Most phone resellers making $5K-$20K/month have the same problem: they track what they buy and sell phones for, but completely ignore every other expense eating into their profit.

Here's why — and the fix is simpler than you think.

The mistake: Not categorizing your business expenses in QuickBooks.

You know what you paid for a phone and what you sold it for. Great. But what about the $40/month you spend on shipping supplies? The $200 in gas driving to meetups? The eBay and Swappa seller fees? Phone repair tools? That extra phone line you use for business? Your home office space?

If those are sitting in one big "expenses" bucket — or worse, not tracked at all — you're overpaying on taxes and have no clue where your money is actually going.

The 5-minute fix:

1. Set up expense categories in QuickBooks: Shipping & Supplies, Platform Fees, Travel & Mileage, Repairs & Tools, Software & Subscriptions

2. Every expense gets tagged to the right category — takes 10 seconds per transaction

3. Connect your business bank account/credit card so most of it auto-imports

4. Now your P&L shows exactly where the money goes, and your tax deductions are ready to go

This one change usually saves resellers $1,000-$3,000/year in missed deductions alone. And it takes less than 5 minutes a week once it's set up.

Most resellers doing $10K+/month are shocked when they see how much profit they're leaking to uncategorized expenses. Don't be one of them.

I built a full system for this inside Reseller Accounting Hub — QuickBooks setup, expense categorization, inventory tracking, and quarterly tax prep designed specifically for phone resellers. If your books are a mess, come fix them.