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IRSCredits & Incentives (8800/8900 Series)

Official form guide

Form 8993: 8993

IRS Form 8993 is used to calculate a corporation’s Net Investment Income Tax (NIIT) under Section 199A. File it when the corporation’s aggregate net investment income exceeds the $6.25 million threshold for the tax year.

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Form Overview

IRS Form 8993 - 8993

IRS Form 8993 is used to calculate a corporation’s Net Investment Income Tax (NIIT) under Section 199A. File it when the corporation’s aggregate net investment income exceeds the $6.25 million threshold for the tax year.

It captures total net investment income, the $6.25 million exemption, and the 3.8% tax applied to the excess.

Risk Radar

Scan points
  • 1A single mis‑calculation can trigger a $10,000 penalty per failure.
  • 2Using the wrong exemption amount for the tax year
  • 3Misclassifying active business income as investment income
  • 4Omitting certain deductible expenses
  • 5Applying the 3.8% rate to the wrong base

Plain English

This form tells the IRS how much extra tax a corporation owes if it earns a lot of passive income, like interest or rents, beyond a set limit. It’s a simple worksheet that turns your investment income numbers into a tax amount.

Submission Date

  • Filing date: 2026-01-08 16:10:44
  • Preparation window: collect IDs, supporting records, and signatures in advance.
  • Final review: verify names, dates, and required fields before submission.

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Glossary Terms

income taxexemptioninterestincomelimit

Hover a term to preview the meaning.

What this form is for

  • Use when corporate net investment income exceeds $6.25 million.
  • Do not use for individuals; they file Form 8960.
  • If the corporation has no net investment income, skip the form.

Form selector

Use this form or another form?

Individual with investment income > $200k

Calculates personal NIIT

✓ Verify filing status first

Form 8960

Partnership with NIIT liability

Allocates NIIT to partners

✓ Ensure partnership agreement allows allocation

Form 8993‑A (Schedule A)

Deadline or filing window

Attach Form 8993 to the corporate return and file by the return’s due date, typically the 15th day of the fourth month after the corporation’s year‑end (including extensions). If an extension is granted, the attached 8993 follows the extended deadline.

  • —Total investment income | Sum of interest, dividends, rents, royalties, capital gains | Net investment income | Verify all sources are included
  • —Excess over exemption | Net investment income – $6.25 million | Taxable NIIT base | Do not let result go negative
  • —NIIT amount | Taxable NIIT base × 3.8% | NIIT liability | Round to nearest cent

Checklist

What you need before filling it out

1

Net investment income total

Bank statements, brokerage statements, rent rolls · Financial records

⚠ Forgetting foreign source income✕ Medium
2

Deductible expenses

Schedule C, depreciation schedules · Accounting books

⚠ Double‑counting expenses✕ High
3

Exemption amount

IRS notice for the tax year · IRS publications

⚠ Using outdated $5 million figure✕ Low
4

NIIT calculation

Worksheet on Form 8993 · Internal spreadsheet

⚠ Rounding errors✕ Medium
5

Signature

Corporate officer signature on Form 1120/1120‑S · Physical signature page

⚠ Missing signature leads to rejection✕ High

Before you submit

  1. 1Confirm the corporation’s tax year matches the form’s edition.
  2. 2Verify total net investment income is calculated correctly.
  3. 3Apply the correct $6.25 million exemption for the tax year.
  4. 4Multiply excess by 3.8% and round as instructed.
  5. 5Enter the NIIT amount in the proper line on Form 8993.
  6. 6Attach Form 8993 to the corporate Form 1120 or 1120‑S.
  7. 7Check that the corporate return is signed and dated.
  8. 8If filing paper, use the correct IRS mailing address.
  9. 9If e‑filing, ensure the electronic transmission includes the 8993 attachment.
  10. 10Retain all supporting schedules for at least three years.
  11. 11Confirm the filing deadline (including extensions) is met.

How to file this form

  1. 1Gather all investment‑related income statements for the year.
  2. 2Calculate net investment income after allowable deductions.
  3. 3Subtract the $6.25 million exemption; if result is positive, compute 3.8% tax.
  4. 4Complete Form 8993 lines 1‑5 with the calculated figures.
  5. 5Attach the completed Form 8993 to the corporate Form 1120 or 1120‑S.
  6. 6File the combined return electronically or mail to the address in the 1120/1120‑S instructions.
  7. 7Keep a copy of the attached 8993 and all source documents.

