The hidden costs of launching an online store in your first 90 days
Most start-up budgets list the platform, the domain and maybe some ads. The costs that hurt are the ones that are not on the list: tests that find nothing, refunds, fees from currency conversion, apps that renew, and the time before the first payout. This guide goes through them in the order they tend to appear in the first 90 days, and shows how to put a number on each before it surprises you.
Weeks one to four: setting up
Setup costs are the ones people expect, but each has a hidden part.
- Samples. Ordering them feels optional until a product arrives badly made.
- Themes and design work. A paid theme is a one-time cost, but customising it can take freelancer hours.
- Apps. Each looks cheap alone. Five of them are a real monthly bill.
- Domain and email. Small, but they renew, and the first-year price is often lower than later years.
The website cost calculator separates the first year from the renewal years, so the second-year bill does not surprise you.
Weeks three to eight: finding what sells
Testing is where cash disappears. Ads, samples and discounts are spent to learn what works, and most tests teach you what does not. Treat the test budget as spent, not invested, and choose a figure you can lose entirely.
The key number is how much each order costs to win. If that is more than the margin left after products, fees and refunds, each sale loses money. For example, a $29.90 item with a $20.00 ad cost per order and 4% refunds leaves $11.54 before ads, so each order loses $8.46 after ads. The dropshipping startup cost calculator shows this directly.
Weeks six to ten: the first refunds and disputes
Refunds, returns and card disputes arrive after your first orders. Each refunded sale means you lose the price and often the product cost too. A dispute can add a fee. Rates vary with product and shipping times, so use a cautious figure at first and replace it with your own data once you have orders.
Slow delivery causes most of these. If your supplier ships from far away, say so on the product page. Honest delivery times reduce disputes more than any policy.
Money you cannot spend yet
Payment platforms may hold payouts for the first days or weeks. Suppliers want payment before they ship. Together that means cash goes out before it comes in, so a store can be profitable on paper and short of cash in practice.
The startup runway calculator shows this. With $6,000 in cash, $1,200 of monthly costs and $100 of gross profit in month one, growth of 10% a month for a year gives a runway of 5 months. With no growth at all, the same cash lasts 5 months. The second number is the one to plan against.
Costs that arrive by post, not by invoice
- Tax. Sales tax or VAT may need collecting, and profit may be taxed. Ask an accountant how it works where you live.
- Currency conversion. A supplier that bills in another currency can add a few percent to every bill.
- Annual renewals. Domains, software and insurance renew in lumps.
- Your own time. It is not a cash cost, but if the business needs to pay for it later, plan for that.
Two habits that catch most surprises
First, keep a running list of every recurring charge, with its renewal date. Subscriptions, apps and domains are small one at a time and large together, and a list makes the large total visible. Review it monthly for anything you no longer use.
Second, compare your estimate with reality after the first thirty days. Your real refund rate, real ad cost per order and real delivery times replace the placeholders you started with. Update the calculators with them and the break-even number becomes much more reliable. If the new number is worse than the old one, that is useful news while you still have cash to change course.
A short way to plan for all of it
Add a line for each item above, put a cautious number on it, and add a buffer. Then run the e-commerce break-even calculator to see how many orders cover your fixed costs after refunds and customer acquisition. If the number looks out of reach, change the price, the supplier or the plan before spending money.
Fee figures on this site were last reviewed on 10 November 2026. Confirm on each provider’s page before you commit.
Calculators for this guide
This guide gives general estimates for planning, not financial, tax or legal advice. Platform fees change; confirm current prices on each provider’s own site. Fee data last reviewed 10 November 2026.