This Schedule A Form 8804 2026 guide explains the IRS Penalty for Underpayment of Estimated Section 1446 Tax by Partnerships. Schedule A for Form 8804 calculates a penalty for underpayment of estimated section 1446 tax under its applicable rules. Estimated installments, payment timing and the permitted computation method should be reconciled with the annual partnership withholding return. The schedule does not replace the underlying tax return.
Reviewed October 31, 2026. This is an independent guide. The version and availability information below identifies the IRS documents used for this page.
What Schedule A Form 8804 2026 does and who prepares it
A partnership uses the schedule when the estimated section 1446 tax underpayment calculation requires it.
For the connected reporting route, see Form 8804. Keep the role of that document separate from the task explained on this page.
| Official form | Form 8804 (Schedule A) |
|---|---|
| IRS title | Penalty for Underpayment of Estimated Section 1446 Tax by Partnerships |
| Guide period | 2026 |
| Target version | 2026 |
| Availability | Draft — not for filing |
| Last checked | October 31, 2026 |
Get the Schedule A Form 8804 2026 PDF and check its status
Use the IRS source to confirm the document before completing a real filing. The download link is a reference to the official file; it is not a statement that every copy inside the PDF may be printed and submitted. Follow any instructions about electronic filing, scannable copies, recipient copies or attachments.
Which version of Schedule A Form 8804 2026 should you use?
The 2026 in the title identifies the tax year or calendar-year information addressed by this guide. For a 2026 income reporting document, the preparation or filing activity may occur in 2027. Do not change the income year simply because the calendar has changed. The exact filing or furnishing date comes from the instructions for this form and the filer circumstances. The linked target PDF is a draft. It may be used to understand the proposed layout, but it is not a form to file. Amounts or instructions still subject to completion must be checked again when the final version is released.
Records to gather for Schedule A Form 8804 2026
- Annual withholding tax calculation.
- Installment liability workpapers.
- Payment dates and amounts.
- Prior return information.
- Applicable method support.
Keep a working reconciliation with these records. It should show the source of each reported item, any correction made before filing and the reason a different amount appears on a connected form. This is especially useful when a statement is corrected or a prior-year balance continues into the current calculation.
How to work through Schedule A Form 8804 2026
- Confirm applicability. Start with the purpose, filer category and version of the form. Complete any eligibility or applicability question before spending time on the numerical calculation.
- Prepare the source workpapers. Gather the records listed below and reconcile their totals. Keep prior-year balances, current-year transactions and estimated payments separate where they serve different purposes.
- Complete dependent calculations first. When a line refers to another form, schedule or worksheet, finish that supporting calculation first. Preserve any classification, limitation and carryforward information.
- Follow the line sequence. Use the actual line labels and arithmetic in the applicable form. A line number from an older version may refer to something different after a revision.
- Reconcile the filing package. Check names, identifying numbers, tax periods, totals and required attachments. Then use the filing method, signature process and deadline that apply to this filer and form.
Form-specific IRS instructions and reporting details
The following points retain the operative wording of the IRS documents linked above. Read each point with its stated conditions and the applicable form version. References to another form or section describe a connected requirement; they do not mean that every reader must file every referenced document.
Generally, the partnership doesn’t have to file this schedule because the IRS will figure the amount of the penalty and notify the partnership of any amount due. However, even if the partnership doesn’t owe a penalty, complete and attach this schedule to the partnership’s Form 8804, Annual Return for Partnership Withholding Tax (Section 1446) if the Part II, line 1, of Schedule A (Form 8804), amount is $500 or more and any of the following apply. 1. The adjusted seasonal installment method is used. 2. The annualized income installment method is used.
Additional reporting conditions
• Check one or both of the boxes in Part I that apply. If the partnership checks a box in Part I, attach Schedule A (Form 8804) to Form 8804.
Be sure to check the box on Form 8804, line 8. • If the total section 1446 tax, shown on Part II, line 1, is $500 or more, complete the rest of page 1 to determine the underpayment for any of the installment due dates. • If there is an underpayment on line 12 (column (a), (b), (c), or (d)), go to Part VII to figure the penalty. • Complete Parts IV through VI, as appropriate, if the partnership uses the adjusted seasonal installment method and/or the annualized income installment method.
