What it means
Businesses are normally allowed to deduct the cost of equipment over its useful life, which reduces the tax they pay. For ordinary machinery this works as intended.
For passenger cars, the authorities worried that owners were buying costly vehicles for personal enjoyment and passing most of the cost on to the taxpayer through deductions. The solution was a set of annual dollar ceilings on the depreciation that can be claimed for cars used in business.
In the United States these are often called the luxury auto limits, and the figures are adjusted by the tax authority from time to time. If a vehicle costs more than the point at which the cap bites, the unclaimed part of the cost is recovered over a longer period.
Several details change the outcome. The deduction is reduced by the share of use that is personal, so a car used 80% for business only supports 80% of the allowed deduction.
Heavier vehicles above a certain weight threshold are often treated differently, and some are not subject to the passenger car caps, although other limits may apply. For a finance manager, the limits matter in vehicle purchase decisions and in pricing employee benefits.
A company car that looks attractive after an assumed full write-off may be far less appealing once the caps are applied. They also affect whether leasing, which has its own related rules, is cheaper than buying.
Records are essential. Authorities expect a mileage log or equivalent proof showing the business share of use, and without it deductions can be disallowed.
It is also worth confirming the current limits and the rules for your own country before relying on any example. Finally, the limits do not stop the full cost being recovered eventually.
They slow the timing of the deduction, which affects cash flow and the present value of the tax saving.
In practice
Real-world examples.
Example
A consulting firm buys a $110,000 executive car and plans to deduct the full cost immediately. Its accountant explains the annual caps, so the firm budgets for a slower write-off and a smaller tax saving in the first year.
Example
A real estate agent uses her $75,000 sedan 60% for clients and 40% privately. She keeps a mileage log, claims only 60% of the allowed depreciation and avoids problems if the tax authority asks for evidence.
Example
A delivery start-up compares buying a heavy van, which may fall outside the passenger car caps, with buying a luxury saloon for its founders. The finance lead finds the van gives a faster deduction and lower running costs, so the company chooses the van.
Formula
Calculation
Allowed depreciation = Lesser of (Cost x Depreciation rate) and Annual cap, then x Business use percentage
A company buys a car for $90,000 and uses it 80% for business. The standard first-year rate for the asset class is 20%, which would give 90,000 x 0.20 = $18,000. Assume, purely for illustration, that the annual cap for the first year is $12,000. The lesser figure is $12,000. Allowed deduction = 12,000 x 0.80 = $9,600. The $6,000 of depreciation that exceeded the cap is not lost but is recovered in later years.Case study
Seen in the real world.
Summit Peak Advisory is an illustrative, fictional firm whose founder wanted a $130,000 electric saloon for client visits. He assumed the whole cost could be deducted in the first year and had already built that tax saving into the budget. The company accountant explained that the cap would limit the first-year depreciation deduction to a fraction of that amount.
She modelled two cases. Under the cap, the tax saving arrived over about six years, while a cheaper $60,000 car would have been deducted much more quickly. The fictional founder still bought the saloon, but he reduced the budgeted first-year tax saving and agreed to log business mileage carefully.
The accountant added one more point for the board. Because the cap defers rather than removes the deduction, the present value of the tax saving was lower but not zero, and a lease with a smaller annual cost was worth comparing before the order was placed.
Watch out
Common mistakes.
- Assuming the full price of an expensive car can be deducted in the year of purchase, when annual caps may limit the deduction.
- Ignoring personal use, which reduces the deductible share and can lead to disallowed claims.
- Relying on last year's cap figures, when the tax authority adjusts the amounts from time to time.
Questions
People also ask.
Do the limits apply to all vehicles?
Not always, because heavier vehicles above a weight threshold may be treated differently, so check the specific rules for your vehicle type before you place the order, since the choice of vehicle can change the tax result by thousands of dollars.
Is the excess depreciation lost?
No, the unclaimed part is generally recovered in later years, so the limits mainly delay the deduction, which reduces the present value of the tax saving without removing it altogether.
How do I prove business use?
Keep a contemporaneous mileage log or equivalent records showing dates, purposes and distances, since claims without evidence are easily challenged.
From the founder's library
Take it further with the book.
Build your financial confidence beyond this definition. Shihan's full-length guide, Accounting Fundamentals, takes the same plain-English approach and turns it into a complete, practical playbook for non-finance managers, business owners and students - with chapter-end quiz answers and presentation slides included.
25% off with code MMHQ25, applied at checkout. Priced in USD - checkout may show the equivalent in your local currency.
View the book and save 25%Related