Cassilly & Appel is a Severna Park, MD accounting firm serving business owners, executives, and independent professionals. The firm provides accounting services, bookkeeping services, payroll support, and tax planning for clients who need organized financial and tax support.

Its listed services include QuickBooks/Xero setup, small business accounting, business consulting, new business formation, and help with bank financing, business valuation, and succession planning. Cassilly & Appel also lists tax resolution support for IRS notices, audit representation, non-filed returns, back taxes, payroll tax problems, liens, levies, wage garnishment, offers in compromise, payment plans, and innocent spouse relief.