Capex vs opex: making the spend decision
Decide between capex and opex on total lifetime cost and cash impact, never on the monthly payment alone. Buy core, durable assets you will use for more than five years when cash allows; lease whatever is short lived, uncertain or quick to go obsolete. In our example, a 120,000 euro machine comes to roughly 128,000 euros net as capex over 7 years versus 235,000 euros leased: the saving is real, but you pay for it in cash tied up from day one.
"I can buy the machine for 120,000 euros, or lease it for 2,800 euros a month. Which should I take?" I hear some version of this in almost every diagnostic call. And the answer owners get too often ("lease it, it keeps the balance sheet clean") is precisely the one that costs the most over time. Treating capex versus opex as an accounting nicety is the real mistake: you are deciding about cash, returns and, on the day you sell, the value of your business.
First, the terms. Capex (capital expenditure) is an investment: you buy a durable asset (a machine, a vehicle, purchased software, a fit out) that sits on the balance sheet and depreciates over several years. Opex (operating expense) is a running cost: rent, subscription, lease, maintenance, a service, all of which hit this year's profit and loss in full. The same function, having a machine, software or premises, can often be obtained either way. The whole game is knowing which one actually serves your business.
Why this choice matters more than it looks
The "all opex" reflex is tempting: no big upfront outlay, a smooth cost, a lighter balance sheet. But it shifts the problem rather than solving it. Opex protects your cash at the outset and keeps you flexible; capex captures the value of an asset you will use for a long time. To choose is to trade off three things that do not always point the same way: your available cash, the total cost over the asset's life, and the risk that it becomes obsolete or useless.
A classic mistake is to reason from the headline monthly payment rather than the full cost. Back to the machine. As capex: 120,000 euros out, depreciated over 7 years, around 17,000 euros of annual charge in profit and loss, plus maintenance. As opex: 2,800 euros a month over 7 years, 235,000 euros paid in total, almost double, but spread out and often including maintenance. Leasing is not "cheaper": it is more expensive in aggregate and lighter at the start. It is a trade, not a saving.
The four questions that decide it
Before you compare prices, run every decision through four questions. They settle most cases without any sophisticated math.
- How long will you genuinely use it? A core asset, stable and used for more than five years, leans towards capex. A short, uncertain or fast changing need leans towards opex.
- How fast does it go obsolete? Equipment that goes out of date in two or three years (cutting edge hardware, some software) is better leased or taken on subscription. A robust machine tool that lasts fifteen years should be bought.
- Where is your cash? When every euro counts to fund growth, preserving cash through opex can be worth more than the long term saving. When cash is solid, capex captures value.
- Is the asset strategic or peripheral? What sets you apart (specific expertise, a key tool) is often worth owning and controlling. The peripheral (a vehicle fleet, a standard IT estate) can be leased without a second thought.
The calculation that breaks the tie: total cost and discounted cash
When the four questions are not enough, lay out the total cost of ownership over the full life, on both sides. For capex: purchase price, plus installation, plus maintenance over the period, plus the cost of the money tied up, minus the residual resale value. For opex: the sum of leases or subscriptions over the same period, including contractual increases and whatever is bundled in (maintenance, updates, support).
Back to the machine over 7 years. Capex side: 120,000 euros to buy, 4,000 euros a year in maintenance (28,000 euros total), an estimated resale value of 20,000 euros at end of life. Net cost: 120,000 plus 28,000 minus 20,000 = 128,000 euros. Opex side: 235,000 euros, maintenance included. Buying is clearly cheaper in aggregate. But it ties up 120,000 euros of cash immediately. If that sum, reinvested in your business, earns you more than the cost gap, opex becomes defensible again. This is where discounting comes in: a euro today is worth more than a euro in five years.
The right question is not "which option keeps my balance sheet cleanest?" but "which option costs me the least in total, without weakening my cash when I will need it most?"
The disguised financing trap
Many long term rental or lease contracts are, economically, purchases bought on credit. You pay for the asset in installments, interest included, and sometimes end up owning it for a token amount. Dressed up as opex, it is really capex on credit, often at a rate higher than your bank would charge. Before you sign, work out the implied rate: compare the sum of the payments with the cash purchase price. If the gap matches an 8 or 10% rate, you are borrowing dearly without knowing it.
