Iowa sales tax is filed online through GovConnectIowa, the Iowa Department of Revenue's portal, on a single combined sales and use tax return. Monthly returns are due on the last day of the month after the reporting period, and annual returns on January 31 of the following year. If you had no sales for the period, the Department says you must still file a return showing $0 sales.
This guide covers who files and how often, how to file in GovConnectIowa, how local option tax works, how to report no sales, how to amend a return, how to pay, and what late filing costs. The steps follow the Department's own pages, checked on September 29, 2026. Sources are listed at the end.
This article is educational information, not tax advice. Filing rules, thresholds, and penalties can change, so confirm current requirements with the Iowa Department of Revenue before you file.
Iowa sales tax filing at a glance
- Who administers it: Iowa Department of Revenue.
- Online portal: GovConnectIowa, at govconnect.iowa.gov. Quick Pay is available if you do not yet have a login.
- Return: One combined sales and use tax return. Since July 1, 2022, sales tax, retailer's use tax, and consumer's use tax are reported on the same return under one permit.
- Filing frequency: Annual if you collect less than $1,200 in sales and use tax a year. Monthly if you collect $1,200 or more. Seasonal filers file only for their active months.
- Due dates: The last day of the month after the period for monthly and seasonal filers, and January 31 for annual filers. A weekend or holiday moves the date to the next day that is not one.
- Zero returns: Required. The Department says to file showing $0 sales.
- Electronic filing: Monthly and seasonal filers must file and pay electronically. Annual filers may file online or on paper.
- State rate: 6%, plus a 1% local option tax in many cities and counties.
- Economic nexus: $100,000 or more in gross revenue from Iowa sales. There is no transaction-count test.
Who has to file, and how often
You need an Iowa sales and use tax permit and must file returns if you are a retailer with a physical presence in Iowa, a remote seller with $100,000 or more in gross revenue from Iowa sales, or a marketplace facilitator that makes or facilitates $100,000 or more in Iowa sales. A business that makes no taxable retail sales does not need a permit; the Department's example is a retailer that sells only exempt unprepared food. Our Iowa sales tax guide covers registration, nexus, and taxability in more detail, and our economic nexus explainer covers how thresholds work in general.
The nexus test counts all gross revenue from Iowa sales, including exempt sales, wholesale sales, and sales through a marketplace. If you sell only through a marketplace facilitator that collects Iowa tax, the Department says you do not need a permit or a return for those sales, because the facilitator reports them.
The Department assigns your frequency from the tax you estimated on your permit application.
| Frequency | Who it applies to | Due date | Filing method |
|---|---|---|---|
| Annual | Less than $1,200 in sales and use tax a year | January 31 after the calendar year | GovConnectIowa or paper |
| Monthly | $1,200 or more a year. Hotel and motel, auto rental, and construction equipment taxpayers file monthly regardless of amount | The last day of the following month | Electronic filing and payment required |
| Seasonal | $1,200 or more collected in four or fewer months a year, which can be nonconsecutive | The last day of the following month, for your active months | Electronic filing and payment required |
Moving to seasonal status takes a new permit. The Department says you cannot switch with a Business Change Form; you cancel your current permit and register again. A business under the $1,200 threshold may ask to file monthly, but one at or above it must file monthly. Request a frequency change in GovConnectIowa or with the Business Change Form (92-033). Since July 2022, payments are due only when a return is filed, so deposit payments are optional.
Before you start: get into GovConnectIowa
You need a permit before you can file. To register a business, create a GovConnectIowa account, log in, choose Register a New Business, and follow the prompts. Keep the confirmation number shown at the end. Have your business's legal name, location and mailing address, Federal Employer Identification Number (FEIN), NAICS code, the name, address, and Social Security number of each managing owner, partner, or officer, and a contact email and phone number ready. Iowa also belongs to the Streamlined Sales Tax registration system if you need permits in several member states. See our sales tax permit overview for the general process.
If you created a login for an existing permit, you still need to request access to your tax account. Select Request Access to an Account, and the Department mails a letter with a unique Access Code. Quick Pay still works while you wait. Drafts are saved for 30 days, passwords expire after 18 months, and you are logged out after 30 minutes of inactivity.
Step-by-step: filing an Iowa return in GovConnectIowa
- Log in to GovConnectIowa at govconnect.iowa.gov and open your sales and use tax account.
- Choose the period. Pick the monthly, seasonal, or annual period assigned to your account.
- Report your sales. Enter gross receipts and any exempt or excluded sales on the lines the return provides. The Department's FAQ notes that a sales-tax-included price must be divided by 1.06, or 1.07 where a 1% local option tax also applies, to find the taxable amount.
