Last reviewed October 7, 2026 · By the NYBACS advisory team
Short answer
Penalties start to accrue, and their size depends on which return was missed. A C-Corp's late Form 1120 is penalized as a percentage of unpaid tax, so a zero-tax year may cost little; a multi-member LLC's late Form 1065 costs a fixed amount per member per month; and a missing Form 5472 carries a $25,000 penalty regardless of tax. Filing quickly, paying any tax and requesting relief where it is available limits the damage.
Key takeaways
- The corporate failure-to-file penalty is 5% of unpaid tax per month, up to 25%, with a minimum of $525 or the tax due (whichever is less) for returns due after 2025 that are more than 60 days late.
- Partnership returns are penalized at $255 per partner per month (returns due after 2025) for up to 12 months, even when no tax is owed.
- A missed Form 5472 is penalized at $25,000 per form, independent of income or tax.
- First-time abatement can remove certain failure-to-file and failure-to-pay penalties for a taxpayer with a clean three-year history.
- Until a required return is filed, the IRS assessment period generally does not start, so the exposure stays open.
The penalty depends on the return you missed
US business penalties are not one-size-fits-all. The same late month produces very different outcomes for different entities:
| Missed filing | How the penalty is calculated | Zero-tax year? |
|---|---|---|
| Form 1120 (C-Corp) | 5% of unpaid tax per month, capped at 25%; minimum penalty after 60 days | Usually little or no failure-to-file penalty, because it is based on tax |
| Form 1065 (multi-member LLC) | Fixed amount × number of partners × months late, up to 12 months | Full penalty applies — partnerships pay no tax |
| Form 5472 (foreign-owned DE or 25% foreign-owned C-Corp) | $25,000 per form, plus continuation penalties after IRS notice | Full penalty applies |
| Form 8804/8805 (partnership withholding) | Percentage-based penalties on unpaid withholding tax, plus information-return penalties | Depends on effectively connected income |
This is why a foreign-owned company that "owed nothing" can still face a large bill: the information-return penalties do not depend on tax.
Interest and failure-to-pay run alongside
Where tax is owed, two further charges apply:
- Failure-to-pay penalty — 0.5% of unpaid tax per month, up to 25%. When both apply in the same month, the failure-to-file penalty is reduced by the failure-to-pay amount.
- Interest — charged on unpaid tax from the original due date until payment, and on many penalties as well. Interest cannot be removed by penalty relief except in limited cases.
Paying the estimated tax as soon as possible, even before the return is ready, stops the failure-to-pay penalty and interest from growing.
A practical catch-up sequence
When one or more years have been missed, the order of work matters:
- Identify every missed return — federal income tax, Form 5472, partnership withholding forms and state filings — for each year.
- Rebuild the books from bank, card and payment-processor statements so each return is based on reconciled numbers.
- Prepare the oldest year first, because opening balances, loss carryforwards and capital accounts flow forward.
- Pay any tax due promptly to stop failure-to-pay penalties and interest.
- File with a clear, accurate explanation where the facts support penalty relief.
- Respond to IRS notices on time, keeping copies of everything sent.
Rushing out an inaccurate return to beat a notice usually creates a second problem — an amended return or an accuracy penalty — so speed should not come at the expense of correctness.
Penalty relief: what is and isn't available
Two main relief routes exist:
- First-time abatement (FTA) is an administrative waiver for failure-to-file (including the partnership late-filing penalty), failure-to-pay and failure-to-deposit penalties, where the same type of return was filed on time for the prior three years without penalties. It is not listed as available for Form 5472 penalties.
- Reasonable cause relief applies where the company exercised ordinary business care but could not file on time — for example, because of serious illness, disaster or reliance on incorrect advice in specific circumstances. It is judged on facts and documentation.
Not knowing about a filing requirement is generally not enough on its own. Whether relief is realistic in a particular case is a question for a qualified tax professional who has reviewed the full history.
Consequences beyond the IRS penalty
Late federal filings ripple outward. Banks and payment processors running periodic KYC reviews may ask for recent returns; investors and acquirers will find gaps in due diligence; an overseas parent's auditor may query unfiled US returns; and the IRS assessment window generally remains open for a year in which a required return — including a Form 5472 — was never filed. States add their own late penalties and can suspend a company's good standing for unfiled state returns. Catching up federally without checking the state side often leaves the more visible problem — a lapsed good standing certificate — unresolved.
Common mistakes to avoid
- Assuming that owing no tax means there is no penalty for filing late.
- Ignoring an IRS notice because it was sent to an old US address or registered agent and never forwarded.
- Filing only the latest year and leaving earlier missed years open.
- Submitting a quick estimate-based return that later has to be amended.
- Requesting first-time abatement for a penalty type it does not cover.
- Forgetting state returns and annual taxes while catching up federal filings.
Documents and records to prepare
- Any IRS or state notices received, with envelopes showing dates
- Bank, card and payment-processor statements for all missed years
- Formation documents, EIN letter and ownership records
- Copies of any returns that were filed and proof of filing
- Records explaining why the deadline was missed (correspondence, medical or disaster evidence) if relief will be requested
NYBACS 360° support
How NYBACS helps
- Builds a year-by-year inventory of every missed federal and state filing for your entity.
- Reconstructs books from bank and processor data so late returns are accurate the first time.
- Coordinates preparation of late returns and penalty-relief requests with licensed tax professionals.
- Tracks IRS and state notices and response deadlines so nothing escalates while the catch-up is underway.
- Puts a compliance calendar in place so the company does not fall behind again.
Frequently Asked Questions
How soon after a missed deadline does the IRS send a notice?
There is no fixed timing; notices can arrive months later. Penalties accrue from the due date regardless of when you hear from the IRS, so waiting for a notice does not reduce the cost.
If I file late, will the penalty be assessed automatically?
Often, yes. Many penalties are computed by IRS systems when the late return is processed. A relief request can be included with the return or made after the penalty notice arrives.
Can the company be dissolved instead of filing the missed returns?
Dissolving the company does not erase past filing obligations. Missed returns generally still need to be filed, and a final return is required in the year of dissolution.
Does a missed federal deadline affect the company's state good standing?
Not directly, but states have their own returns and annual taxes. Companies that miss federal deadlines often miss state ones too, and unpaid state obligations can lead to loss of good standing or administrative dissolution.
Is it better to file all missed years at once?
Usually the years are prepared in order and filed together, so the explanation and any relief requests are consistent. The right approach depends on how many years are involved and whether the IRS has already made contact.