Note: In these instructions, “Form 8804” generally refers to the partnership’s original Form 8804. However, an amended Form 8804 is considered the original return if it is filed by the due date, including extensions, of the original Form 8804. Also, for purposes of determining a required installment, if an amended Form 8804 is filed for the prior tax year, then “prior tax year” includes the amended Form 8804, but only if the amended Form 8804 is filed before the applicable installment due date.
Partnerships that have effectively connected taxable income (ECTI) allocable to foreign partners use Schedule A (Form 8804) to determine: • Whether they are subject to the penalty for underpayment of estimated tax and, if so; • The amount of the underpayment penalty.
Calculations and supporting information
Saturday, Sunday, or legal holiday, payments made on the next day that isn’t a Saturday, Sunday, or legal holiday are considered made on the due date to the extent the payment is applied against that required installment. Also include on line 6 any of the following. • Section 1446 tax paid or withheld by another partnership in which the partnership filing this Schedule A (Form 8804) was a partner during the tax year.
See the instructions for Form 8804, lines 6b and 6c, in the Instructions for Forms 8804, 8805, and 8813. • Section 1445(a) or 1445(e) tax withheld from or paid by the partnership filing this Schedule A (Form 8804) during the tax year for a disposition of a U.S. real property interest.
See the instructions for Form 8804, lines 6d and 6e, in the • Section 1446(f)(1) tax withheld from the partnership filing this Schedule A (Form 8804) during the tax year for a disposition of an interest in a partnership engaged in the conduct of a U.S. trade or business. See the instructions for Form 8804, lines 6f and 6g, in the Instructions for Forms 8804, 8805, and 8813.
Line 30. Annualization periods. Enter on line 30, columns (a) through (d), respectively, the annualization periods for the option listed below. For example, if the partnership elected Option 1, enter on line 30 the annualization periods 2, 4, 7, and 10, in columns (a) through (d), respectively.
Exceptions and related reporting
Line 31. Enter on lines 31a through 31e the ECTI allocable to all foreign partners for the months entered for each annualization period in columns (a) through (d) on line 30. If the partnership has certain extraordinary items, special rules apply. Don’t include on line 31a, 31b, 31c, 31d, or 31e the de minimis extraordinary items that the partnership chooses to include on line 33a, 33e, 33i, 33m, or 33q, respectively. See Extraordinary items, earlier.
Lines 33c, 33g, 33k, 33o, and 33s. Enter the reduction amounts resulting from certified partner-level items received from foreign partners using Form 8804-C. See Certification of Deductions and Losses in the Instructions for Forms 8804, 8805, and 8813, for additional information. The netting rules of section 1(h) and Notice 97-59 must be considered in determining the category of income the reduction amounts offset.
Part VI—Required Installments Line 38. Before completing line 38 in columns (b) through (d), complete lines 39 through 43 in each of the preceding columns. For example, complete lines 39, 40, 42, and 43 in column (a) before completing line 38 in column (b).
Lines 33b, 33f, 33j, 33n, and 33r. Enter the reduction amounts for state and local taxes under Regulations section 1.1446-6(c)(1)(iii). The netting rules under section 1(h) and Notice 97-59 must be considered in determining the category of income the reduction amounts offset.
Further form details
Complete Part VII to determine the amount of the penalty. The penalty is figured for the period of underpayment using the underpayment rate determined under section 6621(a) (2). The period of underpayment runs from the installment due date to the earlier of the date the underpayment is actually paid or the 15th day of the 3rd month after the close of the 2026 tax year (the 15th day of the 6th month if the partnership keeps its books and records outside the United States and Puerto Rico).
The underpayment rate is the federal short-term rate plus 3 percentage points (2% in the case of a corporation). See section 6655 for definitions for underpayment amount and underpayment period. For information on obtaining the federal short-term interest rate on underpayments denoted by an asterisk, see the footnote on page 5 of the schedule.
