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As filed with the Securities and Exchange Commission on April 27, 2016.

Registration No. 333-            

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM S-3

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

Equifax Inc.

(Exact name of Registrant as specified in its charter)

1550 Peachtree Street, N.W.

Atlanta, GA 30309

(404) 885-8000

(Address, including zip code, and telephone number, including area code, of Registrant’s principal executive offices)

John J. Kelley III, Esq.

Corporate Vice President and Chief Legal Officer

Equifax Inc.

1550 Peachtree Street, N.W.

Atlanta, Georgia 30309

(404) 885-8000

(Name, address, including zip code, and telephone number, including area code, of agent for service)

with copies to:

Carrie A. Ratliff, Esq.

King & Spalding LLP

1180 Peachtree Street, N.E.

Atlanta, Georgia 30309

(404) 572-2801

Approximate date of commencement of proposed sale to the public: From time to time after the effective date of this Registration Statement.

If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box.  ¨

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, please check the following box.  x

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ¨

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ¨

If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box.  x

If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box.  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one)

CALCULATION OF REGISTRATION FEE

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PROSPECTUS

DEBT SECURITIES

COMMON STOCK

PREFERRED STOCK

WARRANTS

We may offer, from time to time, in one or more series:

We may sell any combination of these securities in one or more offerings in amounts, at prices and on terms to be determined at the time of the offering. These securities may also be offered and sold by one or more selling securityholders to be identified in the future.

Each time securities are offered pursuant to this prospectus, we will provide a prospectus supplement and attach it to this prospectus. The prospectus supplement will contain specific information about the terms of the offering and the offered securities and may also add, update or change the information in this prospectus. You should read this prospectus and the applicable prospectus supplement carefully before you invest in our securities.

Our common stock is listed on the New York Stock Exchange under the symbol “EFX.”

This prospectus may not be used to offer or sell any securities unless accompanied by a prospectus supplement.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The date of this prospectus is April 27, 2016

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ABOUT THIS PROSPECTUS

This prospectus is part of a shelf registration statement that we have filed with the Securities and Exchange Commission, or SEC, under the Securities Act of 1933, as amended, or the Securities Act. By using a shelf registration statement, we or any selling securityholder may sell, at any time and from time to time, in one or more offerings, debt securities, common stock, preferred stock or warrants.

Each time we sell securities, we will provide a prospectus supplement that contains specific information about the terms of those securities and the offering, and this prospectus may not be used to sell securities unless accompanied by the applicable prospectus supplement. The prospectus supplement may add, update or change information contained in this prospectus. If there is any inconsistency between the information in this prospectus and the applicable prospectus supplement, you should rely on the information in the prospectus supplement. You should read both this prospectus and any prospectus supplement together with the additional information described below in the section entitled “Where You Can Find More Information.”

We may also prepare free writing prospectuses to describe the terms of particular securities, which terms may vary from those described in any prospectus supplement. You therefore should carefully review any free writing prospectus in connection with your review of this prospectus and the applicable prospectus supplement.

You should rely only on the information contained in this prospectus or any prospectus supplement, including any information that we incorporate by reference, or any free writing prospectus that we distribute. We have not authorized anyone to provide you with different information, and we do not take any responsibility for, or provide any assurance as to the reliability of, any other information that others may give you. You should not assume that the information contained or incorporated by reference in this prospectus or a prospectus supplement or contained in any free writing prospectus is accurate as of any date other than the date of the document. We are not making an offer of securities in any jurisdiction where the offer is not permitted.

Throughout this prospectus, when we use the terms “we,” “us,” “our” and similar terms, we are referring to Equifax Inc. and its subsidiaries, collectively, as the context requires.

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WHERE YOU CAN FIND MORE INFORMATION

The registration statement that we have filed with the SEC registers the securities offered by this prospectus under the Securities Act. The registration statement, including the exhibits to it, contains additional relevant information about us. The rules and regulations of the SEC allow us to omit some information included in the registration statement from this prospectus.

In addition, we file annual, quarterly and current reports, proxy and information statements and other information with the SEC. Our SEC filings, including the registration statement, are available to the public from the SEC’s website at http://www.sec.gov. To receive copies of public records not posted to the SEC’s website at prescribed rates, you may complete an online form at http://www.sec.gov, send a fax to (202) 772-9337 or submit a written request to the SEC, Office of FOIA/PA Operations, 100 F Street, N.E., Washington, D.C. 20549. Please call the SEC at 1-800-SEC-0330 for further information. You also may read reports and other information about us at the offices of the New York Stock Exchange at 20 Broad Street, New York, New York 10005.

