================================================================================



                UNITED STATES SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                 --------------

                                    Form 11-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, 2005

                                       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 0-22342
                                   -----------


                 TRIAD GUARANTY INC. 401 (K) PROFIT SHARING PLAN
                            (Full title of the Plan)



                               TRIAD GUARANTY INC.

                            101 SOUTH STRATFORD ROAD
                       WINSTON-SALEM, NORTH CAROLINA 27104
             (Name of issuer of the securities held pursuant to the
             plan and the address of its principal executive office)





===============================================================================






                               Triad Guaranty Inc.
                           401(k) Profit-Sharing Plan

                 Financial Statements and Supplemental Schedule
                              (Modified Cash Basis)

                        As of December 31, 2005 and 2004,
                    and for the Year Ended December 31, 2005




                                    Contents

Report of Independent Registered Public Accounting Firm.......................1

FINANCIAL STATEMENTS:

   Statements of Net Assets Available for Benefits (Modified
      Cash Basis).............................................................2
   Statement of Changes in Net Assets Available for
      Benefits (Modified Cash Basis)..........................................3
   Notes to Financial Statements (Modified Cash Basis)........................4

SUPPLEMENTAL SCHEDULE:

   Schedule H, Line 4i - Schedule of Assets (Held at End of Year)
      (Modified Cash Basis)...................................................9


EXHIBIT:
   23.2 Consent of Independent Registered Public Accounting Firm





















                                    SIGNATURE

Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the Plan
Administrator  of the Triad Guaranty Inc. 401(k)  Profit-Sharing  Plan, has duly
caused  this  annual  report  to be  signed by the  undersigned  thereunto  duly
authorized.





                                 TRIAD GUARANTY INC. 401(K) PROFIT-SHARING PLAN

June 23, 2006
                                 By: /s/ Earl F. Wall
                                 ------------------------
                                 Earl F. Wall
                                 Senior Vice President, Secretary, General
                                   Counsel and Plan Administrator






















             Report of Independent Registered Public Accounting Firm

Plan Administrator of the Triad Guaranty Inc.
    401(k) Profit-Sharing Plan

We have audited the accompanying statements of net assets available for benefits
(modified cash basis) of the Triad Guaranty Inc. 401(k)  Profit-Sharing  Plan as
of December  31,  2005 and 2004,  and the  related  statement  of changes in net
assets available for benefits  (modified cash basis) for the year ended December
31,  2005.  These  financial  statements  are the  responsibility  of the Plan's
management.  Our  responsibility  is to express  an  opinion on these  financial
statements based on our audits.

We conducted our audits in accordance  with the standards of the Public  Company
Accounting Oversight Board (United States). Those standards require that we plan
and perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement.  We were not engaged to perform an
audit of the  Plan's  internal  control  over  financial  reporting.  Our audits
included  consideration of internal control over financial  reporting as a basis
for designing audit  procedures that are appropriate in the  circumstances,  but
not for the purpose of expressing an opinion on the  effectiveness of the Plan's
internal  control  over  financial  reporting.  Accordingly,  we express no such
opinion. An audit also includes examining,  on a test basis, evidence supporting
the  amounts  and  disclosures  in  the  financial  statements,   assessing  the
accounting  principles  used and significant  estimates made by management,  and
evaluating the overall  financial  statement  presentation.  We believe that our
audits provide a reasonable basis for our opinion.

As described in Note 2, these financial statements and the supplemental schedule
were prepared on a modified cash basis of accounting,  which is a  comprehensive
basis of accounting other than accounting  principles  generally accepted in the
United States.

In our opinion,  the financial  statements  referred to above present fairly, in
all material respects, information regarding the Plan's net assets available for
benefits  (modified  cash  basis) at  December  31,  2005 and 2004,  and changes
therein (modified cash basis) for the year ended December 31, 2005, on the basis
of accounting described in Note 2.

Our audits were performed for the purpose of forming an opinion on the financial
statements taken as a whole. The accompanying  supplemental  schedule  (modified
cash  basis)  of  assets  (held at end of  year) as of  December  31,  2005,  is
presented for purposes of additional  analysis and is not a required part of the
financial statements but is supplementary information required by the Department
of Labor's Rules and Regulations for Reporting and Disclosure under the Employee
Retirement  Income  Security  Act of 1974.  This  supplemental  schedule  is the
responsibility of the Plan's  management.  The supplemental  schedule  (modified
cash basis) has been subjected to the auditing  procedures applied in our audits
of the  financial  statements  and,  in our  opinion,  is  fairly  stated in all
material respects in relation to the financial statements taken as a whole.

