How to Fill Out Texas Form 424 (w/Examples) + FAQs

Texas Form 424, the Certificate of Amendment, is the official document a domestic filing entity uses to change something inside its Certificate of Formation on file with the Texas Secretary of State. Any Texas for-profit corporation, professional corporation, nonprofit corporation, limited liability company, professional limited liability company, limited partnership, professional association, or cooperative association that needs to change its legal name, registered agent setup, share structure, management structure, purpose, or duration files this form under Texas Business Organizations Code Chapter 3, Subchapter B.

Filing the wrong form, or filing Form 424 when a different form is the correct tool, slows your amendment by weeks and can expose your entity to franchise tax forfeiture if the amendment was tied to a compliance fix. The Texas Secretary of State processes well over 100,000 business filings each fiscal year, and rejection rates climb sharply when filers skip the entity-type box, write vague amendment language, or forget the effectiveness section.

Here is what you will learn in this guide:

  • 📋 What Texas Form 424 is, who must file it, and the exact statutes that control it
  • 🧾 A line-by-line walkthrough of every Article on the form, with sample entries
  • 👥 Three full filled-out examples following Maria, Carlos, and Janet through the form
  • 💸 Filing fees, channels, processing times, and proof-of-filing for each method
  • ⚠️ The most common mistakes filers make, the consequences, and how to avoid them

What the Form Is and Who Must File It

Texas Form 424 is the statutory vehicle for amending a domestic filing entity’s public organizing document. The form lives on the Secretary of State forms page and is governed by BOC §§ 3.051–3.060, which spell out who may amend, what may be amended, and when the amendment becomes effective. The form is not used for foreign entities; foreign filers use Form 406 for amendments to their registration.

Every domestic filing entity organized in Texas must use Form 424 when it wants to change a fact stated in its original Certificate of Formation. That includes for-profit corporations under BOC Chapter 21, nonprofit corporations under Chapter 22, LLCs under Chapter 101, limited partnerships under Chapter 153, professional entities under Chapter 301, and cooperative associations. A sole proprietor or general partnership does not file Form 424 because those entities never filed an original certificate to begin with.

Form 424 is not the right form for every change. A change of registered agent or registered office only is filed on Form 401, which is free, while Form 424 carries a $150 fee for most for-profit entities. A typo or inaccuracy in a previously filed document is corrected on Form 403, Certificate of Correction, not Form 424. A merger uses Form 621, and a conversion uses Form 631.

The Secretary of State accepts Form 424 only when the entity is in active status with the Texas Comptroller and not under tax forfeiture. If your franchise tax account is forfeited, the SOS will reject the amendment until you obtain a Tax Clearance Letter or reinstate the entity using Form 801. This linkage between SOS amendments and Comptroller status is the single biggest source of unexpected rejections.

Before You Start: Documents and Information You Need

Gather everything below before you open the PDF. The form looks short, but each blank reaches into other records, and missing data is the top cause of last-minute filing failures. The current revision date is printed in the lower-left corner of the official PDF; confirm you are on the latest version before typing anything.

  • Exact legal entity name as currently on file. Pull it from your most recent SOS filing or a SOSDirect entity search; one missing comma will cause rejection.
  • Texas SOS file number. A 10-digit number assigned at formation. Without it, the SOS clerk has to search by name and may match the wrong entity.
  • Date of original formation. Used to confirm identity if the file number is wrong.
  • Current registered agent name and registered office address. Needed only if you are amending those, but useful as a cross-check.
  • The exact text of the Article you are changing. You must quote it or restate it as amended, not paraphrase.
  • Board, member, or partner approval documentation. Minutes, written consents, or partnership agreements showing the amendment was authorized under BOC § 3.052.
  • The desired effective date. Immediate, delayed up to 90 days, or condition-based.
  • Payment method. Credit card, LegalEase debit account, check, or money order payable to Secretary of State.
  • Authorized signer’s full legal name and title. Officer, manager, member, general partner, or attorney-in-fact under power of attorney.
  • Tax clearance status. Confirm the entity is in good standing with the Comptroller before filing.

If even one of these is missing, the amendment will sit in your draft folder, miss the effective date you wanted, and may force you to re-record corporate governance documents.

