Post-Effective Amendment to Post-Effective Amendment by Investment Company (Form 485BXT)

As filed with the Securities and Exchange Commission on February 6, 2026

Commission File Nos. 333-235565

811-08664

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-4

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933						[ ]
			Pre-Effective Amendment No.			[ ]
			Post-Effective Amendment No. 17			[X]
and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940

Amendment No. 975						[X]

JACKSON NATIONAL SEPARATE ACCOUNT - I

(Exact Name of Registrant)

JACKSON NATIONAL LIFE INSURANCE COMPANY

(Name of Depositor)

1 Corporate Way, Lansing, Michigan 48951

(Address of Depositor's Principal Executive Offices)

Depositor's Telephone Number, including Area Code: (517) 381-5500

Scott J. Golde, Esq., Senior Vice President, General Counsel

Jackson National Life Insurance Company, 1 Corporate Way, Lansing, MI 48951

(Name and Address of Agent for Service)

Copy to:

Alison Samborn, Esq., Assistant Vice President, Insurance Legal & Product Development

Jackson National Life Insurance Company, 1 Corporate Way, Lansing, MI 48951

Approximate Date of Proposed Public Offering:
It is proposed that this filing will become effective (check appropriate box)
[ ]			immediately upon filing pursuant to paragraph (b)
[X]			on April 27, 2026 pursuant to paragraph (b)
[ ]			60 days after filing pursuant to paragraph (a)(1)
[ ]			on (date) pursuant to paragraph (a)(1).
If appropriate, check the following box:
[X]			this post-effective amendment designates a new effective date for a previously filed post-effective amendment
Title of Securities Being Registered: the variable portion of Flexible Premium Variable and Fixed Deferred Annuity contracts

EXPLANATORY NOTE: Pursuant to Rule 485(b)(1)(iii) of the Securities Act of 1933, the sole purpose of this Post-Effective Amendment No. 17, is to designate a new effective date of the Post-Effective Amendment No. 16, which was filed on December 8, 2025 (Accession No. 0000927730-25-000644). Parts A, B, and C of Post-Effective Amendment No. 16 are unchanged and hereby incorporated by reference.

SIGNATURES As required by the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets the requirements of Securities Act Rule 485(b) for effectiveness of this post-effective amendment to the Registration Statement and has caused this post-effective amendment to the Registration Statement to be signed on its behalf, in the City of Lansing, and State of Michigan, on this 6th day of February, 2026. Jackson National Separate Account - I (Registrant) Jackson National Life Insurance Company By: /s/ SCOTT J. GOLDE Scott J. Golde Senior Vice President, General Counsel Jackson National Life Insurance Company (Depositor) By: /s/ SCOTT J. GOLDE Scott J. Golde Senior Vice President, General Counsel As required by the Securities Act of 1933, this post-effective amendment to the Registration Statement has been signed by the following persons in the capacities and on the dates indicated. * February 6, 2026 Laura L. Prieskorn, Chief Executive Officer and Director * February 6, 2026 Christopher A. Raub, President and Director * February 6, 2026 Don W. Cummings, Executive Vice President, Chief Financial Officer, and Director * February 6, 2026 Craig A. Anderson, Senior Vice President and Controller * By: /s/ SCOTT J. GOLDE Scott J. Golde, as Attorney-in-Fact, pursuant to Power of Attorney filed herewith.

POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, that each of the undersigned as directors and/or officers of JACKSON NATIONAL LIFE INSURANCE COMPANY (Jackson), a Michigan corporation, hereby appoint Laura L. Prieskorn, Christopher A. Raub, Don W. Cummings, Carrie Chelko, Susan S. Rhee, and Scott J. Golde (each with power to act without the others) his/her attorney-in-fact and agent, with full power of substitution and resubstitution, for and in his/her name, place and stead, in any and all capacities, to sign applications, registration statements, reports, and other documents, and any and all amendments thereto, with power to affix the corporate seal and to attest it, and to file such applications, registration statements, reports, and other documents, and amendments thereto, with all exhibits and requirements, in accordance with the Securities Act of 1933, the Securities Exchange Act of 1934, and/or the Investment Company Act of 1940 and the rules and regulations thereunder of the Securities and Exchange Commission. This Power of Attorney concerns Jackson National Separate Account - I (File Nos. 033-82080, 333-70472, 333-73850, 333-118368, 333-119656, 333-132128, 333-136472, 333-155675, 333-172874, 333-172875, 333-172877, 333-175718, 333-175719, 333-176619, 333-178774, 333-183048, 333-183049, 333-183050, 333-192971, 333-210504, 333-212424, 333-217500, 333-217501, 333-226897, 333-228801, 333-228802, 333-235565, 333-235567, and 333-252333), Jackson National Separate Account III (File No. 333-41153), Jackson National Separate Account IV (File Nos. 333-108433 and 333-118131), Jackson National Separate Account V (File No. 333-70697), and Jackson National Life Insurance Company (File Nos. 333-285253, 333-285254, 333-285255, 333-285256, 333-283892, and 333-283747), as well as any future separate account(s) and/or future file number(s) that Jackson establishes through which securities, particularly variable annuity contracts, variable universal life insurance policies, registered index-linked annuity contracts, contingent deferred annuity contracts, or other registered annuity contracts are to be offered for sale. The undersigned grant to each attorney-in-fact and agent full authority to take all necessary actions to effectuate the above as fully, to all intents and purposes, as he/she could do in person, thereby ratifying and confirming all that said attorneys-in-fact and agents, or any one of them, may lawfully do or cause to be done by virtue hereof. This instrument may be executed in one or more counterparts. IN WITNESS WHEREOF, the undersigned have executed this Power of Attorney effective as of the 14th day of April, 2025. /s/ LAURA L. PRIESKORN Laura L. Prieskorn, Chief Executive Officer, Chair, and Director /s/ CHRISTOPHER A. RAUB Christopher A. Raub, President and Director /s/ DON W. CUMMINGS Don W. Cummings, Executive Vice President, Chief Financial Officer, and Director /s/ CRAIG A. ANDERSON Craig A. Anderson, Senior Vice President and Controller