 /s/ Ernst & Young LLP
----------------------
June 22, 2006
Greensboro, North Carolina

                                       1


                               Triad Guaranty Inc.
                           401(k) Profit-Sharing Plan

                 Statements of Net Assets Available for Benefits
                              (Modified Cash Basis)


                                               December 31
                                         2005               2004
                                         ----               ----

ASSETS
Investments, at fair value            $14,242,735       $13,843,546
                                     ------------      ------------
Net assets available for benefits     $14,242,735       $13,843,546
                                     ============      ============
See accompanying notes.

































                                       2


                               Triad Guaranty Inc.
                           401(k) Profit-Sharing Plan

            Statement of Changes in Net Assets Available for Benefits
                              (Modified Cash Basis)

                          Year Ended December 31, 2005



Additions:
   Investment income (loss):
      Interest and dividends                                  $    323,711
      Net depreciation in fair value of investments               (619,782)
                                                              ------------
                                                                  (296,071)
                                                              ------------
   Contributions:
      Participants                                               1,193,994
      Employer                                                     476,076
      Rollover                                                      87,715
                                                              ------------
                                                                 1,757,785
                                                              ------------
Total additions                                                  1,461,714
                                                              ------------

Deductions:
   Benefits paid to participants                                 1,062,525
                                                              ------------
 Total deductions                                                1,062,525
                                                              ------------

Net increase                                                       399,189

Net assets available for benefits:
   Beginning of year                                            13,843,546
                                                              ------------
   End of year                                                $ 14,242,735
                                                              ============

See accompanying notes.

                                       3



                               Triad Guaranty Inc.
                           401(k) Profit-Sharing Plan

                          Notes to Financial Statements
                              (Modified Cash Basis)

                                December 31, 2005



1. DESCRIPTION OF PLAN

The following  description of the Triad Guaranty Inc. 401(k) Profit-Sharing Plan
(the Plan) provides only general  information.  Participants should refer to the
Plan agreement for a more complete description of the Plan's provisions.

GENERAL

The Plan is a salary  deferral  401(k)  defined  contribution  plan covering all
employees of Triad Guaranty Inc. and its  subsidiaries  (the Company or the Plan
Sponsor)  who have at least  three  months of service  and are age  eighteen  or
older. The Plan is subject to the provisions of the Employee  Retirement  Income
Security Act of 1974 (ERISA) as amended.  The Plan became  effective  October 1,
1993.

CONTRIBUTIONS

Each year,  participants may contribute up to 15% of their annual  compensation,
as defined in the Plan. However,  these elective deferral  contributions may not
exceed the dollar limitation contained in Section 402(g) of the Internal Revenue
Code. Participants who are age 50 or older during the calendar year and make the
maximum  allowable  pre-tax  contribution  to the plan are  entitled  to make an
additional  "catch-up  contribution",  up  to a  maximum  of  $4,000  for  2005.
Participants may also contribute amounts  representing  distributions from other
qualified defined benefit or defined  contribution plans. In accordance with the
Plan  provisions,  the Company  may match the  participant's  elective  deferral
contribution. For 2005, the Company matched 50% of contributions up to 8% of the
participant's  eligible  compensation.  The  discretionary  percentage  match is
determined by the Plan sponsor.  Additional  amounts may be  contributed  at the
option of the Plan sponsor.

Upon enrollment,  a participant may direct employee  contributions to any of the
Plan's fund  options.  Participants  may change their  investment  options daily
online with Merrill  Lynch,  but can change  their  contribution  percents  only
quarterly. Participants can elect to discontinue their contributions to the Plan
at any time,  however,  those  participants  must wait until the next  available
entrance date to participate again.  Employer  contributions are invested in the
participant's investment options using the participant's percent selections.

                                       4



                               Triad Guaranty Inc.
                           401(k) Profit-Sharing Plan

                          Notes to Financial Statements
                        (Modified Cash Basis) (continued)



1. DESCRIPTION OF PLAN (continued)

FORFEITURES

Forfeitures  of  matching  contributions  totaling  $20,377 in 2005 were used to
reduce  employer  contributions  during the year. At December 31, 2005 and 2004,
forfeitures of $46,144 and $20,377 were outstanding.