Where to Get the Form and How to Access It

The official Form 424 PDF is hosted on the Texas Secretary of State BOC forms page. Always download a fresh copy each time you file, because the SOS quietly updates the revision footer when fees or statutes change. Third-party sites sometimes host outdated versions, and a stale form with an obsolete fee schedule will be rejected at intake.

You can complete Form 424 in three ways. The first is to download the fillable PDF, type directly into it, print, and sign in ink. The second is to print a blank copy and complete it by hand in black ink only; blue and pencil are both rejection grounds. The third, and fastest, is to log into SOSDirect and prepare the amendment online, where the system pre-fills the entity name, file number, and current registered agent.

SOSDirect requires a free account and a credit card or LegalEase debit account on file. The portal walks you through the same Articles that appear on the paper form, but it blocks some common mistakes by validating fields in real time. For a single-shot filer, the paper PDF is fine; for repeat filers like paralegals and registered agents, SOSDirect saves hours per filing.

If you cannot access the internet, you may request a paper copy by calling the SOS Corporations Section at (512) 463-5555 or by visiting the James Earl Rudder Office Building at 1019 Brazos Street in Austin. A mailed paper copy typically arrives in five to seven business days, which can blow a tight amendment deadline if you wait until the last minute.

Step-by-Step: How to Fill Out Form 424 Line by Line

The form is organized into a heading block, six numbered Articles, an effectiveness section, and an execution block. Each Article must be completed in order, and skipping an Article is not allowed even if it does not apply; the SOS expects you to write Not Applicable rather than leave it blank.

Entity Information Block (Top of Page 1)

Entity Name

This field asks for the exact legal name of your entity as it currently appears on file with the Secretary of State, before any amendment. Type or print the name in capital letters exactly as it shows on your last accepted filing, including punctuation, the entity-type designator, and any commas. For example, MARIA LOPEZ CONSULTING, L.L.C. writes her name with the periods because that is how her Certificate of Formation reads.

If the entity name has special characters like an ampersand or a Roman numeral, copy them character-for-character from your formation certificate. The most common mistake here is writing the new name instead of the current name; the new name belongs in Article 1, not the heading. The direct consequence is rejection with a Notice of Defect, which costs you the filing date and may push the amendment past a closing or board deadline. A common misconception is that “close enough” works; the SOS uses an exact-match algorithm and will not approve a filing where the heading name differs from the indexed name even by one space.

File Number

This field asks for the 10-digit file number the SOS assigned when your entity was first formed. Find it on your stamped Certificate of Formation or by running a free SOSDirect search and copying the number printed next to your entity. Write it without dashes or spaces. For instance, 0801234567 is a typical LLC file number.

What if you genuinely cannot find your file number? Leave the box blank rather than guessing, because a wrong number will route the amendment to a different entity’s record, and unwinding that mistake takes weeks. Filers often confuse the file number with the EIN; the SOS file number has nothing to do with the IRS taxpayer identification number, and writing the EIN here will guarantee rejection.

Article 1 — Amended Name (If Applicable)

This Article asks whether the entity is changing its legal name, and if so, what the new name is. Check the box only if the entity name itself is changing, then write the new name on the line provided, including the proper entity designator such as L.L.C., Inc., L.P., or PLLC. PEACH STATE LOGISTICS, INC. would write its new name as PEACH STATE FREIGHT, INC. on this line.

The new name must be distinguishable in the SOS records under BOC § 5.053. Run a name availability search before filing, or call the SOS name-availability line; if the name is too similar to an existing entity, the amendment will be rejected even if the rest of the form is perfect. The most common mistake is dropping the entity designator, which automatically voids the name change. Filers also wrongly assume that reserving a name through Form 501 protects them after filing; the reservation expires on filing, and the new name must clear the distinguishability test on its own.

Article 2 — Registered Agent and Registered Office (If Applicable)

This Article is used only when the amendment changes the registered agent, the registered office address, or both. If you are only changing the agent or office and nothing else, file the free Form 401 instead. Within Article 2, choose box A for an organization serving as agent, or box B for an individual serving as agent, and supply the agent’s name and the Texas street address of the registered office. JANET KIM at 2400 RIO GRANDE ST, AUSTIN, TX 78705 is a complete entry.

A P.O. Box is never acceptable as a registered office under BOC § 5.201; it must be a physical Texas street address where process can be served during business hours. The agent must have consented in writing under BOC § 5.2011, and while you do not file the consent with Form 424, you must keep it in your records. The most common mistake is using a UPS Store box; the SOS cross-checks against the USPS commercial mail receiving agency list and rejects those addresses. A widespread misconception is that the registered agent must be the owner; any qualifying Texas resident or registered organization can serve.

