Form 1099-INT Instructions: How to Stay Compliant in 2026

Those of you paying out interest income must be aware of Form 1099-INT. It’s the go-to information return that reports interest payments of $10 or more to recipients in a tax year.

Making sense of this form is not really complex. What are the Form 1099-INT instructions? What filing deadlines should you follow? Are there any penalties if you slip-up? We’ll tell you all about it in this quick guide.

About Form 1099-INT

Form 1099-INT reports interest income paid to account holders or investors during the tax year. And the filer is any entity that pays interest to the recipient. Think of banks, credit unions, brokerage firms, financial institutions or businesses that pay interest.

• You must file Form 1099-INT if:
• You paid $10 or more in reportable interest (Boxes 1, 3, or 8)
• You paid $2,000 or more of interest as part of a trade or business
• You withheld and paid any foreign tax on interest

Withheld any federal income tax under backup withholding rules and didn’t refund it

Some examples of interest income reported on this form are interest on savings or checking accounts from banks, interest earned on U.S. bonds or Treasury notes, interest from business accounts or escrow arrangements, etc.

Key Information You Need to File 1099-INT

You need a good foundation for filing any form. It starts with gathering all the important details and documents. Here’s all that you’re going to need:

• Payer’s full legal name, address and TIN
• Recipient’s full legal name, current address and TIN (SSN or EIN)
• The total amount of interest paid during the calendar year
• If there’s any federal income tax that was withheld
• If any foreign tax was paid along with country details
• State filing information, if required

Note: It’s best to validate the recipient’s TIN using a completed W-9 form to avoid mismatches and penalties.

Form 1099-INT Instructions

1. Once you’ve determined whether 1099-INT filing is needed and gathered all the details, you can start your filing journey. Here’s how to go about it.

2. Check if you have to eFile. It’s mandatory if you’re filing 10 or more returns in total (combining W-2s, 1099s and 1098s), unless you have a waiver from the IRS.

3. Next, choose your eFiling method. You can do this using the IRS IRIS portal or set up an account with an IRS-approved e-filing provider that has a valid Transmitter Control Code (TCC), like 1099Online.

4. Enter the payer and recipient details you’ve collected.

5. Fill out the specific boxes on Form 1099-INT. This is an important step:

• Box 1: One of the most important boxes in 1099-INT. Mention the total taxable interest paid to the recipient
• Box 2: Enter any early withdrawal penalty (from CD or similar account before maturity)
• Box 3: Interest on U.S. Savings Bonds and Treasury Obligations goes here
• Box 4: Report if you withheld any federal income tax from interest income (applied if the recipient’s TIN was missing or incorrect)
• Box 6: Used to report foreign tax paid
• Box 7: Foreign country or U.S. territory
• Box 8: Interest from municipal bonds that are generally exempt from tax

6. Review all the details. Check if anything is missing and if any dollar amount or spelling is incorrect.

7. Submit your 1099-INT forms to the IRS and send copies to the recipient before the deadline.

8. Monitor the status of your filing. Once accepted, download and store all forms along with supporting documentation for at least 4 years.

1099-INT Deadlines You Must Know

You shouldn’t compromise on punctuality when it comes to IRS deadlines. Here are the standard due dates to file your 1099-INT forms:

• Send recipient copies by January 31
• eFile with the IRS by March 31
• Paper-file with the IRS by February 28

Suppose the due date falls on a weekend or legal holiday, the deadline shifts to the next business day.

Note: If you need extra time to file your returns, you can use Form 8809. File this by the original due date to get an automatic 30-day extension.

What Are the Penalties?

The penalties can add up faster than you think if you’re complacent. The following are the IRS penalties for the 2026 tax year.

• $60 per return – Filed within 30 days of the due date
• $130 per return – Late by more than 30 days but filed by August 1
• $340 per return – After August 1 or don’t file at all
• $680 per return – Intentional disregard

Mistakes To Avoid

Minor slip-ups happen. Watch out for these errors that filers usually make.

• Incorrect recipient TIN or address is pretty common. Always make sure that you use the most recent W-9 form.
• Reporting incorrect interest amounts or entering it in the wrong box. Always verify against your bank or accounting statements.
• Forgetting to send recipient copies. You can set up reminders closer to the deadline to avoid this.
• Forgetting to report backup withholding. Leaving it blank when you applied backup withholding can lead to IRS notices and penalties.
• Filing by paper when there are 10 or more total returns to file.

Final Thoughts

Many businesses will need to brace themselves for certain tax reporting changes brought in by the OBBBA. While the reporting threshold for a few forms has been increased (1099-NEC, 1099-MISC, 1099-K), the current $10 rule still applies to Form 1099-INT.

Beyond the threshold changes, the IRS is overhauling its e-filing portal with the retirement of FIRE. For the 2027 filing season, it will be replaced with IRIS, a more efficient and modernized intake system.

Ultimately, preparing for the 2026 tax year (filed in 2027) goes beyond applying the right thresholds or following Form 1099-INT instructions accurately. It also means testing and updating your systems and internal processes to ensure a smooth transition to IRIS.

1099Online has already migrated to IRIS, meaning our users enjoy a seamless filing experience with no extra transition costs or technical headaches (compared to other software that are still relying on FIRE). This head start will give 1099Online users stability, a predictable platform performance, an established support and knowledge base, and no downtime risks that come with major system migrations.

FAQs

1. Is there a minimum amount at which I have to file Form 1099-INT?

You’ll generally have to file 1099-INT when the interest payment to account holders is $10 or more.

2. Do I have to always eFile Form 1099-INT?

Not necessarily. E-filing is only mandatory if you have 10 or more returns in total, but it’s always the faster, more secure, and more reliable method than paper-filing.

3. Is there any change in 1099-INT reporting threshold due to the passage of the OBBBA?

According to current IRS guidance for 2026, Form 1099-INT’s reporting threshold is $10 or more (financial institutions) that applies to amounts reportable in boxes 1, 3, or 8. While the $2,000 threshold is specifically for interest payments made by businesses outside of typical banking.

4. How does my filing change when backup withholding is involved?

If you applied backup withholding (24%), you must file 1099-INT regardless of the amount.

5. What’s the penalty for filing after August 1?

If you file after August 1, the penalty is $340 per return. Always file as soon as possible to minimize penalty exposure.