Form 1066 – REMIC Tax Return – Schedule Q Guide, Deadlines

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A REMIC return usually lands on a preparer's desk once or twice a year, which is exactly why the small things slip. The piece that catches people is the calendar: Form 1066 is due on the 15th day of the third month after year-end, but for a 2025 calendar-year REMIC the statutory March 15, 2026 date falls on a Sunday, so the return is timely if you file by Monday March 16, 2026. That one-day shift has saved more than one late-filing penalty.

The other place returns go sideways is the bridge between the schedules and the body of the return. Taxable income or net loss has to land on Section I, line 15, the four Schedule Q quarters have to reconcile back to it, and foreclosure-property net income gets taxed at 21% on Schedule J, Part II rather than flowing through to holders. Get the OMB number wrong, file to the wrong Ogden address, or miss a Schedule Q delivery date, and the cleanup costs far more than the return ever did.

Key Takeaways

• You file Form 1066 if your entity elected REMIC status and still qualifies, you report income, deductions, gains, and losses, and you compute and pay taxes on prohibited transactions, foreclosure property, and certain contributions after startup day.
• The return is due each year on or around March 15 for calendar‑year REMICs, for example the 2024 return was due Monday March 17, 2025, because March 15, 2025 fell on a Saturday, with a 6‑month extension available on Form 7004 when filed by the original due date. Weekend and holiday rules apply.
• You must prepare and deliver Schedule Q to each residual interest holder by the last day of the month following the quarter’s end, and you attach the original copies to Form 1066. The four quarters must reconcile to Section I, line 15 of Form 1066.
• Mail Form 1066 to the IRS in Ogden, Utah, using the address that applies to your situation, or follow current IRS guidance if your software supports e‑filing.
• The current OMB control number on Form 1066 and Schedule Q is 1545‑0123, confirm this on the PDFs you file.

What Form 1066 Is, in Plain English

Form 1066 is the annual U.S. REMIC income tax return. If you elected REMIC status and still meet the requirements in section 860D, you file Form 1066 each year. The form reports the REMIC’s taxable income or loss and includes schedules that compute any tax due on prohibited transactions, foreclosure property, and contributions after the startup day. Think of it as the REMIC’s backbone return, even though tax on ordinary REMIC income is borne by investors, not the REMIC.

A few definitions matter. A REMIC must have only regular and residual interests, it must follow a calendar tax year, and it must maintain qualified mortgages and permitted investments, generally starting at the close of the third month after the startup day. If you no longer meet these standards, the REMIC election can terminate, and your filing changes.

When You File, Extensions, and the Weekend Rule

Most REMICs are calendar year filers. The due date is the 15th day of the third month following the tax year, which means March 15 for calendar year filers. If March 15 falls on a weekend or legal holiday, your return is timely if it is postmarked by the next business day. If you need more time, file Form 7004 by the original due date for an automatic six‑month extension, for example to September 15 for calendar‑year returns. The extension gives you more time to file, not more time to pay any tax due.

For 2024 calendar‑year REMICs, March 15, 2025 fell on a Saturday, so the due date shifted to Monday March 17, 2025. The same pattern applies each year, check the calendar and apply the weekend rule. I recommend setting calendar holds one week before the date you expect to file or extend.

Schedule Q, What It Does and When It Is Due

Schedule Q is the quarterly notice that tells each residual interest holder the share of REMIC taxable income or net loss for that quarter, the excess inclusion under section 860E, and that holder’s share of section 212 expenses. You must complete a Schedule Q for each person who held a residual interest at any time during the quarter, send a copy to the holder by the last day of the month after the quarter ends, and keep a copy with your records. The original Schedule Qs for all four quarters are attached to the annual Form 1066.

Two reconciliation points keep you out of trouble. First, the total for line 1a across the four quarters must match Form 1066, Section I, line 15. Second, for each holder, confirm the math for daily portions and ownership changes during the quarter. I build a small tie‑out tab in the workpapers so reviewers can see the bridge in seconds.

Where and How You File

Unless IRS updates say otherwise, mail the return to Ogden, Utah. If the REMIC’s principal place of business is in the United States, use Department of the Treasury, Internal Revenue Service, Ogden, UT 84201‑0007. If outside the United States or in a U.S. territory, use Internal Revenue Service, P.O. Box 409101, Ogden, UT 84409. Some software may offer e‑file for 1066, however always check the current IRS page for Form 1066 for the latest availability and instructions.

I also recommend paying any tax via EFTPS on or before the due date for payments, which is the 15th day of the third month after year‑end. Keep confirmation numbers with your return copy.

How To Prepare Form 1066 Without Fire Drills

Prep the Source File

• Gather the trust or pooling and servicing agreement, trustee or servicer reports, cash flow statements, and any offering materials that describe residual and regular interests.
• Confirm the EIN, startup day, and calendar‑year status, and update addresses with Form 8822‑B if needed.

