How to Track Your Reselling Profits Properly (And Why Most Flippers Get It Wrong)

Most resellers significantly overestimate their profits because they only track two numbers: what they paid and what they sold for. The real costs — entry fees, petrol, packaging, platform fees — eat into margins far more than people realise.

Here's how to track everything properly so you know your actual numbers.

What hidden costs do most resellers forget?

A typical car boot sale item bought for £3 and sold for £25 has at least 6 hidden costs that most flippers never track.

• Entry fee: £1-5 per market visit
• Petrol/transport: £5-15 round trip (shared across items bought)
• Parking: £2-5 at many venues
• Packaging: £1-3 per item (bubble wrap, boxes, tape)
• Postage: £3-5 if offering "free" delivery
• Platform fees: eBay charges a 12.8% final value fee (see eBay UK fee schedule), Vinted adds a buyer protection fee of ~5%, PayPal takes 2-3%

That £25 sale? After £16.25 in real costs, your actual profit is £8.75 — not £22. Still decent at 35% margin, but a very different number.

Why does tracking reselling expenses matter so much?

According to reselling communities on Reddit (r/Flipping, r/FlippingUK), many new resellers quit within 6 months because they think they're not making money. Many actually are profitable — they just can't see it because they don't track.

Conversely, some resellers think they're profitable but are actually losing money once expenses are counted. Without data, you can't tell the difference between a good month and a bad one.

The items that don't sell still carry costs: purchase price tied up, entry fee already paid, storage space consumed.

What should I track and when should I track it?

The golden rule: track it at the point it happens. Waiting until you get home means forgetting half of it. According to the Ebbinghaus forgetting curve, people forget roughly 50% of new information within 1 hour.

At the point of purchase

• Photo of the item (takes 2 seconds)
• Price paid
• Which market and seller
• Entry fee for that venue

When you list it

• Which platforms (eBay, Vinted, Facebook, etc.)
• Date listed — so you can track days-to-sell

When it sells

• Sale price and platform
• Payment method (cash, bank, PayPal)
• Postage cost if applicable

Per trip (ongoing)

• Transport costs (petrol, bus, train)
• Packaging supplies
• Other business costs (labels, printer ink)

Is a spreadsheet or a dedicated app better for tracking?

Most resellers start with Google Sheets or Excel. It works for low volumes but has real problems at scale:

• Painful on mobile — opening a spreadsheet at a car boot sale at 7am is friction that kills consistency
• No photo support — you end up with a folder of images disconnected from your data
• Manual formulas — profit calculations, expense breakdowns, and days-to-sell all need custom formulas that break
• Gets unwieldy — past 200+ items, spreadsheets become slow and error-prone

A dedicated reseller app solves these by letting you snap a photo, enter the price, and move on in under 10 seconds.

What numbers should resellers actually focus on?

Once you're tracking properly, these 5 metrics tell you everything:

• Net profit per month — revenue minus ALL costs. The only number that matters
• Average days to sell — if it's rising, you're buying the wrong things. Top resellers average 14-21 days
• Cost per sourcing trip — entry + transport + items. Tells you which markets are worth visiting
• Sell-through rate — percentage of items bought that actually sell. Below 70% means you need to be pickier
• Profit per item — your average margin. Below £5-10 per item and you're spending too much time on low-value flips

How do I start tracking if I've never done it before?

Don't try to track everything perfectly from day one. Start with just 3 things:

1. Photo + price for every purchase
2. Entry fee for every market visit
3. Sale price when something sells

Even these basics give you a massively better picture of actual profitability. Add transport costs and platform tracking once the habit is built.

The resellers who make real money aren't necessarily the ones who find the best items — they're the ones who know their numbers.

Frequently asked questions

What is the best way to track reselling profits?

Track every item at the point of purchase with a photo and price. Log entry fees and transport per trip. Record the sale price and platform when you sell. Use an app or spreadsheet that calculates net profit after all expenses — not just buy vs sell price.

What expenses do resellers forget to track?

Entry fees (£1-5), petrol/transport (£5-15), parking (£2-5), packaging (£1-3), postage (£3-5), and platform fees (eBay 12-13%, Vinted ~5%). These hidden costs often cut perceived profit in half or more.

How do I calculate my real profit from reselling?

Real profit = Sale price minus purchase price minus all expenses (entry fee share, transport share, packaging, postage, platform fees). An item bought for £3 and sold for £25 on eBay might yield only £8.75 real profit.

Should I use a spreadsheet or an app?

Spreadsheets work under 20 items/month. Above that, a dedicated app saves time and reduces errors. The key is using something you'll actually stick with at 7am at a rainy car boot sale.