Accounts Payable Services & AP Automation Providers in Fairfax, VA

Rubin, Koehmstedt & Nadler, known as RKN CPA, is a certified public accounting practice in Northern Virginia with offices in Fairfax and Leesburg. The firm works mainly with small and mid-sized companies, closely held service businesses, and individuals, including high net worth households. Buyers looking for accounts payable support should see RKN as a full-service CPA firm rather than a stand-alone AP automation vendor. It combines day-to-day financial operations with tax and advisory work.

Accounting and AP-related services

RKN's accounting practice centers on outsourced bookkeeping and accounting for companies that prefer not to keep a full finance department in-house. Its website has no dedicated accounts payable page, so prospective clients should confirm directly how payables are handled. The relevant offerings sit within its broader accounting lineup:

• Outsourced accounting and bookkeeping
• Small business accounting
• QuickBooks setup and support
• Financial statement preparation
• Outsourced CFO services
• Payroll services

The firm presents this work as a way to help owners keep tabs on spending, control cash flow and build budgets tied to their goals. It also advises on larger decisions, such as adding staff or making major purchases.

Tax and advisory work

RKN prepares individual, business, multi-state, trust and estate, and nonprofit (Form 990) returns. It also offers year-round tax planning, retirement plan advisory and IRS problem resolution. Its state and local tax practice handles Virginia-specific issues, including:

• Sales and use tax and franchise tax
• Nexus filings and property tax
• State audit support
• Incentive analysis

Advisory services cover business planning, succession planning, entity structure selection and tax efficiency reviews.

Industries and team

The firm highlights experience with technology companies, construction businesses, government contractors, law firms, real estate and medical practices. Its team includes:

• Clint Thomas, practice leader, a CPA and Certified Valuation Analyst with more than three decades in the profession. He focuses on government contractors, tech firms and service businesses, and also takes on valuation, expert testimony, mergers and acquisitions, and international tax matters.
• Jesse Wetherington, Jr., a CPA with an MBA, who has been with the firm since 1993 after earlier controller roles.
• Kathleen Ecott, an Enrolled Agent with more than 30 years in accounting across for-profit and nonprofit organizations, who concentrates on accounting and return preparation.
• Zachary Bucklen, a CPA who joined in 2024 and previously ran an internal audit team at Verizon.
• Jessica Burkett, a CPA who joined in 2025, has helped clients streamline their bookkeeping and serves farming-related businesses.

New clients start with an initial consultation offered at no charge. The firm provides a secure file-sharing tool, a client dashboard and online payment options. Its stated approach stresses listening to each client's particular situation, responding promptly and having the team review every engagement together. RKN suits Virginia companies that want payables, bookkeeping and tax compliance handled by one CPA group. Organizations looking for dedicated AP automation software should note that the firm does not advertise any such product.