How do other tax professionals generate revenue? With the big D no not that Dthey diversify. Diversification means you need to learn how to do more than just taxes. There are a good number of options out there for tax preparers. Here are some of the most common. Bookkeeping services are great to add because they are a year-round necessity. If you are already preparing taxes for the business, bookkeeping could be an easy add-on. Conversely you may acquire clients for your bookkeeping services that may become tax preparation clients as. Becoming a bookkeeper requires. Certification and bookkeeping knowledge, which may be acquired by taking a course such as the one offered by the National Association of Certified Public Bookkeepers. Another great service to add for business clients is payroll. Intuit offers great payroll solutions to mxke .