Sainz Tax Solutions in Chula Vista's Broadway corridor operates from 730 Broadway, Suite 301, where IRS-registered preparer Maria Sainz (RTRP) serves the 91910 community. The practice doubles as a California DMV Partner and notary office, processing driver's-license transactions alongside Form 1040 filings—a multi-service scope that parallels the combined tax-and-insurance workflow at Freeway Insurance on the same corridor. Bilingual English-and-Spanish service covers individual returns, Schedule C self-employment filings, and earned-income-tax-credit optimization for working families in the 91910 and 91911 zones. Business owners coordinating bookkeeping, payroll, and entity-formation paperwork can align their tax filings with the startup advisory guidance available from Armas Business Consultants elsewhere in the city. Complex returns include Form 8862 Earned Income Credit recertification filings for taxpayers who previously had the credit disallowed by the IRS and must requalify under current due-diligence requirements.