Article 3 — Specific Amendments to the Certificate of Formation

This is the workhorse Article. Here, you describe each change to the Certificate of Formation that is not a name, agent, or office change, by either restating the amended text in full or by clearly identifying the Article being amended and giving the new wording. Use the exact form language: “Article ___ of the Certificate of Formation is amended to read in its entirety as follows:” and then quote the new text. Article 6 is amended to read in its entirety as follows: The total number of shares the corporation is authorized to issue is 1,000,000 shares of common stock, par value $0.01 per share is a clean entry.

If the amendment adds a new Article that did not exist before, label it as “A new Article ___ is added to read in its entirety as follows:” If the amendment deletes an Article, write “Article ___ is deleted in its entirety.” The single biggest mistake here is paraphrasing instead of quoting, because the SOS will not interpret narrative descriptions; an amendment that says “increase authorized shares to one million” without the formal restatement language will be rejected as ambiguous. A common misconception is that you must restate the entire Certificate of Formation; only the changed Article must be restated, unless you are filing a Restated Certificate on Form 414.

Article 4 — Statement of Approval

This Article asks you to confirm that the amendment was approved in the manner required by the Texas Business Organizations Code for your entity type. The form provides pre-printed language; you simply confirm it applies. For corporations, approval requires board action plus a shareholder vote under BOC § 21.364; for LLCs, approval follows the company agreement or the default rules in BOC Chapter 101.

Carlos Reyes, the sole member-manager of RIO GRANDE ROOFING, LLC, simply signs a written consent of the sole member because his company agreement allows it; he does not need a meeting. The most common mistake is signing Form 424 before the internal approval is documented, which makes the certification false and exposes the signer to liability under BOC § 4.007 for filing a false instrument. A frequent misconception is that the amendment is approved when it is filed; in reality it must be approved before it is filed, and the filing only makes the change public.

Article 5 — Effectiveness of Filing

This Article controls when the amendment legally takes effect, and you must pick exactly one of three options: A, B, or C. Option A makes the amendment effective when the SOS accepts the filing. Option B makes it effective on a later date and time you specify, no more than 90 days out. Option C makes it effective on the occurrence of a future event or fact, which you must describe with the date by which the event must occur.

Maria Lopez selects Option A because she wants her LLC name change to take effect the moment the SOS stamps it. A real estate closing might use Option B with the entry June 30, 2026 at 11:59 PM so the new name aligns with a deed recording. The most common mistake is checking two boxes, which voids the entire effectiveness section and forces the SOS to default to Option A; a related mistake is leaving Option B blank when checked, which is also a rejection ground. Many filers think they can backdate the effectiveness; you cannot, and trying to do so is a misdemeanor under BOC § 4.008.

Execution Block — Signature, Printed Name, and Title

The execution block is where an authorized person signs the form under penalty of perjury, certifying that the statements in the document are true and correct. Sign in black ink on a paper filing, or apply a typed signature on SOSDirect; the typed name on SOSDirect is treated as a digital signature under BOC § 4.001. Print the signer’s full legal name and title, such as Maria Lopez, Manager or Carlos Reyes, Sole Member.

The signer must be a person authorized by the entity: an officer for a corporation, a manager or member for an LLC, a general partner for an LP. The most common mistake is having a non-authorized employee sign because the boss is out of town; that signature is invalid and the filing is void. A widespread misconception is that the signature must be notarized; Texas does not require notarization for Form 424, and adding a notary block does not strengthen the filing.

Three Filled-Out Examples Using Real Scenarios

The three examples below follow three different filers through the entire form, showing what each one writes in each Article. Each filer represents the most common Form 424 use case for that entity type, drawn from frequently asked questions on the SOS FAQ page.

Example 1 — Maria Lopez, LLC Name Change

Maria owns MARIA LOPEZ CONSULTING, L.L.C. and is rebranding to LONE STAR ANALYTICS, L.L.C. She has confirmed the new name is available and obtained sole-member written consent.

