As your CPA, I've witnessed a concerning trend: merchants implementing questionable—and sometimes illegal—credit card practices that can impact your financial health, tax situation, and consumer rights. In our increasingly cashless society, understanding what merchants can and cannot legally ask of you regarding credit card transactions has become essential financial knowledge.
With over 80% of consumer purchases now made through electronic payment methods in 2025, and surcharges and minimum purchase requirements becoming more common, knowing your rights can save you hundreds or even thousands of dollars annually—money that could otherwise be directed toward your retirement accounts, emergency savings, or tax-advantaged investments.
I've helped dozens of clients—from small business owners confused about what they can legally charge customers to individuals who've been financially harmed by improper merchant practices—navigate these complex waters. The financial implications extend beyond simple transactions to impact your tax deductions, business expenses, and consumer protections.
One of the most common issues I see clients encounter is credit card surcharges—additional fees merchants add to transactions when customers pay with credit cards.
As of 2025, merchants in 42 states can legally add surcharges to credit card transactions to offset processing fees. However, these surcharges must adhere to strict guidelines:
Credit card surcharges remain illegal in Connecticut, Kansas, Maine, Massachusetts, New York, Oklahoma, Rhode Island, and Vermont. If you're charged a surcharge in these states, the merchant is violating state law.
For business owners, credit card surcharges paid as part of business expenses are generally tax-deductible as ordinary and necessary business expenses. However, proper documentation is essential.
For consumers, surcharges paid on tax-deductible expenses (like business travel, qualified medical expenses over 7.5% of AGI, or qualified educational expenses) are typically deductible as part of the overall expense.
CPA Insight: I find that many clients don't realize that paying with credit cards at businesses that impose surcharges can reduce the effective value of their rewards. For example, if you earn 2% cash back but pay a 3% surcharge, you're effectively losing 1% on every transaction. For clients who spend $30,000 annually on credit cards, this could mean $300 less in your pocket each year.
Many merchants establish minimum purchase requirements for credit card transactions. Here's what you need to know:
Minimum purchase requirements can impact your budgeting strategy and expense tracking. When faced with minimums, consumers often add unplanned purchases, potentially disrupting budgets and savings goals.
Client Example: A self-employed consultant I advise was regularly adding small items to reach the $10 minimum at her daily coffee shop. After tracking these expenses, she realized these unplanned purchases added up to nearly $600 annually—money that could have been directed to her SEP IRA where, at her tax bracket, it would have saved her approximately $168 in federal taxes.
Merchants often request personal information during credit card transactions that they have no legal right to demand:
With tax identity theft affecting thousands of taxpayers annually, protecting your personal information is crucial for your financial security. Each piece of information you share increases your vulnerability to fraud, including tax refund fraud.
There's an important legal and tax distinction between offering a discount for cash payments (legal in all 50 states) and imposing a surcharge for credit card use (illegal in 8 states):
CPA Insight: Many merchants incorrectly implement 'cash discounts' that are actually credit card surcharges—posting the cash price and then adding a fee for card usage. This misrepresentation can have tax implications if you're tracking business expenses, as the surcharge portion may be treated differently for tax purposes than the base price.
Many credit card agreements include forced arbitration clauses that limit your ability to seek judicial remedy for merchant abuses:
If you own a small business, you're in a unique position—both a consumer and potentially a merchant who accepts credit cards:
As a business owner, violating card network rules regarding surcharges, minimums, or information collection can result in:
For business owners, proper documentation of credit card processing fees is essential for tax deductions. In 2025, these fees remain fully deductible as ordinary and necessary business expenses.
For your personal tax situation, credit card statements serve as supporting documentation for business expenses, making it important to ensure transactions are properly recorded without improper fees.
For the growing number of self-employed individuals and gig workers, merchant credit card practices have unique implications:
Many self-employed individuals use mobile payment processors like Square, PayPal, or Stripe, which have their own rules regarding surcharges and minimums.
Credit card processing fees paid by self-employed individuals are generally deductible on Schedule C. However, personal credit card surcharges paid when making business purchases are part of the cost of those items.
Client Example: A freelance graphic designer I work with was paying nearly $2,300 annually in credit card processing fees through a traditional merchant account. By switching to a flat-rate processor better suited to her irregular income patterns, she reduced these costs to approximately $1,600 annually, increasing her net business income and reducing her self-employment tax liability.
For high-value transactions, merchant credit card practices can have significant financial implications:
For large purchases like vehicles, jewelry, or furniture, merchants often have more flexibility in absorbing credit card processing fees.
Proper receipts without improper surcharges are essential for:
When traveling internationally or making purchases from foreign merchants:
Distinguished between:
For business travelers, properly documented credit card transactions are essential for establishing foreign tax credits and business expense deductions.
As your CPA, I want you to know that understanding merchant credit card practices isn't just about avoiding a few dollars in surcharges—it's about protecting your financial rights, optimizing your tax position, and ensuring your hard-earned money is working for your financial goals rather than padding merchant profits through questionable practices.
The landscape of merchant credit card practices continues to evolve, with new regulations and court decisions regularly reshaping what is permitted. By staying informed about your rights and documenting potential violations, you not only protect your own finances but help maintain a fair marketplace for all consumers.
Remember that in situations where significant amounts are at stake or where you believe systematic abuses are occurring, consulting with both your CPA and a consumer protection attorney may be appropriate. We're here to help you navigate these complex intersections of consumer protection, tax implications, and financial planning.
This guide is intended for educational purposes only and does not constitute professional tax, legal, or financial advice. Readers should consult a qualified CPA or tax advisor regarding their individual circumstances.