Mexican Legal & Business in Chula Vista's Third Avenue Village provides bilingual tax preparation and document-assistance services from 355 Third Avenue in the 91910 zip code. The firm's ITIN-application workflow pairs IRS Form W-7 preparation with the supporting identity-verification packages that immigration-services providers such as Dina's Immigration Services help assemble. Individual filers receive Form 1040 and 1040-NR preparation with earned-income-tax-credit optimization under IRS Publication 596 guidelines. Clients navigating cross-border compliance issues can pair their tax filings with the immigration-law guidance available from Avalos Professional Services elsewhere in the city. The practice also handles California FTB Form 540NR part-year and nonresident returns, computing source-income allocation for filers who split residency between California and Mexico during the tax year.