We also make available free of charge on our website, www.equifax.com, under “About Equifax/Investor Relations/Financial Information/SEC Filings,” all materials that we file electronically with the SEC, including our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, Section 16 reports and amendments to those reports as soon as reasonably practicable after such materials are electronically filed with, or furnished to, the SEC. Information contained on our website or any other website is not incorporated by reference into this prospectus and does not constitute a part of this prospectus.

The SEC allows us to “incorporate by reference” the information we have filed with the SEC. This means that we can disclose important information to you without actually including the specific information in this prospectus by referring you to other documents filed separately with the SEC. These other documents contain important information about us, our financial condition and our results of operations. The information incorporated by reference is considered part of this prospectus from the date we file that document. Information that we file later with the SEC and that is incorporated by reference in this prospectus will automatically update and may supersede information contained or incorporated by reference in this prospectus or any prospectus supplement.

We incorporate by reference in this prospectus the documents and portions of documents listed below and any future filings made with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934, as amended, or the Exchange Act (other than, in each case, information deemed to have been furnished and not filed in accordance with SEC rules):

You may obtain any of the documents incorporated by reference in this prospectus from the SEC through the SEC’s website at the address provided above. You may also request and we will provide, free of charge, a copy of any document incorporated by reference in this prospectus (excluding exhibits to such document unless an exhibit is specifically incorporated by reference in the document) by visiting our internet website at www.equifax.com or by writing or calling us at the following address and telephone number: Equifax Inc., Corporate Secretary, 1550 Peachtree Street, N.W., Atlanta, Georgia 30309, telephone (404) 885-8000.

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USE OF PROCEEDS

We intend to use the net proceeds from the sales of the securities as set forth in the applicable prospectus supplement.

LEGAL MATTERS

Unless otherwise indicated in the applicable prospectus supplement, the validity of any securities to be offered will be passed upon for us by our counsel, King & Spalding LLP. Any underwriters will be represented by their own legal counsel.

EXPERTS

Independent Registered Public Accounting Firm

The consolidated financial statements of Equifax Inc. appearing in Equifax Inc.’s Annual Report (Form 10-K) for the year ended December 31, 2015 filed with the Securities and Exchange Commission on February 24, 2016 and the effectiveness of Equifax Inc.’s internal control over financial reporting as of December 31, 2015 have been audited by Ernst & Young LLP, independent registered public accounting firm, as set forth in their reports thereon, included therein, and incorporated herein by reference. Such consolidated financial statements and financial statement schedule are incorporated herein by reference in reliance upon such reports given on the authority of such firm as experts in accounting and auditing.

Independent Auditors

The consolidated financial statements of Veda Group Limited as of June 30, 2015 and 2014 and for the years then ended appearing in Equifax Inc.’s Current Report on Form 8-K/A filed with the Securities and Exchange Commission on April 27, 2016 have been incorporated by reference herein in reliance upon the report of KPMG, independent auditors, incorporated by reference herein, and upon the authority of said firm as experts in accounting and auditing.

The liability of KPMG, in relation to the performance of their professional services provided to Veda Group Limited, including, without limitation, KPMG’s audit of Veda Group Limited’s financial statements described above, is limited under the Institute of Chartered Accountants in Australia (NSW) Scheme approved by the New South Wales Professional Standards Council or such other applicable scheme approved pursuant to the Professional Standards Act of 1994 (NSW), including the Treasury Legislation Amendment (Professional Standards) Act.

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PART II

INFORMATION NOT REQUIRED IN PROSPECTUS

The following table sets forth the estimated expenses in connection with the issuance and distribution of the securities being registered other than underwriting discounts and commissions. All such expenses will be borne by the Registrant.

Set forth below is a description of certain provisions of the amended and restated articles of incorporation and bylaws of the Registrant and the Georgia Business Corporation Code, or the GBCC, as such provisions relate to the indemnification of the directors and officers of the Registrant. This description is intended only as a summary and is qualified in its entirety by reference to the Registrant’s amended and restated articles of incorporation and bylaws and the GBCC.

Section 14-2-851 of the GBCC provides that a corporation may indemnify an individual made a party to a proceeding because he or she is or was a director against liability incurred in the proceeding if: (1) such individual conducted himself or herself in good faith; and (2) such individual reasonably believed: (a) in the case of conduct in his or her official capacity, that such conduct was in the best interests of the corporation; (b) in all other cases, that such conduct was at least not opposed to the best interests of the corporation; and (c) in the case of any criminal proceeding, that the individual had no reasonable cause to believe such conduct was unlawful. Section 14-2-851 further provides that a corporation may not indemnify a director: (1) in connection with a proceeding by or in the right of the corporation, except for reasonable expenses incurred in connection with the proceeding if it is determined that the director has met the relevant standard of conduct; or (2) in connection with any proceeding with respect to conduct for which he or she was adjudged liable on the basis that personal benefit was improperly received by him or her, whether or not involving action in his or her official capacity.

