Last updated:
Quick answer
Tell the AI your average sale size and monthly volume. It does the fee math for cards, ACH, and checks so you can decide what to accept based on numbers, not vibes.
At a glance
All outcome figures are estimates from cited sources, not independent verification by us.
- What it is allowed to do
- Read-only
Only reads, researches, or summarizes. It never drafts outbound content or changes anything.
- Time saved (estimate)
- Saves an estimated 1 to 2 hours of research and spreadsheet math.
- Difficulty
- Intermediate
- Tools needed
- ChatGPT
- Typical cost
- Free tiers of ChatGPT or Claude handle this. No paid plan needed.
Reviewed Oct 19, 2026
Basis (estimate): Your own estimate: comparing processor pricing pages and fee structures by hand vs one AI session with your numbers. Not measured.
What does this setup do?
Compare payment method costs: card processing fees vs ACH vs checks vs cash
Who is it for?
A small business owner wondering if credit card fees are eating their margin
How do you set it up?
Tools
- ChatGPT or Claude (free tier works)
- Your average transaction size and monthly card volume, roughly
Steps
- Write down your average sale size and roughly how much you take in cards per month.
- Note how you get paid today: cards, checks, bank transfer, cash.
- Paste the prompt below with your numbers.
- The AI compares the real cost of each method at your volume, including the flat per-transaction fees.
- Look at the speed tradeoff too: cards cost 2 to 3 percent but get you paid days or weeks sooner.
- Decide your mix: many businesses take cards for speed and push big invoices to ACH.
- If you pass fees to customers, check your state's surcharge rules first. Some states restrict them.
Example output
Illustrative. Your results will differ.
- Your input turned into a clear, prioritized plan
- Next 3 actions with dates, in priority order
- You stay in charge. The agent just organizes.
Where to paste this prompt
ChatGPT: ChatGPT → Project instructions, or ChatGPT Tasks for scheduled reminders (once a day on Free)
Copy-paste prompt
Adapt bracketed fields to your situation.
Help me decide which payment methods to accept. My average transaction is $[AMOUNT]. I process roughly $[VOLUME] per month. Currently I accept [cards / checks / bank transfer / cash]. Compare the true cost of: 1) credit cards at typical small-business rates, 2) ACH bank transfer, 3) paper checks including my time to deposit them, 4) cash including handling. Show the math for my volume. Then recommend a payment mix and tell me when it makes sense to steer a client toward ACH instead of card. Note any state surcharge rules I should check.Newsletter
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What usually goes wrong?
Where agents tend to stall on this job. More patterns in Where AI gets stuck.
- Comparing only the headline percentage and ignoring the per-transaction flat fee.
- Forgetting that checks cost your time: trips to the bank, waiting for clearance, chasing bounced ones.
- Surcharging debit cards. You cannot surcharge debit under card network rules.
- Assuming your state allows surcharging. A few states restrict it. Check before you implement.
Which chat tools work with this prompt?
Paste the prompt into any of these assistants (free or paid tiers).
- ChatGPT
- Claude
Common questions
- How much do credit card processors actually charge?
- Typical small-business flat rates run about 2.6 to 3.5 percent plus 15 to 49 cents per transaction, depending on the provider and whether the sale is in person or online.
- Is it legal to add a surcharge for credit cards?
- In most states yes, with caps and disclosure rules, but a few states restrict it. Debit cards can never be surcharged. Check your state's current rules before doing it.
- Should I just go cash only?
- Cards carry about two-thirds of US consumer payments now. Going cash-only saves the fee but costs you the customers who reach for a card by reflex.
What tips make it smoother?
- ACH is the quiet winner for big invoices: often under $1.50 flat vs 3 percent on a card.
- Cards get you paid faster. A 3 percent fee can be worth it if it turns a 45-day wait into 2 days.
- Watch the flat per-transaction fee. On small tickets it hurts more than the percentage does.
- If you surcharge cards, disclose it clearly and check your state. A surprise fee at checkout loses customers.
Where do the claims come from?
Summaries use public sources linked below, not independent verification. How setups are picked.
- Read Relay’s write-up (relayfi.com)
Relay: Cards vs ACH vs checks: fee math at real invoice sizes, and when speed beats the fee.
- Read UENI’s write-up (ueni.com)
UENI: 2026 card processing rates: Square, Stripe, PayPal compared, and why flat fees hit small tickets hardest.
Related setups
- Extract vendor invoices and bundle the month for accounting
When invoice email arrives, extract vendor, amount, due date, and invoice number into a tracker; at month-end, bundle PDFs plus an index for your accountant after you approve.
- Draft a client invoice in ChatGPT from your notes
Turn rough project notes into a formatted invoice with line items, subtotal, tax note, and payment instructions.
- Log receipts by photo instead of typing
Photograph receipts and have AI pull out vendor, date, and total into a running expense sheet.