The Finance Algorithm
§ Tool · tier 1 · independent

Chattel Mortgage Calculator.

Calculate business vehicle finance with chattel mortgage and tax benefits

CalculatorFree, no signupOn-deviceupd August 2026
Inputs
Your numbers
$
$55k
$
$5k
%
7%
5
%
30%
%
80%

Percentage used for business purposes

%
25%

Company tax rate or your marginal rate

Math updates live as you change inputs · AI runs on submit

Awaiting inputs

Move the sliders or type in the form on the left — the math updates live as you go. Click Get AI verdict when you want a written analysis.

Chattel mortgage is a popular business vehicle finance option. You own the car from day one, claim GST credits immediately, and deduct interest and depreciation. This calculator shows the after-tax cost.

§ Worked examples

Real-world scenarios

Ute for Tradesman

$55,000 ute (inc GST), 5 years at 7%, 80% business use, 25% company tax rate.

Inputs

price:55,000rate:7term:5businessUse:80taxRate:25

GST credit: $4,000. Annual depreciation deduction: ~$10,000/year (diminishing-value method on the $50,000 ex-GST business-use cost) — vehicles priced over the $20,000 instant asset write-off threshold go into the general small business pool rather than being written off upfront. Monthly repayment: $990. After-tax effective cost significantly reduced.

§ FAQ

Questions Australians ask

§ Glossary

Plain-English definitions

Chattel Mortgage
A business loan where the vehicle is security (chattel) but you own it from the start.
GST Credit
Businesses can claim back the GST component of the vehicle purchase (business portion).
Instant Asset Write-Off
Immediate tax deduction for eligible business assets costing under $20,000 (the small business threshold made permanent from FY2026-27). Pricier assets, including most vehicles, are depreciated through the general small business pool instead.
Logbook Method
Keeping detailed records to prove business vs private use for tax purposes.