I assume you two are filing a joint return. As you know, a single member LLC can only have one owner. That means either you are a W-2 employee of the business, or a sub-contractor of the business. As a sub-contractor, that means that "YOU" are self employed with your own one-owner business that would probably be considered a sole-proprietorship.
As this point, declaring you a W-2 employee of your husband's business will open him up to all kinds of fines and penalties for not having paid the IRS (and state if applicable) quarterly tax payments of your W-2 with holdings.
If he issues you a 1099-MISC then as far as the IRS is concerned, you earned that income while self-employed and in business for yourself, with a completely separate business from your husband. Then, depending on the earnings of "your" business, you may be assessed fines and penalties for not having made quarterly tax payments. So you lose either way.
I would suggest that for 2019 you leave well enough alone and just let hubby claim all the business income on his SCH C. Then for 2020 he needs to actually hire you as a W-2 employee. That means he will be required to pay you as such and to withhold taxes from each of your paychecks as required by law. This includes state taxes too if your state taxes personal income, as well as U.C. taxes.
Then depending on the amount of money involved, he will be required to file form 940 either monthly or quarterly with the IRS to send the taxes he withheld from each of your paychecks, to the IRS. Again, if your state taxes personal income he'll need to do the same for the state too, using whatever forms and method of payment the state requires.
As you can see, this can get complicated very fast. So best to leave well enough alone. Besides, if you're filing a joint return, spliting the business income with you will have absolutely no impact on the overall tax liability anyway. You're just creating unnecessary paperwork that will significantly increase the probability of human error.
