"legally due" is correct and usable in written English.
Generally speaking, you can use it when referring to something that is required by law, such as a payment amount or filing deadline. For example: "Our company must submit its taxes by April 15, which is legally due."
Reflecting the chutzpah that characterized the entire firm enterprise, Eisen commenced lawsuits, following his release, claiming that other firms had stolen legal fees that were legally due to the tragically disbanded Eisen firm.
Furthermore, his own companies tended to be awarded most of the government contracts for which they bid, although this occurred transparently and legally, due to a weak legal framework around conflict of interest.
It's simply not fair for staff not to receive the pension contributions they are legally due.
Only after protests have they received, sporadically, the modest living stipends that they are legally due.
Sales taxes for any state are legally due on online purchases that would be taxable if the items were bought in a local store.
"The secretary general repeats his call on Israel to resume the transfer of tax revenues legally due to the Palestinian Authority".
They are legally protected due to their location on margins of rivers and reservoirs, steep slopes and hilltops or, according to federal rules, when in medium or advanced stage of regeneration.
She is legally blind due to Best's disease, a rare condition.
As I was writing this account, the news broke that Obama did actually re-swear the oath (with the 35 words in the correct order, one assumes), meaning that the right-wing crank brigade can no longer gnash their teeth about how Obama somehow isn't legally president due to the muffing of the oath.
The above study also reveals moderate to severe visual impairment in 9.8% of POAG cases at time of diagnosis and 4.7% legally blind due to glaucoma (7).
It is very abundant, harvested legally, and due to its relatively small body size, it can be handled safely and, e.g., anesthesia is not needed for procedures such as blood sampling.
