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Small Business CPA, Tax Preparation & Bookkeeping | ProTax USA ProTax USA is a licensed CPA firm providing tax preparation, bookkeeping, payroll, and IRS resolution services to individuals, freelancers, and small businesses across the United States. We handle federal and state tax filings, back taxes, multi-state returns, and ongoing bookkeeping for LLCs, S-corps, sole proprietors, and nonprofits. Our team specializes in the complex cases other firms avoid, including years of unfiled returns and IRS notices. Transparent pricing, fast turnaround, and remote service available nationwide, from Wyoming to Florida.