- Report use tax. The single return has one use tax section, with separate lines for taxable purchases and sales subject to use tax.
- Review and submit. Check the totals, then submit. Save the confirmation number.
- Pay. Pay from a bank account or credit card in GovConnectIowa, and keep the payment confirmation with your records.
Local option tax and rate pitfalls
Iowa's 6% state rate is only part of the total. Many cities and counties add a 1% local option sales tax, so the combined rate is 7% across most of the state, but not everywhere. The Department says the seller charges the local option tax that applies where the customer receives the item, and if delivery is not in a local option jurisdiction, none is due. Local option tax is figured on the sale amount without the state tax, so it is added to the state tax, not stacked on top of it.
Remote sellers and marketplace facilitators required to hold a permit must collect state and local option tax on all taxable Iowa retail sales. Charging one rate on every sale over- or under-collects, so check the delivery location. Our Iowa sales tax calculator shows current rates by location.
Due dates and the weekend rule
Monthly and seasonal returns are due on the last day of the month after the reporting period. Annual returns are due January 31. When the due date falls on a Saturday, Sunday, or holiday under Iowa Code 421.9A, it moves to the next day that is not one. For the rest of 2026 and the start of 2027:
| Period | Due date |
|---|---|
| August 2026 | September 30, 2026 |
| September 2026 | November 2, 2026 (October 31 is a Saturday) |
| October 2026 | November 30, 2026 |
| November 2026 | December 31, 2026 |
| December 2026 and annual 2026 | February 1, 2027 (January 31 is a Sunday) |
Payments through GovConnectIowa must be transmitted by 11:59 p.m. Central time on the due date to be timely, and cannot be edited after 6:00 p.m. A first-time payment is verified with your bank and can take up to five business days to apply, which may create a balance due; the Department says the resulting penalty and interest are removed automatically once the payment posts. See all states in one calendar on our sales tax due dates page.
Filing a zero return
You must file even if you had no sales. The Department's sales tax FAQ says that if you had no sales for your filing period, you must still file your return showing $0 sales. An annual filer with no sales files the annual return by January 31; a monthly filer files every month. If the business has closed and you no longer need the permit, submit the Business Cancellation Form (92-034) instead of continuing to file.
Amending a return
If you find an error on a return you already filed, file an amended return and pay any additional tax due, including interest. In GovConnectIowa you can amend returns for tax periods that appear in the portal, but the Department says amended periods are limited to three years. To amend a return that was filed outside GovConnectIowa, file a new return for the tax period. To claim back tax paid on materials you later resold, the Department points to the Claim for Refund (IA 843).
Payment methods
- GovConnectIowa: Pay from a bank account or credit card when you file. The Department's FAQ lists these two methods for online payment.
- Quick Pay: Available on the GovConnectIowa homepage if you have no login or no access to your account. You will be asked to validate the account with your permit number, filing frequency, tax period, and your business identifier.
- ACH credit: The Department's penalties page lists ACH credit alongside GovConnectIowa as a way to meet the electronic payment requirement.
- Mail or in person: The Department also accepts these, but they do not satisfy the electronic payment rule for monthly and seasonal filers.
If your bank requires the Department's Bank Filter (Company-ID) for ACH debits, the Department's FAQ lists it as 9426004574. The pages we reviewed do not state a card fee, so confirm the fee on the payment screen before you submit.
Penalties and interest for late filing and payment
The Department's penalties page lists these charges for sales and use tax:
- Failure to timely file: 5% of the unpaid tax, if you do not file by the due date and paid less than 90% of the correct tax.
- Failure to timely pay: 5% of the unpaid tax, if you paid less than 90% of the correct tax by the due date. You may owe both penalties.
- Failure to file after demand: $1,000 for each unfiled return listed in a demand letter, if you still have not filed 90 days after the demand. This is in addition to the penalties above.
- Not paying or filing electronically when required: 5% of the tax due for a payment not received through GovConnectIowa or by ACH credit, and 5% for not reporting the return through GovConnectIowa.
- Audit deficiency: 5% of the unpaid tax.
- Fraud or willful failure to file: 75%, which cannot be waived.
Interest for calendar year 2026 is 10.0% a year (0.8% a month). Penalties can be waived in limited circumstances under Iowa Code section 421.27. You can request a waiver on the Penalty Waiver Request form (78-629) or, for eligible tax types, in GovConnectIowa. The Department's list of qualifying circumstances is on the form.
Common mistakes to avoid
- Skipping zero returns. Every assigned period needs a return, even with $0 in sales.
