Users of H&R Block report receiving this message when attempting to prepare their return after the latest update:
“Since you’re claiming the ACA premium tax credit and the self-employed health insurance deduction, your return requires additional calculations that aren’t part of the program. To file an accurate return, we recommend you complete your return with an H&R Block Tax professional.
You must fix this problem before filing.”
At this point the best option for self-employed taxpayers who are or may be entitled to claim a premium tax credit for exchange-purchased insurance appears to be TurboTax, which appears to calculate amounts correctly.
TaxAct software seems to also be able to handle the correct calculations, so may be an acceptable alternative to H&R Block.