Known limitations

  1. 1Form does not provide guidance for mixed active and passive income; users must separate manually.
  2. 2The $6.25 million exemption is indexed annually; older versions may list a different amount.
  3. 3No automatic validation of rounding; users must follow IRS rounding rules.
  4. 4Electronic filing systems may require a separate attachment flag; failure to set it can cause the form to be omitted.

Field map

Compact field-by-field guide

6 fields

Entity Info

1 items

Taxpayer Name and TIN

Name and taxpayer ID of the entity claiming the credit.

Requiredtext

Credit Info

1 items

Credit Type

Type of credit or incentive being claimed.

Requiredselect

Calculation

2 items

Qualifying Amount

The base amount used to calculate the credit.

Requiredamount
Credit Amount

Calculated credit amount after applying formulas and limitations.

Requiredamount

Certification

1 items

Supporting Information

Detailed breakdown supporting the credit calculation.

text

Signatures

1 items

Signature

Sign and date the form.

Requiredsignature
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Current form status
IRS

Form 8993 is currently in its 2024 revision, effective for tax years beginning after January 1 2024. Check the IRS website for any later updates before filing.

What changed or needs a fresh check

  • Edition date: 2024 (verify on the top of the form)
  • Fee: No separate filing fee
  • Mailing address: Use the address for Form 1120/1120‑S as listed in the instructions
  • Electronic filing: Supported via IRS e‑file for corporate returns
  • Signature requirement: Corporate officer must sign the attached 1120/1120‑S, not the 8993 itself

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Quick Facts

Corporations, including S‑corporations, that have net investment income above the $6.25 million threshold must file.
It captures total net investment income, the $6.25 million exemption, and the 3.8% tax applied to the excess.
Attach Form 8993 to the corporation’s original Form 1120 or 1120‑S when the return is due (generally the 15th day of the 4th month after year‑end).
File electronically with the corporate tax return via the IRS e‑file system, or mail the paper return to the address listed in the Form 1120/1120‑S instructions.
Errors can trigger a $10,000 penalty per failure and may cause the NIIT to be under‑ or over‑paid, leading to interest and additional penalties.
1. Gather all interest, dividends, rents, royalties, and capital gains for the tax year. 2. Subtract allowable deductions to arrive at net investment income. 3. Compare the total to the $6.25 million exemption. 4. Multiply any excess by 3.8% and enter the result on Form 8993. 5. Attach the completed form to the corporate return.

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After you file

  1. 1Store the filed return and attached Form 8993 in a secure location.
  2. 2Keep all source documents (interest statements, rent rolls, etc.) for at least three years.
  3. 3Monitor IRS notices for any adjustments to the NIIT liability.
  4. 4If a penalty notice arrives, compare the reported figures to your calculations.
  5. 5Update internal accounting procedures to capture investment income correctly for the next year.

Sources

  • SRCForm 8993 title and purposeIRS official form header
  • SRCExemption amount $6.25 millionIRS instructions for 2024
  • SRCNIIT rate 3.8%Section 199A statutory rate
  • SRCFiling deadline tied to Form 1120/1120‑S due dateIRS filing calendar
  • SRCNo separate filing feeIRS fee schedule
  • SRCElectronic filing supportIRS e‑file guide for corporate returns
  • SRCSignature requirementForm 1120/1120‑S instructions
  • SRCPenalty amount $10,000 per failureIRS penalty provisions for NIIT

Common confusion points

Exemption amount

Often confused with the individual $200k threshold

→ Verify corporate exemption in current instructions

Active vs. passive income

Income from a trade or business may be mis‑treated as investment

→ Review IRS definitions of net investment income

Rounding rules

IRS requires rounding to nearest cent, not truncating

→ Double‑check final NIIT figure

Form attachment

Some filers think 8993 is a stand‑alone return

→ Remember it must be attached to Form 1120/1120‑S

Extension timing

Extension applies to the whole return, not just 8993

→ File the attached form by the extended deadline

Workflow map

Related forms and next steps

4 signals

Before

Form 1120 or 1120‑S – primary corporate tax return

Current

8993

After

Form 8962 (if health coverage credit interacts) | May affect overall tax liability

Often used with

Schedule K‑1 (if partnership allocation needed) | To allocate NIIT to partners

⚠ If something goes wrong

  • Form 843 – Claim for Refund or Credit | To request relief for NIIT penalties

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Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
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