E-Commerce & Amazon Seller Services
Selling online creates a web of compliance obligations that most sellers do not fully understand until they receive a notice. From sales tax nexus across dozens of states to multi-channel bookkeeping and cross-border sourcing, we provide the financial infrastructure that e-commerce businesses need to operate with confidence.
Free. No commitment. We assess your situation in 15 minutes.
In short: We handle accounting and tax for e-commerce and Amazon sellers: sales tax nexus analysis, multi-state registrations, marketplace bookkeeping, and business tax returns. It is for online sellers on Amazon, Shopify, and other channels who want one firm managing both their sales tax exposure and their federal income tax compliance.
What's Included
- Marketplace and multi-channel bookkeeping
- Sales-tax nexus review and filings where you have obligations
- The business income tax return
Timeline: Books on a monthly cadence; sales-tax and returns on their filing schedules.
Not included:
- Sales-tax registration in each new state (billed separately)
- A standalone nexus study (separate)
- Foreign-owned entity Form 5472 unless added
Financial Compliance Built for Online Sellers
E-commerce businesses face a unique set of financial challenges. Revenue flows through multiple platforms, each with its own fee structure and reporting format. Sales tax obligations shift as your customer base grows and your inventory moves between fulfillment centers. Cost of goods sold calculations require tracking inventory across suppliers, warehouses, and returns.
Without a structured approach to these challenges, online sellers often find themselves with inaccurate financial records, unregistered sales tax obligations, and tax returns that do not reflect the true profitability of their business. The cost of correcting these issues after the fact is always higher than managing them proactively.
Our e-commerce services are designed to address these specific challenges. We integrate data from your sales platforms, manage your sales tax compliance across all states where you have nexus, and maintain bookkeeping that gives you a clear picture of your actual margins and profitability.
Platforms We Support
- Amazon (FBA and Merchant Fulfilled)
- Shopify and Shopify Plus
- eBay
- Walmart Marketplace
- Etsy
- WooCommerce
- BigCommerce
- Custom e-commerce platforms
Sales Tax Compliance for Online Sellers
The Supreme Court's 2018 Wayfair decision fundamentally changed sales tax obligations for online sellers. If you sell to customers in multiple states, you likely have nexus in more states than you realize.
Nexus Analysis
$500
We analyze your sales data, FBA warehouse locations, and business activities to determine every state where you have sales tax nexus. The analysis includes a detailed report of your obligations and a prioritized registration plan.
Registration
$150/state
We handle the sales tax permit registration process in each state where you have nexus. This includes completing the application, obtaining your permit number, and setting up your filing schedule with each state.
Ongoing Filing
$150/state/filing
We prepare and file your sales tax returns on the required schedule (monthly, quarterly, or annually depending on the state). This includes reconciling marketplace-collected tax with your filing obligations.
The E-Commerce Shield
A comprehensive monthly retainer designed specifically for e-commerce businesses. Everything you need to maintain clean financial records, stay compliant with sales tax obligations, and understand your true profitability across all channels.
What Is Included
- Monthly bookkeeping with marketplace integration
- Multi-channel revenue reconciliation
- Cost of goods sold tracking
- Sales tax filing for up to 5 states
- Quarterly financial statements
- Annual business tax return
- Quarterly strategy calls
- Annual tax planning session
Monthly Retainer
$1,275/month
Annual Prepayment (10% savings)
$13,770/year
Save $1,530 annually
Amazon Seller Bookkeeping
Amazon sellers face unique bookkeeping challenges. Between FBA fees, storage costs, returns, reimbursements, and advertising spend, understanding your true profitability requires specialized knowledge of the Amazon ecosystem.
Revenue Reconciliation
We reconcile your Amazon settlement reports with your bank deposits to ensure every dollar is accounted for. This includes tracking the difference between gross sales, Amazon fees, refunds, and net deposits.
Fee Analysis
Amazon charges dozens of different fees, from referral fees and FBA fulfillment fees to storage fees and advertising costs. We categorize and track every fee so you understand exactly where your money is going.
COGS Tracking
Accurate cost of goods sold is essential for understanding your margins. We track inventory costs from purchase through sale, including landed costs for imported goods, and calculate your true per-unit profitability.
Reimbursement Tracking
Amazon owes sellers reimbursements for lost, damaged, and destroyed inventory more often than most sellers realize. We track your reimbursement claims and ensure they are properly recorded in your books.
Foreign-Owned U.S. LLCs on Amazon
Many overseas founders open a U.S. LLC to sell on Amazon, and the compliance side is easy to overlook at setup. A foreign-owned single-member LLC is usually a disregarded entity that must file Form 5472 with a pro-forma Form 1120 every year it has a reportable transaction, even with no U.S. income. The penalty for filing it late is $25,000 per form, so it is worth handling on time.
Form 5472 + 1120
The annual information return every foreign-owned U.S. LLC owes. We prepare it on time and track your filing calendar so the deadline is not missed. Standalone preparation is $1,800.
Sales Tax From FBA Inventory
Storing inventory in U.S. FBA warehouses can create physical nexus regardless of where you live. We run the nexus analysis and handle registrations and filings in the states where you have obligations.
ETBUS & Effectively Connected Income
Whether your selling activity is effectively connected to a U.S. trade or business changes what you owe. We look at your facts and explain the position plainly before anything is filed.
One Membership, One Relationship
Books, sales tax, and the annual foreign-owned filings sit with one Enrolled Agent instead of scattered across a formation platform and a spreadsheet. Your records stay yours and move with you if you ever leave.
Cross-Border E-Commerce Compliance
If you sell internationally or source products from overseas, your compliance obligations extend beyond domestic sales tax. We coordinate with our international tax practice to ensure full coverage.
Import Duties & Customs
Proper classification and documentation of imported goods, including landed cost calculations for accurate COGS.
International Entity Structure
Guidance on entity structure for sellers with operations in multiple countries, including transfer pricing considerations.
VAT & GST Compliance
Coordination with international tax advisors for VAT/GST obligations in countries where you sell directly to consumers.
Arc & Ledger is an accounting and tax advisory firm. We are not a law firm and do not provide legal advice. For all legal matters including operating agreements, liability protection, intellectual property, and immigration, we recommend consulting a licensed attorney.
Frequently Asked Questions
Common questions about this service area.
Related Guides
Learn more about this topic with our in-depth guides.
Do Non-US Sellers Owe US Tax?
Income tax, Form 5472, and sales tax nexus for non-resident Amazon and e-commerce sellers.
Read GuideLLC vs. S-Corp Comparison
Compare entity structures to find the optimal tax setup for your e-commerce business.
Read GuideU.S. Tax Compliance Guide
Critical compliance information for online sellers including sales tax, Form 5472, and ETBUS rules.
Read GuideRelated Services
Explore other ways we support our clients.
Business Tax & Compliance
Annual business tax return preparation for your e-commerce entity, including entity selection guidance.
Learn MoreBookkeeping & Monthly Accounting
Standalone bookkeeping services if you need financial record management outside the E-Commerce Shield.
Learn MoreCross-Border & International Tax
International compliance for e-commerce businesses with cross-border operations or foreign sourcing.
Learn MoreGet Your E-Commerce Finances Under Control
Submit your information and we will assess your sales channels, nexus exposure, and recommend the right level of support for your online business.
“Arc & Ledger provided exceptional service, making my tax preparation seamless and stress-free.”– Christian S., Google Review
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