A freelance photographer buys a $3,000 camera body for family trips. Two years later, she launches a photography business and starts using that same camera on every paid shoot. When tax season rolls around, she does the obvious thing: she writes off $3,000 as a business asset.
The IRS disagrees. By the time she started using the camera for work, it was worth maybe $1,400 on the used market. That $1,400 — not the $3,000 she originally paid — is almost always the number she's allowed to depreciate.
This mistake is everywhere among freelancers, consultants, and small business owners who start a business using stuff they already own: laptops, vehicles, tools, furniture, cameras, even a spare bedroom. The rule that trips people up has a name — the "lower of cost or fair market value" rule — and it's one of the more counterintuitive corners of the tax code.
The Core Rule: Lower of Cost or Fair Market Value
When you convert property from personal use to business use, IRS Publication 946 sets your depreciable basis at the lesser of:
- The property's fair market value (FMV) on the date you start using it for business, or
- Your adjusted original cost (what you paid, plus any improvements, minus any casualty losses you already claimed)
In plain terms: if the thing you bought has lost value since you bought it — which is true of almost every laptop, car, or piece of equipment — you depreciate the current worth, not the receipt.
The logic makes sense once you see it from the IRS's perspective. The depreciation deduction exists to let a business recover the cost of an asset used to generate income. But you didn't buy that camera to generate business income — you bought it as a consumer. The value that "enters" the business is only what the asset is actually worth on the day it starts working for the business, not what you paid for it back when it was a personal purchase.
A Worked Example
Say you bought a used pickup truck for $28,000 three years ago, purely for personal driving. Today you start a landscaping business and begin using that truck for job sites and hauling equipment. On the day you convert it to business use, comparable trucks are selling for $17,000.
Your depreciable basis is $17,000 — not $28,000. You lose access to $11,000 of value for depreciation purposes, permanently. There's no adjustment, no catch-up, no way to recapture that gap later.
Contrast that with a scenario where the asset appreciated — say a piece of vintage equipment or a rare collectible now used in a business. In that case, your original cost caps the depreciable basis; you don't get to depreciate based on the higher current value, because the rule is lower of the two.
No Retroactive Depreciation for the Personal-Use Years
A related point that surprises people: you get zero depreciation credit for the years you owned the item personally, even though it was declining in value the entire time. The clock starts on the date you place the property "in service" for business use — not the date you originally acquired it.
This is why documenting the conversion date precisely matters. If you start freelancing in March but don't formally start billing clients with your laptop until June, the FMV on the actual in-service date is what counts, and a few months of depreciation can shift meaningfully for fast-depreciating electronics.
The Section 179 Trap
Here's the detail that catches even people who've heard of the "lower of cost or FMV" rule: converted personal property is not eligible for the Section 179 deduction.
Section 179 lets businesses expense the full cost of qualifying equipment in the year it's placed in service, instead of depreciating it over several years — a hugely popular deduction because it's fast and simple. But the IRS carves out an exception specifically for property that was originally acquired for personal use and later converted to business use. You cannot Section 179 it.
What you can still use:
- Standard MACRS depreciation — spreading the (lower-of) basis out over the asset's useful life (typically 5 years for computers and vehicles, 7 years for most office furniture and equipment).
- Bonus depreciation — which, unlike Section 179, generally remains available for converted property and can still let you deduct a large share of the basis in the first year.
If you were planning to write off that home office desk or work truck in one shot the way you'd Section 179 a brand-new purchase, budget for bonus depreciation or multi-year MACRS instead — the cash-flow timing of your deduction will look different than you expect.
Vehicles, Computers, and Mixed Personal Use
Cars, computers, and similar dual-purpose items carry an extra layer of rules as "listed property." If you don't use the converted asset 100% for business — say your laptop is still 30% for personal browsing and streaming — your depreciation deduction is reduced by that personal-use percentage, every year, for as long as you own it. You need a reasonable, documented estimate of business-use percentage (a mileage log for a vehicle, a rough hours-used breakdown for a computer), and it's worth revisiting that estimate annually since usage patterns shift.
If personal use ever creeps above 50%, listed property loses eligibility for accelerated depreciation methods altogether, reverting to slower straight-line depreciation — another reason to keep contemporaneous usage records rather than reconstructing them at tax time.
Establishing Fair Market Value (Without Guessing)
The single biggest audit-risk element of this whole process is the FMV figure, because it's the number you're choosing, not one printed on a receipt. Reasonable ways to support it:
- Comparable sales — a screenshot or printout of similar items (same make, model, age, condition) selling on eBay, Facebook Marketplace, or a dealer listing, dated close to your conversion date.
- A professional appraisal — worthwhile for higher-value items like specialized equipment, art, or real estate, where informal comps are harder to find.
- Published valuation guides — Kelley Blue Book or NADA for vehicles is standard and well-accepted by the IRS.
- Depreciation-adjusted cost as a sanity check — even though you won't use this number as your basis if FMV is lower, calculating it helps you spot an FMV estimate that's unreasonably low or high.
Keep whatever evidence you use in your records. If the IRS ever questions the basis, "I just estimated it" isn't nearly as defensible as a dated printout of three comparable listings.
What to Track Before You Convert Anything
Before you start depreciating a converted asset, gather:
- Original purchase date and price (receipt, credit card statement, or purchase confirmation)
- The exact date business use began — this is your "placed in service" date
- FMV documentation as of that date — comps, an appraisal, or a valuation guide printout
- A record of any improvements since purchase (which increase the adjusted cost side of the comparison) or casualty losses already deducted (which decrease it)
- An honest business-use percentage estimate, with a way to keep updating it (mileage log, usage log)
Why This Matters More Than It Looks
For a lot of new freelancers and solo business owners, converted personal property — the laptop, the car, the tools already sitting in the garage — makes up a real share of their early "startup costs," even though no cash changed hands when the business began. Getting the basis wrong doesn't just cost you a deduction; overstating it is the kind of clean, easily-checked error that stands out in a review, because the IRS can pull the same comparable-sales data you should have used to set the FMV honestly in the first place.
Keep Your Finances Organized from Day One
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