Amazon FBA Accounting & Tax Guide for Sellers in 2025: What You Must Get Right
Why FBA Accounting Is Harder Than It Looks
Most Amazon sellers underestimate the complexity of their finances. Unlike a traditional retail business, FBA generates dozens of transaction types — refunds, reimbursements, storage fees, long-term storage penalties, co-op charges, advertising costs, and inventory adjustments — all flowing through a single Seller Central account. If you're reconciling this with a spreadsheet or basic bookkeeping software, you're almost certainly leaving money on the table and risking a tax bill you didn't see coming.
This guide covers the financial fundamentals every FBA seller needs to get right: profit tracking, sales tax and VAT compliance, reimbursements, and the tools that make all of it manageable.
Step 1: Track True Profit, Not Just Revenue
Amazon deposits a net amount into your bank account after deducting referral fees, FBA fees, ad spend, and other charges. That number is not your profit. To understand real margin, you need to account for:
- Cost of Goods Sold (COGS) — unit cost, packaging, inbound freight
- Amazon fees — referral, FBA fulfilment, storage, returns processing
- Advertising spend — Sponsored Products, Sponsored Brands, DSP
- Overhead — software subscriptions, prep centre fees, VA costs
- Reimbursements owed — lost or damaged inventory Amazon hasn't paid out yet
Profit analytics tools are essential here. Getida specialises in FBA auditing and reimbursements, automatically identifying discrepancies between what Amazon owes you and what it has paid. Similarly, Refunzo offers lifetime-free FBA reconciliation, catching inventory losses and overcharged fees that most sellers never notice.
For day-to-day P&L tracking, a dedicated Amazon analytics platform will give you SKU-level margin visibility that generic accounting software simply cannot match.
Step 2: Understand Your Sales Tax and VAT Obligations
Tax compliance is the area where FBA sellers most frequently get caught out — especially those selling across borders.
US Sales Tax
Since the South Dakota v. Wayfair Supreme Court ruling in 2018, most US states enforce economic nexus rules. If you exceed a state's revenue or transaction threshold — typically $100,000 in sales or 200 transactions — you are required to collect and remit sales tax there, regardless of where your business is based. Because Amazon stores inventory in fulfilment centres across multiple states, FBA sellers can trigger nexus in states they've never operated in. Key actions:
- Audit which states hold your inventory using Seller Central's fulfilment centre reports.
- Register for sales tax in every state where you have economic or physical nexus.
- Use a tax automation tool (TaxJar, Avalara) or work with a specialist accountant.
If you're a non-US business setting up a US entity to sell on Amazon, Easy Filing simplifies US LLC formation with registered agent services — a critical first step before you can open a US bank account or obtain an EIN for tax purposes.
EU and UK VAT
Selling into Europe through Amazon's Pan-European FBA or Multi-Country Inventory programmes triggers VAT registration obligations in each country where stock is held. The EU's One Stop Shop (OSS) scheme simplifies cross-border B2C reporting for distance sales, but it does not replace local VAT registration where you hold inventory. In the UK, all sellers — domestic and overseas — must register for VAT once taxable turnover exceeds £90,000, or immediately if you use UK fulfilment centres as a non-UK business.
Step 3: Recover FBA Reimbursements Systematically
Amazon's warehousing network processes millions of units daily. Inventory gets lost, damaged, miscounted, or returned in unsellable condition — and Amazon's automated reimbursement system does not catch everything. Studies suggest the average FBA seller is owed between 1–3% of their revenue in unrecovered reimbursements at any given time.
Manual auditing is time-consuming and requires intimate knowledge of Amazon's reimbursement policies. Dedicated tools like Getida and Refunzo automate the entire process: they scan your account transaction history, identify eligible claims, and submit cases on your behalf. Most operate on a success-fee model, so there's no upfront cost.
Step 4: Choose the Right Accounting Stack
No single tool does everything. Most serious FBA sellers use a combination of:
| Need | Tool Type | Examples |
|---|---|---|
| Real-time P&L by SKU | Amazon profit analytics | Sellerboard, QMT |
| FBA reimbursement recovery | Auditing & claims software | Getida, Refunzo |
| Sales tax automation (US) | Tax compliance software | TaxJar, Avalara |
| US entity formation | Legal / formation service | Easy Filing, Startupwala |
| International payments | FX & payment platform | Skydo |
| General bookkeeping | Cloud accounting | Xero, QuickBooks |
QMT is worth highlighting for sellers who want an all-in-one Amazon software suite that combines analytics, inventory, and performance management in a single dashboard — reducing the number of separate subscriptions needed.
For sellers receiving international payouts from Amazon marketplaces in the US, EU, or UK into a non-local bank account, currency conversion fees can silently erode margins. Skydo is designed specifically to make cross-border business payments affordable and transparent for international ecommerce sellers.
Step 5: Monitor Listing and Account Health to Protect Revenue
Financial health and account health are tightly linked. A suppressed listing or a hijacked Buy Box doesn't just hurt sales — it creates gaps in your financial projections and can trigger inventory storage cost spikes if stock stops moving. AMZ Monitor tracks competitor activity, Buy Box changes, and keyword ranking shifts so you can react quickly before financial impact compounds.
Common Mistakes to Avoid
- Treating Amazon payouts as revenue: Always book gross sales and fees separately for accurate margin reporting.
- Missing nexus states: Review your inventory distribution report quarterly — it changes as Amazon rebalances its network.
- Ignoring reimbursement windows: Amazon's reimbursement claim windows are limited (typically 18 months). Delayed auditing means permanently lost money.
- Mixing business and personal accounts: Especially critical for international sellers forming US or UK entities — keep finances cleanly separated from day one.
- Overlooking COGS accuracy: Your profit reports are only as good as the COGS data you feed in. Update landed costs whenever shipping or supplier pricing changes.
Final Thoughts
Getting FBA finances right is not a one-time task — it's an ongoing operational discipline. The sellers who build clean accounting systems early, automate tax compliance, and actively audit for reimbursements consistently outperform those who treat finance as an afterthought. Start with accurate profit tracking, plug reimbursement leaks, and ensure your tax registrations reflect where you actually sell. The tools to do all of this exist and are accessible at every stage of growth.