Sund & Sund CPAs maintains a La Mesa Boulevard practice in the heart of La Mesa Village, serving individual and small-business tax clients from the 8021 block between Spring Street and Date Avenue. The two-CPA structure enables concurrent preparation of interdependent returns—an S-corp Form 1120-S and its shareholders' K-1 pass-through schedules, for example—while payroll-tax coordination with specialists like Accounting & Payroll Solutions, Inc covers multi-state withholding splits. Individual returns address California-specific itemized deductions, AMT crossover calculations, and net-investment-income surtax thresholds under IRC Section 1411. Business clients along La Mesa Boulevard receive quarterly estimated-tax projections, sales-tax-permit filings with the CDTFA, and year-end Section 199A qualified-business-income deduction modeling—analysis that benefits from annual document-production runs at nearby Copy-It - San Diego Printing Services. The firm prepares California Form 100S and Schedule R apportionment worksheets for S-corps generating revenue across multiple states, applying the market-based sourcing rules codified in Revenue and Taxation Code Section 25136.