willowlau, just to clarify, the true-up is not permitted for both types of performance-based grants you’ve listed.
The grant-date fair value of grants of service-based awards (e.g. stay employed with us for three years and the options will cliff-vest at the end of this period) and performance-based awards (nonstock-price goals, e.g. EPS, ROE) are recorded, with subsequent true-up for the actual amount that vests.
Performance-based awards that are contingent upon “market-based” (e.g. stock price, TSR) criteria cannot be trued-up. However, the grant-date fair value may be discounted by the estimated probability of actually achieving the performance objective(s).
Anyway, a quick review of p.149 of Volume II ought to clarify matters for you.