Estimated reading time: 4 minutes
Table of contents
If you run an e-commerce business, you already know how much taxes influence your bottom line. A 2024 Omnisend study ranked taxes as the number one factor affecting where e-commerce owners choose to operate, and that finding reflects a reality you cannot ignore. Taxes can strengthen your profitability or quietly erode it.
The key is understanding what you can legally deduct, how the rules are changing, and what documentation the IRS now expects. The landscape for e-commerce owners continues to shift, especially with the introduction of the 2025 One Big Beautiful Bill Act (OBBBA) and recent Tax Court decisions that tighten standards around “ordinary and necessary” business expenses.
This is the time to get very intentional about your financial systems, your documentation, and the professionals supporting you.
New Deduction Rules You’ll Be Working With
1. Research and Experimentation (R&E) Expenses
Domestic R&E costs can again be fully deducted in the year they occur. This reverses the five-year amortization requirement that came out of the TCJA.
For foreign R&E expenses, the 15-year amortization period is still in place.
There is also transitional relief for smaller businesses with average gross receipts under $31 million, allowing these owners to retroactively apply the updated rules to tax years starting after December 31, 2021. If you do any kind of product development, testing, or research, this change could create significant opportunities.
2. Business Interest Deductions
The OBBBA permanently expands the way adjusted taxable income is calculated under IRC Section 163(j). Depreciation, amortization, and depletion will once again be included when determining the interest limitation.
The result is a more generous business interest deduction, one that applies retroactively to the beginning of 2025.
The IRS Is Tightening Expectations Around Documentation
Recent court rulings reinforce what many advisors have been saying for years: substantiation is everything.
1. Credit card and bank statements are not enough
A February 2025 Tax Court decision disallowed deductions for a self-employed taxpayer who failed to provide documentary evidence supporting her expenses. The court was clear. Generic statements do not show the business purpose behind a transaction.
2. Expenses must be both ordinary and necessary
An expense must be appropriate, helpful, and reasonable in amount. Even expenses that are genuinely needed may be denied if the cost is considered excessive for the type of business.
For e-commerce owners, where transactions run high and expenses are varied, this level of scrutiny makes proper bookkeeping and clear documentation non-negotiable.
Why Professional Support Matters More Than Ever
Tax rules are becoming more nuanced, and compliance standards are rising. A knowledgeable CPA, especially one familiar with e-commerce, can help you:
- Identify every deduction you qualify for
- Keep you aligned with new tax law changes
- Ensure your documentation would hold up under IRS review
- Protect your profitability by preventing missed deductions
Equally valuable is a bookkeeping partner who provides strong systems, organized records, and a reliable client portal. When your financial data is current and accessible, you make better decisions, and you stay audit-ready.
Common E-commerce Deductions You Should Review
Here is a practical list of deductions many e-commerce owners qualify for. Review these and confirm which ones apply to your business:
Marketplace and Operations
- Amazon Seller Central subscription fees
- FBA pick, pack, and shipping charges
- Referral commissions
- Advertising costs, including Amazon PPC and external ads
- Inventory storage and long-term storage fees
- Removal or disposal fees
- Refund administration fees
Tools and Software
- Product research tools
- Inventory management and accounting software
- Re-pricers
- Productivity tools and task management systems
Content and Marketing
- Product photography and videography
- Graphic design, branding, and listing optimization services
Labor and Professional Support
- Freelancers and virtual assistants
- Prep centers and 3PL services
- Shipping to FBA warehouses or direct-to-consumer
- CPAs, attorneys, and tax strategists
Office and Equipment
- Supplies such as labels, tape, and packaging
- Laptops, printers, cameras, and monitors (portion allocated to business use)
- Home office deduction
- Internet and phone, based on business usage
Education and Travel
- Courses, books, and webinars
- Trade shows, supplier visits, mileage, lodging, and travel meals
Financial Services
- Bank service charges
- Payment processing fees
- Wire fees
Final Thoughts
The rules around ecommerce deductions are evolving, and the IRS is placing more emphasis on detailed, accurate records. The more proactive you are now, the more you protect your business later. Strong bookkeeping, informed tax guidance, and consistent documentation will put you in the best position to reduce your tax burden and strengthen your profitability.
If you want support reviewing your current systems or building a more reliable framework for documenting expenses, begin preparing now. The 2025 tax year brings opportunities, and getting ahead of them is the best way to take advantage of every dollar available to you.
