I stop slightly less than 1/4" or the width of the seam allowance. Perhaps a couple stitches and then back stitch a couple stitches. This allows the little bit of space for the fold just like the scant 1/4" in other seam allowances. When I start the second side I put need just into the folds. This holds the folds together and prevents bunching up that the pressure foot often does when starting at multiple layers.