If you sell across multiple platforms and can’t answer "how much did I actually make last month," your bookkeeping is holding your business back. This guide walks through the tools resellers actually use to track cost-of-goods, platform fees, shipping costs, mileage, and net profit. No tool here is a magic tax solution. For anything tax-related, consult a licensed tax professional. What these tools do is give you the clean numbers your accountant or your own spreadsheet needs.
Disclaimer: This post is informational only and is not financial or tax advice. Consult a qualified tax professional for guidance specific to your situation.
What Resellers Actually Need to Track
Before picking any app, know what numbers matter. Resellers generally need to track four categories:
- Cost of goods sold (COGS): What you paid for each item, including sourcing trips and bundle purchases.
- Platform fees: Selling fees, payment processing fees, and subscription costs charged by each marketplace.
- Shipping and supplies: Postage, poly mailers, boxes, tape, printer ink.
- Operating expenses: Mileage to thrift stores, home office space, phone data used for the business.
Net profit is what remains after all four. If you only track what came in from sales, you will consistently overestimate how much you earned.
Spreadsheets: Still the Default for Many Resellers
Google Sheets and Excel remain the most widely used bookkeeping tools among resellers, particularly those just starting out or running a lean side hustle. The upside is full control: you build the columns you need and nothing more. A basic reseller spreadsheet typically includes columns for item description, purchase date, COGS, sale price, platform, fees paid, net profit, and days-to-sell.
The downside is manual entry. Every sale needs to be logged individually, and pulling totals at tax time requires either discipline throughout the year or a painful reconciliation in April. Pre-built Google Sheets templates designed for resellers circulate in reselling communities and can save setup time. Search for "reseller profit tracking spreadsheet" to find community versions.
Spreadsheets pair well with the reseller daily routine approach: log each sale the same day you ship it, and the data stays accurate without a big catch-up session.
Reseller-Specific Apps
Several apps are built with the reseller workflow in mind. They connect to platforms or let you manually log purchases and sales, then calculate profit automatically.
Seller Ledger is designed specifically for online sellers. It imports transactions from platforms including eBay, Poshmark, and Mercari and attempts to match sales with purchase costs. It handles platform fee calculations automatically for supported marketplaces.
Reseller’s Companion (also called Resell Report) is a popular mobile-first option. You log each item at purchase, scan barcodes if available, and record the sale when it closes. It shows profit per item and summary reports by period. It is iOS-focused.
Flipwise is another reseller-focused tracker that supports multiple platforms and generates profit/loss summaries. It has a free tier with limited items.
When evaluating any reseller-specific app, check two things: which platforms it syncs with automatically versus which require manual entry, and whether it handles multi-platform sales of the same item category cleanly.
General Small-Business Accounting Apps
Some resellers outgrow reseller-specific tools as volume increases and move to general accounting software.
Wave Accounting is free for core accounting features. You can connect bank accounts, categorize transactions, and run profit/loss reports. It does not have reseller-specific COGS tracking out of the box, but many resellers use it with manual COGS journal entries or a connected spreadsheet.
QuickBooks Self-Employed targets freelancers and side-hustle sellers. It separates business from personal expenses, tracks mileage via GPS, and produces a Schedule C summary at year end. It does not natively understand reseller item-level COGS without manual work.
FreshBooks skews toward service businesses but handles expense tracking and invoicing that some consignment resellers or wholesale flippers find useful.
General accounting apps are better at the financial reporting layer and worse at the "what did I pay for this specific item" layer that resellers need. The common workaround is using a reseller-specific tool for item-level tracking and exporting totals into the accounting app quarterly.
Mileage Tracking
If you drive to thrift stores, estate sales, or the post office for your resell business, that mileage is a deductible business expense in the United States. Many resellers undertrack this because it requires a log of every trip.
MileIQ and Everlance automatically log drives using your phone’s GPS. You swipe to mark each trip business or personal. At year end they produce a mileage report you hand to your accountant. Both have free tiers with a cap on logged drives per month.
Manual mileage logs in a spreadsheet or notes app also work. The IRS requires date, destination, purpose, and miles for each trip. A simple note after each sourcing run covers this.
What to Look for When Choosing a Tool
The right tool depends on your volume and the platforms you sell on. Ask these questions before committing:
- Does it sync with the platforms you actually use, or does everything require manual entry?
- Does it track COGS at the item level, or only totals?
- How does it handle fees from different platforms, which charge in different ways?
- Can you export data to a spreadsheet or hand it to an accountant easily?
- What does it cost, and is that sustainable at your current volume?
For sellers generating enough volume to receive a 1099-K, clean records are especially important. The reseller taxes and 1099-K guide covers what the form means and what counts as deductible for 2026.
How Bookkeeping Connects to Listing Volume
Bookkeeping clarity affects how many items you can profitably source and list. When you know your true net profit per item, you can set a minimum acceptable sell price before you source rather than after. Sellers who track this well tend to list more confidently because they know which price floors work.
The operational side of listing faster is separate from tracking profit, but they compound. If you can cut listing time using AI-assisted writing, you can redirect that time to sourcing or to logging your purchases the same day. See QuickListAI pricing for what each plan covers across ten marketplaces.
For resellers building toward higher volume, a clean bookkeeping system also makes it easier to track your cost of goods sold per item and spot categories where margins are compressing over time.
Write Listings in Seconds with QuickListAI
QuickListAI is a Chrome extension that writes and auto-fills marketplace listings across Poshmark, Depop, Mercari, eBay, Vinted, Grailed, Kidizen, and Whatnot. Spend less time typing, more time sourcing and tracking what matters. 2 free listings, no credit card required.
Add to Chrome, FreeFrequently asked questions
A spreadsheet works well at lower volumes and costs nothing. Dedicated apps earn their keep when manual entry becomes the bottleneck or when you need automatic platform fee calculations. Many high-volume resellers use both: a reseller-specific app for item-level tracking and accounting software for overall reporting.
Revenue is the total amount buyers paid you. Profit is what remains after subtracting your cost of goods, platform fees, shipping, and other business expenses. Tracking only revenue will significantly overstate what you actually earned.
No. These apps organize your numbers and generate reports, but filing taxes requires either tax software like TurboTax or a licensed tax professional. Consult a qualified accountant or CPA, especially once you receive a 1099-K or are running reselling as a primary income source.
Common deductible expenses include cost of goods sold, platform subscription fees, selling fees, shipping supplies, mileage driven for business, and a portion of your phone bill if used for the business. Consult a tax professional to confirm what applies to your specific situation. This post is not tax advice.
Item-level tracking gives you the most accurate profit picture and makes it easier to identify which categories perform best. It is more work than tracking only totals, but reseller-specific apps are designed to reduce that friction. At minimum, track COGS in batches if individual tracking is not feasible.
Compile your total revenue, COGS, platform fees, shipping costs, and other expenses into a summary. If you received one or more 1099-K forms, cross-reference them against your own records before sharing anything with an accountant. Keep all receipts and records for at least three years.