The Best Construction & Contractor CPA Firms in New Jersey (2026): An Honest Comparison

Who wrote this — and why you should still trust it. This guide is published by ProAxis Tax & Accounting Services, a licensed CPA firm in Bergen County with a contractor practice. Yes, we include ourselves. The deal: every firm below is real, independently established, and described only with facts from its own public materials. We say who each firm is best for — including when that is not us. No firm paid to be listed.

Construction is the industry where good accounting shows up directly in the bid. Job costing, WIP schedules, retainage, and bonding requirements are not bookkeeping details. They decide which jobs you take and what a surety will let you carry.

This guide compares six NJ firms that publicly specialize in construction. Each gets an honest “best for” lane. Pick by how you work, not by who is closest.

How we chose

• Construction depth. A dedicated construction practice or service line — not one line in a services list.
• Fit by contractor type. A two-truck trade contractor, a bonded GC, and a residential builder need different firms.
• Verifiable claims. Everything below comes from each firm’s own website, checked July 26, 2026.
• New Jersey presence. Every firm here has a New Jersey office and serves NJ contractors.

Quick comparison

1. ProAxis Tax & Accounting Services — best for small and growing contractors

Our firm. See the disclosure at the top — judge us by the criteria.

ProAxis runs contractor finances as one system. You get job-level costing, so each job’s true margin is visible monthly. WIP tracking, retainage, and field-crew payroll sit in the same set of books. The firm is licensed in New Jersey and New York, which matters when your crews cross the Hudson. Bookkeeping pricing is published openly rather than quoted on request.

On compliance, ProAxis works through the part that generates the most NJ assessments: sales tax on materials versus labor, including capital-improvement certificates. Entity structure gets reviewed too, since many contractors outgrow their original setup — see S-Corp vs LLC in NJ.

Choose ProAxis if: you run up to a few dozen jobs a year, want to see job margin monthly, and want the sales tax question settled before an auditor asks. Look elsewhere if: you need reviewed or audited statements for a surety (see RMG or D.F. O’Brien).

2. D.F. O’Brien & Co. — best for bonded contractors and design firms

D.F. O’Brien & Co. in Fairfield publicly describes a four-decade focus on construction accounting. Its published services include job costing and WIP reporting, GAAP financial statements, bonding support, PTET and multi-state tax, payroll and 1099 compliance, and IRS resolution.

The firm states it serves general contractors, subcontractors and trades, engineering firms, and architectural practices. Retainage, percent-complete reporting, and bonding requirements are named explicitly in its own materials.

Choose D.F. O’Brien if: you bond work, or you are a design professional wanting a firm whose whole practice is construction.

3. RMG CPA LLC — best for contractors needing assurance and backlog analysis

RMG CPA LLC in Livingston publishes assurance, tax, and advisory services for construction. The firm states that a member of its team holds the Certified Construction Industry Financial Professional (CCIFP®) designation — a construction-specific credential few NJ firms advertise.

Its stated client base spans the industry: general contractors, subcontractors, heavy highway and utility contractors, electrical, plumbing and HVAC trades, developers, and specialty contractors. WIP analysis, backlog forecasting, and profit-fade analysis are named on its construction page.

Choose RMG if: you need reviewed or audited financial statements, or your backlog has grown past what a spreadsheet can track honestly.

4. Belbol & Associates — best for Bergen-local builders and developers

Belbol & Associates in Oradell publishes a construction service line covering outsourced bookkeeping, cash flow monitoring, budgeting and forecasting, payroll, tax planning and contractor returns, plus CFO and controller services and QuickBooks support.

The firm states it works with builders, general contractors, developers, and other construction-related businesses.

Choose Belbol if: you want a Bergen County office you can sit down in, with controller-level help alongside the tax return.

5. Magone & Company, P.C. — best for residential builders and trades

Magone & Company in Parsippany publishes accounting, bookkeeping, and tax planning built for construction. Named services include job estimating and costing, fixed asset accounting and depreciation tracking, month-end and year-end closings, cash flow management, payroll, and QuickBooks support.

The firm states it serves all facets of construction, including residential home builders, contractors, local tradesmen, and commercial construction companies.

