As far as I know, you are already assigned an LPN when you first got your H1B approved. Since the same LPN will be used when you transfer, quota (65,000 or 20,000) doesn't matter. You can still do it anytime. But as far as the paystubs, I think what everyone is saying above is correct. If you are not on payroll of your current employer (getting paystubs), you don't qualify to transfer your H1B. Someone I know went through this a month ago. DP