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Business Model Viability with Payment Costs

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TL;DR
  • Add processing fees, chargebacks, fraud tools and working capital to your own model. A headline processing rate doesn't cover them all
  • A business model with 20% gross margin and 5% payment costs leaves 15% for everything else - validate this math before launch, not after your first month of revenue
  • High-risk categories (digital goods, supplements, travel) face higher processor rates, mandatory reserves, and limited processor options - model these costs explicitly
  • Chargeback costs compound. Model your own dispute count, reversed revenue, fees, lost product and staff time without counting the same loss twice
  • Check whether chargebacks are actually your problem before you spend money fixing them. Example 2 below loses money at a zero chargeback rate. Run the model at 0% disputes first; if it's still negative, the fix is price, COGS or CAC, not fraud tooling
  • Which processor you pick moves the number more than most operators expect. The same $50 order costs $1.74 on Braintree and $2.24 on PayPal Checkout, both published rates

Your business model might not survive payment costs. Worked example: a product with 25% gross margin and assumed payment costs of 4% of revenue leaves 21% to cover marketing, ops and profit. Assume another 1% of revenue in chargeback costs and that's 20%. This page helps you validate viability BEFORE launch.

The Question This Answers​

"Can I actually make money after payment costs?"

Worked example, assumed non-processing costs:

  • Product cost: $30
  • Sell for: $50
  • Margin: 40% = $20 profit
  • Conclusion: Viable!

But they forget:

  • Payment fees: $1.74 (3.47% effective, at Braintree's published 2.89% + $0.29 on a $50 order)
  • Chargebacks: $0.50/order average (0.5% ratio × $100 true cost)
  • Fraud decline recovery: $0.25/order
  • Real profit: $17.51 (35.0% net margin)

Add marketing/CAC ($15/customer) and net profit is $2.51 (5.0%).

A spike in chargebacks cuts this example's already thin margin. Recalculate the costs before calling the order profitable.

Where the processing rates here come from

Every worked example below uses Braintree's published US card rate of 2.89% + $0.29 (source, verified 2026-08-02), because it's the flat online rate this site could verify in USD. Substitute your own processor's published rate. It matters: the same $50 order costs $1.74 on Braintree, $1.75 on Square's Plus plan at 2.9% + 30c, and $2.24 on PayPal Checkout at 3.49% + $0.49.

Unit Economics Calculator​

Step 1: Base Economics​

Your NumbersCalculation
Selling price: $______A
Product cost: $______B (COGS)
Gross margin: $______C = A - B
Gross margin %: ___%C / A

Step 2: Payment Costs Per Transaction​

CostCalculationAmount
Processing feeA × rate + fixed$____
Chargeback costCB ratio × incremental loss per dispute, net of recoveries$____
Fraud false positiveLost legitimate orders × contribution per order / paid orders in the same cohort$____
Total payment costSum above$____

Step 3: Net Margin After Payments​

MetricCalculation
Net margin after paymentsC - payment costs
Net margin %Above / A

Step 4: Viability Check​

Your net margin after payment costs has to cover:

  • Marketing (CAC)
  • Operating expenses
  • Profit

Check those costs in your own model. Stress the dispute and processing inputs before deciding how much buffer you need.

Worked Examples​

The non-processing costs below are assumed inputs, not benchmarks. For chargebacks, use the extra reduction in profit after recoveries. Include reversed revenue and fees, but don't add product or shipping already charged in COGS again. A net cost below the disputed sale needs a recovery assumption; otherwise rerun with the full reversal.

Example 1: $50 Product, 40% Margin, 0.5% CB Ratio (VIABLE)​

MetricAmount
Selling price$50.00
Product cost$30.00
Gross margin$20.00 (40%)
Processing (3.47%)-$1.74
Chargeback (0.5% × $85)-$0.43
Net after payments$17.83 (35.7%)
Marketing (CAC)-$10.00
Net profit$7.83 (15.7%)

Verdict: Viable. Roughly 16% net profit provides a buffer.

Maximum sustainable CB ratio on margin alone: ($20.00 - $1.74 - $10.00) / $85 = 9.7%. Margin is not what constrains this business. Check your processor's written limit and the published program criteria, including counts. The maths alone doesn't protect the account.