PARTICIPANT ACCOUNTS

Each  participant's  account is credited  with the  participant's  contributions
(elective   deferral   contribution)   and  allocations  of  (a)  the  Company's
contributions   and  (b)  the  Plan's   earnings.   Allocations   are  based  on
participants'  compensation  and  account  balances.  The  benefit  to  which  a
participant   is  entitled  is  the  benefit  that  can  be  provided  from  the
participant's account.

VESTING

Participants  are  immediately  vested in their own  contributions  plus  actual
earnings thereon.  Vesting in the Company contribution portion of their accounts
plus  actual  earnings  thereon  is  based  on  years  of  continuous   service.
Participants  are 20% vested after 1 year of service,  40% vested after 2 years,
60% vested  after 3 years,  80%  vested  after 4 years and 100%  vested  after 5
years.

PARTICIPANTS LOANS

Participants  may borrow  from  their fund  accounts a minimum of $1,000 up to a
maximum equal to the lesser of $50,000 or 50% of their vested  account  balance.
Loan terms range from 1-5 years or up to 15 years for the  purchase of a primary
residence. The loans are secured by the balance in the participant's account and
bear interest at a rate  commensurate  with local prevailing rates as determined
quarterly  by the Plan  administrator.  Principal  and interest are paid ratably
through semi-monthly payroll deductions.


                                       5


                               Triad Guaranty Inc.
                           401(k) Profit-Sharing Plan

                          Notes to Financial Statements
                        (Modified Cash Basis) (continued)



1. DESCRIPTION OF PLAN (continued)

PAYMENT OF BENEFITS

On termination of service, a participant may receive a lump-sum payment equal to
the  vested  value of his or her  account.  Upon  disability  or  retirement,  a
participant  may receive either a lump-sum  payment equal to the vested value of
his or her account,  or choose from several annuity  options.  Beneficiaries  of
Plan  participants  have the same benefit payment options as disabled or retired
participants  upon the death of participants.

PLAN TERMINATION

Although  it has not  expressed  any intent to do so, the  Company has the right
under the Plan to discontinue its contributions at any time and to terminate the
Plan  subject  to the  provisions  of ERISA.  In the event of Plan  termination,
participants will become 100 percent vested in their accounts.

2. SUMMARY OF ACCOUNTING POLICIES

BASIS OF ACCOUNTING

The financial  statements of the Plan are prepared under the modified cash basis
of  accounting,  which is a  comprehensive  basis of accounting  other than U.S.
generally  accepted  accounting  principles.  Under this basis,  investments are
recorded at fair value,  contributions  are recorded  when received and benefits
are recorded when paid.

INVESTMENT VALUATION

The Plan's  investments  are stated at fair value.  The shares of the registered
investment companies are valued at quoted market prices, which represent the net
asset values of shares held by the Plan at year-end.  Marketable  securities are
stated at fair  value.  The fair value of the  participation  units owned by the
Plan in the collective trust are based on quoted  redemption  values on the last
business  day of the plan  year.  The  participant  loans  are  valued  at their
outstanding balances, which approximate their fair value.

                                       6



                               Triad Guaranty Inc.
                           401(k) Profit-Sharing Plan

                          Notes to Financial Statements
                        (Modified Cash Basis) (continued)



2. SUMMARY OF ACCOUNTING POLICIES (continued)

USE OF ESTIMATES

The financial statements are prepared on a modified cash basis, which is a basis
of accounting other than U.S.  generally  accepted  accounting  principles.  The
preparation of financial  statements  requires management to make estimates that
affect the amounts reported in the financial  statements and accompanying notes.
Actual results could differ from those estimates.

3. INVESTMENTS

The Plan's investments are held by a bank administered trust fund. Investments
that represent 5 percent or more of the Plan's net assets as of December 31 are
as follows:

                                                       2005             2004
                                                   ----------------------------
Investments at fair value as determined by quoted
  market price:
      Triad Guaranty Inc. Common Stock             $ 2,982,434      $ 3,931,157
      Merrill Lynch Retirement Preservation Trust    2,838,771        2,803,980
      Davis New York Venture Fund                    2,115,662        1,955,243
      PIMCO Total Return Fund                        1,061,470          963,423
      Alger Capital Appreciation Portfolio             995,219          944,358
      Merrill Lynch S&P 500 Index Fund                 861,178                -


During 2005, the Plan's investments (including  investments purchased,  sold, as
well as held during the year) depreciated in value as follows:

                                                       Net Appreciation/
                                                        (Depreciation)
                                                     in Fair Value During
                                                             Year
                                                    ---------------------

