S.J. Dennen, CPA, P.C. is a CPA accounting firm based in North Andover, MA, serving individuals and businesses with tax and accounting support. The firm describes its work as full-service accounting and financial guidance, with services ranging from basic tax management and accounting to more involved assurance work.

Its listed services include business tax preparation, bookkeeping, payroll, sales tax, tax planning, IRS notice and audit help, and new business formation. The firm also references audits, reviews, and compilations, along with online tax and financial resources such as forms, calculators, tax tips, financial guides, and news.

For clients who need operational accounting support, the profile facts also identify QuickBooks as a supported software tool. The available source text positions the firm as working with both local clients and clients throughout the United States.