UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549


                                   FORM 10-K

(Mark One)

         [X]   ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
         SECURITIES EXCHANGE ACT OF 1934

         For the fiscal year ended:   December 31, 1999

                                      OR

         [ ]   TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
         SECURITIES EXCHANGE ACT OF 1934

         For the transition period from               to

                     Commission file number: 033-63714-87


                                  CWMBS, Inc.
              Mortgage Pass-Through Certificates, Series 1999-12
            (Exact name of Registrant as specified in its charter)


            Delaware                                95-4449516
(State or other jurisdiction of          (IRS Employer Identification Number)
incorporation or organization)

c/o      The Bank of New York
         101 Barclay Street
         New York, New York                            10286
(Address of principal executive offices)             (Zip Code)

Registrant's telephone number, including area code:   (212) 815-2007

Securities registered pursuant to Section 12(b) of the Act:  None

Securities registered pursuant to Section 12(g) of the Act:  None

<PAGE>

Indicate by check mark whether the Registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
Registrant was required to file such reports), and (2) has been subject to
such filing requirements for the past 90 days. Yes X No

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405
of Regulation S-K ( ss.229.405 of this chapter) is not contained herein, and
will not be contained, to the best of Registrant's knowledge, in definitive
proxy or information statements incorporated by reference in Part III of this
Form 10-K or any amendment to this Form 10-K. [ ]

State the aggregate market value of the voting and non-voting common
equity held by non-affiliates of the Registrant: Not applicable

Indicate the number of shares outstanding of each of the registrant's
classes of common stock, as of December 31, 1999: Not applicable

<PAGE>

DOCUMENTS INCORPORATED BY REFERENCE

                                     None.

                                     * * *

     This Annual Report on Form 10-K (the "Report") is filed with respect to
the trust fund entitled CHL Mortgage Pass-Through Trust 1999-12 (the "Trust
Fund") formed pursuant to the pooling and servicing agreement dated as of
September 1, 1999 (the "Pooling and Servicing Agreement") among CWMBS, Inc.,
as depositor (the "Company"), Countrywide Home Loans, Inc., as seller and
master servicer (the "Master Servicer"), and The Bank of New York, as trustee
(the "Trustee"), for the issuance of CWMBS, Inc., Mortgage Pass-Through
Certificates, Series 1999-12 (the "Certificates"). Certain information
otherwise required to be included in this Report by the Instructions to Form
10-K has been omitted in reliance on the relief granted to the Company in
CWMBS, Inc. (February 3, 1994) (the "Relief Letter").


<PAGE>

                                    PART I

ITEM 1.  BUSINESS

         Not applicable.  See the Relief Letter.

ITEM 2.  PROPERTIES

         Not applicable.  See the Relief Letter.

ITEM 3.  LEGAL PROCEEDINGS

         There were no material pending legal proceedings relating to
         the Trust Fund to which any of the Trust Fund, the Trustee,
         the Master Servicer or the Company was a party or of which
         any of their respective properties was the subject during
         the fiscal year covered by this Report, nor is the Company
         aware of any such proceedings contemplated by governmental
         authorities.

ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

         No matter was submitted to a vote of Certificateholders, and
         no Certificateholder consent was solicited during the fiscal
         year covered by this Report.

<PAGE>

                                    PART II

ITEM 5.  MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS

         (a)      There is no established public trading market for the
         Certificates.

         (b)      As of December 31, 1999 there were less than 300 holders of
         record of the Certificates.

         (c)      Not applicable. (Information as to distributions to
         Certificateholders is provided in the Registrant's monthly filings
         on Form 8-K.)

ITEM 6.  SELECTED FINANCIAL DATA

         Not applicable.  See the Relief Letter.

ITEM 7.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
         RESULTS OF OPERATIONS

         Not applicable.  See the Relief Letter.

ITEM 7A  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

         Not applicable.  See the Relief Letter.

ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

         Not applicable.  See the Relief Letter.

ITEM 9.  CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
         FINANCIAL DISCLOSURE

         None.

<PAGE>

                                   PART III

ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

         Not applicable.  See the Relief Letter.

ITEM 11. EXECUTIVE COMPENSATION

         Not applicable.  See the Relief Letter.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

         (a)      Not applicable.  See the Relief Letter.

         (b)      Not applicable.  See the Relief Letter.

         (c)      Not applicable.  See the Relief Letter.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

         (a)      Not applicable.  See the Relief Letter.

