Quickbooks might work if you can learn to cut and paste the columns of a CSV file within Excel.
Get the data arranged how Quickbooks expects it to be organized.
The software you desire to handle 3 platforms might not exist.
You should become intermediate to advanced in using Excel or equivalent spreadsheet software.
I use two Notepad files that I can load into Excel, if needed.
A) I make an entry into filename Items Listed every time I list something for sale.
It has 5 columns and I make a few hundred entries per year.
Auction number, Quantity, Date, Manufacturer Part Number, Description
I can search by part number to see the history of an item.
B) I make an entry into filename Sold Items every time I sell an item.
It has 5 columns and I make 7 entries a day or 2,500 entries a year.
Sales Order Number, Auction Number, Manufacturer Part Number, Description and Quantity Remaining
I could operate with just 2 columns, Manufacturer Part Number, Quantity Remaining
The last column (usually blank) could have Relist 12 Red Factory Sealed, Get from Storage Unit, Discontinued or Need Photo
I can manage items as they become Low Stock or Out of Stock.
C) I download the 12 monthly eBay and Paypal CSV (comma separated values) files into Excel.
Otherwise I load 2 yearly files.
I can sort several times by sender, receiver, type or whatever.
Then I put one of these categories into a blank column, sort again and total it up.
+ Payments received
- Paypal fees
- eBay Fees
- Sales Tax
- Refunds
- Postage
- Electric
- Phone
- Rent
- Supplies like boxes
- Inventory to resell
= EBITDA
D) I enter the numbers into a Schedule C and then file a 1040.