Form Section What Maria Enters
Entity Name MARIA LOPEZ CONSULTING, L.L.C.
File Number 0801234567
Article 1 — New Name Box checked; LONE STAR ANALYTICS, L.L.C.
Article 2 — Agent/Office Left blank, no change
Article 3 — Other Amendments Not Applicable
Article 4 — Approval Pre-printed language affirmed
Article 5 — Effectiveness Option A — effective on filing
Execution — Signature Maria Lopez, Sole Member-Manager
Fee $150 by credit card on SOSDirect
Filing Channel SOSDirect online

Example 2 — Carlos Reyes, For-Profit Corporation Increases Authorized Shares

Carlos is president of RIO GRANDE ROOFING, INC., a Texas for-profit corporation. The board and shareholders approved an increase in authorized common stock from 100,000 shares to 1,000,000 shares.

Form Section What Carlos Enters
Entity Name RIO GRANDE ROOFING, INC.
File Number 0809876543
Article 1 — New Name Left blank, no name change
Article 2 — Agent/Office Left blank, no change
Article 3 — Other Amendments Article 6 is amended to read in its entirety as follows: The corporation is authorized to issue 1,000,000 shares of common stock, par value $0.01 per share.
Article 4 — Approval Affirmed; board and shareholder votes documented
Article 5 — Effectiveness Option B — July 1, 2026 at 12:01 AM
Execution — Signature Carlos Reyes, President
Fee $150 plus $25 expedite by check
Filing Channel Mail with expedite request

Example 3 — Janet Kim, Nonprofit Corporation Changes Purpose and Agent

Janet chairs the board of AUSTIN YOUTH ARTS, INC., a Texas nonprofit. The board voted to broaden the charitable purpose and to switch registered agents from a commercial service to Janet personally.

Form Section What Janet Enters
Entity Name AUSTIN YOUTH ARTS, INC.
File Number 0802468013
Article 1 — New Name Left blank, no name change
Article 2 — Agent/Office Box B checked; Janet Kim, 2400 Rio Grande St, Austin, TX 78705
Article 3 — Other Amendments Article 4 is amended to read in its entirety as follows: The corporation is organized exclusively for charitable and educational purposes within the meaning of Section 501(c)(3) of the Internal Revenue Code, including youth arts education and community arts programming.
Article 4 — Approval Affirmed; board minutes dated May 10, 2026
Article 5 — Effectiveness Option A — effective on filing
Execution — Signature Janet Kim, Board Chair
Fee $25 nonprofit fee by check
Filing Channel Mail to PO Box 13697, Austin

How to File the Completed Form

The Secretary of State accepts Form 424 through four channels, and each has its own address, fee structure, payment rules, processing time, and proof-of-filing. Pick the channel that matches your deadline and budget, and always keep the proof-of-filing for at least seven years to satisfy the BOC § 3.151 record-retention rule.

Online via SOSDirect. File at direct.sos.state.tx.us. The fee is $150 for most for-profit entities and $25 for nonprofits and cooperatives, payable by credit card with a 2.7% convenience charge or by LegalEase debit. Processing is typically same-day to two business days. Proof-of-filing is the file-stamped PDF the system emails you within minutes of acceptance.

By mail. Send the original signed form, plus one copy if you want a stamped return, to Secretary of State, P.O. Box 13697, Austin, TX 78711-3697. Pay by check or money order payable to Secretary of State. Standard mail processing runs three to five business days from receipt; add the optional $25 expedite fee for next-business-day handling. Proof-of-filing is the file-stamped copy returned to your self-addressed envelope.

In person. Walk the form into the James Earl Rudder Office Building, 1019 Brazos St, Austin, TX 78701. Cash, check, money order, and most credit cards are accepted at the counter. Counter filings are processed the same day. Proof-of-filing is a stamped duplicate handed back at the window.

By fax. Fax the form to (512) 463-5709 with a Form 807 payment cover sheet authorizing a credit card or LegalEase debit. Fax filings are processed in the same queue as mailed filings, plus the expedite option. Proof-of-filing is mailed back, so request an email return if your matter is time-sensitive.

What Happens After You File

Once the SOS accepts Form 424, the amendment is indexed against your file number and the new facts become part of the public record at SOSDirect. If you elected Option A, the change is effective immediately; if Option B, it sits “filed but not yet effective” until the date and time you chose. Anyone running a search after that point sees the amended record.

