1040 Instructions - Step 1 - Name and Address

Sep 19, 2026

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IA 1040 instructions for tax year 2024 explain prerequisites before completing the Iowa return, including completing the federal 1040 or 1040-SR and using the same line references. Guidance covers rounding rules, when and how to round cents to whole dollars, and processing impacts if software cannot calculate credits to the cent. Updates include Iowa-specific rate and checkoff changes, Schedule 1 modifications, and new credits and deductions that must be claimed through the correct Iowa forms and lines.

LanguageEnglish

CategoryForms

FormatPDF

Pages96

Reading Time34 min

AccessFree to download

What’s New for 2024

Before You Begin

Who Must File?

Conformity with the Internal Revenue Code

Filing Status

Exemption Credits

IA 1040 Schedule 1

Third Party Designee

Signature

Contacts

Amending Tax Returns

Estimated Payments

Extension Requests

Record Keeping

Submitting Your Return

What to Do If You Do Not Receive Your W-2

Iowa Modifications (Schedule 1)

1040 Instructions Step 1 6 Step 2 7 Step 3 8 Step 4 9 Step 5 12 Step 6 42 Step 7 53 Step 8 55 Step 9 75 Other Information What’s New for 2024 3 Before You Begin 4 Who Must File? 5 Conformity with the Internal Revenue Code 6 Filing Status 7 Exemption Credits 8 IA 1040 Schedule 1 61 Third Party Designee 75 Signature 75 Contacts 76 Amending Tax Returns 77 Are You a Resident of Iowa for Tax Purposes? 77 Certified Tax Returns for Nonresidents 78 Confidentiality 78 Credits: Refundable or Nonrefundable-What's the Difference? 79 Do You Owe Tax? Here Are Your Payment Options 79 Estimated Payments 80 Extension Requests 81 Farmers and Commercial Fishers 82 Federal Bonus Depreciation / Section 179 82 Injured Spouse 82 Iowa and Illinois Reciprocal Agreement 83 Iowa Income Tax Responsibilities of Native Americans 84 Iowa Tax Responsibilities of Servicemembers and their Spouses 84 Iowans Paid in Foreign Currency 91 Mailing Address for Returns and Payments 91 Net Operating Losses 91 Nonresidents and Part-Year Residents 91 Nonresidents with Gambling Winnings 92 Record Keeping 92 Refunds May Be Used to Pay Debt 92 Submitting Your Return 93 Use Tax 93 What to Do If You Do Not Receive Your W-2 94 What’s New for 2024 Before You Begin Prior to completing the IA 1040, complete either the federal 1040 or 1040-SR. The federal form must be completed even if there is no federal filing requirement, for purposes of completing the IA 1040. Also, note that the line references are the same on the federal 1040 and 1040-SR. Rounding off to Whole Dollars: You can round off cents to whole dollars on your return and schedules. If you do round to whole dollars, you must round all amounts. To round, drop amounts under 50 cents and increase amounts from 50 to 99 cents to the next dollar. For example, $1.39 becomes $1 and $2.50 becomes $3. If you have to add two or more amounts to figure the amount to enter on a line, include cents when adding the amounts and round off only the total. If you are entering amounts that include cents, make sure to include the decimal point. If the Department needs to adjust your tax return, the adjustment will be calculated to the cent. Rounding of IA 148 credits: The Department cannot allow IA 148 credits for more than what is calculated or awarded. If your software does not allow the calculation of tax credits to the cent, the processing of your return may be delayed if the credit is rounded up to a higher amount than what is specifically allowed or awarded. Line 5: The tax rates for each tax bracket have decreased. For tax year 2025, Iowa will have a single tax rate of 3.8% . Line 21: The State Fair Fund-Corndog Checkoff and the Firefights/Veterans Fund checkoffs received the lowest aggregate contribution amounts for the previous two years and, as required by Iowa Code section 422. 12E, have been repealed effective December 31, 2023. Iowa Modifications (Schedule 1) ● Partnership and/or S corporation Modifications-Beginning in tax year 2024, any partnership and/or S corporation modifications should be reported on Schedule 1, line 3. ● Military retirement income-Beginning in tax year 2024, the military retirement income exclusion should be reported on Schedule 1, line 4. ● Surviving Spouse Pension Income Exemption-For tax years beginning on or after January 1, 2024, a surviving spouse may exclude amounts received from a deceased spouse’s pension on Schedule 1, line 7, regardless if the deceased spouse was 55 years of age or older or disabled, if the pension was from employment in a protection occupation, or as a sheriff, deputy sheriff, firefighter, or police officer. ● Transfers from Iowa 529 Plan to Roth IRA Exemption. Taxpayers who make a qualifying transfer from an Iowa 529 plan to a Roth IRA on or after January 1, 2024 are no longer required to add-back the amount previously deducted on Schedule 1, Line 11. ● 529 Plan (ISa

FAQs

What must be completed before finishing the IA 1040?

Complete the federal 1040 or 1040-SR before completing the IA 1040, even if no federal filing requirement exists. The line references match between the federal forms and the IA 1040.

How should amounts be rounded on the IA 1040 and schedules?

You may round cents to whole dollars, but if you do, you must round all amounts. Drop amounts under 50 cents and round 50 to 99 cents up to the next dollar, and include cents when adding multiple amounts before rounding.

Where are Iowa-specific modifications reported?

Iowa modifications are reported on IA 1040 Schedule 1 starting in tax year 2024 for items such as partnership/S corporation modifications and certain income and exemption-related changes.

Sep 19, 2026

Upload by Dozel