Record Keeping for Online Sellers: What to Track and Why

Good record keeping is the single most important habit you can develop as a reseller. Whether you sell on eBay, Poshmark, Depop, Vinted, or Etsy, your records are what stand between you and an organised tax filing — or between you and a painful audit. This guide covers exactly what to track, how long to keep it, the best storage strategies, and how to pull reports from every major reselling platform.

Why Record Keeping Matters

You might think tracking every purchase receipt and shipping cost is overkill, especially when you are starting out. But there are several compelling reasons to build this habit from day one:

• Tax compliance: You cannot accurately file your tax return without records of income, expenses, and inventory. Guessing leads to overpaying or underpaying — both are problems.
• Audit protection: If the IRS or HMRC audits you, the burden of proof is on you. Without records, deductions can be disallowed entirely, and you may face penalties and interest on top of additional tax owed.
• Business intelligence: Records tell you which items, categories, and platforms are most profitable. You cannot improve what you do not measure.
• Profitability clarity: Many resellers think they are making money when they are actually losing it after accounting for all costs. Proper records reveal the truth.
• Legal protection: If a buyer disputes a transaction or files a chargeback, your records serve as evidence.

What to Track: The Complete List

Purchase Records

Every item you buy for resale needs a record. This documentation proves your cost basis and is essential for calculating cost of goods sold (COGS):

• Date of purchase
• Source/vendor: Thrift store name, estate sale address, liquidation auction, online marketplace
• Item description: Brief description sufficient to match to a future sale
• Purchase price: What you paid for the item
• Payment method: Cash, credit card, PayPal — this helps cross-reference with bank statements
• Receipt or proof of purchase: Photo, email confirmation, or written log

For thrift store hauls where you buy 15 items at once, you do not need a separate receipt per item. A single receipt with a note listing the items and their individual costs (or an allocated cost from the total) is sufficient.

Sales Records

Platforms like eBay, Depop, and Poshmark track your sales automatically, but you should maintain your own records as well:

• Date of sale
• Platform: Which marketplace the item sold on
• Item description: Matching your purchase record
• Sale price: The price the buyer paid
• Shipping charged to buyer
• Platform fees deducted
• Net payout: The amount you actually received
• Original cost: Cross-referenced from your purchase records
• Profit/loss: Net payout minus original cost minus any additional expenses for that item

Maintaining your own sales log alongside platform data lets you catch discrepancies, track profitability per item, and have a backup if platform data becomes inaccessible. Tools like ListingGenie can help you manage listings across multiple platforms while keeping your sales data centralised.

Shipping Cost Records

• Shipping label costs (per-item outbound shipping)
• Packaging materials purchased (receipts or invoices)
• Shipping insurance premiums
• Returns and reshipping costs

Platform Fee Statements

Download your monthly or annual fee statements from each platform. These include:

• Final value fees or commission charges
• Listing fees and upgrade fees
• Promoted listing advertising costs
• Store subscription fees
• Payment processing fees

Mileage and Travel Logs

If you drive to source inventory at thrift stores, estate sales, flea markets, or auctions, keep a contemporaneous mileage log:

• Date
• Starting point and destination
• Business purpose: "Sourcing inventory at Goodwill on Main St"
• Round-trip miles driven

The IRS specifically requires mileage records to be made at or near the time of the trip, not reconstructed at year-end. Use an app like MileIQ or Stride to automate this.

Home Office Documentation

If you claim a home office deduction, keep:

• Measurements of your dedicated workspace and total home square footage
• Rent or mortgage interest statements
• Utility bills (electricity, heating, internet)
• Homeowner's or renter's insurance statements
• Photos of your workspace to demonstrate it is used regularly and exclusively for business

Bank and Payment Records

• Monthly bank statements for your business account
• Credit card statements for your business card
• PayPal transaction history and annual statements
• Platform payout records
• 1099-K forms received from platforms

How Long to Keep Records

Record retention requirements differ between the US and UK, and the rules are more nuanced than most people realise.