Within roughly 10 business days, the file-stamped Certificate of Filing is delivered by your chosen channel. Keep it with your corporate book, your bank, your CPA, and any licensing agencies that rely on the entity’s name or structure. If your bank account, EIN paperwork with the IRS, DBA registrations with the county, sales tax permit with the Texas Comptroller, or professional license needs to match, update each one separately because the SOS does not notify other agencies on your behalf.

If the SOS rejects the filing, you receive a Notice of Defect explaining what to fix. You then have 30 days to correct and resubmit without losing the original filing date under BOC § 4.054. Miss the 30-day window, and you must start over with a new filing date, which can ripple into franchise tax cycles and contract effective dates.

Mistakes to Avoid When Filling Out the Form

Form 424 looks simple, but each Article hides traps. The list below covers the errors that account for most rejections and post-filing headaches.

  • Writing the new name in the heading instead of the current name causes immediate rejection.
  • Using the EIN where the SOS file number belongs routes the filing to nowhere.
  • Listing a P.O. Box as the registered office voids Article 2.
  • Paraphrasing the amended Article instead of quoting it forces the SOS to reject for ambiguity.
  • Checking more than one box in Article 5 voids the effectiveness section.
  • Backdating the effective date is a Class A misdemeanor under BOC § 4.008.
  • Letting an unauthorized employee sign creates a void filing with no legal effect.
  • Filing while in franchise tax forfeiture triggers automatic rejection.
  • Forgetting the entity designator in the new name kills the name change.
  • Skipping a Notice of Defect deadline forfeits your filing date.
  • Submitting in pencil or blue ink on paper draws an instant rejection.
  • Underpaying the fee, including missing the expedite add-on, halts processing.
  • Leaving Article 3 blank instead of writing Not Applicable delays review.
  • Using an outdated PDF with the old fee schedule causes payment mismatch rejection.

Dos and Don’ts

The dos and don’ts below distill 30 years of filer experience with Form 424 into quick rules. Each is anchored to a real consequence so you can see why it matters.

Do:

  • Do verify name availability before drafting Article 1, because a similar-name conflict forces a complete refile.
  • Do confirm Comptroller good standing first, since franchise tax forfeiture blocks every SOS amendment.
  • Do quote amended Article text verbatim, because the SOS will not interpret narrative changes.
  • Do keep written approval in your minute book, since the certification in Article 4 must be true.
  • Do choose Option A unless you have a real reason to delay, because delayed filings create timing-mismatch risk.
  • Do retain the file-stamped certificate for seven years to comply with BOC record rules.

Don’t:

  • Don’t sign before internal approval is documented, because it makes the certification false.
  • Don’t use a P.O. Box as a registered office, because it is statutorily invalid.
  • Don’t combine a name change and a major restatement on the same form when Form 414 would be cleaner.
  • Don’t use Form 424 for a typo correction, because Form 403 is the right tool.
  • Don’t forget to update the IRS, the Comptroller, your bank, and your licensors after the SOS accepts the filing.
  • Don’t pay the wrong fee, because underpayment voids the filing date.

Pros and Cons of Filing on Your Own vs. With Help

Many filers handle Form 424 themselves, especially for simple name changes, while complex amendments often justify hiring an attorney or a registered agent service. The trade-offs below help you decide.

Pros of filing on your own:

  • You save $300 to $1,500 in attorney fees for a routine name change.
  • You learn the form for future amendments, which corporations often need yearly.
  • You control the timing precisely, which matters for closings and rebrands.
  • You avoid the lag of routing approvals through outside counsel.
  • You can use SOSDirect’s real-time validation to catch many mistakes.
  • You build a clean internal record because you handle every step.

Cons of filing on your own:

  • One paraphrased Article can void the entire amendment.
  • Franchise tax forfeiture surprises catch most pro se filers.
  • Backdating temptations create real criminal exposure.
  • Coordinating board, member, and shareholder approvals correctly is harder than it looks.
  • Restatement language in Article 3 trips up filers without legal training.
  • Mistakes that lose the filing date can cascade into tax and contract problems.

Comparing Form 424 With Related Texas Filings

Picking the right form is half the battle. The table below shows when Form 424 is correct and when a different form is the right tool.

