New Business Formation

Thinking of starting a business but don't know how? We can help you. All businesses must obtain a business license from the local city or county in which the business is being conducted. New business owners are advised to obtain a federal Employer Identification Number (EIN) and a state sales and use tax license, if applicable, before applying for a business license.


Business Taxes

Over 15 years of Business tax experience

Preparing your own tax return can be a complicated and confusing process. At Casa Castillo Services, Inc., you will find expert trained tax preparers who understand your unique situation. We can answer all of your tax questions quickly and efficiently with friendly, professional service. And we will prepare and file your Business tax return for you. When you work with us you know not only was your return prepared correctly but that you will be getting the maximum return you qualify for. Our expert team is always here to assist you.


  • Business Tax Returns Preparation

  • Tax Document Checklist

  • Tax Planning and Consultation

    • We have extended hours during the tax season, and we’re also in the office all year to help with tax planning and consultation. Many tax questions can be handled via phone or email, and for more complicated issues we can schedule an appointment and create a tax planner.


  • Amended and Back-year Returns

    • If you’re behind in filing, you may have received a letter from the IRS or FTB. We can file older, back-year returns to help get you up-to-date with your filing requirements. We can also amend tax returns that need correction. Some back-year returns can be filed electronically, but amended returns are generally mailed-in and have longer response times.


Accounting Team

Our Accounting department has amazing team ready for work with you.

Veronica Castillo

Accounting Supervisor

Maria Hernandez

Accounting Manager










Erika Banuelos

Financial Controller

Small Business Tax Information FAQ


  • What's considered a tax deductible small business expense?

    • According to the tax code, just about any business expense that is "ordinary, necessary and reasonable" will qualify as a deduction that will decrease the profits of your business for tax reasons. But what are considered ordinary and necessary expenses? According to the Internal Revenue Service (IRS), these are any expenses which are "helpful and appropriate" for you business.

      For example, if you purchase a new computer for your small business, or buy stationary to send out your mailings, these expenses would probably be considered ordinary and necessary. However, if you buy a new computer for your son to use in his room, this would not be a business expense even if you ran your small business from home.

      There are a few expenses that are explicitly prohibited from being considered an ordinary and necessary business expense, such as:

      • Bribes to public officials;
      • Traffic tickets;
      • Home telephone expenses; and
      • Clothing that you wear while on the job (unless you are required to wear a uniform).
  • I use my personal car in my business -- is that a tax deductible business expense?

    • The short answer is yes, but you'll need to do some calculations to determine how much can be deducted. This can be determined by using either the standard mileage method or the actual expense method. There are some situations when you must use the standard mileage rate, like when claiming a Section 179 deduction in the previous tax year.

      The standard mileage method is most commonly chosen because of its easier record-keeping requirements. Under this method, you can deduct a set amount for each business mile that you drive. For the 2019 tax year, the standard mileage deduction rate was 58 cents per business mile.

      If you use the actual expense method, you're allowed to deduct the actual costs you incur each year to operate your car for your business, plus depreciation. This can include costs for:

      • Gas;
      • Oil changes;
      • Repairs/maintenance;
      • Licensing fees;
      • Insurance;
      • Tolls; and
      • Car Washes.

      However, if any of these expenses were related to your personal use of the car, they could not be included in your deduction calculation.