Section 14-2-852 of the GBCC provides that a corporation shall indemnify a director who was wholly successful, on the merits or otherwise, in the defense of any proceeding to which the director was a party because he or she was a director of the corporation against reasonable expenses incurred by the director in connection with the proceeding.

Additionally, Section 14-2-854 of the GBCC provides that the court conducting the proceeding or another court of competent jurisdiction, upon application by a director, may order indemnification or advance for expenses (1) if the director is entitled to indemnification pursuant to the GBCC or (2) if, in consideration of all relevant circumstances, the court determines that the individual is fairly and reasonably entitled to indemnification, whether or not the standard of conduct set forth above was met and even if the director has been adjudged liable; provided, however, that if the director has been adjudged so liable, the indemnification is limited to reasonable expenses incurred.

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Section 14-2-857 of the GBCC provides that a corporation may indemnify and advance expenses to an officer of the corporation (1) to the same extent as a director; and (2) if he or she is not a director, to such further extent as may be provided by the articles of incorporation, the bylaws, a resolution of the board of directors, or contract, except for liability arising out of conduct that constitutes: (a) appropriation of any business opportunity of the corporation; (b) acts or omissions that involve intentional misconduct or a knowing violation of law; (c) unlawful distribution; or (d) receipt of an improper personal benefit. Section 14-2-857 further provides that an officer of the corporation who is not a director is entitled to mandatory indemnification under Section 14-2-852 and may apply to a court under Section 14-2-854 for indemnification or advances for expenses, in each case to the same extent to which a director may be entitled to indemnification or advances for expenses under those provisions.

The amended and restated articles of incorporation and bylaws of the Registrant provide for indemnification of directors, officers, employees and agents and advancement of expenses to the fullest extent permitted under the GBCC.

Section 14-2-202(b)(4) of the GBCC provides that a corporation may, in its articles of incorporation, eliminate or limit the liability of a director to the corporation or its shareholders for monetary damages for any action taken, or any failure to take any action, as a director, except liability for: (1) any appropriation, in violation of his or her duties, of any business opportunity of the corporation; (2) acts or omissions which involve intentional misconduct or a knowing violation of law; (3) unlawful distributions; or (4) any transaction from which the director received an improper personal benefit, provided that no such provision shall eliminate or limit the liability of a director for any act or omission occurring prior to the date when such provision becomes effective.

The Registrant’s amended and restated articles of incorporation limit the personal liability of directors to the same extent as the GBCC.

The Registrant’s amended and restated articles of incorporation also provide that the indemnification rights contained in the bylaws shall not be exclusive of any other right which any person may have or hereafter acquire under any statute, bylaw, agreement, vote of shareholders or disinterested directors or otherwise. The Registrant has purchased and maintains liability insurance to protect its directors and officers against any liability asserted against them or incurred by them as permitted by its amended and restated articles of incorporation and Section 14-2-858 of the GBCC. The insuring of the directors and officers is permitted whether or not the Registrant would have the power to indemnify that director or officer under its amended and restated articles of incorporation and bylaws or the terms of the GBCC.

These indemnification provisions may be sufficiently broad to permit indemnification of the Registrant’s directors and officers for liabilities (including reimbursement of expenses incurred) arising under the Securities Act.

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(a) Rule 415 Offering. The undersigned Registrant hereby undertakes:

(1) to file, during any period in which offers or sales are being made, a post-effective amendment to this Registration Statement: (i) to include any prospectus required by Section 10(a)(3) of the Securities Act; (ii) to reflect in the prospectus any facts or events arising after the effective date of the Registration Statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the Registration Statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with the SEC pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no more than a 20% change in the maximum aggregate offering price set forth in the “Calculation of Registration Fee” table in the effective Registration Statement; and (iii) to include any material information with respect to the plan of distribution not previously disclosed in the Registration Statement or any material change to such information in the Registration Statement; provided, however, that clauses (i), (ii) and (iii) do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the SEC by the Registrant pursuant to Section 13 or Section 15(d) of the Exchange Act that are incorporated by reference in the Registration Statement, or is contained in a form of prospectus filed pursuant to Rule 424(b) that is part of the Registration Statement;

