You must submit a paper filing and a supplemental form to the Assessor's Office. Both forms are on our e-filing site.There are three ways to file the Business Property Statements (571-L) 1. Filing your statement via the internet 2. Capital gain taxes are calculated on a taxpayer's total income. When a lower middle market business in California gets sold, there are seven classes of assets. To apply for a business license, you may apply online here or complete the Business License Application (New Business Tax Affidavit form). What is a Business Property Statement (BOE Form 571L)?. California Law prescribes a yearly ad valorem tax based on property as it exists. You will need to allocate the amount reflected on form 8594 among all the assets.