The short answer: compare what the machine costs you each month to keep (repairs, downtime, hire cover and knock-on costs, averaged over the last 12 months) with what it would cost each month to replace (the repayment and running costs, less any equity in the old machine). Then adjust for risk: is this a one-off or a pattern, how critical is the machine to booked work, and how long will the repair actually buy you? Repair when one fix on an otherwise sound machine restores reliability at a cost well below replacing it. Replace when the costs keep coming, the machine is critical, or the repair only buys time until the next failure.
Repair-or-replace calls are usually made under pressure, with a workshop quote in one hand and a job waiting. This guide gives you a way to make the call on the numbers instead.
Step 1: Put a number on keeping it
Add up the last 12 months. Most operators know the repair bills. The other lines are usually bigger.
| Cost | Where to find the number | What to watch |
|---|---|---|
| Repairs and parts | Workshop invoices | Rising trend; the same system failing again |
| Downtime | Days off the job × what the machine earns per day | Count lost revenue, not just the repair bill |
| Cover while it's down | Hire invoices; subcontractor costs | Short-notice hire in peak season can be scarce |
| Knock-on cost | Idle crew, late deliveries, penalties, lost clients | Hardest to measure, often the largest |
| Running cost | Fuel, tyres, wear items | Compare with manufacturer figures for the specific replacement, not general claims |
Divide by 12 for a monthly cost of keeping it. TMF's Downtime Cost Calculator helps put a figure on the downtime lines. The result is indicative.
Step 2: Put a number on replacing it
The repayment. Run the replacement's price through the Repayment Calculator with a realistic deposit, term and balloon.
What the old machine contributes. If it's worth more than you owe on it, that equity can reduce what you borrow. If you owe more than it's worth, the shortfall adds to the cost. Get a payout figure from your financier and a realistic value before you compare. If a balloon is involved, TMF's Loan Terms Explained covers how balloons and terms work.
Running costs for the replacement, from the manufacturer's figures for that specific model and configuration.
Changeover costs: transport, registration, fit-out, and any downtime during the swap.
Step 3: Adjust for risk
Two machines with the same monthly numbers can deserve different answers. Ask:
One-off or pattern? A first major failure on a sound machine is different from the third breakdown this year.
How critical is it? If it fails during booked peak work, what does that cost, and can it be covered?
What does the repair actually buy? Months of reliable work, or time until the next system goes? Is the repair covered by any warranty?
Parts and workshop time. Are parts readily available, or weeks away?
What happens if it fails again? Is hire available, at what cost, and for how long?
The decision table
| Situation | Usually points to |
|---|---|
| One significant fault, the rest of the machine sound, repair well below the cost of replacing, parts available | Repair |
| Repair is reasonable now, but costs are trending up and a balloon or end of term is approaching | Repair now, plan the replacement for a set date |
| Reliable on the evidence, and the work could be covered by hire if it failed | Run it, with cover lined up |
| Repair is slow (parts weeks away) and the work can be covered | Hire while you decide, then repair or replace calmly |
| Repeat failures, rising monthly cost, machine critical to booked work | Replace, with hire cover until the replacement is on the job |
An illustrative comparison
Round numbers to show the method. Not a real machine, deal or quote.
Keeping it: $28,000 of repairs in the last 12 months, plus 12 days off the job at $2,000 a day in lost earnings, plus $6,000 of hire cover. That's $58,000 a year, or about $4,800 a month, before counting the risk of a failure during booked summer work.
Replacing it: say the Repayment Calculator shows about $4,200 a month for the replacement being priced. The old machine has roughly $20,000 of equity (worth about $20,000 more than its payout figure), which can go in as a deposit and bring that figure down.
On those numbers, replacing costs less each month than keeping, and it removes the breakdown risk. If the repairs had been one-off and the downtime minimal, the answer could easily flip. That's why Step 3 matters.
