I am in Missouri and this tax thing has fought me every step of the way regarding setup. I work from home and all sales are online. If I am understanding correctly, I will only charge sales tax to Missouri customers. All customers from states other than Missouri will not be charged sales tax nor will I include their sales on my Missouri Sales Tax form that I submit and pay. Am I correct in my understanding? Also - Shopify is automatically charging city sales tax, however, I do not have to collect for my city as my physical residence/business is not in the city/unincorporated land. How can I not have the city tax in there? Thanks for any insight!
Yes your understanding is correct. As far as Shopify including the city sales tax I think that is because they are using the highest rate for your zip code so I'm speculating that part of the zip code boundary is inside the city and part is outside. In order to exclude the city rate you'll need to setup a tax override for the entire state of Missouri since I'm assuming that you will be reporting all Missouri sales at the same rate correct?
If you need help setting up override start with this link - https://help.shopify.com/en/manual/taxes/tax-overrides?utm_source=gurucopy&utm_medium=link&utm_campa... - and then go down to this section - Override the taxes on a collection or on shipping charges. Lastly I suggest you initiate a test transaction from your website to confirm that the rate you want to be charged is now the rate that Shopify is applying.
In regard to whether or not you have a requirement to register and collect sales tax for another state did you happen to see my earlier comments concerning "economic nexus"? If you'd like to discuss that subject further please call me 713-858-0085. Reason is so that I can help you make an informed business decision for not registering in a state where you may have met their requirement to register under their economic nexus laws.