This connects directly to your debt capacity. Long term lease commitments are debt, even when a quick read does not show them as such. I have watched owners discover in due diligence that the buyer added every future lease payment back into net debt, then adjusted the price accordingly. A bank runs the same restatement before granting a loan. So stacking up opex contracts to "keep a clean balance sheet" fools no one who knows what to look for, and it eats into your future room to maneuver.
The effect on your accounts and ratios
The capex or opex choice distorts your indicators, which can mislead you if you are not careful. Capex flows through depreciation, so below the EBITDA line: it flatters your EBITDA but loads up your debt and balance sheet. Opex hits EBITDA directly: it lowers it but keeps the balance sheet light. Comparing two companies, or two years, without neutralizing this choice leads to false conclusions.
- On profit: capex smooths the cost over several years, opex concentrates it in the period.
- On cash: capex goes out at once, opex spreads.
- On EBITDA: capex preserves it, opex reduces it.
- On debt: leases and long term rentals add to real net debt, even when off the visible balance sheet.
- On tax: opex is deductible immediately, capex only through depreciation over time. Compare for your own situation.
A simple framework to apply from tomorrow
For every meaningful spend, run the same sequence. Estimate the real useful life and the speed of obsolescence. Work out the total cost on both sides over that life. Check the impact on your available cash for the next twelve months. Hunt down the implied rate of any rental formula before you label it opex. Then decide, on full cost and cash, never on the monthly payment alone or on the look of the balance sheet. Honestly, twenty minutes is usually enough.
One closing rule of thumb: match the nature of the spend to the nature of the need. A core, durable and strategic asset, funded when cash allows, is worth owning. A short, uncertain need, or one bound for quick obsolescence, should be leased. And never fund a permanent need with a string of expensive short contracts.
Getting the call right comes down to figures specific to your business: your true useful life, the cost of your cash, your debt ratios. That is exactly the kind of trade off a fractional CFO works through with you, and the one we tackle in a diagnostic call. In one conversation we cost out both scenarios, measure the effect on your cash, and tell you which option strengthens your business rather than weighing it down.
Buy or lease: compare cash flows over the same period
Show deposits, rentals, maintenance, insurance and any resale proceeds over a consistent horizon. Check exit terms, availability and interruption costs. A small monthly payment may defer costs without reducing total cost. Accounting treatment depends on the contract and requires confirmation.
Base the decision on operating needs, available cash and volume scenarios. Expected tax savings alone should not justify the equipment.
Key points
- Leasing is almost never cheaper in aggregate: it trades a higher total cost for cash preserved at the start.
- Four questions settle most cases: real useful life, speed of obsolescence, state of your cash, and whether the asset is strategic.
- Always compare the total cost of ownership of both scenarios over the asset’s life, maintenance and resale value included.
- A lease is often a disguised purchase on credit: work out the implied rate before signing, it sometimes reaches 8 to 10%.
- Banks, investors and buyers add long term leases back into debt: opex makes the balance sheet quieter, not stronger.
Frequently asked questions
Does leasing really keep my balance sheet clean?
Only on the surface. Any serious reader, whether a bank, an investor or a buyer, adds your future lease payments together and treats them as debt. You gain discretion, not strength. A legible balance sheet with honest debt beats a light one stuffed with commitments hidden off the balance sheet.
How do I spot a lease that is really a loan in disguise?
Add up every payment in the contract, final purchase option included, and compare the total with the cash price. The gap implies an interest rate. If it exceeds what your bank would lend at, negotiate or finance the purchase another way. A token buyout at the end of the contract is another strong tell.
Is subscription software capex or opex?
A standard SaaS subscription is opex: you pay for a cancellable right to use, with no asset on the balance sheet. A purchased perpetual license, or custom development you own, can be capitalized. The test stays the same: useful life, ownership and residual value.
How do these choices affect the price when I sell my business?
A buyer normalizes your EBITDA, adds long term leases back into net debt and estimates the maintenance capex needed after the deal. An underinvested asset base or a stack of expensive rental contracts translates directly into a discount. Documented, consistent choices hold up in negotiation.
Can your business afford this investment?
Examine the full cost, payment timing and a cautious scenario before committing.
Plan my investment