Guide · Corrections

By File720Online Editorial Team · April 17, 2026

How to Amend Form 720: Filing a Corrected Return

Made a mistake on a previously filed Form 720? An amended return corrects errors and updates the IRS record. This guide explains when to amend, how to do it, and what to expect.

File Form 720 Common Filing Mistakes

Quick Answer

To amend Form 720: check the "Amended Return" box, complete the entire form with correct information for the same quarter, calculate any additional tax due or overpayment, and file. E-filed amendments are accepted through IRS-authorized providers.

How to File an Amended Form 720 — Step by Step

Identify the Error

Determine exactly what was wrong with the original return. Common errors include: wrong EIN, incorrect tax amounts (miscalculated rates or quantities), omitted schedules, wrong quarter, or missing credits.

Obtain the Correct Form 720 for That Quarter

Use the same version of Form 720 that was in effect for the quarter you are amending. IRS forms are periodically revised — using the wrong year's form can cause additional problems.

Check the "Amended Return" Box

At the top of Form 720, check the box labeled "Amended Return." This signals to the IRS that this return supersedes a previously filed return for the same period.

Complete the Entire Form with Correct Information

Do not just enter the changes — enter the complete corrected return. All schedules, all tax lines, and all credits should reflect the correct amounts for the entire quarter.

Calculate the Balance Due or Overpayment

Subtract the amount already paid (from the original return and any deposits) from the correct total tax. If there is additional tax due, include payment. If you overpaid, you can request a refund or apply it to a future period.

File the Amended Return

E-file the amended Form 720 through File720Online. Amended returns can be e-filed for most quarters. Check the IRS e-file instructions for any period-specific restrictions on electronic filing of amendments.

Common Reasons to File an Amended Form 720

Wrong EIN on original return

File amended return with correct EIN — may also require IRS contact to link records

Incorrect tax amount (wrong rates or quantities)

Recalculate using correct rates from IRS Publication 510

Omitted schedule or tax category

Include all applicable schedules in the amended return

Missed Schedule C credits

Add credit claims on the amended Schedule C

Wrong quarter reported

File the original quarter correctly with amended return checkbox

Mathematical errors

Minor math errors may be self-corrected by IRS without amendment needed

Common Filing Mistakes

Errors that require amendments

Schedule C Credits

Missed credits you can still claim

Form 8849 Refund Guide

Claiming refunds for overpaid taxes

Frequently Asked Questions

When should I file an amended Form 720?

File an amended Form 720 when the original return contained an error that changes your tax liability. This includes miscalculated tax amounts, wrong EIN, omitted schedules or categories, incorrect credits claimed, or tax applied to an incorrect period. Minor mathematical errors that the IRS can self-correct may not require an amendment — the IRS will typically adjust and notify you.

How do I indicate that Form 720 is an amended return?

Check the "Amended Return" checkbox at the top of Form 720. This checkbox signals to the IRS that this return replaces a previously filed return for the same quarter. File720Online includes the amended return checkbox in the e-filing workflow.

Can I file an amended Form 720 electronically?

Yes, amended Form 720 returns can generally be e-filed through IRS-authorized e-file providers. File720Online supports e-filing of amended returns. E-filing is faster and more reliable than paper, and you get an IRS acceptance confirmation the same day.

What is the deadline to file an amended Form 720?

There is no specific deadline to file an amended return — you can file at any time to correct an error. However, if you are amending to claim a refund, the claim must generally be filed within 3 years of the date the original return was filed (or 2 years from the date the tax was paid, whichever is later). For additional taxes owed, file as soon as possible to minimize interest and penalties.

Will the IRS penalize me for filing an amended return?

Filing an amended return does not itself trigger penalties. If the amendment shows additional tax was owed, the IRS may assess penalties and interest based on when the tax should originally have been paid. However, voluntary correction is generally treated more favorably than IRS-discovered errors. Filing an amendment promptly demonstrates compliance intent.

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Disclaimer: The information provided in this article is for general informational purposes only and should not be relied upon as legal, tax, or professional advice. Tax laws and regulations are subject to change, and their application can vary based on individual circumstances. Consult a qualified tax professional or attorney for advice specific to your situation. File720Online is an IRS-authorized e-file provider and does not provide legal or tax advice.