  We present a new method for supermassive black hole (SMBH) mass measurements
in Type 1 active galactic nuclei (AGN) using polarization angle across broad
lines. This method gives measured masses which are in a good agreement with
reverberation estimates. Additionally, we explore the possibilities and limits
of this method using the STOKES radiative transfer code taking a dominant
Keplerian motion in the broad line region (BLR). We found that this method can
be used for the direct SMBH mass estimation in the cases when in addition to
the Kepler motion, radial inflows or vertical outflows are present in the BLR.
Some advantages of the method are discussed.
