How Truck Depreciation Hits One Doc Serviceability (2026)
Truck depreciation impact on One Doc home loan serviceability for owner-drivers – Switchboard Finance
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One Doc Home Loans · Multi-Vehicle Depreciation · Owner-Drivers
How Truck Depreciation Hits One Doc Serviceability
A two-truck owner-driver running a prime mover and trailer can easily claim $80,000 or more in annual depreciation under the ATO's effective life rules, and every dollar of it shrinks the net income a One Doc lender uses to assess your home loan. The good news: One Doc assessment doesn't rely on tax returns, so the add-back mechanism works differently to full-doc.
Quick Answer
Multi-vehicle depreciation reduces your taxable income but not your actual cashflow. One Doc lenders assess serviceability using your accountant's declaration of gross income or BAS turnover, not your tax return, so the depreciation deductions that crush full-doc applications have less impact on a One Doc assessment.
Why Depreciation Kills Full-Doc Serviceability
Depreciation is a non-cash deduction that reduces your taxable income without reducing your actual bank balance. Under the ATO's depreciation rules, a prime mover purchased for an illustrative figure of $350,000 might be depreciated at an effective life of 7.5 years, generating roughly $46,000 in annual depreciation deductions. Add a trailer at an illustrative $120,000 over 10 years ($12,000 per year, in line with the ATO statutory cap on truck trailers), and the combined annual depreciation on just one truck-and-trailer set is around $58,000.
Scale that across two or three vehicles, and you can easily claim $115,000 to $175,000 per year in depreciation schedule deductions, all of which drives your taxable income down and makes full-doc serviceability assessment almost impossible for a meaningful home loan amount.
Full-doc lenders use taxable income. They look at your tax return, see a net figure that's been slashed by depreciation, and calculate your borrowing capacity against that depleted number. For an owner-driver with $400,000 in gross revenue but $150,000 in depreciation deductions plus normal operating costs, the taxable income might sit at $60,000, which supports very little in home loan borrowing. This is where One Doc home loans change the equation.
How One Doc Lenders Treat Truck Depreciation
One Doc assessment bypasses tax returns entirely. Instead, the lender relies on your accountant's signed declaration of income, typically based on BAS turnover or gross trading revenue, with allowable deductions negotiated between the lender's credit team and your accountant's letter. The treatment of depreciation in this process is the critical difference.
The key insight: depreciation is added back because it's a non-cash expense. Your accountant certifies your income inclusive of depreciation add-backs, which means the lender sees a figure much closer to your actual operating cashflow than a tax return would show. However, the chattel mortgage repayments themselves still count as a liability, the lender subtracts your existing truck debt commitments from the income figure when calculating serviceability.
When Multi-Vehicle Depreciation Helps vs Hurts
The depreciation add-back mechanism isn't automatic. Your accountant's letter needs to explicitly address the depreciation treatment, and different lenders have different policies on what they'll accept. Here's where the assessment gets nuanced.
Stronger Fit
- Accountant's letter explicitly adds back depreciation
- Two trucks or fewer, lenders comfortable with this fleet size
- Chattel mortgage repayments are manageable against gross revenue
- BAS shows consistent quarterly turnover growth
- Each vehicle has a clear contract or booking attached
Gets Tricky
- Accountant's letter doesn't break out depreciation from other deductions
- Three or more vehicles, lender questions concentration risk
- Balloon payments maturing within 12 months of home loan application
- BAS turnover is declining despite fleet expansion
- Truck debt-to-income ratio exceeds lender comfort level
The practical tip: have your accountant prepare the One Doc letter with a separate depreciation line. If the letter just shows a net income figure without explaining what's been added back, the lender's credit assessor has no basis for the add-back and will default to the lower number. See how transport income gets assessed under One Doc for the full income assessment mechanism.
If you're running a multi-vehicle fleet and considering a home purchase, check your eligibility to see which One Doc lenders match your fleet profile, no credit check, no paperwork upfront.
Structuring the Application: Step by Step
The approval path for a One Doc home loan with multi-vehicle depreciation follows a specific sequence. Getting this order wrong, particularly the accountant's letter, is the most common reason truckie One Doc applications stall at credit.
List every vehicle, its finance type (chattel mortgage or lease), outstanding balance, monthly repayment, and any balloon payments maturing within 24 months. The lender needs a complete picture of your transport liabilities.
The letter must show gross income, itemise depreciation separately, and state the adjusted income after depreciation add-back. Generic letters that just declare "net income of $X" without explaining the add-back mechanism are the #1 reason for delays.
The lender will cross-reference your accountant's declared income against your BAS turnover figures. Any material gap between the two triggers additional questions. Consistency between the letter and the BAS is the fastest path through credit.
