Search "home office deduction" and every guide says the same thing: the space has to be used exclusively for business, no exceptions. A reseller reads that, looks at the spare bedroom stacked with poly mailers and inventory bins that also holds the treadmill nobody uses, and concludes they don't qualify. That conclusion is usually wrong. There's a second rule, narrower and far less talked about, written specifically for businesses that store product — and it drops the exclusive-use requirement entirely for that part of the space.
The rule everyone quotes, and the one they skip
The general home office deduction requires a part of your home used exclusively and regularly as your principal place of business, or exclusively and regularly for the administrative and management side of the business if you don't have another fixed location where you do that work. A desk in the corner of a room you also use for guests doesn't pass "exclusive" — even occasional non-business use of that specific area disqualifies it. That's the rule that gets resellers to give up before checking further.
The IRS carves out a separate exception for one specific situation: storing inventory or product samples for a wholesale or retail business. Under that exception, the space doesn't have to be used exclusively for business — mixed use is fine — as long as four things are true: you sell products at wholesale or retail, your home is the only fixed location of that business, the space is used regularly (not occasionally) for storage, and it's a separately identifiable space, like a garage bay, a closet, or a defined section of a basement — not inventory scattered wherever it happened to land.
That's squarely what most eBay and Shopify resellers are doing: bins on garage shelving that also holds the lawnmower, a spare room that stores poly mailers next to the guest bed. The general rule says that fails. The storage exception says it doesn't, because storage was never subject to the exclusive-use test in the first place — it has its own test, and this is it.
What doesn't qualify
The sole-fixed-location condition is the one that trips people up. If you also rent a storage unit, a small warehouse bay, or any other off-site space for inventory, your home stops being the only fixed location and the storage exception no longer applies — even though the same square footage in your garage hasn't changed at all. A dedicated office space you use exclusively for listing and bookkeeping can still qualify separately under the general rule; it's specifically the non-exclusive storage exception that the off-site space knocks out.
And this exception is for sellers of physical product. A reseller qualifies. A consultant, freelancer, or service business doesn't get to use it to avoid the exclusive-use test just because their spare room also has a treadmill in it — that's still subject to the general rule.
One more thing worth knowing if OBBBA headlines have you second-guessing this: the One Big Beautiful Bill Act, signed July 2025, permanently killed the home-office deduction for W-2 employees working remotely — it made the 2018 suspension of that specific path permanent. It changed nothing for the self-employed. If you file a Schedule C, which every reseller running this as a business does, this deduction was never affected.
Two ways to calculate it, and they land very differently
- Simplified method: $5 per square foot of qualifying space, capped at
- 300 square feet, for a maximum deduction of $1,500. No expense
- tracking, no Form 8829. The IRS's own guidance on the simplified option
- confirms the storage exception carries over here too — the space still
- doesn't need to be exclusive, it just needs to count toward that 300-square-
- foot total, combined with any dedicated office space you also claim.
- Regular method (Form 8829): add up your actual home costs — mortgage
- interest or rent, property tax, homeowners or renters insurance, utilities,
- repairs, depreciation — and multiply by the percentage of your home's total
- square footage that your office and storage space together take up. No
- 300-square-foot ceiling, which matters a lot once storage is part of the
- math: a garage bay alone can easily blow past what the simplified method
- caps out at.
A worked example
Say your home is 2,000 square feet. You've got a 100-square-foot spare room used exclusively as an office, plus a 300-square-foot section of the garage — identifiable, shelved, used regularly for inventory, but the rest of the garage still holds the car and the holiday decorations. That's 400 square feet total, 20% of the home.
- Simplified method: capped at 300 of your 400 qualifying square feet.
- 300 × $5 = $1,500, the max regardless of the extra 100 square feet.
- Regular method: say your annual mortgage interest, property tax,
- insurance, utilities, and repairs add up to $24,000. 20% × $24,000 =
- $4,800.
That's a $3,300 gap in this example, purely because the simplified method's flat cap doesn't scale with a garage full of inventory the way the regular method does. The trade-off: the regular method means tracking real expenses all year and filing Form 8829, and claiming actual home depreciation creates depreciation recapture — a piece of that deduction gets taxed back when you eventually sell the home, at a top rate of 25% on the recaptured amount. Simplified-method users skip that recapture entirely, which is part of why the IRS built it as an option and not a replacement.
What to actually do
- Don't rule yourself out because the space isn't exclusive. If it's
- inventory storage specifically, and your home is your only business
- location, mixed use is allowed for that part of the space.
- **Keep a dedicated, exclusive office area separate from storage if you
- can.** It qualifies under the general rule and stacks with the storage
- square footage under either calculation method.
- Measure and photograph the storage space, and note that it's used
- regularly. "Separately identifiable" and "regular use" are the two things
- worth being able to show if it's ever questioned — a defined shelving
- section, not a pile that moves around the house.
- Run both methods before you file. The simplified method is faster and
- avoids depreciation recapture; the regular method is very likely worth the
- extra paperwork the moment your storage footprint pushes past what $1,500
- at the simplified rate would cover.
- If you rent any off-site storage or warehouse space, re-check this.
- It breaks the sole-fixed-location condition for the storage exception,
- even though nothing about your home changed.
PalmFlow's Expenses ledger has an Office category alongside Mileage, Supplies, and the rest of what doesn't attach to a single item — log what you calculate for the year and it flows into your real net profit instead of sitting in a spreadsheet until tax season. Expenses is part of the paid plans; the free plan still covers per-item cost basis and fees on 50 items, no card.
Disclaimer: this is general information, not tax advice. The exclusive-use test, the inventory storage exception, and the simplified-method rate are current federal rules as of 2026, but eligibility depends on your specific setup — confirm your situation with a CPA or IRS Publication 587 before you claim it.