Charging such payments to sponsored Awards when the leave was likely not entirely accrued while working on those Awards can be justified as allowable. This is because it is consistent with UW’s policy of charging such payments to the same location as a PI's current salary, regardless of funding source. Care should be taken to ensure the payment is reasonable in relation to the effort paid from the award and that the charge does not negatively impact the ability of the PI to meet program/project objectives.
The Graduate school explained that the $150 lump sum payment provided to Graduate Student Assistants on appointment (GRA, GTA, or GAA) is compensation in lieu of an increase in salary. This is an allowable cost on most sponsored Awards with two caveats: 1) NIH sets the reasonable compensation level for graduate students to the first year (zero-level”) Post Doc salary and fringe compensation. So if this additional $150 is over this limitation it could be deemed unreasonable and disallowed; 2. Since this is compensation, the cost should be allocated on the same basis to all funding sources that are paying their salary.