Your Business,
Your Finances,
Done Right.
We specialize in premium bookkeeping and Fractional CFO services designed for female founders of service-based and Shopify & Amazon e-commerce businesses.
Our clients see an average revenue increase of 20-30% within the first year of CFO services.
Our monthly review process ensures 99% accuracy in financial reporting.
Our clients report a 84% improvement in their financial understanding.
On average, our clients reclaim 10-15 hours a month that they used to spend on their bookkeeping.
What We Can
Do For You
Financial Confidence Starts Here
BACK ON TRACK
One-time bookkeeping clean-up to bring clarity and control back to your finances.
Whether you’re months (or years) behind, we’ll update, organize, and reconcile your books so you can stop stressing and start fresh with confidence.
FRACTIONAL CFO
Strategic financial leadership to give you clarity and direction.
We handle your bookkeeping and provide advanced cash flow forecasting, reporting, and actionable insights to help you make smarter, data-driven decisions for your business.
MONTHLY BOOKKEEPING
Premium monthly bookkeeping that keeps your numbers organized.
We’ll manage your books with precision and care every month, giving you clear, reliable financials that guide your decisions and fuel your business’s success.
Why Work With Us
At Harmonic Accounting, we do more than crunch numbers—we make sure you actually understand them. Here’s what sets us apart:
Fast, Clear Communication
No waiting days for a response. We’re here when you need us.
Your Numbers, Made Simple
Confused by financial reports? Not anymore. We break it down so you get it.
Specialists in Your Industry
We know service-based businesses and Shopify & Amazon e-commerce inside and out.
Precision You Can Trust
Accurate, organized financials that let you focus on what you do best—growing your business.
Harmonic Accounting started with a vision: financial harmony & clarity.
Founded by Lotte Leussink, a passionate advocate for female entrepreneurs, the firm was born out of a frustration — the lack of clear, ongoing financial guidance for business owners beyond monthly bookkeeping. She saw the need not just for number crunching and organization, but for consistent communication, support, and education.
Today, Harmonic Accounting is supported by a small, trusted team that helps ensure each client receives timely responses, accurate books, and thoughtful financial insights. This client-focused approach has empowered over 100 female entrepreneurs over the past 8 years to not only better understand their numbers, but to use them confidently — making informed decisions, fueling growth, and cultivating balance and harmony in their businesses.
Based in NYC, Harmonic Accounting supports service-based businesses, e-commerce brands, and select music nonprofits across the United States.