United States

Practical recommendation: Keep all tax-related records for 7 years. This covers the worst-case audit scenario (short of fraud) and gives you a comfortable buffer. Digital storage is cheap — there is little reason to delete records sooner.

United Kingdom

HMRC requires you to keep records for at least 5 years after the 31 January submission deadline of the relevant tax year. For example, for the 2025-26 tax year (ending 5 April 2026), the Self Assessment deadline is 31 January 2027, so you must keep records until at least 31 January 2032.

If HMRC opens an investigation, they may request records going back further, so keeping records for 6-7 years is advisable.

Digital vs Physical Records

Digital Records (Recommended)

Both the IRS and HMRC accept digital copies of receipts and records. Digital storage offers significant advantages for resellers:

• Searchability: Find any receipt or record in seconds using file names or folder structure
• Durability: Digital files do not fade, get water-damaged, or become illegible
• Space efficiency: No boxes of paper filling your home office or storage unit
• Backup capability: Multiple copies in multiple locations protect against loss
• Accessibility: Access records from any device, anywhere, anytime

Recommended folder structure:

• Business Records (root folder)
  • 2026
    • Purchase Receipts
      • 01-January
      • 02-February
      • (etc.)
    • Sales Reports
      • eBay
      • Poshmark
      • Depop
      • Vinted
    • Expense Receipts
      • Shipping Supplies
      • Equipment
      • Software
      • Other
    • Platform Fee Statements
    • Mileage Logs
    • Bank Statements
    • Tax Returns and 1099s

Physical Records

Some records may still arrive in physical form. For these:

• Photograph or scan them immediately before they fade
• Store originals in labelled folders by year if you want physical backups
• Keep in a fireproof container or safe for important documents (tax returns, business registration documents)

Cloud Backup Strategies

Your records are only as safe as your backup strategy. A single copy on your phone is not adequate. Implement the 3-2-1 backup rule:

• 3 copies of your data
• 2 different storage types (cloud + local drive)
• 1 offsite copy (cloud storage qualifies)

Recommended cloud storage options:

• Google Drive (15 GB free): Excellent for most resellers. Integrates with Google Sheets for expense tracking. Easily shareable with an accountant.
• Dropbox (2 GB free, $11.99/month for 2 TB): Strong file organisation and sharing features. Good desktop sync.
• iCloud (5 GB free, $0.99/month for 50 GB): Seamless for Apple users. Photos taken on iPhone sync automatically.
• OneDrive (5 GB free, included with Microsoft 365): Integrates well with Excel for spreadsheet-based tracking.

For most resellers, Google Drive's free 15 GB tier is more than sufficient for years of receipt photos, sales reports, and expense records. Set up automatic photo backup from your phone to ensure receipt photos are stored immediately.

Platform-Specific Export Tools

Each reselling platform provides tools to download your sales and fee data. Here is how to access them.

eBay Seller Hub Reports

eBay provides the most comprehensive reporting tools of any reselling platform:

• Navigate to Seller Hub > Performance > Reports
• Transaction report: Detailed breakdown of every sale including item price, shipping, fees, and net payout
• Payout report: Shows actual payments deposited to your bank account
• Monthly invoice: Summary of all eBay fees charged during the month
• 1099-K: Available in January for the prior tax year (if you meet the threshold)
• Reports can be downloaded as CSV files and imported into spreadsheets or accounting software

Download your eBay transaction report monthly and reconcile it against your own records. This catches any discrepancies early rather than at tax time.

