In this article
- Quick facts: Filing for sales tax in Iowa
- When to file and pay Iowa sales tax
- Iowa sales tax filing deadlines
- How to prepare your Iowa sales tax return
- How to complete and file an Iowa sales tax return
- How to pay sales tax in Iowa
- What happens after filing and paying Iowa sales tax
- Late filing penalties and interest
- Getting third-party help with sales tax filing
- Sales tax filing in other states
If you're registered for Iowa sales tax, you must file returns and pay any tax due according to the filing frequency assigned by the Iowa Department of Revenue. This guide focuses on the filing and payment process most relevant to remote sellers and out-of-state businesses using GovConnect Iowa. Note that Iowa's due date is the last day of the month following the reporting period, which differs from the 20th deadline used by most other states.
For broader information about Iowa sales tax rules, rates, and exemptions, see the Iowa Sales Tax Guide. For details on how to get an Iowa Sales Tax Permit, see the Iowa Sales Tax Registration Guide.
Quick facts: Filing for sales tax in Iowa
Key information about filing Iowa sales tax returns, including filing frequency, deadlines, and payment options.
| Fact | Detail |
|---|---|
| Filing frequency | Monthly, quarterly, or annually |
| Filing deadline | The last day of the month after the period ends (not the 20th) |
| Filing portal | GovConnect Iowa |
| Zero returns required | Yes |
When to file and pay Iowa sales tax
The Iowa Department of Revenue will assign you a filing frequency (monthly, quarterly, or annually) after you register your business.
Iowa sales tax returns and payments are due at the same time, by the last day of the month following the end of the filing period. This differs from the 20th deadline used by most other states and is a common source of missed deadlines for businesses managing multi-state compliance. If the last day of the month falls on a weekend or holiday, the due date shifts to the next business day.
Iowa reduced its state sales tax rate from 6% to 5% effective January 1, 2025. Some Iowa jurisdictions also impose a 1% local option sales tax (LOST), which is reported and paid through the same GovConnect Iowa return.
Iowa sales tax filing deadlines
Iowa monthly filing due dates
Reports are due on the last day of the month following the reporting month.
| Month | Filing Deadline |
|---|---|
| January | February 28 |
| February | March 31 |
| March | April 30 |
| April | May 31 |
| May | June 30 |
| June | July 31 |
| July | August 31 |
| August | September 30 |
| September | October 31 |
| October | November 30 |
| November | December 31 |
| December | January 31 |
Iowa quarterly filing due dates
| Quarter | Filing Deadline |
|---|---|
| Q1 (January 1, March 31) | April 30 |
| Q2 (April 1, June 30) | July 31 |
| Q3 (July 1, September 30) | October 31 |
| Q4 (October 1, December 31) | January 31 |
Iowa annual filing due date
Reports for the previous year are due on January 31.
Important note: Zero returns
Once you have an Iowa Sales Tax Permit, you are required to file returns for every assigned period regardless of whether any sales tax was collected. When no sales tax was collected, you must file a zero return electronically through GovConnect Iowa.
How to prepare your Iowa sales tax return
Before working on your sales tax return, collect all sales information for the tax period.
Sales transactions
You need to know your total gross sales to Iowa buyers and your taxable sales. Iowa taxes digital goods and SaaS sold to customers in the state, so be sure to include those sales in your taxable totals.
Key reporting figures
In addition to your gross Iowa sales, filing a return requires:
- Total sales and income
- Taxable sales (subject to the 5% state rate and any applicable local option rate)
- Non-taxable sales and exemptions
- Deductions and adjustments
- Total sales tax collected from customers during the filing period
How to complete and file an Iowa sales tax return
Iowa sales tax returns are filed electronically through GovConnect Iowa and must be reported in US dollars.
Step-by-step: file an Iowa sales tax return
1. Collect all necessary information
Gather your sales records for the tax period. If you have sales in Iowa jurisdictions that impose a local option sales tax (LOST), you will need to identify those sales separately to apply the correct combined rate.
2. Log in and file online
- Log in to GovConnect Iowa.
- Navigate to your Sales and Use Tax account.
- Select the filing period you want to file.
- Enter your gross sales, taxable sales, exemptions, and total tax collected.
- Review and submit your return.
3. Receive confirmation
After submitting, you will receive a confirmation number. Save this as your record of filing.
How to pay sales tax in Iowa
Iowa requires businesses to file and pay electronically through GovConnect Iowa. You can pay directly within the portal after filing your return. Accepted payment methods include:
- ACH debit (direct bank transfer)
- Credit card (may be subject to a convenience fee)
What happens after filing and paying Iowa sales tax
After filing and paying, keep a copy of your return and payment confirmation for your records.
- Save your filing confirmation and payment receipt
- Keep records supporting the reported amounts
- Continue filing according to your assigned frequency, remembering Iowa's last-day-of-month due date
- File a zero return when required
➡ Need help understanding Iowa sales tax rules, rates, and nexus? See the Iowa Sales Tax Guide
➡ Need to register for Iowa sales tax? See the Iowa Sales Tax Registration Guide
Late filing penalties and interest
If you miss an Iowa sales tax filing deadline, file as soon as possible. Failure to file returns and remit collected tax on time results in penalties and interest charges that increase the longer you wait.
For current penalty rates and interest charges, refer to the Iowa Department of Revenue website.
Getting third-party help with sales tax filing
Quaderno can simplify your Iowa sales tax compliance by generating detailed tax reports and handling the filing process on your behalf. Connect your sales data and Quaderno manages the submission to the Iowa Department of Revenue, ensuring timely and accurate filing.
Sales tax filing in other states
- Arizona Sales Tax Filing Guide
- California Sales Tax Filing Guide
- Florida Sales Tax Filing Guide
- Georgia Sales Tax Filing Guide
- Illinois Sales Tax Filing Guide
- Kentucky Sales Tax Filing Guide
- Massachusetts Sales Tax Filing Guide
- New Jersey Sales Tax Filing Guide
- New York Sales Tax Filing Guide
- Ohio Sales Tax Filing Guide
- Pennsylvania Sales Tax Filing Guide
- Rhode Island Sales Tax Filing Guide
- South Carolina Sales Tax Filing Guide
- Texas Sales Tax Filing Guide
- Virginia Sales Tax Filing Guide
- Washington DC Sales Tax Filing Guide
Need help filing across multiple states?
Watch our webinar: US Sales Tax Registration & Filing Tips + AMA. Learn how international sellers register, file, and manage US sales tax compliance across multiple jurisdictions.
Note: At Quaderno we love providing helpful information and best practices about taxes, but we are not certified tax advisors. For further help, or if you are ever in doubt, please consult a professional tax advisor or the tax authorities.
