<TABLE> <S> <C>

<ARTICLE>                     5
<LEGEND>
This  schedule  contains  summary  financial   information  extracted  from  the
Bioanalytical  Systems, Inc. consolidated  financial statements contained in the
company's  annual  report  on Form  10-K and is  qualified  in its  entirety  by
reference to such financial statements.
</LEGEND>
<MULTIPLIER>                              1000

<S>                                    <C>                          <C>
<PERIOD-TYPE>                                3-MOS                         YEAR
<FISCAL-YEAR-END>                      SEP-30-1999                  SEP-30-1999
<PERIOD-START>                          JUL-1-1999                   OCT-1-1998
<PERIOD-END>                           SEP-30-1999                  SEP-30-1999
<CASH>                                       1,924                        1,924
<SECURITIES>                                     0                            0
<RECEIVABLES>                                3,683                        3,683
<ALLOWANCES>                                     0                            0
<INVENTORY>                                  1,791                        1,791
<CURRENT-ASSETS>                             7,721                        7,721
<PP&E>                                      17,355                       17,355
<DEPRECIATION>                               5,024                        5,024
<TOTAL-ASSETS>                              26,321                       26,321
<CURRENT-LIABILITIES>                        3,446                        3,446
<BONDS>                                          0                            0
<PREFERRED-MANDATORY>                            0                            0
<PREFERRED>                                      0                            0
<COMMON>                                     1,000                        1,000
<OTHER-SE>                                  16,421                       16,421
<TOTAL-LIABILITY-AND-EQUITY>                26,321                       26,321
<SALES>                                      2,822                        9,858
<TOTAL-REVENUES>                             5,223                       19,851
<CGS>                                        1,219                        3,943
<TOTAL-COSTS>                                2,724                       10,442
<OTHER-EXPENSES>                             2,024                        8,448
<LOSS-PROVISION>                                 0                            0
<INTEREST-EXPENSE>                            (115)                        (227)
<INCOME-PRETAX>                                412                          847
<INCOME-TAX>                                   103                          277
<INCOME-CONTINUING>                            309                          570
<DISCONTINUED>                                   0                            0
<EXTRAORDINARY>                                  0                            0
<CHANGES>                                        0                            0
<NET-INCOME>                                   309                          570
<EPS-BASIC>                                  .07                          .13
<EPS-DILUTED>                                  .07                          .12


</TABLE>