When you first start reselling, keeping track of inventory may seem easy. You buy a few items, list them for sale, and remember roughly what you paid for each one.
That works—until it doesn't.
After a few trips to thrift stores, garage sales, flea markets, estate sales, or other places where you find inventory, it can become surprisingly difficult to remember what you bought, what you paid, what has sold, and what is still sitting somewhere waiting for a buyer.
You don't need a complicated inventory management system to solve the problem. Even if you only sell a few items each week, developing a simple habit for recording your purchases can make your reselling activity much easier to manage.
Start with the basics
Why Keep Track of Your Resale Inventory?
One of the easiest mistakes to make when you are new to reselling is relying on memory.
Suppose you find a lamp at a garage sale and pay $8 for it. A month later, someone offers you $20.
Is that a good sale?
Probably—but do you remember exactly what you paid for it?
Did you spend another $4 replacing the lampshade? How long have you owned it? Did you originally pay $8, or was that another item you bought that day?
Multiply that by 20 or 30 purchases and remembering the details becomes much more difficult.
Keeping basic inventory records allows you to answer questions such as:
- What items do I currently have available to sell?
- How much did I pay for an item?
- When and where did I buy it?
- How long have I owned it?
- What did it eventually sell for?
- Did I spend additional money preparing it for sale?
- Did I actually make money when I sold it?
You don't need to track every imaginable detail. You need enough information to make your records useful.
Keep it manageable
What Information Should You Keep Track Of?
For someone just getting started, keep it simple.
At a minimum, consider recording:
Item Name or Description
Use enough information that you'll recognize the item later.
Instead of simply writing Lamp, something like Blue Ceramic Table Lamp will be much easier to identify when you have several similar items.
Purchase Date
Record when you acquired the item.
Besides creating a purchase history, this can eventually help you recognize inventory that has been sitting for a long time.
Purchase Price
Record what you actually paid.
This is one of the most important numbers in your inventory records because you cannot accurately determine your profit later if you do not know what the item originally cost.
Quantity
Sometimes one purchase gives you more than one item.
If you purchase ten similar items together, for example, recording the quantity helps you keep track of how many you started with and how many remain.
Where You Bought It
This could be a thrift store, garage sale, flea market, estate sale, auction, wholesale source, or anywhere else you regularly find things to resell.
Keeping track of your sources can eventually help you recognize where you tend to find your best inventory.
Current Status
At its simplest, you need to know whether you still have the item or whether it has sold.
As your inventory grows, this becomes much more useful than trying to remember what is sitting in a closet, garage, spare room, storage area, or booth.
Build the habit
Record the Item When You Buy It
The best inventory system is not necessarily the most sophisticated one.
It's the one you actually keep updated.
Record an item when you acquire it—not several days or weeks later when you're trying to remember what you paid.
It is easy to put everything in the garage and tell yourself you'll enter the information later.
A few days later, you may remember buying the items but not remember whether one cost $5, $7, or $10. If you visited several garage sales that morning, you might not even remember where each item came from.
Recording the purchase while the information is fresh only takes a moment.
The same principle applies when something sells. Update your records while you still have the sale information in front of you.
Use what works
Choose a Tracking Method That Fits How Much You Sell
There isn't one correct way to keep inventory records.
The best method depends partly on how often you buy and sell.
Notebook or Paper
If you only resell an occasional item, a notebook may be enough.
It is inexpensive, easy to understand, and requires no software.
Spreadsheet
A spreadsheet is a natural next step for many resellers.
It is flexible and can work very well for a small reselling business.
Inventory Tracking Software
Dedicated inventory software can make sense when you want your purchases, available inventory, sales, and related information organized without maintaining your own spreadsheet.
That does not mean you need software just because you sold your first item.
If a notebook works for you, use a notebook. If you enjoy working with spreadsheets and your spreadsheet does everything you need, keep using it.
Consider changing your system when your current method starts creating more work than it saves.
Understand the real cost
Don't Forget Costs Beyond the Purchase Price
Purchase price is important, but sometimes it isn't the only money you put into an item.
Imagine you purchase a small table for $15 and sell it for $45.
At first glance, it may look like you made $30.
But perhaps you also spent $6 on materials specifically needed to prepare that table for sale.
Your actual numbers look different once that additional cost is included.
This does not mean you need to obsess over every penny or make record keeping unnecessarily complicated.
The goal is simply to avoid forgetting meaningful expenses that affect whether an item was actually profitable.
Read What Expenses Should a Reseller Keep Track Of? for a simple breakdown of item-related costs, general business expenses, selling fees, and other expenses worth recording.
Your history has value
Keep a Record After an Item Sells
When something sells, don't delete it from your records.
Your sold inventory can eventually become some of your most useful information.
Record information such as:
- Sale date
- Sale amount
- Quantity sold, when applicable
- Any item-related expenses you tracked
Over time, those records can help you understand which types of items have been worthwhile and which ones haven't.
For example, you may discover that a category of items you enjoy buying regularly takes months to sell and produces very little profit.
Another type of item may consistently sell quickly and provide a better return.
You cannot easily recognize those patterns if the record disappears as soon as the item leaves your hands.
Don't overcomplicate it
Keep Your System Simple Enough to Use
It is easy to create an inventory system with dozens of fields for information you might someday want.
That does not necessarily make it better.
For a smaller reseller, the goal should be to collect enough information to answer the questions that matter without making every purchase feel like paperwork.
What did I buy? When did I buy it? What did I pay? How many did I buy? Where did I get it? Do I still have it? If it sold, what did it sell for?
You can always track additional information later when you discover that it would actually be useful.
A simple system that you update consistently is far more valuable than an elaborate system you stop using after three weeks.
Know when you've outgrown your method
When Does Inventory Tracking Software Become Useful?
There isn't a specific number of monthly sales where you suddenly need inventory software.
Instead, pay attention to your current record-keeping process.
You may be ready for a dedicated tracking system when you regularly find yourself:
- Searching through old notes to find purchase prices
- Trying to remember whether an item has already sold
- Maintaining several spreadsheets or lists
- Losing track of quantities
- Wondering how much available inventory you currently own
- Having difficulty figuring out what you actually made after an item sold
If none of those things are happening, your existing method may be working just fine.
If they are happening, a dedicated system may make record keeping easier.
Putting the process into practice
How Buy Sell Tracker Approaches Resale Inventory
Buy Sell Tracker was designed for part-time and small-scale resellers who want a straightforward way to keep their records organized.
Rather than requiring a complicated inventory management process, you can record the basic information about an item when you purchase it, keep track of available quantities, record sales, add related expenses when needed, and review the results through reports.
The goal is not to make a small reseller operate like a large retail business.
It's to make answering a much simpler question easier:
Final thought
Start With a System You Can Maintain
You don't need perfect records or complicated software to begin keeping better track of the things you resell.
Choose a method that fits the amount of inventory you're currently handling. Record purchases when you make them. Update your records when something sells.
Keep enough information to understand what you paid and what you eventually made.
If your reselling activity grows, your tracking system can grow with it.
The important part is simply getting into the habit of keeping the records in the first place.