Taxes are entirely lawful, with one borderline exception . Income taxes were authorized by the l6Th Amendment in I believe l9l2 ( this may explain the traditional April l5 deadline which coincides with the Titanic disaster of that year.) The exception oddly- is not widely discussed, least of all by politicians- that is- The individual states of the United States ( this is stated early in the constitution proper)- are forbidden to charge what amount to Border Taxes for commerce between say, New York and New Jersey/ However, there are tolls on all manner of bridges and tunnels which cross state lines- a de facto border tax. As far as I know this little but factual argument- and it is in the actual constitution, not amendments- ( so is on more solid ground than say Gun control versus the 2nd amendment)- has never reached the center of Washington politics- let alone the High Court! Of course it can be stated that tolls on bridges and tunnels ( which are interstate) are merely for the maintenance and upkeep of the structures, but look it over.
One possibility is the word legal.
If you want to know whether a contract is lawful and legal then you need to have it reviewed by your attorney.
Legal, Lawful
legal
A legal eagle
Legal
Lawful, legal, rightful....
legal
Permitted, legal, sanctioned.
legal eagle
legal
A lawful subject refers to an individual or entity that is legally recognized as having the capacity to engage in particular legal activities or transactions within the bounds of the law. This typically involves meeting certain criteria or qualifications set forth by the legal system.