  We suggest an effective field theory framework to discuss deviations from the
minimal supersymmetric Standard Model (MSSM) which is based on an alternative
arrangement of the gauge-Higgs sector. In this effective MSSM (EffMSSM)
nonlinearly realised $SU(2)\times U(1)$ gauge sector is described by an
$SU(2)\times U(1)$-valued massive vector superfield, which contains a neutral
CP-even and charged Higgs fields, while another neutral CP-even Higgs and the
neutral CP-odd Higgs fields are residing in an $SU(2)\times U(1)$-singlet
chiral superfield. Although the new theory contains the same particle content
as the conventional MSSM, the unconventional representation of superfields
allows for new type of interactions, which may lead to a significant
modification of the phenomenology. As an illustrative example we consider
EffMSSM with modified Higgs and electroweak gauge sector augmented by gaugino
soft supersymmetry breaking masses, $M_i~ (i=1,2,3)$ and the Standard Higgs
soft-breaking masses, $m_{H_u}=m_{H_d}$ and $B_{\mu}$, and point out distinct
features in the Higgs and gaugino sectors as compared to MSSM. In particular,
we show that the lightest neutral CP-even Higgs boson with mass $\sim 125$ GeV
can be easily accommodated within EffMSSM.
