Best Tax Preparation Software for Professional Accountants and Firms

Tax filing software with free federal returns for every situation and flat-fee state filing.

Editor's takeFreeTaxUSA scores 9.7 out of 10 for pricing value, the top mark among tax software rated here. Federal filing stays free for every situation, including self-employment, and state returns cost a flat $15.99. It has filed more than 82 million returns securely with the IRS.

IRS-authorized e-file platform for tax extensions, built for bulk filing by accounting firms.

Editor's takeExpressExtension covers the widest range of IRS extension forms of any service reviewed, from Form 7004 to Form 8868, with bulk Excel upload built for high-volume filers. SOC 2 Type 2 and PCI-DSS certification back its security claims for handling client tax data. Independent review volume is thin, so credibility rests mostly on its parent company's 82 million processed returns.

IRS-authorized e-filing for 1099s, W-2s, and 94x forms, with pay-per-form pricing and TIN matching.

Editor's takeExpressTaxFilings fits small businesses and accountants that need to e-file 1099s, W-2s, and 94x forms without a subscription. Pay-per-form pricing scales down to $0.80 a form at volume, with corrections included free. Large CPA firms needing a full 1040 and 1120 corporate suite should look at enterprise tax software instead.

AI financial operating system automating S-Corp formation, payroll, and quarterly tax compliance for solopreneurs.

Editor's takeLettuce automatically intercepts incoming revenue to set aside quarterly taxes and payroll, removing the manual guesswork that causes most solopreneurs to underpay the IRS. Its Lettuce-Back Guarantee refunds fees if promised tax savings aren't met, backed by $15 million in Series A funding and a follow-on $28 million round. Reviewers consistently flag bookkeeping as the platform's weakest module, and it does not support businesses with W2 employees.

Free federal tax software covering 350+ credits and deductions, with flat $15.99 state filing.

Editor's takeTaxHawk keeps federal filing free regardless of complexity, covering self-employment, rental income, and crypto sales within 350+ supported credits. An IRS-approved provider since 2001, it has processed more than 82 million federal returns. State filing costs a flat $15.99, but state e-filing only works after filing the federal return through TaxHawk.

Cloud-based professional tax software with deep QuickBooks Online integration for accounting firms.

Editor's takeIntuit ProConnect ranks 7th of 16 in this category at 8.9. Its QuickBooks Online integration saves real time for firms already in that partner network. Complex consolidated corporate returns still require Intuit's other product, Lacerte.

Professional tax prep software for accountants and firms, with cloud or desktop deployment and unlimited 1040 e-filing.

Editor's takeTaxSlayer Pro splits into cloud and desktop options, letting firms pick based on office workflow. The TaxesToGo app stands out for remote document collection and e-signatures. Mac users need workaround software since the desktop build only runs natively on Windows.

Professional tax software for accounting firms, built for complex multi-state returns and CS Suite integration.

Editor's takeUltraTax CS holds roughly 22.9% market share among surveyed tax professionals, the top spot in a 2025 industry survey, largely on the strength of its multi-state return handling and automatic K-1 data linking. It integrates natively with the broader CS Professional Suite for firm-wide workflow. Pricing is unpublished, and users report increases of 20 to 50% once the initial 3-year contract expires, alongside persistent complaints about slow support.

Professional tax prep software with unlimited returns built for high-volume accounting firms.

Editor's takeDrake Tax has ranked highest overall in the Journal of Accountancy survey for 13 straight years, built on speed rather than polish. Firms filing high volumes benefit most from its flat, all-inclusive pricing.

Cloud tax prep software with offline mode, unlimited returns, and two free prior tax years included.

Editor's takeMyTAXPrepOffice's Offline Mode keeps working during an internet outage and syncs once connectivity returns, a rare feature for cloud tax software. The Unlimited Plan runs $1,295 a year and covers individual and business returns including 1065, 1120, 1120S, 1041, 990, 706, and 709 forms, plus free access to the 2023 and 2024 tax years. CFO Tech Outlook named it Cloud-Based Tax Preparation Software of the Year 2025. BBB complaints describe glitches with K-1 imports and foreign tax returns, and users report lag during peak season.

Cloud-based professional tax software with pay-as-you-go pricing and built-in bank products.

Editor's takePro Tax Pro publishes exact prices for Pay As You Go and Unlimited packages, a rarity in professional tax software where quotes are the norm. Parent company FileYourTaxes.com has been an authorized IRS e-file provider since 1995 and holds an A+ BBB rating. The Unlimited 1040 tier doesn't cover business returns, and bank product transmitter fees add to the total.

All-in-one practice management platform combining CRM, workflow automation, and a client portal for firms.

Editor's takeTaxDome's pitch is consolidation. CRM, secure messaging, e-signatures, invoicing, and a client portal all live in one platform trusted by more than 10,000 firms. The client-facing side tests well, with 93 percent of clients calling it easy to use. Firm-side setup is a different story, with reviewers describing a real time investment to configure workflows. A January 2025 configuration error briefly exposed commingled client data across firms, though the company says no sensitive information was involved.

Cloud or desktop tax software covering 1040 through 990 returns for small firms.

Editor's takeTaxAct Professional covers the full range of business entity types, from 1040 individual returns through 1120 corporate and 990 tax-exempt filings, with a choice of cloud or desktop installation. It has processed over 100 million e-files across 25 years, and MFA plus SSL encryption cover security. QuickBooks and Quicken users hit a real gap though: there's no direct data import, only CSV trial balance uploads or PDF imports from prior-year returns.

Cloud and desktop tax software powered by the TaxWise engine, with year-round US support.

Editor's takeUltimateTax licenses the same TaxWise engine bigger firms pay more for, a real cost advantage. A blind tax professional called it the most accessible option she tested, form fields labeled perfectly. The catch is bank products, skip them and the price jumps $700 a year.

Forms-based tax software with 6,000+ forms, backed by Wolters Kluwer.

Editor's takeATX's form library, over 6,000 strong, is hard to match for small firms handling varied filings. Users rated its training resources 4.5 out of 5, the highest of any product in a 2024 survey. Accounting integration is its clear weak point, rated 2.8 out of 5, the lowest score in that same survey.