Build Standard Workpapers

• Create a tie‑out from trustee or servicer reports to Section I lines for income and deductions.
• Track interest accruals to regular interest holders and other interest separately, because they map to different deduction lines.
• Maintain a quarterly subledger that feeds each Schedule Q, then roll the four quarters to Form 1066, Section I, line 15.

Complete Section I, Income and Deductions

• Record taxable interest, accrued market discount, ordinary gains or losses, and other income per the instructions, then compute total income.
• Enter deductions including amounts accrued to regular interest holders, depreciation if applicable, and other deductible expenses allowed to REMICs.
• The result is taxable income or net loss on line 15, which must tie to Schedule M and your Schedule Q roll‑up.

Compute Taxes Where Applicable

• Use Schedule J to calculate tax on prohibited transactions, net income from foreclosure property at 21 percent, and contributions after the startup day (Part III of Schedule J applies only to REMICs whose startup day was on or after July 1, 1987 – pre-July 1, 1987 REMICs are statutorily exempt and skip Part III), then total tax on line 12.
• Enter tax paid with Form 7004, and reconcile to tax due or overpayment in Section II. Keep EFTPS confirmations.

Assemble, Sign, and File

• Assemble the return with required schedules, include original Schedule Q copies for all quarters, and complete the paid preparer authorization if you want the IRS to contact your preparer.
• Sign the return, check the address, and mail or e‑file per current IRS guidance.

Schedule Q, Step‑By‑Step

Identify Residual Interest Holders

• For each quarter, list every person who held a residual interest at any time during that quarter, gather identifying numbers, and confirm entity type.
• Track ownership changes inside the quarter, because daily portions under section 860C and accruals under section 860E depend on days held.

Fill Out Key Lines

• Line 1a, the REMIC’s taxable income or loss for the quarter.
• Line 1b, each holder’s share based on daily portions for the days they held the interest (the holder must include this share in income whether or not the REMIC actually distributed cash – phantom income is a known feature of REMIC residuals).
• Line 2a and 2b, excess inclusion mechanics under section 860E, then compute line 2c for the holder. Note that line 2c is the statutory floor on the holder’s taxable income (and AMTI if applicable) for the year – it cannot be offset by NOLs, business losses, or other deductions, except for narrow financial-institution relief.
• If required, report section 212 expenses and the holder’s share on line 3. For individuals, section 212 expenses are not deductible as miscellaneous itemized deductions for tax years 2018 through 2025, so they are picked up as income.

Deliver and Attach

• Deliver a copy of Schedule Q to each residual interest holder by the last day of the month following the quarter end, for example, deliver Q1 notices by April 30.
• Attach the original Schedules Q for all quarters to the annual Form 1066, and retain copies with your records.

Penalties, Extensions, and Payments

Late happens, however know the stakes. If the return is 60 or more days late, the minimum failure‑to‑file penalty is the smaller of the tax due or 525. If no tax is due, the IRS may charge a section 6698 penalty of 255 per residual interest holder per month, up to 12 months. The failure‑to‑pay penalty is generally 0.5 percent per month, capped at 25 percent, unless you show reasonable cause. File Form 7004 by the original due date to secure a six‑month automatic extension to file. It does not extend time to pay.

For timeliness, the weekend and legal holiday rule protects you when you mail by the next business day. Keep proof of mailing or private delivery service tracking. When in doubt, build a one‑day buffer into your calendar.

Addresses, E‑Signatures, and Practical Filing Notes

Mail U.S. based REMIC returns to Department of the Treasury, Internal Revenue Service, Ogden, UT 84201‑0007, and foreign or U.S. territory filers to Internal Revenue Service, P.O. Box 409101, Ogden, UT 84409. Confirm addresses on the current instructions at filing time. Some 1066 returns may flow through IRS processing systems that recognize electronic filings, however availability depends on software and IRS program updates, so always check the current IRS Form 1066 page before you plan to e‑file.

Pro tip, verify the OMB control number on the PDF you are filing. For 2024 Form 1066 and Schedule Q, the OMB number is 1545‑0123, shown on the forms themselves. This is an easy quality check that your package is current.

Wow Factors, Reviewer Shortcuts, and a Ready‑To‑Use Checklist

Reviewer Shortcuts I Use

• Quarter‑to‑annual bridge, a single tab that adds the four Schedule Q, line 1a amounts and ties them to Section I, line 15.
• Residual holder roll, a grid that shows daily portions for each holder and each quarter, with ownership change dates highlighted.
• Section 212 impact, a quick calc that shows individuals how line 3b will be reported as income, not a deduction, for 2018 through 2025.

REMIC Filing Checklist

• Confirm REMIC status, election still in effect, and calendar tax year.
• Pull trustee and servicer reports, tie to income and deduction lines.
• Complete Section I, compute line 15, and populate Schedule M.
• Use Schedule J to compute any prohibited transaction tax, foreclosure property tax at 21 percent, and tax on contributions after startup day.
• Prepare four Schedule Qs, one per quarter, deliver to holders by the last day of the month after each quarter, and attach originals to Form 1066.
• Assemble, sign, calendar the due date, and if needed file Form 7004 by the original due date for a six‑month extension.
• Mail to the correct Ogden address, keep proof of timely mailing, and save EFTPS confirmations for any tax due.

