A Plus Tax MD LLC helps individuals and small businesses file accurately, keep clean books, and stay audit-ready — with documentation that holds up when it matters.
From a single 1040 to multi-year business catch-up, with the records to back every number.
Individual and business returns — Schedule C, partnerships, S-corps, and multi-state filings prepared accurately and on time.
QuickBooks Online setup, cleanup, and monthly bookkeeping so your financials are always current and reconciled.
Audit-ready substantiation packets and representation support — we reconstruct and defend your records line by line.
Payroll processing, W-2s, 1099-NECs, and the quarterly/annual filings that keep you compliant.
Entity formation, EIN, S-election guidance, and getting your books and tax structure right from day one.
Behind on filings? We reconstruct prior years, file catch-up returns, and request penalty abatement where you qualify.
Audit defense is our specialty. We don't just file — we build the documentation trail behind every deduction, so a notice is a non-event instead of a crisis.
A Plus Tax MD LLC is a Maryland-licensed tax and accounting practice led by Sergio Adantor, serving individuals and small businesses across the state and beyond.
We pair careful, accurate tax preparation with disciplined bookkeeping and a security-minded approach to your data — so your return is right, your books are clean, and your records can stand up to scrutiny.
Whether you're filing your first return, cleaning up years of back filings, or defending an audit, you get a preparer who treats your numbers like they're under a microscope — because sometimes they are.
Securely connect your QuickBooks Online so we can handle your bookkeeping & tax prep.
Book a consultation or reach out — individual or business, current year or catch-up, we'll tell you exactly where you stand.
107 Mountain Rd, Suite U, Pasadena, MD 21122 · By appointment