The topic's "2026 and 2026" wording is ambiguous, so here is how this guide uses the years. The current F-1120 forms and instructions carry a 01/26 revision date and cover tax years beginning on or after January 1, 2025. A return filed in 2026 can therefore report 2025 income, while tax years beginning in 2026 follow some updated rules. Confirm the year on the official Florida Department of Revenue (DOR) form before you file.
Key Takeaways
- Florida F-1120 is a state return, distinct from federal Forms 1120, 1120-S, and 1120-F.
- You may owe a return even when no Florida tax is due.
- A federal extension does not extend Florida time; file Florida Form F-7004.
- An extension gives more time to file, not more time to pay.
- Keep the federal return, schedules, and separate filing and payment confirmations.
What Is Florida Form F-1120 and Who Must File?
What the form reports
F-1120 reports Florida corporate income or franchise tax. It starts with federal taxable income, then applies Florida adjustments, apportionment, the exemption, and credits.
Federal Form 1120-F is the IRS return for foreign corporations, as the IRS guidance explains. The two are unrelated filings with different agencies.
Which entities may need to file
The DOR instructions treat the main entity types this way:
- C corporations: Corporations doing business, earning income, or existing in Florida file.
- Out-of-state corporations: Foreign corporations qualified to do business, or actually doing business, in Florida are covered.
- LLCs taxed as corporations: They file like any other corporation.
- Banks and savings associations: They file when doing business, earning income, or existing in Florida.
- S corporations: Florida taxes IRC 1374 and 1375 amounts (built-in gains and excess passive income). Without that federal liability, file only if you need a refund.
- Tax-exempt organizations: Federal unrelated business taxable income triggers Florida tax and filing.
- Homeowner and condominium associations: Those filing federal Form 1120 must file in Florida even with no tax due. Form 1120-H filers need not.
When a separate F-1120 may not be required
A disregarded single-member LLC files no separate corporate return. Its corporate owner reports the income and files F-1120, even if owning the LLC is its only Florida link.
Partnerships, partnership-taxed LLCs, and sole proprietorships fall outside the corporate definition. A corporate partner or owner may still have its own filing obligation.
"No tax due," "exempt," and "no filing required" are three different conclusions. The $50,000 exemption reduces taxable income; it does not waive the return. Late zero-tax returns can still draw penalties.
F-1120 versus the F-1120A short form
Form F-1120A is available only if all of these are true:
- Florida net income is $45,000 or less (net income, not gross revenue).
- The business is 100% Florida, with no apportionment.
- Federal adjustments are limited to net operating loss and state income taxes.
- The corporation is not in a consolidated return.
- No credits are claimed other than tentative or estimated payments.
- No federal alternative minimum tax applies.
- Calculated tax is under $2,500 (per the current 01/24 form).
Quick checklist before choosing a form:
- Confirm federal classification (C corporation, S corporation, disregarded, partnership).
- Confirm Florida activity and nexus.
- Match the tax year to the federal return.
- Test the short-form conditions above. If any fails, use F-1120.
How to Complete and File Florida Form F-1120
Gather your records first
Assemble these before entering any figures:
- Legal name, FEIN, and Florida account details
- Tax year and accounting period
- The filed federal return (pages 1-6 are attached to F-1120)
- Trial balance, income statement, and balance sheet
- Ownership information and prior Florida returns
- Estimated and extension payment records
- Credit documentation
Reconcile the entity name, FEIN, tax year, and federal classification across all of them first. Mismatches here cause most downstream headaches.
Start with federal taxable income, then adjust
The current form's sequence is:
- Start with federal taxable income.
- Add federally deducted state income taxes, plus other additions.
- Subtract Florida subtractions to reach adjusted federal income.
- Determine the Florida portion.
- Add Florida-allocated nonbusiness income.
- Subtract the exemption, calculate tax, then subtract credits.
- Add penalties and interest, and subtract estimated or tentative payments.
The state-tax addback covers income taxes of all states, including Florida, and DC. Attach state-by-state detail. Gross-receipts taxes and city or county income taxes do not belong on that line. Support every adjustment with workpapers.