Poshmark Sales Reports

• Go to My Seller Tools > My Sales Report
• Export your sales data as a CSV file
• Includes sale date, item title, sale price, commission charged, and net earnings
• Annual tax documents available in your account settings

Depop Data Export

• Access your sales through Profile > Selling
• Depop provides receipts for each transaction via email
• For a bulk export, contact Depop support or use a third-party tool to compile sales data
• Save email receipts in a dedicated folder for easy reference

Etsy Financial Statements

• Navigate to Shop Manager > Finances > Payment account
• Monthly statements: Detailed breakdown of fees, sales, and deposits
• CSV download: Export transaction-level data for any date range
• 1099-K: Available in your tax documents section
• Etsy also provides a legal and tax information page with annual summaries

Vinted Sales History

• Access via Profile > My Orders > Sold items
• Each sale shows the item price, shipping details, and any fees
• Vinted does not currently offer bulk CSV exports in all markets — you may need to compile data manually or use screenshots
• Save confirmation emails as backup documentation

Mercari Sales Data

• Go to Account > Selling > Completed
• Each transaction shows sale price, fees, and earnings
• Tax documents and 1099-K available in account settings annually

Building a Record-Keeping Routine

The best record-keeping system is one you actually use consistently. Here is a practical weekly routine that takes about 30 minutes:

• Daily (2 minutes): Photograph all purchase receipts immediately after sourcing trips
• Weekly (20 minutes): Log all purchases and expenses into your tracking spreadsheet or software. Categorise any uncategorised bank transactions. File receipt photos into the correct monthly folder.
• Monthly (30 minutes): Download platform sales reports and fee statements. Reconcile platform payouts against bank deposits. Review mileage log for completeness. Back up your records folder.
• Quarterly (1 hour): Calculate estimated tax payment. Review expense categories for any missed deductions. Count and value unsold inventory. Make estimated tax payment if required.
• Annually (2-3 hours): Download annual reports from all platforms. Complete end-of-year inventory count. Compile final expense totals by category. Prepare or deliver information to your tax preparer.

Common Record-Keeping Mistakes

• Waiting until tax time: Trying to reconstruct a year of records in January or March is stressful, time-consuming, and leads to missed deductions. Track as you go.
• Not separating personal and business transactions: Mixing personal and business purchases on the same card makes categorisation a nightmare and weakens your audit position.
• Relying solely on platform data: Platforms can change their interfaces, lose data, or become inaccessible. Always maintain your own independent records.
• Forgetting cash purchases: Cash spent at garage sales, flea markets, and thrift stores is still deductible — but only if you record it at the time of purchase.
• Not tracking return shipping costs: When a buyer returns an item and you pay return shipping, that cost is deductible. Many resellers forget to log these.
• Ignoring unsold inventory: Your ending inventory value affects your COGS calculation. An annual inventory count is essential for accurate tax reporting.

Frequently Asked Questions

• Do I really need to keep records if all my sales are on one platform?

  Yes. Even if eBay or Poshmark tracks your sales, you still need to document your purchase costs (COGS), expenses, and mileage. The platform only records the sale side of each transaction, not your costs. Without purchase records, you cannot prove your deductions.

• Can I use screenshots instead of downloaded reports?

  Screenshots are acceptable as supporting documentation, but downloaded CSV files and official statements are stronger evidence. Screenshots can be difficult to verify and may not capture all relevant data. Always download official reports when available.

• What if I started selling and did not keep records from the beginning?

  Start keeping records immediately going forward. For past transactions, reconstruct what you can using bank statements, credit card records, platform sales history, and emails. Going forward, the IRS and HMRC accept records made at or near the time of the transaction, so today is the best day to start.

• Should I keep records for items I gave away or donated?

  Yes. If you donate unsold inventory, you may be able to claim a charitable deduction for the fair market value. Keep records of the original purchase cost, the items donated, the charity name, and any receipt they provide. For donations over $250, you need a written acknowledgement from the charity.

• How do I handle records for items sold in different currencies?

  Record the sale in the original currency and note the exchange rate at the time of the transaction. Your bank or payment processor (PayPal) will show the converted amount. Use the converted amount for your tax return. Keep records of both the original and converted amounts.

• Is there a penalty for poor record keeping?

  There is no specific penalty for poor records alone, but poor records lead to inaccurate returns, which can trigger penalties. If audited and you cannot substantiate deductions, those deductions are disallowed and you owe additional tax plus interest. In serious cases, the IRS can add a negligence penalty of 20% of the underpayment.