Triad Guaranty Inc. Common Stock                        ($1,070,023)
Mutual Funds                                                481,621
Self Directed Brokerage Accounts                            (31,380)
                                                    ---------------------
                                                        ($  619,782)
                                                    =====================

                                       7


                               Triad Guaranty Inc.
                           401(k) Profit-Sharing Plan

                          Notes to Financial Statements
                        (Modified Cash Basis) (continued)



4. EXEMPT PARTY-IN-INTEREST TRANSACTIONS

Investment funds managed by Merrill Lynch,  the trustee of the Plan,  qualify as
party-in-interest.  The  Plan  sponsor  pays all  fees  for  investment  manager
services.  The Plan also holds  common  stock of the Company  that  qualifies as
party-in-interest.

Certain  administrative  functions are performed by officers or employees of the
Company.  No such officer or employee  receives  compensation from the Plan. All
administrative  expenses  are paid  directly  by the  Plan  sponsor.

5. RISKS AND UNCERTAINTIES

The Plan invests in various  investment  securities.  Investment  securities are
exposed to various risks such as interest rate,  market and credit risks. Due to
the level of risk associated with certain investment securities,  it is at least
reasonably  possible  that changes in the values of investment  securities  will
occur  in  the  near  term  and  that  such  changes  could  materially   affect
participants  account balances and the amounts reported in the statements of net
assets available for benefits.

6. INCOME TAX STATUS

The  underlying  non-standardized  prototype plan has received an opinion letter
from the Internal Revenue Service (IRS) dated June 4, 2002 stating that the form
of the Plan is qualified  under Section 401 of the Internal  Revenue  Code,  and
therefore, the related trust is tax-exempt. In accordance with Revenue Procedure
2002-6 and  Announcement  2001-77,  the Plan Sponsor has  determined  that it is
eligible  to and has chosen to rely on the current IRS  prototype  plan  opinion
letter.  Once qualified,  the Plan is required to operate in conformity with the
Code to maintain its qualification.  The Plan administrator believes the Plan is
being operated in compliance  with the applicable  requirements of the Code and,
therefore,  believes  that the Plan is  qualified  and the related  trust is tax
exempt.


                                       8














                              SUPPLEMENTAL SCHEDULE
























                               Triad Guaranty Inc.
                           401(k) Profit-Sharing Plan

                    Schedule H, Line 4i -- Schedule of Assets
                   (Held at End of Year) (Modified Cash Basis)
                            EIN #56-1838519 Plan #001
                                December 31, 2005



                                                              (c)
                                                   Description of Investment,
                     (b)                         Including Maturity Date, Rate       (e)
         Identity of Issue, Borrower,             of Interest, Collateral, Par     Current
(a)        Lessor or Similar Party                     or Maturity Value            Value
-------------------------------------------------------------------------------------------
                                                                        

   *Triad Guaranty Inc. Common Stock                       67,798 shares       $  2,982,434
   *Merrill Lynch Retirement Preservation Trust         2,838,771 shares          2,838,771
    Davis New York Venture Fund                            62,779 shares          2,115,662
    PIMCO Total Return Fund                               101,092 shares          1,061,470
    Alger Capital Appreciation Portfolio                  101,449 shares            995,219
   *Merrill Lynch S&P 500 Index Fund                       56,323 shares            861,178
    Federated International Equity Fund                    34,490 shares            660,486
    MFS Intl New Discovery Fund                            27,184 shares            648,078
    Self-directed accounts                                598,194 shares            598,194
   *Merrill Lynch Value Opportunities Fund                 20,307 shares            519,659
   *Merrill Lynch Fundamental Growth Fund                  16,430 shares            307,904
    Van Kampen American Value Fund                          9,269 shares            252,499
    Allianz CCM Mid-Cap Fund                                5,755 shares            153,029
    Blackrock Small/Mid-Cap Growth                          8,973 shares            128,594
    The Oakmark EQ & INC Fund                               1,948 shares             48,516
    AIM Basic Balanced Fund                                 2,154 shares             26,394
    Dreyfus Founders Discovery Fund                           553 shares             15,830
    Allianz RCM Global Tech                                   382 shares             14,881
    Participant Loans                      Various maturities with rates
                                             ranging from 5.00% to 7.75%             13,083
    Cash                                                                                854
                                                                               ------------
                                                                               $ 14,242,735
                                                                               ============
* Indicates party in interest to the Plan


Note:  Cost  information  has not been  included  because  all  investments  are
       participant directed.


                                        9