Virtual Accounting & Tax Strategy for E-commerce Businesses (US-based)
Clean books across every sales channel, inventory and COGS tracking, sales tax support and year-round tax strategy, executed monthly, not scrambled at year-end.

Inc. 5000 company
4x
Recognized as one of the fastest-growing private companies four times.


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Accurate margins on every channel and a tax strategy that runs all year
Accurate margins on every channel, and a documented tax strategy executed monthly, not scrambled together at year-end.
With Anomaly, you get clean, organized financials that track inventory, margins and sales across every channel, plus a documented tax strategy executed monthly instead of rushed at year-end. We handle bookkeeping across marketplaces and storefronts, inventory and cost of goods sold, and the tax planning that matters for online stores: sales tax compliance across states, multi-state exposure, entity structure and quarterly estimated taxes. The result is accurate margins, fewer surprises at tax time, and the confidence that your books and tax strategy are working together as your store scales.
4x
Inc. 5000 company
#1
Tax Strategist in the U.S.
200
Forbes top CPA firms
What we do for e-commerce businesses
Channel-level bookkeeping, inventory and COGS tracking, sales tax support and proactive tax strategy, executed monthly, not scrambled at year-end.
Multi-Channel Revenue
Clean books across your website, marketplaces and payment processors, with fees, refunds and payouts matched to sales.
Inventory & COGS
Inventory valuation and cost of goods sold you can rely on, so margins reflect what you actually paid for stock.
Sales Tax & Nexus
Nexus tracking and multi-state sales tax compliance support, so you register and file where you owe.
Profit by SKU
Margin reports by channel and product, so you know which items and platforms are worth scaling.
Maximizing every dollar with strategic tax planning
Every tax strategy we recommend is built around how online stores operate, from inventory accounting and sales tax to entity structure and multi-state exposure. Here are the four areas we plan for.

Inventory & COGS Strategy
Choose and apply inventory methods that keep margins accurate and taxable income in check.
Sales Tax & Nexus
Track economic nexus thresholds, and register and file where you owe, before small gaps become large liabilities.
Entity & Owner Compensation
Evaluate the right structure and an efficient way to pay yourself as profits grow.
Multi-State & Growth Planning
Manage state filing exposure and plan reinvestment, financing and exit options as the store grows.
Tailored tax solutions for e-commerce businesses
Don't settle for a tax planning process that just skims the surface. We start with a comprehensive review of your store, then deliver high-impact, proactive strategies tailored to your situation.

Identify
We review your channels, inventory model, entity and states to identify the tax strategies that actually apply to your store.
Implement
We build each strategy into your current books and sales systems on the fly, so inventory, sales tax and estimates are tracked month to month.
Report
We make sure every strategy is reported correctly on your returns, with the documentation to support it.
Accounting Services for E-commerce Businesses
Multiple sales channels, marketplace fees, returns, inventory and sales tax across states create a different equation for every online store. Whether you sell on your own site, marketplaces or both, our team brings organized accounting and practical, hands-on insight.
Core Bookkeeping
Monthly close, channel-level revenue and fees, and clean, GAAP-ready financials. Payouts, refunds and chargebacks are reconciled, so your books match your platforms.
Inventory & Fixed Assets
Inventory tracking, COGS, capitalization policies and depreciation schedules, so the stock on hand and your balance sheet agree.
Reporting You'll Trust
Margin reports by channel and product, quarterly reviews and organized documentation. You can see what each channel really earns after fees.
Tailored to Your Goals
Structured around your channels, inventory model and tax strategy, whether you sell on your own site, marketplaces or both.
Fast, Pro Support
A responsive team with fast turnaround, so there is no waiting and no delays during your busiest season.
Pick a Plan That Fits Your Store
Year-round tax strategy and monthly accounting for online stores. Choose one or combine both.
Concierge Tax
Proactive tax strategy built around how online stores operate, from inventory to sales tax nexus.
Dedicated Tax Project Manager
Mid-Year & Year-End Check-In Meetings
Tax Projections & Estimated Tax Payments
Inventory, COGS and sales tax nexus planning
Tax Return Preparation
Core Accounting
Monthly bookkeeping with channel-level revenue and fees, reconciled to your platforms.
Monthly close and reconciliations
Payouts, refunds and chargebacks reconciled
Inventory tracking and COGS
Reporting and dashboard with Concierge accounting, from $800/month
Anomaly CPA’s client victories in the spotlight
Innovative business owners and investors across the globe benefit from our unique tax strategy and cloud accounting experience allowing them to stay ahead of the curve.
Award-winning impact: Recognized excellence in client services
Our team has been recognized for our impact
and services to clients. Recent awards include: Greg O'Brien (3x) and John Malone (2x) as 40 Under 40, AccountingToday Top 10 Firms for Tech, the #1 Tax Strategist of the Year Award by the American Institute of Certified Tax Planners & Forbes Magazine Top 200 CPA Firms.

2025 Forbes Best-in-State Top CPA

2024 Forbes Top 200 CPA Firms

2022 CPA Practice Advisor "40 Under 40" professionals who have emerged as leaders in the profession.

2022 Accounting Today Best Firms for Technology

2021 Concierge Accounting Firm of the Year

2020 AICTC Tax Planner of the Year National Finalist
E-commerce FAQs
Frequently Asked Questions About Accounting & Tax Strategy for E-commerce Businesses
It depends on your entity and your profit. We help you choose a structure and an efficient mix of salary and distributions, and we plan quarterly estimates so your tax bill is predictable.
Yes. We set up your books to track revenue, fees and costs by channel and product, then deliver margin reports you can use to decide what to restock, reprice or drop.
Possibly. Once your sales in a state pass its economic nexus threshold, you may need to register, collect and file there. We track your sales by state and tell you when a threshold is getting close.
We track inventory purchases, landed costs and cost of goods sold so your margins reflect what you actually paid for stock. We also help you choose an inventory method that fits your business and holds up on your tax return.
We bring sales, fees, refunds and payouts from every channel and payment processor into one set of books. Each channel is tracked separately, so you can see what it really earns after fees.
Start with a short intro call. We look at your sales channels, inventory model and current books, then recommend a scope of work and pricing that fits your store.
Guides & insights for e-commerce businesses
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Ready to partner with a virtual CPA for your online store?
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