Note: Generally, the partnership isn’t required to file this Schedule A (see Part I below for exceptions) because the IRS will figure any penalty owed and bill the partnership. However, the partnership may still use this Schedule A to figure the penalty. If so, enter the amount from line 65 of this Schedule A on line 8 of Form 8804, but don’t attach this Schedule A.
Reading the lines and boxes
These selected labels come from the linked target PDF. They are a reading aid, not a replacement for the full line instructions or a completed calculation. Match the label and document version before transferring any amount.
| Line or box | Label in the source form | What to check |
|---|---|---|
| 1 | Enter the total section 1446 tax shown on the partnership’s 2026 Form 8804, line 5f. If less than $500, | Follow the stated arithmetic and line references in sequence. Complete the referenced inputs first and retain the worksheet supporting the result. |
| 2 | Enter the total section 1446 tax that would have been due for 2025, without regard to reductions for | Follow the stated arithmetic and line references in sequence. Complete the referenced inputs first and retain the worksheet supporting the result. |
| 3 | Enter the smaller of line 1 or line 2. If the partnership is required to skip line 2, enter the amount from | Follow the stated arithmetic and line references in sequence. Complete the referenced inputs first and retain the worksheet supporting the result. |
| 4 | Installment due dates. Enter in columns (a) through (d) | Use the date or tax period requested by this particular field. A payment date, acquisition date and return year can describe different facts. |
| 5 | Required installments. If the partnership uses the | Check the applicable line instructions and keep the source workpaper with the return records. Transfer only the information that matches the field and reporting period. |
Further selected fields
| Line or box | Label in the source form | What to check |
|---|---|---|
| 6 | Estimated section 1446 tax paid or credited for each | Reconcile the relevant payment or withholding record with the tax period and category requested here. A reported payment is not necessarily the final tax liability. |
| 7 | Enter amount, if any, from line 13 of the preceding column | Check the applicable line instructions and keep the source workpaper with the return records. Transfer only the information that matches the field and reporting period. |
| 8 | Add lines 6 and 7 | Follow the stated arithmetic and line references in sequence. Complete the referenced inputs first and retain the worksheet supporting the result. |
| 9 | Add amounts on lines 11 and 12 of the preceding column | Check the applicable line instructions and keep the source workpaper with the return records. Transfer only the information that matches the field and reporting period. |
| 10 | Subtract line 9 from line 8. If zero or less, enter -0- | Follow the stated arithmetic and line references in sequence. Complete the referenced inputs first and retain the worksheet supporting the result. |
A practical example
A partnership reviews its annual foreign partner withholding calculation and the dates of estimated payments. The preparer checks whether an underpayment calculation is required and completes the supported method before finishing the annual return.
This example illustrates the order of the review. It does not assume an unverified deduction, exemption, treaty rate or final tax amount. The applicable form instructions and the actual records determine the result.
Common mistakes to avoid with Schedule A Form 8804 2026
- Do not equate a final paid-in-full balance with timely installments.
- Use the calculation method and periods permitted by the instructions.
- Reconcile the schedule with the annual return and payment records.
Questions about Schedule A Form 8804 2026
Does receiving or downloading this form mean I must file it?
A partnership uses the schedule when the estimated section 1446 tax underpayment calculation requires it. The form purpose and the applicable filing or furnishing conditions determine the action. Downloading a blank PDF does not itself create a filing obligation or establish eligibility for a tax benefit.
Can I file the draft PDF?
No. The linked target is marked as a draft. Use it to understand the proposed layout and prepare records, but wait for the applicable final filing version. Check the IRS source again before using any year-specific amount, worksheet or filing instruction.
What should I do if the underlying information is wrong?
Do not equate a final paid-in-full balance with timely installments. Keep the original record and the correction trail. The issuer correction process, an amended return and an updated certificate can be different procedures. Choose the process that matches the document and the actual error.
Which records should I keep with the completed form?
Retain the source documents, applicable worksheets, submitted version and filing or furnishing confirmations. For this form, the working file should include annual withholding tax calculation, installment liability workpapers, payment dates and amounts. Keep continuing balances and prior-year support for as long as they remain relevant under the applicable recordkeeping rules.
Related forms and next steps
Use these guides when the connected issue applies to your records. Each page has its own purpose, reporting year and availability status.