Hi Knifemaker 3,
When someone asks a question about "business" I answer in that vein.
The only thing an LLC. will do is separate your business from personal.
Actually it provides you with a level of security with regards to law suits. If someone decides to sue the maker...they can only go after the business.
The way you are operating, they can come after your business and personal assets as there is no separation.
If you are going to be a business then you should set up a business. You need to build business credit by having business credit cards and perhaps taking a loan out in the business name.
Having a separate phone number allows you to conduct business on that phone. They way you are set up, technically (if audited) you would have to go through your phone bill line by line to show which calls were business and which were personal. Failure to have that ability will allow the IRS to disallow the expense. You will have the expense removed from your return and you will be taxed and have to pay a penalty.
Having a business only phone line would eliminate that.
As well Dunn and Bradstreet (the group that keeps track of your business credit score..similar to Fair Isaac who determines your overall credit score). will take into account all "Business bills". Phone, Cell Phone, Waste, Cable, Internet, etc.
Lets not forget having an LLC gives you a lower tax rate (your set up has your business paying the same rate as your personal tax level). As well you can set up a business retirement plan (usually a SEP..Simplified Employee Plan). This allows you to deposit up to 35% of your pre-tax profit into it.
Any way the business advantages of having a business entity far outweigh the way you are operating.
Please check with your CPA and ask him/her about the advantages of a LLC.
Yes, you have to fill out both State and Federal Quarterly reports. Fairly simple and your accountant would be more than happy to fill them out for you.