Because you are required to pay the correct amount of tax and account for your business purchases and sales, it is essential that you keep adequate records. The buyer can do this through various methods such as wire, PayPal, or credit cards.Find out the steps to take when you're buying an existing business and the pros and cons of acquiring an existing business. Credit Card Payment Information. Everything you need to know about California's new credit card surcharging laws, including what's legal and illegal for businesses. Draft and Sign the Purchase Agreement. You don't have to start a business from scratch to be successful. Here's everything you need to know about buying an LLC. Stay tax-compliant with this California sales tax guide for businesses. From sales and use tax to collections and filing taxes, let Polston Tax guide you.