Set up a fixed amount promotion - $10 shows up for first year but not second and following:
Sub-Total USD 90.00, then USD 90.00
Renewal Discount − USD 10.00, then USD 0.00
Total for first payment USD 80.00, then USD 90.00 per calendar year
Promotion Setting Advanced Tab "For Autorecurring payments..." set to Yes
Running Joomla 3.5.1, CB 2.0.14, CB Subs 4.1.0
Richard Brundage