The number to watch
Attachment rate on accessories. Handset and appliance margins are thin, and what makes an electronics counter profitable is what goes out alongside the main item. The figure to look at is how many sales carried an accessory line, which the sales report answers per item. Most shops find it is far lower than they assumed and that the fix is stock placement rather than price.
Serial numbers and warranty
Electronics come back — for a warranty claim, a service, or a replacement — and the first thing anybody asks for is the invoice. Recording the model and serial number on the bill means you can find it by party, date or item in seconds and deal with the manufacturer properly. Shops that cannot find the bill absorb the replacement themselves, which is a large cost for something a search would have answered.
Model-wise stock, not category-wise
A television is not a stock item; a specific model in a specific size is. Keeping stock at model level is what lets you answer whether you have the 43-inch of that series without walking the godown, and it stops the margin error of billing a higher model at the rate of the one below it. It also makes the reorder decision readable rather than a guess.
Exchange, EMI and part payment
A sale here is often not a single payment — an exchange value, a card payment, a finance approval and some cash. Recording each mode separately rather than as one total means the day-end cash actually ties and you can see which payment routes your customers use. Where part of the amount is on credit, it goes to the party ledger rather than being remembered.