How can I extend H-1B status for one (1) year at a time beyond the six-year maximum period?

You will be able to extend H-1B status in one-year increments beyond the six-year limit if your Labor Certification application (Form ETA-9089) or your employment-based immigrant petition (Form I-140) has been pending for 365 days or more. Therefore, to be eligible for the one-year extension at a time, a Labor Certification application or I-140 petition must be filed before the H-1B reaches the 6th year.