Quick Reference Table

Item	What you do	Where it shows
Annual due date	File by the 15th day of the third month, for calendar year filers this is March 15	Instructions, When To File
Extension	File Form 7004 by the original due date, six‑month extension to file, not to pay	Form 7004 instructions
Schedule Q delivery	Send to each residual interest holder by last day of month after quarter end, attach originals to Form 1066	Schedule Q instructions
Where to file	Ogden, UT 84201‑0007, or P.O. Box 409101 Ogden, UT 84409 for foreign or territory	Instructions, Where To File
OMB control number	Confirm 1545‑0123 on current PDFs for 1066 and Schedule Q	Form PDFs

Light Touch, Serious Control

If you are buried in quarter‑end and year‑end workloads, this is where a disciplined team helps. At Accountably, we plug into your templates and systems, prepare Form 1066, produce Schedule Qs on a reliable calendar, and build the tie‑outs reviewers love. We keep mentions of tools minimal and the workpapers clean, which means fewer review cycles and predictable delivery when your partners need it most.

Author, Date, and Note

• Written by our tax operations team, reviewed on December 2, 2025.
• This guide is educational, it is not tax advice. Always confirm your facts against the current IRS instructions and your counsel. For the latest, check the IRS Form 1066 page and instructions before you file.

Common Mistakes We See Every Season

Most Form 1066 mistakes do not show up in the totals – they show up in the reconciliation. Here are the recurring ones we catch in review every season, with the SOP fix beside each.

Reusable Checklists

These checklists are copy-paste ready for firm SOP libraries. We update them each season against the IRS Form 1066 (2025) instructions and Rev. Proc. 2024-40 for current penalty thresholds.

Keep 1066 Season From Stalling

Form 1066 looks niche on the calendar – one return per REMIC, calendar-year deadline of March 15 – but it lands in the middle of the busiest C-corp and partnership filing window. A team running a stack of 1065s and 1120s is the same team being asked to prepare four Schedule Qs per REMIC, tie quarter-to-annual totals, and confirm the right Ogden address before the postmark cutoff. The minimum failure-to-file penalty for 2026 filings more than 60 days late is the lesser of $525 or 100% of the tax shown on the return (per Rev. Proc. 2024-40), and tax paid with Form 7004 has to post by the original due date or interest and the failure-to-pay penalty accrue from that date.

The fix is structural. Standardize what every REMIC's Schedule Q packet looks like across the book, so reviewers can run the same tie-outs each quarter without relearning the file.

• Build a residual-holder ownership ledger keyed to dates so Schedule Q line 1b daily-portion math is automatic, not recomputed each quarter.
• Maintain a quarter-to-annual bridge tab that sums the four Schedule Q line 1a values and ties them back to Form 1066 Section I, line 15 before any reviewer signs off.
• Set a recurring calendar trigger at each quarter-end plus 25 days so Schedule Q copies always ship to residual holders by the last day of the following month.
• Pre-populate Schedule J Part II at the 21% foreclosure-property rate and lock Part III as not applicable for any REMIC whose startup day was before July 1, 1987.
• Run the Section II reconciliation – tax due on line 3 versus overpayment on line 4a – with the EFTPS confirmation already attached, before Form 7004 is ever considered.

A disciplined offshore team plugged into your templates handles the repetition – the daily portions, the quarterly Schedule Q runs, the Ogden routing checks – so partners review and sign rather than firefight. That is what our tax delivery practice is built to do.

FAQs

Who must file Form 1066 each year?

You file Form 1066 if the entity elected REMIC status for its first tax year and still meets section 860D requirements. The REMIC uses Form 1066 to report income, deductions, gains, and losses, and to compute taxes on prohibited transactions, foreclosure property, and certain contributions.

What is the due date for a calendar‑year REMIC?

It is the 15th day of the third month after year end, which is March 15 in most years. If the date falls on a weekend or legal holiday, mailing by the next business day is timely. An automatic six‑month extension is available by filing Form 7004 by the original due date (Form 7004 extends only the time to file, not the time to pay – the full estimated tax is still due on the original date or interest and penalties accrue from that date).

When are Schedule Q notices due to holders?

For each quarter, send the notice by the last day of the month after the quarter ends, then attach the originals for all quarters to the annual Form 1066. Reconcile the four quarters to Section I, line 15 before you file.

Can I amend a REMIC return?

Yes. If you discover changes after filing, the IRS instructions direct REMICs to file Form 1065‑X and to issue amended Schedule Qs to residual interest holders, checking the amended box. Route amended packages to the Ogden Accounts Management team per IRS processing guidance.

What penalties apply if I file late?

If the return is 60 or more days late, the minimum failure‑to‑file penalty is the smaller of the tax due or 525. If no tax is due, the IRS may assess a section 6698 penalty of 255 per residual interest holder per month, up to 12 months. A failure‑to‑pay penalty is generally 0.5 percent per month, capped at 25 percent, unless you show reasonable cause.