Established practice
The firm has served privately held businesses across Long Island and the New York metropolitan area since 2005.
Services for businesses, owners, and private clients
Accounting, tax, and advisory built around what you need next.
Get a finance function that keeps pace with the business, tax advice before decisions are final, and focused preparation when a lender, buyer, or external auditor raises the stakes.
Prefer to call about becoming a client? (631) 677-1344
Primary ongoing business relationship
Reliable accounting and year-round business tax, together.
Business Accounting & Tax combines recurring accounting operations, a dependable close, useful management reporting, Controller oversight, and coordinated business-tax planning. Targeted CFO Advisory can be added when forecasts, scenarios, or decision support would materially help management.
FoundationAccounting operations, close, reporting, and business tax
OversightController review and clearer financial accountability
As warrantedTargeted CFO Advisory for planning and decisions
Support layers and focused engagements
Add the capabilities the situation actually requires.
Client Accounting Services and Tax can support an ongoing relationship. Audit Readiness, Transaction Advisory, and Internal Audit are focused engagements tied to a defined deadline, transaction, or risk question.
Ongoing support layers
Client Accounting ServicesAccounting operations, controller oversight, reporting, forecasting, and CFO advisory.For clearer numbers and better decisions without building every finance capability internally.
TaxYear-round business-tax support and coordinated Private Client Services.For established companies, owners, and families whose tax needs extend beyond a once-a-year filing process.
Focused engagements
Audit ReadinessPreparation for an external financial-statement audit performed by another CPA firm.For companies facing a known external-audit requirement and needing structured preparation.
Transaction AdvisorySeller-side financial and tax readiness, earnings and working-capital analysis, and preparation for buyer diligence.For owners beginning active preparation for a future sale.
Internal AuditNonattest controls consulting and formal or co-sourced internal-audit support.For a defined management question or additional capacity within an internal-audit function.
How we work
Coordinated support. Clear professional accountability.
Coordinated capabilities
When appropriate, we consider accounting, business tax, readiness, transaction, and internal-control needs together.
A scope built around the business
We define the work around the company’s priorities, timing, existing team, and other professional advisers.
Clear service boundaries
External audits remain separate.
John W. Halloran CPA, P.C. does not perform external financial-statement audits. Audit Readiness helps management prepare for an audit performed by a separate CPA firm. Controls and internal-audit work may be scoped as nonattest controls consulting or formal or co-sourced Internal Audit. Neither mode produces an external financial-statement audit, review, compilation, or other attest report.
Start a conversation
Tell us what is changing.
Share the business, ownership, or family tax context, your priorities, and timing. We’ll review the situation and discuss whether our services fit what you need.