Different non-bank lenders have different fleet-size tolerances. Some cap at two financed vehicles, others are comfortable with five. Your broker matches your specific fleet position to the lender whose credit appetite fits, avoiding the wasted time of applying to a lender who'll decline on fleet concentration alone.
Include your depreciation schedule as a supporting document. This shows the lender the exact dollar amounts being added back and proves the add-back is grounded in the ATO's effective life rules, not inflated by your accountant.
The difference between a 3-week approval and a 3-month stall usually comes down to how the accountant's letter is structured. If you've been through a chattel mortgage vs lease decision before, you'll know the documentation detail matters. The same principle applies here, except the stakes are your home loan, not a truck facility.
The Rate Environment and Why Timing Matters
With the RBA cash rate at 4.10% following the March 2026 hike, and major bank economists forecasting a potential May hike to 4.35% at the 5 May meeting, serviceability buffers are tighter than they've been in years. Non-bank One Doc lenders typically apply a 2–3% buffer above the offered rate when testing serviceability. At current rate settings, that means your income needs to service the home loan at an illustrative assessment rate of 7% or higher.
For an owner-driver with two trucks generating combined depreciation of $100,000 per year, the difference between a full-doc assessment (which doesn't add back depreciation) and a One Doc assessment (which does) can be the difference between qualifying for a home loan of a few hundred thousand versus not qualifying at all. The depreciation add-back doesn't change the rate, it changes the income the lender uses to calculate your maximum borrowing capacity.
The truckie loan pack bundles your vehicle finance with home loan positioning, so the fleet structure and the home loan application work together rather than competing against each other. See also the truck debt and One Doc servicing guide for how existing repayments interact with home loan borrowing capacity.
Multi-vehicle depreciation is the largest non-cash deduction in most owner-driver tax returns, and the single biggest reason full-doc home loan applications fail for truckies. One Doc home loans solve this by using your accountant's declaration of income with depreciation added back, giving the lender a figure that reflects your actual operating cashflow rather than your artificially reduced taxable income. The key to approval is how your accountant structures the letter: depreciation must be itemised separately, supported by your depreciation schedule, and cross-referenced against your BAS turnover.
Key takeaway: The same depreciation that saves you tax is the reason full-doc lenders say no. One Doc flips the equation, but only if your accountant's letter is structured correctly from day one.Frequently Asked Questions
No, provided your accountant's letter correctly adds back the depreciation. One Doc home loan assessments use an accountant-declared income figure, not your tax return. Depreciation is a non-cash deduction, so your accountant can add it back to show the lender your actual operating cashflow. The lender still deducts your truck finance repayments as a liability, but the depreciation itself should not reduce your assessed income if the letter is structured properly. See the depreciation glossary entry for how the ATO defines this deduction.
There is no fixed cap, but lender appetite varies. Most non-bank One Doc lenders are comfortable with two to three financed vehicles where each has a contract or consistent booking history to support the repayments. Beyond three vehicles, some lenders apply a fleet concentration overlay, they want to see that the revenue isn't dependent on a single client or a single route. Your broker matches your fleet size to the lender whose credit appetite fits. The fleet chattel mortgage guide covers the multi-vehicle lending process in detail.
A balloon payment maturing within 12 months of your home loan application creates a contingent liability that most lenders will factor into their serviceability calculation. The lender needs to see your plan for that balloon, refinance, payout from cashflow, or trade-in, before they'll approve the home loan. The cleanest approach is to refinance the truck balloon before lodging the home loan application, removing the contingent liability entirely. If the balloon is more than 12 months away, most lenders treat the current monthly repayment as the relevant liability and ignore the future balloon.
Yes, but the add-back treatment is less straightforward. The instant asset write-off (currently $20,000 per asset until 30 June 2026, reverting to $1,000 from 1 July 2026 per the ATO) creates a large one-off deduction that appears in your financials as an abnormal expense. Your accountant can add this back in the One Doc letter as a non-recurring item, but some lenders will only partially accept the add-back if the write-off relates to a depreciating asset that generates ongoing costs. The key is documenting the write-off as a one-time event, not a recurring pattern. Check the low doc glossary entry for how lenders distinguish between standard and low-doc income verification.
Most non-bank One Doc lenders cap at 80% LVR for owner-occupied properties and 75% for investment properties. Some specialist lenders will consider up to 85% LVR for strong profiles, two or more years of ABN history, clean credit, consistent BAS turnover, and manageable fleet debt. The rate margin above 80% LVR is typically 0.5–1.0% higher, so most brokers recommend staying at or below 80% unless the extra borrowing capacity is essential. The One Doc for transport operators guide explains the full approval criteria.
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