Example 2: $30 Product, 30% Margin, 1.5% CB Ratio (NOT VIABLE AT ANY CHARGEBACK RATE)​

MetricAmount
Selling price$30.00
Product cost$21.00
Gross margin$9.00 (30%)
Processing (3.86%)-$1.16
Chargeback (1.5% × $75)-$1.13
Net after payments$6.71 (22.4%)
Marketing (CAC)-$8.00
Net profit-$1.29 (LOSS)

Verdict: Not viable, and chargebacks aren't the reason.

The instinctive fix is to cut the chargeback ratio. It doesn't work. Redo the maths with zero chargebacks: $9.00 margin, minus $1.16 processing, minus $8.00 CAC = -$0.16. The business loses money on a perfect order with no disputes at all. There is no chargeback ratio that rescues it.

Maximum sustainable CB ratio: none. The levers here are price, COGS and CAC, in that order. Raising the price to $33 with the same $21 cost and $8 CAC gets you to $2.76 before chargebacks ($12.00 margin, less $1.24 processing, less $8.00 CAC), which then supports a CB ratio up to about 3.7% on margin, though the monitoring thresholds cap you far below that.

Example 3: $100 SaaS Subscription, 80% Margin, 0.3% CB Ratio (HIGHLY VIABLE)​

MetricAmount
Selling price$100.00
Product cost$20.00 (hosting)
Gross margin$80.00 (80%)
Processing (3.18%)-$3.18
Chargeback (0.3% × $25)-$0.08
Net after payments$76.74 (76.7%)
Marketing (CAC amortized)-$5.00
Net profit$71.74 (71.7%)

Verdict: Profitable on these assumed net-loss inputs. Verify what the $25 dispute cost includes before calling the model viable; a full $100 reversal would exceed that input before fees.

Maximum sustainable CB ratio on these inputs: ($80.00 - $3.18 - $5.00) / $25 = 287%. That result is outside the feasible range of a same-cohort dispute rate. It doesn't verify the loss assumption or protect the account. Check your processor's limit and the published program criteria separately.

One thing SaaS operators miss: stored-card rates can be higher than one-off online rates. Square bills card on file at 3.5% + 15c, the same as keyed entry, against 2.9% + 30c for a normal online sale (source, verified 2026-08-02). On a $100 subscription that's $3.65 instead of $3.20. Check what your processor charges for recurring specifically.

Example 4: $20 Digital Product, 90% Margin, 2% CB Ratio (NOT VIABLE)​

MetricAmount
Selling price$20.00
Product cost$2.00
Gross margin$18.00 (90%)
Processing (4.34%)-$0.87
Chargeback (2% × $25)-$0.50
Fraud tool-$0.28 (example tool cost)
Net after payments$16.35 (81.8%)
Marketing (CAC)-$12.00
Net profit$4.35 (21.8%)

The fraud tool line is 28 cents an order, assuming one check per order and full use of SEON's $699/month allowance of 2,500 checks, verified 22 October 2026. $699 / 2,500 = $0.2796. At a $20 order that's 1.4% of revenue. Fewer orders make the subscription cost more per order.

Verdict: Profitable on paper, not viable as an account. A 2% CB ratio is above both networks' 1.5% ratio lines and the 1.5% MATCH code 04 floor. Program enrollment also needs counts. Published processor lines use different metrics: Stripe describes dispute activity above 0.75% as excessive, Shopify can enroll at 1.5% over 90 days on its NDRP inclusive rate, and PayPal charges a high volume fee at its own 1.5% dispute ratio. See the published lines.

Maximum sustainable CB ratio: on margin alone, ($18.00 - $0.87 - $0.28 - $12.00) / $25 = 19.4%. That isn't a safe account limit. Your processor's terms and the applicable program criteria still apply.

Chargeback Ratio Tolerance by Margin​

A margin percentage alone can't set a chargeback ceiling. Use the worked examples above with your price, COGS, processing fee, CAC and all-in cost per dispute.

BUT: Margin doesn't protect an account from fees or termination.

Practical max: Model the margin-based break-even, then check your processor's limit and the applicable program criteria separately. Use Thresholds.