Choose Magone if: you build or remodel homes, or run a trade business that wants estimating and costing tightened up.

6. Cg (Cowan, Gunteski & Co.) — best for shore-market contractors

Cg, operating as Cowan, Gunteski & Co., P.A. and Cg Advisory, LLC, has offices in Tinton Falls and Toms River. Its construction page publishes construction business consulting, financial reporting, profit enhancement, and tax compliance and planning, along with restructuring and internal control evaluation.

The firm notes that team members are members of the Utility Transportation and Contractors Association.

Choose Cg if: you work the Monmouth and Ocean shore market and want consulting and internal controls alongside compliance.

How to actually decide

Ask every candidate three contractor-specific questions. Will I get a margin figure per job, or one company-wide P&L? Walk me through my WIP schedule and tell me which jobs are overbilled. How do you handle NJ sales tax on a capital improvement versus a repair? Firms without a construction practice answer all three vaguely.

Timing matters more than cleverness here. WIP is a monthly discipline, not a March exercise. Bonding capacity is decided on statements prepared before you need the bond. If a firm only calls you at tax time, none of the above is on the table.

For the broader vetting framework, see How to Choose a CPA in Bergen County NJ and our county-wide comparison of the best CPA firms in Bergen County. Building outside North Jersey? See our statewide guide to the best NJ CPA firms for small and mid-size companies, compared region by region. For what contractor bookkeeping covers month to month, see Bookkeeping for Contractors. For fee benchmarks by return type, see CPA cost in NJ.

Frequently asked questions

Who is the best construction CPA in New Jersey?

It depends on your size and whether you bond work. For small and growing contractors, ProAxis Tax & Accounting Services (Bergen County, 100% virtual) is a strong fit. That fit applies to contractors who want monthly job-cost books and NJ sales tax handled correctly. For bonded contractors and design firms, D.F. O’Brien & Co. in Fairfield has focused on construction for decades. For contractors who need audited or reviewed statements, RMG CPA LLC in Livingston has a team member holding the CCIFP designation. Match the firm to your bonding and reporting needs. Disclosure: this guide is published by ProAxis, with comparison criteria stated openly on the page.

How much does a construction CPA cost in NJ?

Most contractors pay for two things: monthly bookkeeping and annual tax work. Job-cost bookkeeping typically runs $400 to $700 per month for a small contractor under $500K in revenue. For a growing business between $500K and $2M, it runs $700 to $1,400. Contractors needing reviewed or audited financial statements for bonding pay more, because assurance work is a separate engagement. These are typical published ranges, not an offer; final fees are scoped during an engagement.

Why do contractors need a WIP schedule?

A work-in-progress schedule compares what you have billed on each job to what you have actually earned. It is how you find out whether a job is overbilled or underbilled before the job closes. Sureties and banks require a WIP schedule for bonding and credit decisions. Contractors without one usually discover a fade in profit only after the job is finished, when nothing can be done about it.

Does a small contractor really need a construction-specialist CPA?

Once you run more than a few jobs at a time, usually yes. The differences are concrete. You get job-level costing, so you can see which work actually pays. Retainage is treated correctly. Percentage-of-completion and completed-contract methods are chosen deliberately. NJ sales tax is split correctly between materials and labor. A generalist preparer files what happened. A construction CPA changes what happens on the next bid.

How is NJ sales tax handled on construction work?

New Jersey treats contractors differently from retailers. In most cases the contractor pays sales tax on materials as the end consumer. Labor on a capital improvement can be exempt. That exemption depends on a properly completed certificate from the customer. Repair and maintenance work is treated differently from a capital improvement. Getting this wrong is one of the most common sources of NJ contractor audit assessments, so the certificate paperwork matters as much as the return. Our NJ contractor sales tax guide walks through the certificates.

This guide is general information, not tax, legal, or accounting advice, and does not create a CPA-client relationship. All third-party firm information comes from public sources — each firm’s own website — as of July 26, 2026, and may change. We are not affiliated with, and received no compensation from, any firm listed. All trademarks and firm names belong to their owners. Verify any firm’s license at CPAverify.org or through the New Jersey Division of Consumer Affairs.