Can we file the Labor Condition Application (LCA) before April 1st?
Yes. But remember LCAs can be filed only six months ahead of the H-1B start date. If it is filed, say, March 25th, the H1B start date has to be September 25th and ending date would be September 24th three years later. Still the employer can ask for a start date of October 1st, but the ending date has to be September 24th three years later, coinciding with the LCA ending date.