Why It Matters
You've placed new appliances, smart locks, or furnishings into a short-term rental and you want the tax write-off now — not spread over five or seven years. Here's how it works: you elect the Section 179 deduction on Form 4562 when you file your return, and you can write off up to $1,160,000 of qualifying property placed in service in 2024. The catch is the income limitation — §179 can't reduce your taxable income below zero from active business activities. If your deduction exceeds that income, the unused amount carries forward indefinitely to future years. It's a powerful accelerator, but it's not the same as bonus depreciation, which has no income restriction.
At a Glance
- What it is: The actual deduction claimed by electing IRC §179 on Form 4562, Part I
- 2024 limit: $1,160,000 per entity (phase-out starts at $2,890,000 of property placed in service)
- Income limitation: Cannot exceed net taxable income from active business — cannot create a loss
- Unused amounts: Carry forward indefinitely with no expiration date
- Key distinction: Bonus depreciation has no income limitation; §179 does
- Recapture risk: Selling §179 property triggers ordinary income tax on the amount previously expensed
How It Works
Electing the deduction on Form 4562. The Section 179 deduction doesn't happen automatically — you have to elect it. On a timely filed return (including extensions), you complete Part I of Form 4562, listing each asset, its cost, and the §179 amount you're claiming. The election applies asset by asset, so you can expense some items under §179 and depreciate others normally. If your income is low this year, expense only what your income supports and carry the rest forward.
The income limitation — the part most investors miss. Here's what separates §179 from bonus depreciation: your deduction cannot exceed your net taxable income from active trade or business activities. If you have $8,000 of qualifying furniture but only $5,500 of active business income, §179 is capped at $5,500. The remaining $2,500 carries forward indefinitely — you never lose it permanently, but you plan around it. Accelerated depreciation strategies like bonus depreciation don't have this constraint, which is why investors with paper losses often favor bonus depreciation instead.
Step-by-step: how the deduction flows. Place qualifying property in service during the tax year — furniture, appliances, computers, or certain HVAC equipment (tangible personal property with a depreciable life of 20 years or less). Elect §179 on Form 4562. Apply the income limitation: your deduction is the lesser of cost or net active business income. Excess carries forward. The asset's adjusted basis drops by the amount expensed — remaining basis depreciates normally over its standard life. When you sell, the IRS recaptures the §179 amount as ordinary income under §1245 rules. See recapture for how that bill gets calculated.
Real-World Example
James bought a short-term rental cabin in Tennessee in early 2024 and furnished it before the first guest arrived: $4,200 in kitchen appliances, $6,800 in bedroom furnishings, $1,100 in smart locks, and $3,280 in patio furniture — $15,380 total in personal property qualifying under section-179.
His STR netted $18,700 in active business income that year, comfortably above $15,380. James elected the full §179 deduction on Form 4562 and wrote off all $15,380 in 2024 instead of depreciating it over five to seven years — saving roughly $3,845 in federal taxes at his 25% rate.
His CPA flagged the catch: if James sells the cabin, the IRS recaptures that $15,380 as ordinary income under recapture rules. The deduction is a timing benefit, not a permanent tax elimination.
Pros & Cons
- Converts multi-year depreciation schedules into an immediate deduction — improving cash flow in the year of purchase
- Unused deductions carry forward indefinitely, so the benefit is never permanently lost
- You elect it asset by asset, giving you precise control over how much to expense in any given year
- Applies to a broad range of personal property: appliances, furniture, computers, certain equipment, and some improvements
- Combines with bonus depreciation strategically — use §179 up to your income limit, then layer bonus depreciation for amounts that would create a loss
- The income limitation can neutralize the deduction in years when your rental income is low
- Does not apply to residential rental buildings or their structural components — only personal property
- Creates a recapture liability at ordinary income tax rates when you sell the asset — the write-off is temporary timing relief
- The 2024 phase-out at $2,890,000 of placed-in-service property limits its value for large operators buying equipment-heavy portfolios
- Requires a timely election on Form 4562 — missing the filing deadline forfeits the election for that year
Watch Out
- Passive activity rules don't mix with §179. The income limitation applies to active business income. If your rental is classified as a passive activity, §179 can't offset passive losses — confirm your CPA is using active income only in the calculation.
- Basis reduction triggers future recapture. Every dollar you expense reduces your adjusted basis by the same amount. When you sell, the IRS recaptures that gain as ordinary income — not the preferential capital gains rate. See recapture for how §1245 rules work.
- The de minimis safe harbor is often simpler for small items. If a single item costs $2,500 or less, the de-minimis-safe-harbor election is cleaner — no Form 4562, no income limitation, no recapture. Compare both approaches with your CPA before defaulting to §179.
- Don't confuse §179 with bonus depreciation. Bonus depreciation also provides first-year expensing but with no income limitation — it can create a loss that offsets other income. Bonus depreciation is phasing out through 2026 while §179 is permanent law. For most STR investors with solid income, §179 is sufficient and simpler.
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The Takeaway
The Section 179 deduction is the IRS-provided lever for writing off qualifying personal property in the year you buy it, not over years of depreciation. It's capped by your active business income, it requires a Form 4562 election, and any excess carries forward without expiration. For STR investors loading up a new property with furniture and appliances, it's often the fastest path to a meaningful year-one deduction — as long as the income limitation doesn't clip it. Pair it strategically with bonus depreciation and the de-minimis-safe-harbor election to build a first-year expensing approach that fits your actual income picture.