Viability Decision Tree​

Industry-Specific Viability Checks​

Physical Goods E-Commerce​

Check your own requirements:

  • Gross margin after COGS must cover payments, CAC and fixed costs
  • Expected CB costs: Fit your margin and stay within your processor's limit
  • AOV: Calculate the fixed fee as a share of your actual ticket

Red flags:

  • Margin won't cover costs and your modeled stress buffer
  • Commodity products (price competition kills margins)
  • Long shipping times (more disputes)

Verdict examples:

  • Luxury goods: Check product cost, CAC and disputes
  • Apparel: Include returns and dispute costs
  • Low-cost accessories: Check the fixed fee on small orders

Subscription SaaS​

Check your own requirements:

  • Gross margin must cover payments, acquisition and fixed costs
  • LTV/CAC: Use matched cohorts and actual retention, not a universal minimum
  • Churn: Compare customer and revenue churn on matched cohorts with your own retention and cost model

Red flags:

  • Margin won't cover acquisition and operating costs
  • High involuntary churn (payment failures)

Verdict: Run the subscription model with your actual retention and acquisition costs.

Digital Goods / Downloads​

Check your own requirements:

  • Gross margin must cover payments, acquisition and fixed costs
  • CB costs: Model your own dispute rate; check your processor's limit
  • AOV: Check the fixed fee on your own order values

Red flags:

  • Rising disputes: investigate fraud, delivery and quality issues
  • Low AOV: Calculate the fixed-fee share
  • No delivery proof: Check what evidence your processor accepts

Verdict examples:

  • Software downloads: Include support and acquisition costs
  • Courses/education: Include refunds and delivery evidence
  • Low-price PDFs: Check the fixed fee and CAC per order

Card-Present Retail​

Check your own requirements:

  • Gross margin must cover payments, staffing and fixed costs
  • CB costs: Model card-present disputes separately; check your processor's limit
  • Foot traffic reliability

Red flags:

  • Margin won't cover costs on your actual sales mix
  • High-ticket items with long warranty periods

Verdict: Model card-present fees and losses on your own mix before deciding.

When Payment Costs Kill Your Business Model​

Unviable scenarios:

1. Commodity E-Commerce (Thin Margins + Price Competition)​

Model:

  • Product: $25
  • Margin: 20% = $5
  • Payment cost: 4.05% = $1.01 (Braintree at 2.89% + $0.29 on a $25 order)
  • Net: $3.99 (16.0%)
  • CAC: $8
  • Result: $4.01 loss per customer

Why it fails: Commodity pricing leaves no room for payment costs.

Fix: Test a higher price, lower product cost or lower CAC. More orders at the same loss won't help.

2. High-CB Rate Business (Supplements, CBD-Adjacent)​

Model:

  • Product: $60
  • Margin: 50% = $30
  • Payment cost: 3.37% = $2.02 (Braintree at 2.89% + $0.29 on a $60 order)
  • CB ratio: 2.5%
  • CB cost: 2.5% × $90 = $2.25
  • Net: $25.73 (42.9%)

Math works, but:

  • A 2.5% model input doesn't tell you whether you're in a program; check the ratio and count criteria
  • Your processor can impose its own limit
  • The model must survive those terms too

Fix: Reduce disputes within your processor's limit. If you're considering a high-risk processor, get its limits and terms in writing first.

3. Low-AOV Digital Goods (Fixed Fee Problem)​

Model:

  • Product: $10 digital download
  • Margin: 95% = $9.50
  • Payment cost: 5.79% = $0.58 (Braintree at 2.89% + $0.29). On PayPal Checkout at 3.49% + $0.49 it's $0.84, or 8.4%
  • Net: $8.92 (89.2%)

Math works, but:

  • CAC: Use your own acquisition cost
  • Limited profitability
  • Volume needed is huge

Fix: Bundle products (3 for $25) to reduce fixed fee impact.