Filing Need Correct Form
Amend Certificate of Formation (name, shares, purpose, etc.) Form 424
Change registered agent or office only Form 401
Correct a typo or clerical error in a prior filing Form 403
Restate the entire Certificate of Formation Form 414
Merge two or more entities Form 621
Convert to a different entity type Form 631
Foreign entity amendment Form 406
Voluntary termination Form 651

Key Agencies and Statutes That Interact With Form 424

The Secretary of State is the agency that receives Form 424, but several other entities shape how the form behaves. The Texas Comptroller of Public Accounts controls franchise tax status, and an entity in forfeiture cannot file. The Internal Revenue Service must be notified separately of name changes for EIN purposes.

The Texas Workforce Commission needs to update employer accounts when an entity name changes, and county clerks must be notified for any Assumed Name Certificate (Form 503) on file. Professional licensing boards such as the Texas Medical Board and the Texas Real Estate Commission also require notice when a licensed entity changes name or structure.

The governing statutes are BOC Chapter 3 for amendments generally, BOC Chapter 4 for filing mechanics and fees, and the entity-type chapters (Chapter 21 for corporations, Chapter 22 for nonprofits, Chapter 101 for LLCs, Chapter 153 for LPs) for approval rules. Read the chapter that fits your entity before filing.

Recent Agency Guidance Worth Knowing

The Secretary of State’s Filing FAQs clarify that an effective-date election under Article 5 cannot be amended after acceptance; if you need to change it, you must file a new Form 424 or a Form 403 correction. The Comptroller’s recent franchise tax guidance confirms that a name change on Form 424 does not require a new EIN but does require a Comptroller webfile update within 30 days.

A 2024 SOS policy bulletin reminded filers that SOSDirect’s typed signature satisfies the Article 4 certification, ending years of confusion about whether printed-and-rescanned signatures were required. Filers preparing amendments tied to mergers should also review Tax Code § 171.0001, which can reset franchise tax thresholds when entity structure changes mid-year.

FAQs

Is Form 424 the right form to change my registered agent?

No. Use the free Form 401 for a registered-agent-only change. Form 424 costs $150 and is meant for substantive amendments to the Certificate of Formation, not stand-alone agent updates.

Do I write my old name or new name in the heading box on page 1?

No, never the new name. Write the current legal name as it appears on file with the Secretary of State. The new name belongs only in Article 1 of Form 424.

Can I file Form 424 if my LLC is in franchise tax forfeiture?

No. The Texas Comptroller must show the entity in good standing. Reinstate using Form 801 and obtain a Tax Clearance Letter before the SOS will accept the amendment.

Do I need to quote the entire Certificate of Formation in Article 3?

No. Quote only the Article being amended, using the “is amended to read in its entirety as follows” language. A full restatement uses Form 414, not Form 424.

Is notarization required on the signature block?

No. Texas does not require notarization for Form 424. The signer certifies under penalty of perjury, and a typed signature on SOSDirect is fully valid.

Can I backdate the effective date in Article 5?

No. Backdating is a misdemeanor under BOC § 4.008. Option B allows a future date up to 90 days, but never a past date.

Does the SOS notify the IRS or my bank when my name changes?

No. You must update the IRS, your bank, the Comptroller, and any licensors yourself. The SOS only updates its own records.

Is a P.O. Box acceptable for the registered office in Article 2?

No. BOC § 5.201 requires a Texas street address where process can be served. P.O. Boxes and most commercial mailbox addresses are rejected.

Can a corporate officer who is not the president sign Form 424?

Yes, any officer authorized by the bylaws or a board resolution may sign. The title must reflect the signer’s actual office, such as Vice President or Secretary.

Do I check Box A or Box B in Article 2 if my registered agent is a law firm?

Yes, check Box A for an organization. Box B is reserved for individual human agents, and miscoding here is a frequent rejection ground.

Is the $150 fee waived for nonprofit corporations?

No, but it is reduced. Nonprofits and cooperative associations pay $25 under the SOS fee schedule. For-profit entities pay the full $150.

Can I file Form 424 to change my LLC’s tax classification with the IRS?

No. Tax classification is an IRS matter handled on Form 8832. Form 424 only changes facts in the Texas Certificate of Formation.

What happens if I write the wrong file number in the heading?

No good outcome. The filing routes to a different entity or sits in suspense. The SOS will issue a Notice of Defect, and you must correct and refile within 30 days to keep the filing date.

Can I expedite a Form 424 filing?

Yes. Add the $25 expedite fee per document for next-business-day processing. SOSDirect filings are already fast, so expediting matters most for mail and fax submissions.