How to File Form 2553

IRS Form 2553, Election by a Small Business Corporation, is the document that converts a default-taxed entity (a C-corporation or an LLC taxed as a sole proprietorship or partnership) into an S-corporation for federal tax purposes. Filing it correctly — and on time — can save eligible owners thousands of dollars a year in self-employment tax. Filing it incorrectly is the single most common reason an election is rejected or delayed by months.

This guide walks through the entire filing process. It is educational only and is not a substitute for personalized tax or legal advice. If your situation is unusual — multiple owners, a fiscal year, foreign ownership, or trust shareholders — please consult a CPA or tax attorney before filing.

Step 1: Confirm you are eligible to elect S-Corp status

Before you fill out a single line, make sure your business actually qualifies. The IRS imposes strict eligibility rules. To elect S-Corp status, your entity must:

• Be a domestic corporation or a domestic LLC eligible to be taxed as a corporation.
• Have no more than 100 shareholders. Spouses and certain family members count as one shareholder.
• Have only allowable shareholders — generally US citizens, US resident individuals, certain trusts, and estates. Partnerships, corporations, and most non-resident aliens cannot be shareholders.
• Have only one class of stock (differences in voting rights are allowed).
• Not be an ineligible entity, such as certain banks, insurance companies, or domestic international sales corporations.

If you operate as an LLC, you do not need to convert to a corporation first. The LLC remains an LLC under state law; Form 2553 simply changes how the IRS taxes it.

Step 2: Gather the information you need

Collecting the right information up front makes the rest of the process straightforward. You will need:

• Your legal business name and mailing address as registered with the IRS.
• Your Employer Identification Number (EIN).
• The state and date of incorporation or LLC formation.
• The election effective date — usually the start of your current tax year.
• The full legal name, address, Social Security Number (SSN) or ITIN, ownership percentage, and date stock was acquired for every shareholder.
• The name, title, and contact information of an officer authorized to sign on behalf of the entity.

Step 3: Complete Part I — Election Information

Part I is where the substantive election happens. Key entries include:

• Lines A–E: Entity name, address, EIN, state of incorporation, and the date of incorporation or LLC formation.
• Line E (effective date): The date the S-Corp election will take effect. For most small businesses this is January 1 of the current calendar year, or the entity's formation date if you are filing for the first tax year.
• Line F: The tax year. Most S-Corps use a calendar year. Selecting a fiscal year requires Part II and a strong business-purpose justification.
• Lines H and I: The name, title, and phone number of an officer the IRS can contact, plus the date the entity first had assets or began doing business.
• Column K (consent): Every shareholder must sign and date the consent statement. In community-property states, the non-owner spouse usually must sign too.

Step 4: Complete Parts II–IV only if they apply

Most single-owner small businesses skip Parts II, III, and IV entirely. Use them only if you are:

• Part II: requesting a fiscal tax year other than a calendar year.
• Part III: a Qualified Subchapter S Trust (QSST) electing to be treated as the shareholder.
• Part IV: filing late and asserting reasonable cause under Rev. Proc. 2013-30. See our late S-Corp election guide for details.

Step 5: Sign, then file by the deadline

An authorized officer of the corporation or LLC must sign and date Part I. Without that signature, the form is invalid no matter how perfectly the rest is filled in.

To take effect for the current tax year, Form 2553 must be filed within 75 days of the start of that tax year — or, for calendar-year entities, by March 15. Newly formed entities have 75 days from the date the entity first had shareholders, acquired assets, or began doing business, whichever is earliest. For more on timing, see our S-Corp election deadline guide.

Step 6: Mail or fax to the correct IRS service center

The IRS service center you use depends on the state of your principal business address. Current addresses and fax numbers are listed in the official Form 2553 instructions on irs.gov; double-check before mailing because the IRS occasionally changes them. Send the form by certified mail with return receipt or by fax with confirmation so you have proof of timely filing.

Step 7: Wait for IRS confirmation (CP261)

The IRS typically responds within 60 days. If your election is accepted, you will receive Notice CP261 confirming the effective date. Keep this notice with your permanent business records — your payroll provider and tax preparer will ask for it. If you have not heard back after 60 days, call the IRS Business and Specialty line at 800-829-4933 to check status.

Common mistakes that delay or kill an election

• Missing or unsigned shareholder consents in column K.
• An effective date that is earlier than the date the entity actually existed.
• Filing without an EIN — you must obtain one first.
• Mailing to the wrong service center.
• Missing the 75-day / March 15 deadline without filing under the late-election relief procedure.

When it makes sense to use a service

Form 2553 is short, but a single mistake can invalidate the entire election and cost a year of tax savings. Entity IQ generates a pre-filled, IRS-ready Form 2553 from your business details, walks you through the required signatures, and provides the correct service-center address for your state. The service handles both timely and late elections under Rev. Proc. 2013-30. For detailed line-by-line help filling the form yourself, see our Form 2553 instructions.

This article is for educational purposes and is not legal or tax advice. Every business is different — please consult a qualified CPA or tax attorney before filing.