[hollerith]

Until 2004, Massachusetts banned alcohol sales for off-premise consumption on Sundays.

Still in effect is a ban on sales for off-premise consumption after 11:00pm and before 08:00am. Also, the number of stores that can sell alcohol for off-premise consumption is restricted by a quota system.

[premisis]

Your premise, that a premise is a premisis, is incorrect.

[hollerith]

I do not catch your meaning.

Experts sometimes spell it "off-premise":

https://www.nabca.org/covid-19-dashboards-premise-retailers has "While there are several different retail channels permitted to sell alcoholic beverages for offsite (off-premise) consumption".

https://www.parkstreet.com/states/california/ has "Retailers [c]an sell product directly to consumers for on or off-premise consumption".

"Off-premises" is also used.

[premisis]

Check on that in a dictionary of repute.

My own folk etymology of this infelicity is that it started with the mispronunciation, which is actually hard to avoid in rapid speech, and bled over to people simply writing the wrong word.

Edit: [in reply to your edit]

It is indeed a rather common malapropism.

[BalinKing]

The OED says that the "house or building..." use of "premise" actually comes from an earlier legal meaning ("The subject of a conveyance or bequest..."). Even for those who (inaccurately) think etymology determines "correctness", this isn't an incorrect use of the word.

[hollerith]

I think I'm going to keep on spelling it the way I did.

[premisis]

You can do that. And, for some percentage of the population who reads your writing, you will appear under-educated in this matter. It will look like you dont know the right word to use. The other part of the population won't notice.

[alsetmusic]

And a very small percentage of the population will need to be right so badly that they point it out on HN. C'mon, I'm super pedantic and even I think you're going a bit far. Also, no need to throw shade when pointing out grammatical and spelling issues.

[BalinKing]

"Premisis" is not an English word, as far as I can tell.