Schedules, apportionment, and credits
| Schedule | Purpose |
|---|---|
| I | Additions to federal income |
| II | Subtractions, including Florida carryovers |
| III | Apportionment (standard weights 25% property, 25% payroll, 50% sales) |
| IV | Florida adjustments and loss or contribution carryovers |
| V | Credits against the tax |
| R | Nonbusiness income allocated to Florida or elsewhere |
An all-Florida business skips apportionment. A multistate corporation must document it, and some industries use special sourcing rules.
A July 7, 2026 DOR notice (TIP 26C01-01) adds a wrinkle for years beginning in 2026. Florida adopts the IRC as of January 1, 2026 but keeps the January 1, 2025 versions of sections 168(k), 174(a), 163(j), 274, and 179. Affected taxpayers recompute federal taxable income and attach a pro forma computation plus pages 1-6 of the actual federal return.
Calculating the tax: a hypothetical example
Illustrative only; all figures are invented.
- Federal taxable income: $400,000
- Add federally deducted state income taxes: $10,000
- Adjusted federal income: $410,000 (100% Florida, so no apportionment)
- Less $50,000 exemption: $360,000
- Tax at 5.5%: $19,800
- Less estimated payments of $15,000: $4,800 balance due
Section 220.11 also provides a 3.3% alternative-minimum-tax computation, compared against the standard result for affected taxpayers.
Filing, attachments, and payment records
- Long-form F-1120 is filed through the IRS Modernized e-File (MeF) system using software or transmitters approved by both the IRS and Florida DOR.
- F-1120A, F-7004, and payments can go through the DOR corporate portal.
- Mandatory e-filing and e-payment apply if you paid $5,000 or more in the preceding July-June fiscal year, or federal e-filing is required.
- Payments must be in U.S. funds. Initiate them and receive confirmation by 5 p.m. ET on the business day before the due date.
- Attachments: F-1120 needs the federal return copy (pages 1-6); a missing copy makes the return incomplete. F-1120A does not attach it initially.
Save the accepted-return acknowledgment, payment confirmation, extension confirmation, schedules, federal return, and workpapers together.
For foreign-owned or multistate businesses, reconciling books to the federal return before preparing Florida schedules is often the slowest step. VJM Global provides multistate U.S. tax compliance and accounting support to clients of any nationality, which can help with that reconciliation if you want outside hands on it.
2026 Deadlines, Extensions, Payments, and Tax Calculations
Determining the original deadline
The general due date is the first day of the fifth month after year-end (or the 15th day after the related federal due date, as applicable). Per the DOR, a December 31, 2025 year-end is due May 1, 2026.
Special cases:
- June 30 year-end, year beginning before January 1, 2026: fourth-month rule, with a seven-month extension.
- June 30 year-end, year beginning on or after January 1, 2026: fifth-month rule. June 30, 2027 is due November 1, 2027, extended to May 1, 2028.
- Weekends and holidays: next business day.
Some older guidance describes the fourth-month rule as general. It is not. Check the DOR due-date chart rather than copying dates from prior-year articles.
Extensions and Form F-7004
File Florida Form F-7004 by the original due date, not before year-end. A federal extension alone does not count. The general extension is six months; qualifying June year-ends beginning before 2026 get seven.
You must pay 100% of the tentatively determined tax, after applicable payments and credits, by the original deadline.
The DOR instructions state the extension is void if tentative tax goes unpaid, or if tax is underpaid by the greater of $2,000 or 30% of the tax shown on the filed return. The 90% estimated-tax safe harbor does not apply to F-7004.
Estimated tax and cash-flow planning
- Estimated tax applies when expected annual liability exceeds $2,500, using Form F-1120ES.
- Four 25% installments are normal. For a calendar-year 2026 filer, they fall on June 1, June 30, September 30, and December 31.
- The general pattern is the last day of the 5th, 6th, 9th, and 12th months.
- Estimated payments, extension payments, and credits all reconcile on the final return.
Calculate underpayment on Form F-2220. For foreign-owned or multistate groups, a large payment due in one month often surprises treasury teams, so build these dates into the cash forecast.
