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Home/Industries/E-commerce & Retail
E-commerce accounting · Shopify · Amazon · Inventory · Sales tax nexus · CPA firms

E-commerce accounting where high transaction volume demands systematic accuracy — not manual heroics.

E-commerce clients generate more transactions per month than most other business types combined. Shopify payouts don’t match bank deposits. Amazon holds funds, charges fees, and remits at irregular intervals. Pair platform expertise with bookkeeping, AP/AR management, or see the full offering for CPA firms.

Discuss your e-commerce clients For CPA Firms →
Platform expertise

The three platforms your e-commerce clients are most likely using.

Each platform has its own payout structure, fee model, and reconciliation logic. knowing how to reconcile a Shopify payout is not the same as knowing how to reconcile an Amazon Seller Central account — or a Stripe payment processor. we know all three.

Primary platform
Shopify
Shopify payouts do not equal gross sales. fees, refunds, adjustments, and timing differences mean the payout your client receives in their bank never matches their Shopify dashboard. we reconcile every payout to the transaction level.
Payout-to-bank reconciliation
Shopify Payments fee reconciliation
Refund and chargeback tracking
Sales tax collected vs remitted reconciliation
A2X / Reconcile integration support
Marketplace
Amazon Seller Central
Amazon holds funds, charges FBA fees, collects sales tax in some states, and remits bi-weekly at amounts that require detailed reconciliation to the settlement report. every line of an Amazon settlement report has accounting implications.
Settlement report reconciliation
FBA fee categorisation and tracking
Amazon-collected sales tax reconciliation
Inventory reimbursement tracking
A2X integration for QBO and Xero
Multi-channel
Multi-platform sellers
Many e-commerce clients sell across Shopify, Amazon, Etsy, eBay, and their own website simultaneously. consolidated P&L that aggregates revenue and COGS across all channels while maintaining channel-level visibility requires deliberate accounting architecture.
Channel-level revenue tracking
Consolidated COGS and margin reporting
Inventory valuation across channels
Stripe, PayPal, Square reconciliation
WooCommerce and BigCommerce support
E-commerce accounting specifics

The accounting challenges e-commerce clients create that generalist bookkeepers get wrong.

High transaction volume is the surface-level challenge. the specific problems that cause accounting errors in e-commerce are more granular than that — and they repeat every month if they’re not solved at the process level.

COGS calculation requires inventory tracking — not just expense coding
When a product sells, the cost of that specific product needs to move from inventory to cost of goods sold. a bookkeeper who codes every supplier invoice to "purchases" produces financials that show profit or loss at the wrong time — and fails Schedule C or the business return.
Refunds and chargebacks need to reverse revenue and adjust COGS
A refund isn't just a negative payment. the revenue needs to reverse, the returned inventory may need to be reinstated, and the payment processor fees associated with the original transaction may be partially recoverable. most bookkeepers record only the cash movement.
Shipping costs can be revenue, expense, or both simultaneously
If the client charges customers for shipping, that's revenue. what they pay the carrier is an expense. the net — and whether the client profits or losses on shipping — needs to be tracked separately for margin analysis. many bookkeepers net these without thinking.
Advertising spend needs channel attribution, not bulk categorisation
Facebook Ads, Google Ads, Amazon Sponsored Products, and TikTok spend all look like "advertising expense" in a bank feed. but a client trying to understand which channel drives profitable revenue needs advertising costs tracked by platform — and ideally reconciled against the revenue that platform generated.
Sales tax nexus

Economic nexus has made sales tax the most complex compliance issue for e-commerce clients.

Since South Dakota v. Wayfair (2018), economic nexus means e-commerce sellers can trigger sales tax obligations in states they’ve never physically operated in. most e-commerce clients don’t know which states they’ve crossed the threshold in — until their CPA tells them.

We track economic nexus thresholds across all 50 states and flag when your clients’ transaction volumes approach registration requirements. sales tax returns are prepared and filed through your preferred provider — TaxJar, Avalara, or manually.

Sales tax compliance service →
Common economic nexus thresholds
Most states (standard)$100k revenue OR 200 transactions
California$500k revenue
New York$500k revenue AND 100 transactions
Texas$500k revenue
Florida$100k revenue
Amazon marketplace facilitatorAmazon collects — verify coverage
Note on AmazonAmazon acts as a marketplace facilitator and collects sales tax in most states on behalf of sellers. but sellers may still have filing obligations in states where Amazon doesn’t collect — and the intersection of FBA inventory location and nexus rules creates additional complexity.
Full service scope

Everything we handle for your e-commerce CPA firm clients.

01
Platform reconciliation
Shopify, Amazon, and multi-channel payout reconciliation to bank statements. every settlement report broken down to the transaction level.
02
Inventory & COGS tracking
Perpetual inventory costing using FIFO, LIFO, or weighted average. COGS calculated accurately as products sell — not when suppliers are paid.
03
Sales tax nexus monitoring
Economic nexus threshold tracking across all states. registration triggers flagged before your client is non-compliant. returns prepared through TaxJar or Avalara.
04
Channel P&L reporting
Revenue, COGS, advertising, and fulfilment costs broken down by sales channel. gross margin by channel and by product category for management reporting.
05
Payment processor reconciliation
Stripe, PayPal, Square, and Klarna reconciled against deposits. fees, holds, and payout timing differences tracked and posted accurately.
06
Monthly close & tax prep support
Full month-end close package. inventory counts reconciled. financials formatted for your review and Schedule C or business return preparation.
07
Refund & chargeback processing
Every refund and chargeback posted correctly — revenue reversal, potential inventory reinstatement, and processor fee recovery where applicable.
08
Integration setup & maintenance
A2X, Synder, and other platform-to-QBO/Xero integration setup and ongoing maintenance. clean data in your accounting platform from the start.
Other industries
Real EstateHealthcareConstructionNonprofitsProfessional Services

E-commerce clients deserve accountants who understand their platforms — not just their bank feeds.

Book a call and describe your e-commerce client base. We'll walk through exactly how we handle the platform reconciliation, COGS, and sales tax nexus for their specific setup.

Book a discovery call

Or email us directly at accounting@nimblechapps.finance — no forms, no bots.