A CPA firm built for multi-channel selling
Get one clear financial picture across every channel you sell on, from Amazon to Etsy
Quick answer
Berg Advisors provides e-commerce CPA services for Amazon, Shopify, Walmart, eBay, and Etsy sellers, including multi-channel bookkeeping, accrual-based accounting, inventory costing, and multi-state sales tax nexus advisory. The firm works on a flat monthly fee rather than hourly billing for product-based businesses expanding into new states and sales channels.
Amazon, Shopify, Walmart, eBay, and Etsy sellers need an accounting firm that specializes in e-commerce. The team at Berg Advisors knows what a settlement report looks like, why FBA reimbursements matter, and how cost of goods sold gets calculated when inventory sits in three different warehouses at once.
With more than 30 years of combined CPA experience, our team work withs product-based businesses, from single-channel Shopify shops to sellers running Amazon, Walmart, and Etsy storefronts side by side. As a virtual firm working with sellers in all 50 states, geography never limits who gets access to this expertise.
Solving the multi-channel reconciliation headache
Every marketplace exports data differently. Amazon settlement reports bury fees inside multi-week batches. Shopify mixes gross sales with discounts and shipping income. Walmart, eBay, and Etsy each format payouts their own way, and reconciling all of it by hand eats a weekend every month.
Berg Advisors builds one unified ledger from every channel you sell on, so gross revenue, marketplace fees, refunds, and shipping costs land where they belong instead of getting lumped into "miscellaneous." Your P&L ends up reflecting what each channel earns, not a blended guess.
Once the numbers reconcile, the real question gets easier to answer: which channel, product, or SKU is making money. That's the conversation this firm has with clients every quarter, not just once a year at tax time.
Accrual accounting and inventory done right
Berg Advisors works directly with growing product businesses moving from cash-basis to accrual accounting, the shift banks and investors expect once a company outgrows its founder's personal checking account. That includes proper inventory costing, so landed costs, freight, and per-unit COGS show up correctly instead of getting expensed the day a container clears customs. We'll provide a complete picture of your financials, so you always have accurate numbers on hand.
Multi-state sales tax nexus without the guesswork
Selling on Amazon FBA alone can create sales tax nexus in a dozen states before you've shipped a single order there yourself, because inventory sits in fulfillment centers you don't control. Add a warehouse in a new state, cross an economic nexus threshold, or launch on a new marketplace, and the filing requirements shift again.
Berg Advisors guides product-based businesses with advice on nexus exposure as they expand, so there is a plan in place when growth happens.
Nexus review across every state you sell into, based on inventory location and revenue thresholds
Registration and filing setup handled ahead of time, not after a state sends a notice
Ongoing monitoring as thresholds change or new states get added to your footprint
Marketplace facilitator law guidance, so you know what Amazon and Walmart already collect on your behalf
Accounting, tax, and advisory under one roof
Bookkeeping without tax planning misses savings. Tax prep without ongoing bookkeeping means surprises every April. Berg Advisors runs both under one flat monthly fee, plus the advisory layer that connects them.
Bookkeeping and accounting
Monthly close, bill pay, bank and credit card reconciliations, and channel-level financial reporting built for multi-platform sellers.
Business and personal tax
Business tax preparation, personal returns, year-end 1099s, and tax planning that accounts for inventory and multi-state exposure.
Strategic advisory
Quarterly strategy calls, cash flow management, and budget review built around your growth plans, not just year-end cleanup. [Learn about advisory](/services/advisory) Every engagement includes a mutual success plan, so you know upfront what's covered and what a quarter of work with this firm looks like.
Frequently Asked Questions About Best E-Commerce CPA Services for Online Businesses
Let's talk about your online business
Whether you're running a single Shopify store or juggling Amazon, Walmart, eBay, and Etsy storefronts at once, your numbers should tell you something useful. Berg Advisors works with sellers by video call and shared dashboards, wherever your business is registered.
Schedule a consultation to talk through where your books stand today and what a flat monthly fee looks like for a business like yours.
Why clients trust us
- Berg Advisors advises product-based businesses on multi-state sales tax nexus and accrual conversion accounting
- Woodard Top 50 Accounting Firm recognition
- Intuit Firm of the Future recognition
- Canopy 2021 Innovation Award Finalist
- More than 30 years of combined CPA experience across the firm
- Andrew C. Berg, CPA, featured on the Profit First Professionals podcast discussing modern accounting firm operations