Rates, exemptions, interest, and penalties
| Item | 2026 treatment |
|---|---|
| Standard rate | 5.5% |
| Exemption | $50,000 (prorated by days/365 for short years) |
| Late return, tax due | 10% per month or part-month, max 50% |
| Late return, no tax due | $50 per month or part-month, max $300 |
| Incomplete return | Greater of $300 or 10% of final tax, max $10,000 |
| Estimated-tax underpayment | 12% per year on the underpayment |
| Required e-filing not used | 5% of tax due per month, max $250 ($10 if no tax due) |
| Late-payment interest | 11% for calendar 2026 |
The 11% floating interest rate appears in the DOR interest notice. Interest and penalties are different charges: interest accrues on unpaid tax, while penalties attach to the late filing or underpayment itself. Both can apply to the same return.
A practical 2026 filing calendar
- Identify the tax year-end.
- Calculate the original due date (and the e-payment cutoff, the business day before).
- File F-7004 and pay tentative tax by that date if extending.
- Calendar the estimated-tax installments.
- Note the extended deadline.
- Pay any final balance and record every confirmation number.
Recheck the DOR website before filing. Rates, interest, forms, and e-filing rules change.
Common Mistakes and Post-Filing Corrections
Confusing Florida and federal forms
- Filing federal Form 1120-F in place of Florida F-1120
- Assuming a federal extension covers Florida
- Treating a federal filing as proof Florida is done
Missing adjustments, schedules, or attachments
- Copying federal taxable income without Florida additions and subtractions
- Leaving off the federal return attachment
- Using the wrong tax year after an accounting-period change
- Skipping apportionment documentation
- Claiming credits without support
- Name or FEIN mismatches
- Unsigned returns
- Ignoring consolidated-return status
Rejected, late, or incorrect returns
If an e-file is rejected, review these items before resubmitting:
- Rejection code
- Entity information
- Software version
- Authorization details
- Payment record
- Any DOR notice
Florida also requires the federal e-file to be free of validation errors, so clear those first.
To correct a filed return, use Form F-1120X (the original must already be filed). Key points from its instructions:
- File within 60 days after federal taxable-income adjustments are agreed or finally determined, attaching the amended federal return or signed audit evidence.
- Refund claims generally have a three-year limit, with a special two-year limit for federal-audit-based claims. These are not universal deadlines for every amendment.
- If an audit is open, provide the DOR audit identification or service-notification number.
Conclusion
Get the filing obligation right first. Then work through the rest in order:
- Reconcile the federal return to Florida adjustments
- Calculate Florida income
- Meet the extension and payment rules
- Attach the required records
- Keep proof of filing and payment
Corporations with foreign ownership, multistate operations, complex classifications, credits, notices, or uncertain nexus should get professional tax-compliance support before filing or amending.
Frequently Asked Questions
What is the due date for filing a Florida 1120 tax return with an extension?
It depends on the tax year-end. The extension is normally six months from the original due date, for example May 1, 2028 for a June 30, 2027 year-end. It requires a timely Form F-7004 plus payment of tentative tax.
Who must file Florida Form F-1120 in 2026?
Corporations and other entities taxed as corporations that do business, earn income, or exist in Florida generally file. Entity classification, nexus, federal filing status, and special exceptions all need review.
Is Florida Form F-1120 the same as federal Form 1120-F?
No. F-1120 is a Florida DOR corporate income/franchise tax return. Form 1120-F is the IRS income tax return for foreign corporations.
Can an LLC file Florida Form F-1120?
Yes, if it is taxed as a corporation. Disregarded LLCs report through their owner, and partnership-taxed LLCs are analyzed under different rules.
What documents are needed to complete Florida Form F-1120?
You need the federal return (pages 1-6), accounting records, entity and tax-year details, state-tax addback detail, and apportionment data. Payment records, Form F-2220 if applicable, and credit documentation are also required.
Do I need to file Florida Form F-1120 if no tax is due?
Often yes. Zero calculated tax, including after the $50,000 exemption, does not remove a filing obligation, and late zero-tax returns can carry penalties. Verify your status and confirm the return was accepted.
