I can only say it makes no difference on your federal taxes. But if your state taxes personal income, since an LLC is registered at the state level, I can't speak for that. Also don't know what state you'll be registering in.
In my state of Florida, when you register an LLC the default registration status is "active". For me, that's not a problem. Since FL doesn't tax personal income they're not expecting a tax return.
I know in some states that do tax personal income, you're expected to report business income/expenses every year the business is "active". Weather it has income or not doesn't matter. If you're in such a state, I understand the possible delima this can cause.
For example, if you are trying to open a business banking account, the bank may require your state registration number. You can't provide that until you register. Just make sure that you initially register as "inactive" if you don't expect to actually be open for business in 2020. That will get you your registration number so you can open the bank account, as well as do other things such as get an EIN from the IRS.
THen when you're ready to actually "open for business" make absolutely certain the status is changed to "active" before you produce one single penny of business income. (back in my day in the 90's, Hawaii was notorious for permanently shutting down a business if it opened before the status change took effect.)
