Cost of capital for an ecommerce brand is the yearly price of the money you use, with every fee included, measured on the balance you actually hold. A factor rate, a flat fee or a holdback is not that price. To compare funding offers, convert each one to an effective annual rate on the same purchase order, then compare that rate with the return the order earns.
It is part of our complete guide to ecommerce accounting.
This guide converts the main funding types to one basis and prices a single $40,000 purchase order four ways. For which instrument fits which purpose, see our guide to ecommerce financing options.
What is cost of capital in plain language?
The textbook cost of capital is a blended rate across a company's debt and equity, used to discount future cash flows. For an operator deciding how to pay for the next production run, the useful version is narrower: what does this specific money cost per year, all fees in?
Three parts make up that number:
- The explicit price. Interest, a flat fee, a factor rate, a discount on receivables.
- The fees around it. Origination, draw, servicing and early-repayment fees.
- The time you hold the money. The same fee over 60 days and over 240 days produces two very different annual rates.
A fourth part, opportunity cost, applies even when you use no outside money. A later section prices it.
Why the quoted number is never the cost
None of the common quoting styles is an annual rate on the money you hold.
Flat fees are stated as a percentage of the amount advanced, with no reference to time. A 6 percent fee sounds the same whether you repay in two months or eight.
Factor rates are multipliers, such as 1.12 or 1.20. You owe the advance times the factor. A factor of 1.15 means a 15 percent fee, again with no clock attached.
Holdbacks and remittance rates describe how you repay (a share of daily or weekly sales) rather than what you pay. A 15 percent holdback is not a 15 percent cost.
Average balance is the trap underneath all three. When repayment starts the day after funding, you never hold the full amount for the full term. If you repay evenly, your average balance is roughly half the principal, so the effective annual rate is roughly double the simple calculation. Our post on inventory and PO financing walks through that effect on an inventory loan; the method below generalizes it to every funding type.
How to convert a factor rate to an APR, step by step
Use this method for any product priced with a factor rate or a flat fee:
- Find the fee in dollars. Fee = advance × (factor rate − 1). A $10,000 advance at a factor of 1.15 carries a $1,500 fee.
- Estimate the repayment term in days. For a fixed schedule, read it off the agreement. For a sales-based holdback, divide the total owed by your expected daily remittance: total owed ÷ (daily sales × holdback rate).
- Work out the average balance. With even repayment that starts immediately, use about half the advance. With a single repayment at the end, use the full advance.
- Annualize. Effective APR = (fee ÷ average balance) × (365 ÷ term in days).
- Add every other fee to step 1 and repeat. Origination and servicing fees belong in the numerator.
Illustrative example: the $10,000 advance at 1.15, repaid evenly over 180 days. The simple rate is 15 percent × (365 ÷ 180) = 30.4 percent. On the average balance of about $5,000, the effective rate is ($1,500 ÷ $5,000) × (365 ÷ 180) = 60.8 percent. The quote said 1.15. The money cost about 61 percent a year.
This approximation treats repayment as even. It is close enough to rank offers, and every input comes from the agreement or your own sales history.
The true APR of each funding type
The table below shows how each funding type is quoted and what to convert. We have left out third-party rate ranges because published ranges vary widely by lender, credit profile and month, and a stale range is worse than none. Run your own offers through the method.
| Funding type | How it is usually quoted | What to convert | Average balance to use |
|---|---|---|---|
| Bank or fintech line of credit | Annual interest rate, plus draw or maintenance fees | Add fees to interest for the period you draw | The amount drawn, for the days it is drawn |
| Term loan or SBA loan | Annual interest rate, plus origination fees | Spread origination fees over the term | Declining balance; roughly half the principal on an even schedule |
| Asset-based lending | Rate on the borrowing base, plus audit and servicing fees | Add field-exam and servicing fees | The average amount outstanding |
| Inventory financing | Flat fee or monthly rate on the amount borrowed | Flat fee to annual rate on the term | Roughly half the principal if repaid in installments |
| PO financing | Fee per 30-day period on supplier cost | Fee periods that actually run, not the planned ones | The full advance until your customer pays |
| Invoice factoring | Discount on the invoice, often per period | Discount as a share of the cash advanced | The cash advanced until the invoice clears |
| Revenue-based financing | Flat fee and a share of revenue | Fee to annual rate on the expected term | Roughly half the advance |
| Merchant cash advance and platform capital | Factor rate or fixed fee, plus a holdback | Factor rate to fee, holdback to term | Roughly half the advance |
| Equity | Share of ownership | Not an APR; price it as the share of future value you give up | Not applicable |
Operators often choose revenue-based financing over a bank loan because repayment flexes down in a slow month. That flexibility is real, and it is priced into the fee, so convert it before deciding it is the better deal.
The hidden cost of platform capital
Platform capital and merchant cash advances share three features that push the effective cost above what the quote suggests.
Repayment starts before the stock arrives. The holdback applies to all of your store's sales from the day after funding. If the advance pays for a purchase order with eight weeks of production and freight, you remit for eight weeks on sales that have nothing to do with that order. Your cash balance carries the cost of the order and its repayment at the same time.
A strong month raises the rate. Because the fee is fixed and repayment follows sales, selling faster repays sooner. The dollars do not change, the days shrink, and the effective annual rate climbs. The worked example below shows the same advance at about 50 percent over 147 days and about 81 percent over 90 days.
Paying early rarely saves anything. Interest stops accruing when you repay a loan. A fixed fee is usually owed in full whether you remit for four months or six. Check the agreement for any early-payoff terms before assuming otherwise.
What is opportunity cost of capital?
Opportunity cost of capital is the return your own cash would have earned in its next best use. Paying for a purchase order from the bank account looks like it costs nothing, because no lender sends a statement. It still has a price.
