Best Corporate tax accountants in Seattle, WA (2026)

How we ranked: Our editorial team evaluated firms on four weighted criteria. Corporate tax specialization and business advisory capabilities received the highest weight (40%), followed by online reputation signals including client feedback and professional standing (30%). Geographic accessibility within the Seattle metro area accounted for 20%, while breadth of service offerings beyond basic compliance rounded out the final 10%. We prioritized firms that present a clear corporate focus over generalist practices.

1. Moss Adams

Moss Adams earned our top spot for corporate tax services in Seattle. The firm operates a substantial Seattle office staffed with professionals who specialize across assurance, tax, and consulting disciplines. What distinguished Moss Adams in our assessment was the apparent scale and infrastructure that multi-state and growing enterprises often require. For corporations dealing with complex tax positions across jurisdictions, the breadth of resources this firm brings appears particularly valuable. We found their Seattle presence to be more than a satellite operation, functioning as a hub for Puget Sound area clients. The firm's structure suggests capacity to handle sophisticated corporate engagements that smaller practices might refer out.

2. Eide Bailly

Eide Bailly secured second place based on their integrated approach to tax, audit, advisory, and technology services. We were impressed by the explicit mention of technology expertise, which aligns particularly well with Seattle's concentration of tech companies and innovation-driven businesses. The firm positions itself around performance improvement and risk reduction, suggesting a forward-looking advisory stance rather than purely retrospective compliance work. For corporate clients seeking to align tax strategy with business technology initiatives, Eide Bailly presents as an especially relevant choice. Their stated focus on long-term growth support resonated with our criteria for business advisory capabilities beyond traditional tax preparation.

3. Sweeney Conrad

Sweeney Conrad ranked third as our editorial pick for closely held corporations and business owners with significant personal wealth considerations. Operating as a locally-owned firm in the Puget Sound area, they explicitly focus on closely held companies and high net worth individuals, a specialization we valued highly. The combination of corporate tax services with personal wealth planning creates particular value for owner-operators and family businesses where corporate and personal tax strategies intersect. Their client accounting services alongside tax work suggest a relationship-focused practice model. We found their local ownership and regional focus to be differentiators in a market where many firms operate as branches of national organizations.

4. Ryan Tax Firm

Ryan Tax Firm earned fourth place for their distinctive global reach and integrated service delivery. Describing themselves as a global tax services, software, and technology firm, Ryan appears to operate at a different scale than traditional CPA firms. Their provision of federal, state, local, and international tax services through an integrated suite stood out in our evaluation. For corporations with cross-border operations or multi-jurisdictional tax issues, Ryan's structure suggests particular competence. The inclusion of software and technology in their service model indicates a more modern delivery approach. We selected Ryan for companies that need specialized tax advisory work beyond what general practice firms typically offer.

5. Greenwood Ohlund CPAs

Greenwood Ohlund CPAs claimed fifth position as a full-service tax, accounting, and business consulting firm with Seattle roots. The firm presents itself as offering all three disciplines under one roof, which we found valuable for corporate clients seeking integrated advice. Business consulting capabilities alongside tax compliance work suggest a practice that engages with strategic questions, not just annual filing obligations. Their Seattle location and apparent focus on the local market positioned them well in our geographic accessibility criterion. We appreciated the breadth indicated by "full service" while maintaining what appears to be a manageable firm size for partner-level attention to corporate clients.

6. Jacobson Lawrence & Company

Jacobson Lawrence & Company secured sixth place with their emphasis on innovative digital strategies alongside traditional tax services. The firm describes expertise in both tax services and business solutions, with specific mention of fiscal excellence and digital innovation. This combination caught our attention as particularly relevant for Seattle's digitally-oriented business environment. Companies undergoing digital transformation or operating in e-commerce and online business models may find this firm's stated approach especially aligned with their needs. We valued their positioning at the intersection of traditional CPA services and modern business technology, a balance that appears increasingly important for corporate clients.

7. Aldaris CPA

Aldaris CPA Group ranked seventh for their stated focus on both individual and business clients throughout Seattle and Northwest Washington. The firm offers tax, accounting, and advisory services with a clear geographic concentration in the region. We found their specific identification of Northwest Washington as their service area to suggest deep local knowledge and accessibility. For corporations that value a regional specialist over a national firm, Aldaris presents as a strong option. Their grouping of advisory services with tax and accounting indicates a practice model that extends beyond compliance into strategic territory. The firm appears sized appropriately for small to mid-market corporate clients seeking ongoing relationships.