Viability Quick Test​

Answer these 5 questions:

  1. Gross margin after COGS: ____%

    • Subtract payment costs and CAC
    • Check whether what's left covers fixed costs
    • Stress the inputs before choosing your buffer

  2. Expected chargeback ratio: ____%

    • Model the cost at your expected ratio and at a worse one
    • Compare both with your processor's limit
    • Check the published program criteria, including counts
    • If you can't stay within the written terms, fix the dispute causes before scaling

  3. Average order value: $______

    • Divide the fixed fee by this amount
    • Add the percentage fee
    • Compare the total with contribution per order

  4. Product cost if chargebacked: $______

    • Digital: Low cost (just fee)
    • Physical: Product + shipping lost
    • High cost = need very low CB ratio

  5. CAC (customer acquisition cost): $______

    • Subtract CAC after payment costs
    • Compare remaining contribution with fixed costs
    • Stress acquisition costs before calling the margin healthy

If you answered:

  • Contribution covers fixed costs and your stress buffer: Check account limits before scaling
  • Question 2 exceeds limits or Question 4 is expensive: At risk
  • CAC exceeds contribution after payments: Rework the model

Test to Run​

Pre-launch viability audit:

Week 1: Calculate unit economics

  1. Product price: $______
  2. COGS: $______
  3. Gross margin: $______ (___%)

Week 2: Add payment costs 4. Processing fee: $______ 5. Expected CB ratio: % 6. CB cost/transaction: $__ (ratio × true CB cost) 7. Net margin after payments: $______ (___%)

Week 3: Add acquisition costs 8. CAC estimate: $______ 9. Contribution margin: $______ (net margin - CAC) 10. If negative: Business not viable 11. If the margin won't cover fixed costs and a stress-case buffer: Optimize before launch 12. If it covers those costs: Check the stressed model before proceeding

Success criteria: Your calculated contribution covers fixed costs and a buffer based on the stress tests below. Recheck with actual sales and costs after launch.

Then stress the margin. Simulate the worst case:

Scenario 1: CB ratio doubles

  • Current CB ratio: ____%
  • Double it: ____%
  • Recalculate contribution margin: $______
  • Still profitable? Y/N

Scenario 2: Processor raises rates 0.5%

  • Current rate: ____%
  • New rate: ____%
  • Recalculate contribution margin: $______
  • Still viable? Y/N

Scenario 3: Enter monitoring program

  • Monthly assessment: $______ from your acquirer's applicable program terms, or a labelled stress assumption
  • Divide by monthly orders: $______ per order
  • Add to costs, recalculate margin: $______
  • Can you survive? Y/N

Success criteria: Your business stays profitable in all three scenarios. If it doesn't, you have no safety margin.

Scale Callout​

Pre-launch:

  • Run this calculation BEFORE processing first payment
  • Model a worse dispute rate as an explicit assumption
  • Set a buffer from stressed fixed-cost and cash needs

Under $100K/month:

  • Re-run calculation every quarter
  • Actual CB ratio may differ from projection
  • Adjust if contribution won't cover fixed costs and your modeled buffer

$100K-$500K/month:

  • Model the impact of breaching your processor's limit; check Thresholds
  • Calculate if business survives monitoring program fines
  • Calculate the margin needed to absorb the payment spikes you modeled

Over $500K/month:

  • Quarterly model updates
  • Stress test: What if CB doubles?
  • What if processor raises rates?

When to Pivot or Quit​

Red flags your business model isn't viable:

1. Negative Contribution Margin​

If CAC + payment costs > gross margin:

  • You lose money on every sale
  • More sales = more losses
  • This is not fixable with scale

Action: Raise prices, reduce CAC, or quit

2. Can't Stay Within Your Processor's Written Limit​

If your dispute rate keeps breaching the limit, check:

  • Supplements: marketing claims and renewal terms
  • High-ticket with long delivery: promises and delivery updates
  • Digital goods: evidence collection and access records

Action: Fix the causes and agree a remediation deadline with your processor. Get help if you can't meet it.

3. Margin Compression Makes Payments Unaffordable​

If margin drops from 40% → 25% due to competition:

  • Recalculate payment costs at the new price, ticket size and sales mix
  • Room for profit evaporates
  • Race to bottom

Action: Differentiate or exit market

4. Fixed Fee Problem on Low AOV​

If selling $15 products:

  • Processing: $0.72 (4.82% effective, Braintree at 2.89% + $0.29)
  • On PayPal Checkout at 3.49% + $0.49 the same order costs $1.01, or 6.7%
  • Almost 5% to payments alone, and nearly 7% through the wrong button
  • Break-even margin depends on CAC and the other costs you still need to cover

Action: Increase AOV (bundles, upsells) or raise prices. The 29c to 49c fixed fee is the part you can't out-scale, so bundling three $15 items into one $45 order takes the fixed-fee drag from 1.93% to 0.64% on Braintree.

