Aguilera & Associates Bookkeeping & Tax Services on Chula Vista's Third Avenue is an IRS Certified Acceptance Agent authorized to process Individual Taxpayer Identification Number applications. ITIN filing requires IRS-specified supporting documents such as passport copies and visa identification, a documentation package that parallels the paperwork handled by immigration specialists at Infinity Tax & Immigration Services for applicants navigating both tax and residency tracks simultaneously. The firm provides full-cycle bookkeeping — bank reconciliation, accounts-payable and accounts-receivable management, depreciation schedules, and financial-statement preparation — alongside payroll and payroll-tax processing for small businesses in the Third Avenue Village district. Bilingual English and Spanish service covers individual 1040 returns, corporate 1120 filings, partnership 1065 returns, sales-tax compliance, and property-tax consulting. Business-formation packages requiring notarized articles of incorporation or operating agreements rely on the same downtown document-authentication network that includes Cal Notary Service. QuickBooks setup and training packages walk business owners through chart-of-accounts configuration, class tracking, and audit-proof recordkeeping aligned with IRS Publication 583 requirements.