A product costs ten dollars, so selling it for twenty must leave ten dollars profit. That calculation is tempting, especially when you are exploring Amazon between work, school pickups, and dinner. It is also incomplete. My advice from a seller’s perspective is simple: understand exactly where your money goes before deciding how much inventory to buy. A useful budget protects your choices, your household, and your ability to learn without rushing.
Start with money you can actually set aside
Before researching suppliers, separate your household budget from your business experiment. Rent, groceries, childcare, and emergency savings already have jobs. Do not quietly assign the same dollars to inventory. Decide what you could allocate without depending on immediate sales, then write down that boundary. If the amount is small, your first milestone can be learning and comparing options. Opening an account or placing an order does not need to happen today.
Use a separate spreadsheet tab for your starting assumptions. Record what you know, what needs a quote, and what remains uncertain. For earlier decisions about goals and responsibilities, read our guide to planning before opening an Amazon account.
Build a cost map beyond the product price
Think in four buckets: getting ready, buying stock, completing orders, and keeping the business running. Your buying bucket might include samples, inventory, packaging, shipping to your chosen destination, and applicable import costs. These are questions to investigate for your situation, not charges that apply identically to every seller. Ask suppliers what their quotation includes and excludes. A cheaper unit price can look different once transport and preparation enter the calculation.
Amazon’s Canadian pricing information separates selling plan charges and referral fees. Fulfilment choices introduce further costs. With Fulfilment by Amazon, investigate fulfilment and storage charges for the actual product. If you fulfil orders yourself, account for your own postage, packaging, handling, and storage. Optional advertising or software belongs on your worksheet too, even if your initial decision is to spend nothing on either.
For each uncertain figure, add a source, a date checked, and a next action. This makes your worksheet useful during short breaks: you can request one shipping quote today and check one packaging estimate tomorrow without losing track.
Estimate one sale before estimating a month
Pick a sample product idea and build a simple calculation. Start with the selling price, then subtract the product’s landed cost and estimated costs associated with that sale. Keep recurring overhead separate so you can see what remains to contribute toward it. Do not call that remainder take home profit. Returns, unsold inventory, overhead, and other costs can still change the overall result.
For illustration only, imagine a CAD thirty dollar sale with twelve dollars of landed product cost and ten dollars of estimated selling and fulfilment costs. Eight dollars remains before other expenses. Those numbers are invented for practice; they are not Amazon’s fee schedule or an earnings forecast. Replace every example amount with evidence before using the worksheet for a purchase decision.
Amazon’s Revenue Calculator can help compare Amazon fulfilment with your own fulfilment estimates. Enter accurate dimensions, weight, category, price, and relevant costs. Save the assumptions alongside the result. A calculator output is only as useful as the information entered, and it cannot promise demand.
Remember that profit and available cash differ
You can pay for stock before receiving money from customers. Reordering, returns, slow sales, or delayed availability of funds can make cash feel tight even when a spreadsheet looks encouraging. Draw a timeline showing when each payment leaves your account and when you expect funds to become available. Label estimates clearly. Avoid building a plan that requires every unit to sell immediately.
Then try a slower sales scenario. What happens if stock takes longer to move, shipping costs more, or some orders are returned? Record which commitments you could postpone. Set a review point before buying more inventory, rather than treating the first purchase as permission to keep spending.
Give the budget a weekly appointment
Spend twenty minutes each week comparing estimates with actual quotations or expenses. Keep receipts together, update unknown amounts, and note the next question to answer. Include your time: checking listings, handling customer issues, and tracking stock are work. Our article about fitting an Amazon business around family life can help you consider that commitment alongside your financial boundary.
You do not need perfect forecasts to begin learning. You need visible assumptions, a spending limit, and permission to pause when the numbers do not fit. This week, create your four cost buckets and identify three missing figures. Research those before choosing products or services.
For personal direction on what to learn next, complete the free Seller Readiness Assessment. Use it to reflect on your goals, available time, budget questions, and current knowledge before deciding your next step.