100% Bonus Depreciation Is Permanent Again in 2026 — But the Deduction Lives or Dies on Your Records

If you’ve been holding off on buying business equipment or a work vehicle, the tax math just tilted in your favor — permanently. The One Big Beautiful Bill Act permanently restored 100% bonus depreciation for most qualifying business property acquired and placed in service after January 19, 2025. That means the full cost of eligible equipment can be deducted in the year you put it to work, instead of spread out over years.

It’s a big deal for small businesses. It’s also a deduction that quietly depends on paperwork most owners don’t keep well — which is where a lot of the benefit leaks away.

What Changed

Before OBBBA, bonus depreciation was on its way out. The Tax Cuts and Jobs Act had scheduled a phasedown — down to 40% for property placed in service in 2025, and zero by 2027. OBBBA reversed that and made 100% first-year bonus depreciation permanent for qualified property (generally tangible property with a class life of 20 years or less) acquired and placed in service after January 19, 2025.

A few practical points:

• No annual dollar cap. Unlike Section 179 — whose maximum deduction rose to $2.5 million under the new law — bonus depreciation has no annual dollar limit on the deduction.
• You can opt out. You’re not required to take the full 100% now; a business can elect to claim 40% instead, or opt out entirely, when that suits its tax planning.
• Timing is everything. The trigger is when the asset is placed in service — actually ready and available for business use — not just purchased. That date is what unlocks the deduction.

Bonus Depreciation vs. Section 179 — Quickly

People mix these up. Both let you front-load the write-off of business assets, but Section 179 has an annual dollar cap and can’t push your business into a loss, while bonus depreciation has no dollar cap and is more flexible. Many businesses use Section 179 first and bonus depreciation on the remainder. You don’t have to master the interplay yourself — but you do have to hand your tax pro clean records for every asset, because both deductions rise or fall on the same documentation.

The Catch: Vehicles and Mixed-Use Property

Where this gets record-intensive is vehicles and anything used partly for personal reasons. The deduction is based on the business-use percentage. A truck used 80% for business gets 80% of the treatment — and the only way to prove that 80% is a mileage log showing business versus personal use. Heavier vehicles used more than half for business generally get more favorable treatment than passenger cars, which face separate luxury-auto limits. In every case, the numbers you can claim are the numbers you can document.

That’s the theme running under this entire law change: the write-off is generous, but it’s only as good as your records of the purchase date, the in-service date, the cost, and the business-use share.

What to Track for Every Business Asset

To claim bonus depreciation cleanly, keep this for each qualifying purchase:

• What it is — a description of the asset
• Purchase date and date placed in service — the second one drives the deduction
• Cost/basis — what you paid, including setup where applicable
• Business-use percentage — backed by a usage or mileage log for vehicles and mixed-use items

Miss any of these and you either can’t substantiate the deduction or you leave part of it unclaimed.

Keep the Records That Unlock the Write-Off

The businesses that capture the full 100% write-off aren’t the ones with the fanciest accountants — they’re the ones who wrote down the purchase and the business use when it happened. Our Small Business Tax Deduction Tracker is built to hold exactly those records: an Expense Log where equipment and asset purchases get a date, a cost, and a category the moment they happen, plus a dedicated Mileage Log at the 2026 rate of 72.5 cents per mile to substantiate the business-use percentage on vehicles. A Home Office tab, a Quarterly Taxes tab, and a Dashboard round it out, so your big asset purchases sit in the same place as the rest of your deductions.

It works in both Excel and Google Sheets, so when your accountant asks “when did you place that in service, and how much is business use?” the answer is already recorded — not reconstructed.

Permanent 100% bonus depreciation is one of the strongest incentives in the tax code for a small business to invest in itself. Claiming all of it comes down to the least glamorous part of the process: keeping the dates, costs, and usage records that turn a purchase into a full first-year deduction.

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Small Business Tax Deduction Tracker Spreadsheet — Log equipment and vehicle purchases with dates, costs, and business-use percentages so you can substantiate bonus depreciation and every other write-off. Seven tabs: Dashboard, Expense Log with pre-built deductible categories, Mileage Log at the 2026 IRS rate, Home Office calculator, Quarterly Taxes tracker, Categories, and Instructions. Compatible with Microsoft Excel and Google Sheets. $17.99 (currently $10.79 with the LAUNCH40 sale). Instant digital download.