<PAGE>

                                    PART IV


ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K

                         (a) (1) Pursuant to the Pooling and Servicing
                    Agreement, the Master Servicer is required (i) to deliver
                    an annual statement as to compliance with the provisions
                    of the Pooling and Servicing Agreement and certain other
                    matters (the "Annual Statement of the Master Servicer")
                    and (ii) to cause a firm of independent public accountants
                    to deliver an annual report as to compliance with the
                    servicing provisions of the Pooling and Servicing
                    Agreement (the "Annual Report of the Firm of
                    Accountants"). The Annual Statement of the Master Servicer
                    is attached as Exhibit 99.1 to this Report. The Annual
                    Report of the Firm of Accountants is required to be
                    delivered not later than 120 days after the end of the
                    Master Servicer's fiscal year. The Registrant hereby
                    undertakes to file the Annual Report of the Firm of
                    Accountants as an Exhibit to a Form 10-K/A amending this
                    Form 10-K promptly following the date on which such report
                    becomes available.

           (2)      Not applicable.

           (3)      The required exhibits are as follows:

                                   Exhibit 3(i): Copy of Company's Certificate
                    of Incorporation (Filed as an Exhibit to Registration
                    Statement on Form S-3 (File No. 33-63714)).

                                   Exhibit 3(ii): Copy of Company's By-laws
                    (Filed as an Exhibit to Registration Statement on Form S-3
                    (File No. 33-53614)).

                                   Exhibit 4: Pooling and Servicing Agreement
                    (Filed as part of the Registrant's Current Report on Form
                    8-K filed on October 29, 1999).

                                   Exhibit 99.1: Annual Statement of the
                    Master Servicer.

<PAGE>

               (b) Current Reports on Form 8-K filed during the last quarter
               ending December 31, 1999:

               Date of Current Report                   Item Reported
               October 25, 1999                 Monthly report sent to
                                                certificateholders with the
                                                October 1999 distribution

               November 25,1999                 Monthly report sent to
                                                certificateholders with the
                                                November 1999 distribution

               December 27, 1999                Monthly report sent to
                                                certificateholders with the
                                                December 1999 distribution

               (c)    See subparagraph (a)(3) above.

               (d)    Not applicable.  See the Relief Letter.

     SUPPLEMENTAL INFORMATION TO BE FURNISHED WITH REPORTS FILED PURSUANT TO
SECTION 15(d) OF THE ACT BY REGISTRANTS WHICH HAVE NOT REGISTERED SECURITIES
PURSUANT TO SECTION 12 OF THE ACT.

     No such annual report, proxy statement, form of proxy or other soliciting
material has been sent to Certificateholders. See the Relief Letter.

<PAGE>

                                  SIGNATURES

     Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the Registrant has duly caused this Report to be signed
on its behalf by the undersigned, thereunto duly authorized.

                                        CWMBS, INC.,
                                        MORTGAGE PASS-THROUGH CERTIFICATES,
                                        SERIES 1999-12

                                        By:    The Bank of New York,
                                               as Trustee*


                                        By:    /s/ Courtney Bartholomew
                                               Name:  Courtney Bartholomew
                                               Title: Assistant Vice President

                                        Date: March 22, 2000



------------------------
*   This Report is being filed by the Trustee on behalf of the Trust Fund. The
    Trust Fund does not have any officers or directors.

<PAGE>


                                 EXHIBIT INDEX

                                                                   Sequential
Exhibit Document                                                  Page Number

3(i)           Company's Certificate of Incorporation (Filed as an Exhibit to
               Registration Statement on Form S-3 (File No. 33-63714)) *

3(ii)          Company's By-laws (Filed as an Exhibit to Registration
               Statement on Form S-3 (File No. 33-63714)) *

4              Pooling and Servicing Agreement (Filed as part of the Company's
               Current Report on Form 8-K filed on October 29, 1999) *

99.1           Annual Statement of the Master
               Servicer.....................................................12



---------------------------
*   Incorporated herein by reference.

<PAGE>


                                 Exhibit 99.1

<PAGE>

COUNTRYWIDE HOME LOANS, INC.

                             OFFICERS' CERTIFICATE
                    ANNUAL STATEMENT OF THE MASTER SERVICER


                                  CWMBS, INC.
                    CHL MORTGAGE PASS THROUGH TRUST 1999-12
              MORTGAGE PASS-THROUGH CERTIFICATES, SERIES 1999-12


     The undersigned do hereby certify that they are each an officer of
Countrywide Home Loans, Inc. (the "Master Servicer") and do hereby further
certify pursuant to Section 3.16 of the Pooling and Servicing Agreement for
the above-captioned Series (the "Agreement") that:

         (i) A review of the activities of the Master Servicer during the
         preceding calendar year and of the performance of the Master Servicer
         under the Agreement has been made under our supervision; and

         (ii) To the best of our knowledge, based on such review, the Master
         Servicer has fulfilled all its obligations under the Agreement
         throughout such year.




/s/ Thomas H. Boone                                  Dated: 3/22/00

THOMAS H. BOONE
MANAGING DIRECTOR,
  PORTFOLIO MANAGEMENT


/s/ David A. Spector                                 Dated: 3/22/00

DAVID A. SPECTOR
SENIOR VICE PRESIDENT