8. HAAS CPA, PLLC

HAAS CPA, PLLC earned eighth place with their explicit emphasis on tax planning services. While many firms offer tax preparation, HAAS CPA's stated focus on planning suggests a more proactive advisory stance. We valued this distinction, as corporate clients often gain more value from forward-looking tax strategy than from compliance alone. The firm serves both individuals and businesses, but their specific mention of tax planning for business clients aligned well with our corporate focus criteria. Seattle-based companies looking to minimize future tax liability through structural planning and strategy may find HAAS CPA's approach particularly relevant. Their practice appears appropriately sized for personalized attention.

9. Vazquez CPA & Company

Vazquez CPA & Company secured ninth position for their wide variety of accounting, tax, and financial management services. The inclusion of financial management alongside traditional CPA services distinguished this firm in our evaluation. For corporate clients who need help with both tax strategy and broader financial operations, this integrated offering presents clear value. As a Seattle CPA firm serving the local market, Vazquez appears to offer accessibility and regional knowledge. We found their breadth of services to suggest a practice capable of growing alongside client companies, handling increasingly complex needs as businesses scale. The firm presents as a solid choice for corporations seeking a long-term advisory relationship.

10. Raymond Lyle CPA PLLC

Raymond Lyle CPA PLLC rounded out our top ten as our editorial pick for businesses and individuals seeking expert services in Seattle and surrounding communities. The firm's positioning suggests a more boutique practice model where clients likely work directly with senior professionals. For small to mid-market corporations that value personal relationships and partner-level attention, this structure offers distinct advantages over larger firms where work may be delegated to junior staff. Their focus on expert tax and accounting services indicates deep technical capability despite a more intimate firm size. We selected Raymond Lyle CPA for inclusion based on the value that personalized service delivers to many corporate clients.

FAQ

What should corporations look for when selecting a tax accountant in Seattle?

Corporations should prioritize firms with demonstrated experience in business tax issues rather than primarily individual tax practices. Look for advisory capabilities beyond compliance, including tax planning, entity structure optimization, and multi-state tax considerations if you operate across state lines. Geographic proximity matters less than it once did, but local Seattle knowledge of Washington state tax requirements remains valuable. Consider whether the firm's size and structure align with your company's complexity and growth trajectory.

How do corporate tax services differ from individual tax preparation?

Corporate tax services involve entity-level tax compliance including C-corporation and S-corporation returns, partnership filings, and LLC tax elections. Beyond filing requirements, corporate engagements typically include quarterly estimated tax planning, payroll tax compliance, sales tax nexus analysis, and strategic advisory work around business transactions. Corporate accountants also address issues like reasonable compensation for owner-employees, capital structure optimization, and coordination between business and owner personal tax positions. The relationship tends to be year-round rather than seasonal.

Should Seattle businesses hire a local firm or consider national providers?

The decision depends on your business's specific needs and operational footprint. Local Seattle firms typically offer stronger knowledge of Washington state tax specifics, B&O tax issues, and regional economic conditions. They may provide more accessible, relationship-focused service. National or regional firms bring deeper resources for multi-state operations, specialized industries, and complex technical issues. Companies with significant out-of-state operations, international transactions, or highly specialized needs often benefit from larger firm infrastructure. Many Seattle businesses find mid-sized regional firms offer an optimal balance.

When should a growing business upgrade from a basic tax preparer to a corporate tax specialist?

Consider upgrading when your business crosses certain thresholds: exceeding $1 million in annual revenue, operating across multiple states, adding employees in different jurisdictions, contemplating entity restructuring, planning significant capital investments, or preparing for outside investment or sale. If you find yourself with tax questions throughout the year rather than just at filing time, that signals a need for ongoing advisory services. Companies facing IRS or state tax examinations also benefit from specialist representation. The transition often makes sense when tax strategy can materially impact business profitability and growth.

Editorial opinion only. Rankings reflect our independent assessment based on the criteria above, drawn from publicly available information current as of 2026-05-14. No firm paid for placement or editorial review.