- Filing or paying by the wrong method. Monthly and seasonal filers who file or pay another way face a 5% penalty. A filer who cannot file electronically can ask the Director in writing, with proof, for permission to file on paper.
- Using one rate for every sale. Local option tax applies based on where the customer receives the item.
- Missing the annual-to-monthly switch. A business that collects $1,200 or more a year files monthly.
- Missing your frequency letter. The Department mails a letter with your frequency, and it also appears under View Letters in GovConnectIowa. Update your address with Form 92-033 if you are not receiving mail.
- Paying at the last minute the first time. First-time payments can take up to five business days to verify.
If you receive a sales tax notice
A missed or late return often leads to a letter. Our Iowa sales tax notices guide explains the notices the Iowa Department of Revenue sends, including Estimated return billing, Notice of Assessment, and Financial institution levy / administrative wage levy. It also covers how to ask for penalty relief: Penalty Waiver Request (Form 78-629). The state's time limit to dispute an assessment: 60 days from the date on the Notice of Assessment. Check the date on the notice, match it to your filing period, and follow the instructions on the notice itself.
Next steps for Iowa sellers
- Download Iowa's due dates as a calendar file, or see them on the due dates page.
- Check the combined rate for any Iowa address.
- Get the Iowa resale certificate to buy inventory without paying tax.
- Check whether you have nexus in other states before your sales cross a threshold.
More state filing guides
Filing in more than one state? These step-by-step guides cover the portals, due dates, and penalties in other states. See them all in our state-by-state guide to filing sales tax online.
- How to file Wisconsin sales tax online
- How to file Nebraska sales tax online
- How to file Illinois sales tax online
Let Kintsugi file for you
If you sell in Iowa and other states, Kintsugi's sales tax filing software prepares and files returns on each state's assigned schedule and remits payment. Monitoring across every US state is free, so you know when you cross a threshold. Filing starts at $75 per filing or registration, with no per-state subscription. See pricing, start free, or book a demo.
Frequently asked questions
How do I file Iowa sales tax online?
Log in to GovConnectIowa, open your sales and use tax account, choose the period, report your sales and any use tax, submit the return, and pay from a bank account or credit card. Monthly and seasonal filers must file and pay electronically.
When is Iowa sales tax due?
Monthly and seasonal returns are due on the last day of the month after the reporting period. Annual returns are due January 31. If that day is a Saturday, Sunday, or holiday, the due date moves to the next day that is not one.
Do I have to file if I had no sales?
Yes. The Department says a return showing $0 sales is still required for the filing period.
How often do I file Iowa sales tax?
The Department assigns it. Businesses collecting less than $1,200 in sales and use tax a year file annually, and those collecting $1,200 or more file monthly. Businesses that collect for four or fewer months a year can register as seasonal filers.
What is the economic nexus threshold in Iowa?
$100,000 or more in gross revenue from Iowa sales, which includes exempt and wholesale sales. Iowa has no transaction-count test.
What if I miss the deadline?
File and pay as soon as possible. Iowa charges 5% of the unpaid tax for failing to file and 5% for failing to pay, and interest is 10.0% a year for 2026. You can request a penalty waiver on Form 78-629 or, for eligible tax types, in GovConnectIowa.
Can I pay Iowa sales tax by credit card?
Yes. In GovConnectIowa you can pay from a bank account or credit card. Quick Pay is available if you have no login, and monthly and seasonal filers must pay electronically, through GovConnectIowa or by ACH credit. The pages we reviewed do not state a card fee.
Is electronic filing required in Iowa?
For monthly and seasonal filers, yes: return and payment must be filed and paid electronically, and the wrong method draws a 5% penalty. Annual filers, who collect under $1,200 a year, may file online or on paper.
Is there a discount for filing Iowa sales tax on time?
The agency pages and return instructions we reviewed describe no timely-filing discount or collection allowance for Iowa sales tax. Confirm with the Iowa Department of Revenue if you think one applies to your account.
Sources
Checked September 29, 2026.
- Iowa Department of Revenue, Filing Frequency & Return Due Dates
- Iowa Department of Revenue, Sales and Use Tax Permit, Return Filing, and Payment Changes
- Iowa Department of Revenue, Sales Tax Frequently Asked Questions
- Iowa Department of Revenue, GovConnectIowa Frequently Asked Questions
- Iowa Department of Revenue, Penalties and Interest Rates
- Iowa Department of Revenue, Permits, Filing Requirements, & Local Option Sales Tax
- Iowa Department of Revenue, Remote Sellers & Marketplace Facilitators
