support any changes.
Line 17 - Amount Paid on Original Return
Enter the amount of previous payments for individual income tax paid on the original return.
Line 19 - Amount Previously Refunded or Requested
Enter the total of all previous refunds you have received or requested for the year in question. You must include the actual refund received or calculated before any contribution to the Indiana Nongame Wildlife fund. This amount should be subtracted from your total credits (line 18) to arrive at your net credits (line 20).
Line 21 - Refund
Enter the amount of refund you are claiming. The processing of amended tax returns takes approximately 20 weeks. A claim for refund of withholding credits must be made within two years of the due date of the original return (including extensions). A claim for refund of all other payments and refundable credits must be made within three years from the due date of the original return (including extensions) or the date of overpayment, whichever is later.
Due Date
The due date for filing your Indiana individual income tax return is the 15th day of the fourth month following the close of the tax year. If the due date falls on a weekend or national legal holiday or statewide holiday, the due date will fall on the next business day.
Lines 23 and 24 - Penalty and Interest
If this amended return is submitted after the due date for filing your original return, you must include penalty and interest from the due date. The penalty is 10% of the remittance due or $5.00, whichever is greater. Find your interest rate from the chart below:
Tax Years |
Annual Rate |
Monthly Rate |
1996 -2000 |
7% (.07) |
.0058 |
2001 -2002 |
8% (.08) |
.0067 |
2003 |
6% (.06) |
.005 |
2004 |
4% (.04) |
.0033 |
2005 |
3% (.03) |
.0025 |
2006 |
4% (.04) |
.0033 |
2007 |
5% (.05) |
.0042 |
2008 - 2009 |
7% (.07) |
.0058 |
If filing for years other than those listed above, contact the Department at (317) 232-2240 or visit our web site at www.in.gov/dor/3618.htm to get Departmental Notice # 3.
Line 25 - Amount You Owe Payment Options
There are several ways to pay the amount you owe.
Make your check, money order or cashiers check payable to: Indiana Department of Revenue.
You may also pay using the eCheck payment method. This service uses a paperless check and may be used to pay the tax due with your Indiana individual income tax return, as well as any billings issued by the Indiana Department of Revenue for any tax type. Go to www.in.gov/dor/epay and follow the step-by-step instructions to make your payment. You will receive a confirmation number and should keep this with your tax filing records. The fee for using this service is $1.
Important: All payments made to the Indiana Department of Revenue must be made with U.S. funds.
You may also pay by using your American Express® Card, Discover®Card, MasterCard® or VISA® by calling 1-800-2-PAY TAX (1-800-272-9829). Or, log on to www.in.gov/dor/epay and use your Discover® Card, MasterCard® or VISA® to make a payment.
A convenience fee will be charged by the credit card processor based on the amount you are paying. You will be told what the fee is and you will have the option to either cancel or continue the credit card transaction.
Note: No payment is due if you owe less than $1.
Lake County 4-digit code numbers
Use this chart to find your 4-digit number to fill in on the back of the IT-40X if you and/or your spouse (if filing jointly) lived or worked in Lake County, Indiana on Jan 1, 2008.
Note: If you (and/or your spouse if married filing jointly) lived and worked in different locations in Lake County on Jan. 1, 2008, enter the 4-digit number for the location where you lived.
Lake County Cities and Towns Chart
4504 |
Cedar Lake |
4529 |
Lowell |
4506 |
Crown Point |
4530 |
Merrillville |
4511 |
Dyer |
4531 |
Munster |
4512 |
East Chicago |
4532 |
New Chicago |
4513 |
Gary |
4540 |
Schererville |
4515 |
Griffith |
4541 |
Schneider |
4516 |
Hammond |
4546 |
St. John |
4518 |
Highland |
4549 |
Whiting |
4519 |
Hobart |
4550 |
Winfield |
4524 |
Lake Station |
4599 |
Other Lake County Community |
Mailing Address
Mail your completed Form IT-40X, including attachments, to:
Indiana Department of Revenue
100 North Senate Ave.
Indianapolis, IN 46204-2253








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