Immigration & Tax Solutions, Inc. on Chula Vista's Third Avenue corridor combines federal income-tax preparation with immigration document processing from Suite B at 1229 Third Avenue. SENTRI trusted-traveler applications run parallel to the immigration-petition workflow that firms on the legal side — including Alex Monsalve Law Firm — handle for South Bay residents navigating cross-border filing requirements. Certified document translation into English accompanies tax filings for clients submitting foreign-issued income records or education credentials to the IRS. On-site notary public services eliminate the need for a separate appointment when filers must notarize affidavits or declarations under penalty of perjury. Cross-border filers requesting apostilled documents for Mexican or Latin American government agencies coordinate between this office and Interdocpro for Hague Convention compliance. The highest-complexity cases involve dual-status taxpayers filing IRS Form 1040-NR for partial-year residency, with attached treaty-based return positions and ITIN application packages submitted concurrently.