We all want to know. Unfortunately, the IRS has not yet ruled if this is taxable. MA will follow whatever the IRS decides. (MA has been waiting about 3 years for a ruling.)
The IRS ruled that CA's PFML is taxable and the contributions are deductible as medical expenses (subject to 7.5% threshold) on Sch. A. (Side note: CA does not tax the PFML at the state level.) Because the IRS ruled that CA's is taxable, it is probably safest to tell clients to assume taxable unless we hear differently.
Past President, MaSEA