The revised rule allowing practice owners to include up to $20,833 of their compensation towards the PPP loan forgiveness calculation extends to S-Corp owners too. Previously, owner comp was capped at $15,385, which is a max salary of $100k divided by 52 weeks multiplied by 8 for the Covered Period.
Your salary only qualifies for this higher limit if you will base your PPP Loan forgiveness calculation on the 24-week Covered Period per the revised instructions:
Owner Compensation: Enter any amounts paid to owners (owner-employees, a self-employed individual, or general partners). For a 24-week Covered Period, this amount is capped at $20,833 (the 2.5-month equivalent of $100,000 per year) for each individual or the 2.5-month equivalent of their applicable compensation in 2019, whichever is lower. For an 8-week Covered Period, this amount is capped at 8/52 of 2019 compensation (up to $15,385).