If that cash would otherwise sit in a savings account, the opportunity cost is small. If it would otherwise fund the next order of a proven product, the opportunity cost is that order's profit, which can exceed the cost of a line of credit. That is why the funding decision and the working capital plan are the same conversation.
Worked example: one $40,000 purchase order financed four ways
All numbers are illustrative and chosen for clarity, not quoted from any lender. Assumptions: a $40,000 purchase order paid at week 0; store sales of $2,000 a day across all products; stock arrives in week 8 and has sold through by week 17 (120 days); repayment shapes as described in each row.
| Option (illustrative terms) | Cost in dollars | Days the money is held | Effective annual rate |
|---|---|---|---|
| Line of credit: 12% interest plus a 1% draw fee, repaid in full at day 120 | $1,578 interest + $400 fee = $1,978 | 120 | about 15% |
| Revenue-based financing: 8% flat fee, repaid evenly over 180 days | $3,200 | 180 (average balance about $20,000) | about 32% |
| Factor-rate advance: 1.10 factor, 15% holdback on daily sales | $4,000 | about 147 (average balance about $20,000) | about 50% |
| Same advance, strong month: sales lift and repayment finishes in 90 days | $4,000 | 90 | about 81% |
| Own cash | $0 paid to anyone | 120 | Opportunity cost: about $526 at a 4% idle yield, about $5,260 if it would have funded a second order earning 40% a year |
The factor-rate row repays at $300 a day (15 percent of $2,000), which is $2,100 a week against $44,000 owed, so it runs about 21 weeks. Here is how the cash leaves the business, week by week:
| Week | Line of credit: owed | Revenue-based financing: paid to date | Factor-rate advance: paid to date |
|---|---|---|---|
| 0 | $40,000 | $0 | $0 |
| 4 | $40,000 plus about $92 a week of interest | $6,646 | $8,400 |
| 8 (stock arrives) | $40,000 plus interest | $13,292 | $16,800 |
| 12 | $40,000 plus interest | $19,938 | $25,200 |
| 17 (sold through) | Repaid: $41,978 in total | $28,246 | $35,700 |
| 21 | $0 | $34,892 | $44,000, finished |
| 26 | $0 | $43,200, finished | $0 |
Two things stand out. The factor-rate advance has taken $16,800 out of the business before a single unit from the order is on the shelf. And the cheapest outside money here, the line of credit, also costs less than the own-cash option once that cash has a better use. The right answer depends on whether this order earns more than its funding costs, which is the test in our post on return on capital for ecommerce.
To price your own offers, copy the method: write down the dollar fee, the realistic number of days, and the average balance, then annualize. Use your own daily sales for the holdback row and your own cash conversion cycle for the days. For PO financing specifically, where the fee period depends on your customer's payment terms, our inventory and PO financing guide covers the detail.
How to lower your cost of capital
Lenders price risk, and most of the risk they price is visible in your books.
Clean, current, accrual-basis books. Underwriters ask for a profit and loss statement, a balance sheet, bank statements and inventory detail. Books reconciled and closed each month read as lower risk; books rebuilt the week of the application read as the opposite.
Longer channel tenure and steadier revenue. Lenders read these first, and they improve on their own when the history is recorded accurately.
Lower existing debt. Stacked advances raise the price of each new one, and two holdbacks on the same sales compound the cash strain. Pay down the most expensive balance first.
A shorter cash cycle. The fewer days money sits in stock, the fewer days you pay for it. Faster sell-through, better supplier terms and quicker payouts all reduce the cost of capital without a new offer. Our inventory turnover benchmarks show where your category sits.
Accurate margin per SKU. Per-SKU margin with true landed cost included decides whether an order can carry any funding cost at all.
Where Futureproof fits
Futureproof never lends and never moves money. What it does is keep the inputs to this calculation current. Six AI agents work one ledger: payouts reconciled, landed cost allocated per unit, margin by channel and by SKU. Margo prices a production run against your projected balance on each payment date and says how many units that cash covers, so you can see what you can afford next before you choose how to fund it. Amazon and eBay are live, and Shopify is in beta.
Your books already hold the inputs: revenue, margin and timing. Start a 14-day trial or book a demo. Plans start at $1,000/month for all six agents.
FAQ
How do I convert a factor rate to an APR?
Multiply the advance by the factor rate minus one to get the fee in dollars. Estimate the repayment term in days. Divide the fee by your average balance (about half the advance if repayment starts immediately and runs evenly), then multiply by 365 divided by the term. A 1.15 factor repaid evenly over 180 days works out to roughly 61 percent a year.
Why does Shopify Capital not show an interest rate?
As of October 2026, Shopify's help center page for its merchant cash advance (the Canadian version) describes it as a lump sum provided for a fixed fee, repaid as a percentage of daily sales (the remittance rate), with no interest rate because Shopify purchases a set amount of future receivables at a discount (Shopify Help Center). Because the fee is fixed and the term depends on your sales, you have to estimate the term and convert the fee yourself to compare it with a loan.
Is cost of capital the same as the interest rate on my loan?
No. The interest rate is one input. Cost of capital includes every fee, reflects how long you hold the money and on what average balance, and for your own cash includes the opportunity cost of not using it elsewhere. Two loans with the same stated rate can have different costs once fees and repayment shape are counted.
What is a reasonable cost of capital for an ecommerce brand?
There is no single reasonable number. The useful test is relative: the cost of capital is reasonable when it is lower than the return the funded order earns over the same period. A 40 percent effective rate can be a good trade on a fast-selling, high-margin SKU and a poor one on a slow, thin-margin SKU. Calculate both numbers on the same order before signing.
