The Legal Foundation: IRS Code Section 162(a) 

The authority for deducting business expenses comes from Internal Revenue Code Section 162(a). 

You can review it here: 
https://www.law.cornell.edu/uscode/text/26/162 

Section 162(a) allows a deduction for: 

“All the ordinary and necessary expenses paid or incurred during the taxable year in carrying on any trade or business.” 

That’s the key phrase: ordinary and necessary. 

Ask yourself: 

Is accepting credit cards ordinary in modern commerce? 
Yes. 

Is paying merchant processing fees necessary to accept those payments? 
Yes. 

That is why merchant processing fees qualify as deductible business expenses under federal tax law. 

Understanding the 1099-K and Gross Reporting 

Many business owners get confused because their payment processor issues Form 1099-K, which reports the gross amount of payment transactions processed for the year. 

The IRS explains how to handle this in its official guidance: 

IRS: What To Do With Form 1099-K 
https://www.irs.gov/businesses/what-to-do-with-form-1099-k 

The key point: 

The 1099-K reports gross receipts — before fees. 

Your processor deducts fees before deposits hit your bank account, but the IRS still expects you to report the gross amount of income. 

That means: 

• You report gross receipts. 

• You separately deduct your processing fees as a business expense. 

If you processed $500,000 in card payments and paid $15,000 in fees: 

• Your 1099-K shows $500,000. 

• You deduct $15,000 as a business expense. 

• You are taxed only on your net profit after expenses. 

Failing to deduct those fees means overpaying taxes. 

What Exactly Counts as a Deductible Processing Fee? 

Generally deductible merchant-related expenses include: 

• Credit card processing fees. 

• Debit card processing fees. 

• Interchange fees 

• Card network assessments (Visa, Mastercard, etc.) 

• Gateway fees 

• Monthly merchant account fees 

• PCI compliance fees 

• Payment platform service fees 

• Chargeback fees 

• ACH processing fees. 

If it’s part of the cost of accepting electronic payments, it is typically an ordinary and necessary business expense. 

Does This Apply to All Business Structures? 

Yes. 

This is critical to understand. 

Sole Proprietors (Schedule C Filers) 

If you file Schedule C with your Form 1040, processing fees are deducted as an ordinary business expense. They are often categorized as: 

• “Bank charges” 

• “Merchant fees” 

• “Payment processing fees” 

Single-Member LLCs 

If taxed as a sole proprietor, same treatment as Schedule C. 

If elected as an S-Corp, fees are deducted at the corporate level. 

Partnerships and Multi-Member LLCs 

Processing fees are deducted at the partnership level before profit is distributed to partners. 

S-Corporations 

Merchant fees reduce corporate income before pass-through to shareholders. 

C-Corporations 

Processing fees reduce taxable corporate income directly. 

No matter the structure, the principle is the same: 

If the business incurred the expense, the business deducts the expense. 

What About Cash Discounting, Dual Pricing, and Surcharging? 

This is where many business owners hesitate. 

If you use: 

• Cash discount programs. 

• Dual pricing models 

• Credit card surcharges. 

Are the processing fees still deductible? 

Yes. 

Even if your pricing structure passes on some cost to the customer, the processing fee is still an expense incurred in the operation of your business. 

The IRS does not disallow deductions based on pricing strategy. 

What matters is: 

Was the fee paid as part of conducting business? 

If yes, it is generally deductible. 

Why This Is Financially Important 

Let’s run simple numbers. 

If your business processes: 

$1,000,000 in card volume 
At an average effective rate of 3% 

That’s $30,000 in annual processing fees. 

If your combined federal and state tax rate is 30%, failing to deduct that expense could cost you: 

$9,000 in unnecessary taxes. 

That’s real money. 

Multiply that over 5–10 years and it becomes significant. 

Common Mistake: Reporting Only Net Deposits 

Some business owners mistakenly record only net bank deposits as revenue. 

That creates accounting issues because: 

• 1099-K reports gross revenue. 

• Your books show net revenue. 

• This creates discrepancies. 

The correct method is: 

1. Record gross revenue. 

1. Record processing fees separately as an expense. 

This keeps your books clean and audit-ready. 

Proper Recordkeeping Best Practices 

To support your deduction: 

• Keep monthly merchant statements. 

• Retain your Form 1099-K. 

• Reconcile monthly totals in your accounting software. 

• Maintain separate expense categories for clarity. 

Clean records protect you in the event of an audit and ensure your CPA can maximize deductions accurately.