(2) that, for the purpose of determining any liability under the Securities Act, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof;

(3) to remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering;

(4) that, for the purpose of determining liability under the Securities Act to any purchaser:

(A) Each prospectus filed by the Registrant pursuant to Rule 424(b)(3) shall be deemed to be part of the Registration Statement as of the date the filed prospectus was deemed part of and included in the Registration Statement; and

(B) Each prospectus required to be filed pursuant to Rule 424(b)(2), (b)(5) or (b)(7) as part of a Registration Statement in reliance on Rule 430B relating to an offering made pursuant to Rule 415(a)(1)(i), (vii) or (x) for the purpose of providing the information required by section 10(a) of the Securities Act shall be deemed to be part of and included in the Registration Statement as of the earlier of the date such form of prospectus is first used after effectiveness or the date of the first contract of sale of securities in the offering described in the prospectus. As provided in Rule 430B, for liability purposes of the issuer and any person that is at that date an underwriter, such date shall be deemed to be a new effective date of the registration statement relating to the securities in the Registration Statement to which that prospectus relates, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof; provided, however , that no statement made in a Registration Statement or prospectus that is part of the Registration Statement or made in a document incorporated or deemed incorporated by reference into the Registration Statement or prospectus that is part of the Registration Statement will, as to a purchaser with a time of contract of sale prior to such effective date, supersede or modify any statement that was made in the Registration Statement or prospectus that was part of the Registration Statement or made in any such document immediately prior to such effective date; and

(5) that, for the purpose of determining liability of the Registrant under the Securities Act to any purchaser in the initial distribution of the securities, the undersigned Registrant undertakes that in a primary offering of securities of the undersigned Registrant pursuant to this Registration Statement, regardless of the underwriting method used to sell the securities to the purchaser, if the securities are offered or sold to such purchaser by means of any of the following communications, the undersigned Registrant will be a seller to the purchaser and will be considered to offer or sell such securities to such purchaser:

(A) Any preliminary prospectus or prospectus of the undersigned Registrant relating to the offering required to be filed pursuant to Rule 424;

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(B) Any free writing prospectus relating to the offering prepared by or on behalf of the undersigned Registrant or used or referred to by the undersigned Registrant;

(C) The portion of any other free writing prospectus relating to the offering containing material information about the undersigned Registrant or its securities provided by or on behalf of the undersigned Registrant; and

(D) Any other communication that is an offer in the offering made by the undersigned Registrant to the purchaser.

(b) Filings Incorporating Subsequent Exchange Act Documents by Reference. The undersigned Registrant hereby undertakes that, for purposes of determining any liability under the Securities Act, each filing of Registrant’s annual report pursuant to Section 13(a) or Section 15(d) of the Exchange Act (and, where applicable, each filing of an employee benefit plan’s annual report pursuant to Section 15(d) of the Exchange Act) that is incorporated by reference in this Registration Statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

(c) Request for Acceleration of Effective Date or Filing of Registration Statement Becoming Effective Upon Filing. Insofar as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers and controlling persons of the Registrant pursuant to the foregoing provisions, or otherwise, the Registrant has been advised that in the opinion of the SEC such indemnification is against public policy as expressed in the Securities Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the Registrant of expenses incurred or paid by a director, officer or controlling person of the Registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the Registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Act and will be governed by the final adjudication of such issue.

(d) Qualification of Trust Indenture Under the Trust Indenture Act of 1939 for Delayed Offerings. The undersigned Registrant hereby undertakes to file an application for the purpose of determining the eligibility of the trustee to act under subsection (a) of Section 310 of the Trust Indenture Act in accordance with the rules and regulations prescribed by the SEC under Section 305(b)(2) of the Act.

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SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Atlanta, State of Georgia, on April 27, 2016.

POWER OF ATTORNEY

Each person whose signature appears below hereby constitutes and appoints John W. Gamble, Jr., Nuala M. King, John J. Kelley III, and Shawn K. Baldwin, and each of them (so long as each such individual is an employee or affiliate of Equifax Inc.), any of whom may act without the joinder of the others, as his or her lawful attorneys-in-fact and agents, with full power of substitution and resubstitution for him or her and in any and all capacities, to sign any or all amendments or post-effective amendments to this registration statement and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto such attorneys-in-fact and agents full power and authority to do and perform each and every act and thing requisite and necessary to be done in connection therewith, as fully for all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that such attorneys-in-fact and agents, or his or her substitute, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, as amended, this Registration Statement has been signed below by the following persons in the capacities indicated below on April 27, 2016.

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