Viability by Business Model​

High Viability​

Business TypeWhy Viable
SaaS (high ARPU)Test recurring contribution against retention and CAC
Luxury goodsTest product margin, fraud and acquisition costs
B2B servicesTest contribution and collection timing on your invoice mix
Digital products (courses)Test delivery costs, refunds and acquisition costs

Characteristics: High margin, low CB ratio, or both

Marginal Viability (Requires Perfect Execution)​

Business TypeWhy Marginal
ApparelModel your own product margin, returns and dispute costs
Consumer electronicsModel product margin and fraud losses
Subscription boxesModel product margin, churn and acquisition costs
Print-on-demandModel product margin, shipping and disputes

Characteristics: Moderate margin with moderate CB risk

Requirement: Keep dispute costs within your margin and your processor's limit; optimize processing costs

Low Viability (High Risk of Failure)​

Business TypeWhy Risky
DropshippingModel product margin, delivery delays, disputes and fraud
SupplementsCheck product margin, marketing claims, disputes and processor terms
CBD productsGood margins BUT processors reject, MATCH risk
High-ticket furnitureModel delivery delays and dispute costs against your processor's limit

Characteristics: Either thin margins OR unsustainably high CB ratio

Reality: These businesses struggle with payments regardless of demand

Alternative Payment Methods for Low Margins​

If your margin can't sustain 3-4% card processing:

AlternativePublished costProsCons
ACH debit acceptanceHelcim 0.5% + 25c, capped $6, plus 0.05% on the amount over $25,000. Braintree standard ACH Direct Debit 0.75%, capped $5 ($5 for a return or an unauthorized-payment dispute). Square invoice ACH 1%, $1 min; Plus and Premium cap the fee at $10, Free has no cap. PayPal invoice Pay by Bank (ACH) 1%, capped $10Caps vary by provider and product; include any invoice feesDelayed confirmation, returns, friction
Cash (card-present)$0FreeOnly works for local retail
SEPA Direct Debit (EU)Adyen $0.13 + EUR 0.27 per transactionFlat fee, no percentageEU only, 8-week dispute window
Invoice / NET 30$0No processing feesB2B only, collection risk

ACH prices verified against each provider's own pricing page on 21 October 2026. Other figures last verified on 2026-08-02.

ACH can save money on large B2B payments. At Braintree's published standard rates, a $500 payment costs $3.75 by ACH Direct Debit or $14.74 by card. Add any invoice or software fees before comparing totals.

If cards don't fit your margin: compare the full cost and collection risk of the alternatives.

Where This Breaks​

  1. LTV assumptions for subscriptions: Under a constant 30% monthly churn assumption, expected lifetime is 1 / 0.30 = about 3.3 months, not 12. Rebuild cohort LTV before setting CAC.

  2. CB ratio projections: Don't treat a guessed low ratio as a baseline. Model a worse scenario, then update it with your actual disputes and reporting lag.

  3. Marketing cost creep: Stress a higher CAC as an assumption. Initial viability doesn't guarantee long-term viability.

  4. Returns not modeled: Returns and chargebacks need the same period and denominator before you add their rates. Remove overlaps and model recoveries. A refunded order isn't automatically a full loss, and a count-based rate isn't a share of revenue.

  5. Reserve lock-up not in P&L: At an assumed 8% annual cost of capital, $50K locked × 8% = $4K/year in opportunity cost. Keep that separate from interest expense already booked.

Next Steps​

Planning a new business?

  1. Calculate unit economics using this worksheet
  2. Model worse payment costs as an explicit stress assumption
  3. Check that contribution covers fixed costs and the stress-case buffer you modeled
  4. Review Total Cost Model for detailed budgeting

Existing business, margins compressing?

  1. Recalculate contribution margin with current costs
  2. Compare contribution with fixed costs and your modeled stress-case buffer
  3. Optimize: Reduce chargebacks OR raise prices OR reduce CAC

Evaluating new market/product?

  1. Run viability model for new segment
  2. Compare to current business
  3. Don't launch if new segment has worse economics

See Also​

Something wrong on this page? Email matt at paymentsandrisk.com and say what needs fixing.