California Tax Year 2026

California 1099-INT Filing Requirements, Tax Year 2026

What California requires from businesses filing 1099-INT (Interest income) for tax year 2026: deadline, accepted format, CF/SF treatment, registration, and penalties, backed by primary-source citations.

Tax Year 2026 Federal filing satisfies this state Last verified April 26, 2026
Filing method CF/SF satisfies IRS CF/SF submission covers California.
Deadline Federal e-file deadline See deadlines section for holiday rollover. See deadlines
Format accepted Not applicable Federal CF/SF filing covers this state. See format
Late-filing penalty California assesses a per-return penalty under R&TC 19183 for failure to file correct information returns. See penalties

Filing requirements

Federal filing through the IRS Combined Federal/State Filing (CF/SF) Program satisfies California's 1099-INT reporting requirement for tax year 2026. No separate state submission is required when the IRS forwards the record to California under CF/SF.

California is a CF/SF participant. If you e-file 1099-INT with the IRS following Publication 1220 and the federal and California amounts are identical, the IRS forwards the data and no separate California filing is required. Direct filing via SWIFT is only required for state-only differences or paper IRS filings.

Conditional rules

Specific scenarios that change the baseline requirement above:

ConditionExplanation
Direct filing required when federal and California amounts differ

If you have an exception that requires you to report something different for federal and state purposes (for example, a different dollar amount), file separate returns with the IRS and FTB via SWIFT.

Deadlines and extensions

Filing deadline
Federal e-file deadline
Holiday/weekend rollover. If the deadline falls on a weekend or a federal holiday, the next business day generally applies. Check with California for the exact observed calendar before filing.

Accepted format

Federal filing through the IRS Combined Federal/State Filing Program satisfies California's 1099-INT requirement. No separate state submission is required, so there is no state-specific file format to conform to. The IRS transmits 1099-INT records to California automatically after accepting the CF/SF submission.

Registration

Registration required: Yes

Direct filers must request a SWIFT account by emailing [email protected] with business name, address, FEIN, and primary/technical contact info. FTB responds within 24-48 hours. One SWIFT account may transmit on behalf of multiple entities.

Late-filing penalties

California penalty overview

California assesses a per-return penalty under R&TC 19183 for failure to file correct information returns. Per FTB Pub. 1024 (revised 1/2026): $130 per failure (max $2,010,000/year), reduced to $40 if corrected within 30 days, or $80 if corrected on or before August 1. Higher penalties apply for intentional disregard. Reasonable-cause defense available.

Frequently asked questions

Does California require filing of 1099-INT for tax year 2026?

California accepts 1099-INT through the IRS Combined Federal/State Filing Program, so a separate state submission is generally not required when you file federally under CF/SF.

Does California participate in the CF/SF program?

Yes. California participates in the IRS Combined Federal/State Filing Program and accepts CF/SF submissions from the IRS for most 1099 form types.

What is the California 1099-INT filing deadline for tax year 2026?

The filing deadline is Federal e-file deadline. If the date falls on a weekend or federal holiday, the next business day generally applies.

What format does California accept for 1099-INT?

Because CF/SF filing satisfies California, the IRS's standard electronic submission (FIRE/IRIS) is the operative format; no state-specific upload is required.

Do I need to file 1099-INT with California if I also filed federally?

Generally no. Federal filing through CF/SF satisfies California's 1099-INT requirement, so a separate state filing is typically not needed.

What happens if I miss the California 1099-INT deadline?

California assesses a per-return penalty under R&TC 19183 for failure to file correct information returns. See the full penalty details below for the complete schedule.

How do I register to file with California?

Direct filers must request a SWIFT account by emailing IRPhelp@ftb. See the registration section above for the full requirements.

Source citations

Verified from 4 primary sources
“If you file via paper or file electronically with the IRS following the IRS Combined Federal/State Filing Program... do not file with us. Your information will be forwarded to us from the IRS.”
Apr 23, 2026 https://www.ftb.ca.gov/file/business/information-returns.html
“1099-INT Interest Income Interest income. $10 or more ($600 or more in some cases) 2/28 3/31 1/31”
Apr 25, 2026 https://www.ftb.ca.gov/file/guide-to-information-returns-filed-with-california.html
“Produce the information return as a fixed- length text file format (.txt or .zip of a .txt file) as listed in IRS Publication 1220(external link). Pdf files converted to .txt format will not be processed.”
Apr 25, 2026 https://www.ftb.ca.gov/file/business/information-returns.html
Conditional: Direct filing required when federal and California amounts differ
“If you have an exception that requires you to report something different for federal and state purposes, such as a different dollar amount, file separate returns with IRS and us.”
Apr 25, 2026 https://www.ftb.ca.gov/file/business/information-returns.html

Additional notes

California participates in the IRS Combined Federal/State Filing (CF/SF) Program. If you e-file 1099s with the IRS following IRS Publication 1220 and the amounts you report federally and to California are identical, you do not need to file separately with the Franchise Tax Board (FTB) - the IRS forwards the data via FIRE or IRIS. Direct filers (and any payer with a state-only difference) submit fixed-length .txt files via FTB's SWIFT system. The general 1099 due date with FTB is March 31 for electronic filings (February 28 on paper); FTB allows a 30-day extension via Form FTB 6274A.

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