When repair is the right call
The fault is isolated and the rest of the machine is in good condition
The repair cost is well below what replacing would cost over the same period
Parts are available and the repair can be done before the work needs it
You don't need a newer machine's capability for the work you have
Cash or equity would be stretched by replacing right now
When replacement is the right call
Costs are recurring rather than one-off
The machine is critical to booked work and failure would be expensive
The repair only buys time until the next major system goes
A replacement's monthly cost is close to, or below, the cost of keeping the old one
You have equity in the old machine, or a balloon or end of term is approaching anyway
Hire as an option, not just a cost
Hire can bridge a repair, buy time to decide, or be the right long-term answer for work you only need occasionally. If you're likely to hire for more than a short stretch, compare the hire cost with owning a replacement using TMF's Rental Replacement Calculator. Hire can still be the better choice for short-term or occasional work.
What the finance side changes
Equity in the old machine makes replacing more affordable now.
Negative equity doesn't rule replacement out, but you start the new loan behind. That can still be worth it when the old machine is costing more than the shortfall.
A balloon due soon is a natural decision point: pay it, refinance it, or sell or trade and replace. Decide a few months ahead.
An existing finance quote for a replacement can be sense-checked with the Rate Check Calculator.
Balloons and terms are explained in Managing Cashflow: How to Structure Business and Equipment Loans Around the Way Your Business Earns. If you'd like help working out the payout and equity numbers for your machine, Get Fast Answers.
If the machine is already down
Keep the work moving. Call your client early; line up hire, a subcontractor or a reshuffle of your own fleet.
Get a written repair quote with parts availability and a realistic time estimate.
Run Steps 1–3 above, even quickly. A rushed decision is still better made on numbers.
Don't skip the checks if you buy a replacement in a hurry: PPSR search, proof of ownership, an inspection. TMF's Machinery Buying Checklist and Private Sale Equipment Finance pages cover what to check.
How quickly finance can be arranged depends on the lender, the machine, the seller and how complete your information is. Nobody can promise a timeframe before seeing the deal. If a machine is down now, Talk to TMF or call 1300 863 346.
If you're still weighing it up, Get Fast Answers with your four numbers.
Frequently asked questions
How do I decide whether to repair or replace a truck or machine?
Compare the monthly cost of keeping it (12 months of repairs, downtime, hire cover and knock-on costs) with the monthly cost of replacing it (the repayment and running costs, less any equity in the old machine). Then adjust for risk: whether failures are a pattern, how critical the machine is to booked work, and how long the repair will buy.
Is there a rule of thumb for repair or replace on heavy equipment?
Rules of thumb exist, such as comparing a year's repairs with a share of the replacement cost. They are a prompt to look closer, not an answer, because they ignore downtime, hire, equity in the old machine and how critical the machine is. Run the actual numbers for your machine.
Does the finance still owing on my machine affect the decision?
Yes. If the machine is worth more than its payout figure, that equity can reduce what you borrow for a replacement. If you owe more than it's worth, the shortfall adds to the cost of replacing now. Get a payout figure and a realistic value before deciding.
Should I hire while I decide?
If a repair will take time or you're unsure, hire can keep the work moving while you decide on the numbers. For longer stretches, compare hire with owning using the Rental Replacement Calculator. Hire can be the better answer for short-term or occasional work.
How quickly can I replace a machine that's broken down?
It depends on whether a suitable machine is available, the checks it needs, the lender and how much of your information is ready. Having your financials, current finance details including the payout figure, and the replacement's details ready is the biggest thing you can do to speed it up.
Is a newer machine always cheaper to run?
Not always. It depends on the specific models, configuration, application and how they're operated and maintained. Use the manufacturer's figures for the exact replacement you're considering, and treat performance claims as dependent on conditions.
Related TMF reading and tools
The Cost of Delay: Why Ageing Equipment Can Quietly Drain Margin
Loan Terms Explained: What Operators Need to Know Before the Right Machine Appears
Downtime Cost Calculator · Repayment Calculator · Rental Replacement Calculator · Rate Check Calculator
About TMF: Transport & Machinery Finance (TMF) is an Australian equipment finance broker for trucks, trailers, machinery and other commercial equipment.
Important note: General information only. Not personal financial, tax or legal advice. No approval or timeframe is guaranteed. Finance approval, rates and terms depend on lender assessment, the machine and supporting documentation. Calculator results and the example above are indicative only.