Clarity
Numbers you can read and act on.
Why we started ABP
Auxiliary Business Partners started with friends who needed help. People we knew were running businesses and managing their own finances while getting little attention from the firms they paid. Between us, we’ve spent years at public accounting firms of every size, from small local practices to a global firm, and seen how often clients get handed off, left waiting for answers, or treated like one more return in the pile.
So we built the firm we’d want to hire: two CPAs who handle every account ourselves, explain things in plain language, and answer the phone. We’re based in Brooklyn and work virtually, so we can serve clients across New York and beyond, in Russian, Mandarin, and Tagalog.
Let us take the back office off your plate.
Our mission is to be more than accountants. We are partners in your journey. With clarity, confidence, and expertise, we help you stay audit-ready, embrace growth, and navigate the most complex tax challenges with ease.
Compliance
Filings and records kept in order.
Confidence
Decisions backed by a CPA you can reach.
Joseph Asvyansky, CPA
Co-Founder & Partner
Joseph Asvyansky, CPA
Joseph Asvyansky is a Certified Public Accountant licensed in New York and Co-Founder of Auxiliary Business Partners. Over the past decade, he has worked in both public accounting and private industry, in roles ranging from controller to senior tax manager, advising businesses with revenues from approximately $1 million to $30 million.
His experience spans individual and business taxation, tax planning, IRS and state representation, and international tax. He has guided clients through complex domestic and cross-border reporting requirements and represented them before taxing authorities. That breadth allows him to handle both day-to-day compliance and the larger decisions that shape a client’s tax position.
Joseph works with service businesses, professional practices, real estate owners and investors, technology companies, entrepreneurs, and individuals in the entertainment and creative industries, in both English and Russian. His focus is on understanding the full financial picture and providing practical advice that considers both the business and personal sides of a client’s finances.
Outside of his practice, Joseph tutors students in mathematics and history and enjoys playing chess.
Carlos Alfiler, CPA
Co-Founder & Partner
Carlos Alfiler, CPA
Carlos Alfiler is a Certified Public Accountant licensed in Virginia and Co-Founder of Auxiliary Business Partners. He has spent more than 14 years in public accounting at firms ranging from small practices to Mazars, a global accounting firm, reviewing and verifying financial statements so business owners, lenders, and investors can trust the numbers.
His experience covers many sides of the business. He has managed finances for a trade association, run the books as an outsourced controller for growing companies, and helped businesses adopt new accounting technology at a tech startup. That range means he understands both what the numbers say and how they get there.
Carlos works with entrepreneurs, creative professionals, entertainers, specialty trades, professional service firms, medical practices, and individuals with complex finances, in both English and Tagalog. His focus is on protecting the people who build businesses and giving them the clarity and structure they need to grow with confidence.
Carlos also serves as Treasurer of the National Federation of Filipino American Associations (NaFFAA), New York Chapter, where he supports financial education and stewardship for the Filipino-American community.