You need the machine — the delivery van, the CNC mill, the server rack, the commercial oven. The salesperson has already told you leasing is "only $489 a month" while buying outright costs $28,000, and those two numbers refuse to sit side by side in your head. That confusion is expensive: pick wrong and you either drain cash you needed for payroll or pay a premium for flexibility you never use. The fix is not a rule of thumb about leases being good or bad. It is a short, repeatable analysis that puts both options in the same currency — after-tax dollars, in today's money — and lets the cheaper one win.
Why Monthly Payment vs. Sticker Price Lies to You
Comparing a lease payment to a purchase price is comparing a slice to the whole pie. The purchase price is a one-time cash outflow that buys you an asset with a resale value, a stream of tax deductions, and years of maintenance bills. The lease payment is a stream of smaller outflows that buys you use of the asset, a different stream of tax deductions, and usually a walk-away option at the end. Three things make them genuinely hard to compare by instinct:
First, taxes change both prices. Lease payments are generally deductible as ordinary business expenses in the year you pay them. A purchase gives you depreciation deductions — often accelerated up front through Section 179 expensing or bonus depreciation — plus deductions for interest if you finance. The option with the bigger, earlier deductions effectively costs less, and the only honest comparison happens after tax.
Second, a dollar today is not a dollar in year five. Buying concentrates cash outflow now; leasing spreads it out. Money you do not spend today can sit in the business earning a return or covering the next emergency. Any comparison that adds up five years of lease payments and stacks the total against the purchase price ignores the time value of money.
Third, ownership leaves you holding something. At the end of the horizon the buyer owns a used asset worth its residual (salvage) value; the lessee typically owns nothing, or owns the right to buy the asset at a predetermined price. Forgetting the residual value punishes buying unfairly — though, as we will see, overestimating it is the classic way buyers fool themselves.
The professional solution to all three problems is one calculation: discount each option's after-tax cash flows to present value and compare. Accountants call the difference the net advantage to leasing (NAL). Positive means lease; negative means buy. Everything below is how to build that comparison without a finance degree.
Step 1: Frame the Decision Before You Touch a Spreadsheet
A lease-vs.-buy analysis answers a narrow question: given that you need this equipment for N years, what is the cheapest way to have it? Nail down the inputs first:
- The horizon. How long will you actually use the equipment? Not its physical life — your realistic holding period. A delivery van that runs for 12 years but that you will replace in five has a five-year horizon. If the lease term and your horizon differ, you must price the gap years (a second lease, a buyout, a replacement purchase) on the lease side.
- The discount rate. For a small business, the standard choice is your after-tax cost of borrowing: your loan interest rate times one minus your marginal tax rate. If your bank charges 9 percent and your combined marginal rate is 25 percent, your discount rate is 9 percent times 0.75, or 6.75 percent. This is the rate the textbooks recommend for lease analysis because leasing and borrowing are substitute ways of financing the same asset. No debt? Use the return your cash earns sitting in the business — the opportunity cost of tying it up in equipment.
- Your marginal tax rate. Federal plus state, on the next dollar of deduction. A profitable S corporation owner in a mid-tax state might land near 30 percent; a C corporation starts at 21 percent federal plus state. If the business is losing money and cannot use deductions this year, the tax shields are worth less — or must be carried forward — which changes the answer.
- Maintenance responsibility. Who pays for service, repairs, and consumables under each option? Full-service leases bundle maintenance; a purchase leaves it all on you. Get the number, do not guess it: ask the dealer for the service contract price and add it to the buy side.
Write these four down. Half of all bad lease-vs.-buy decisions come from analyzing the wrong horizon or the wrong tax rate, not from bad math.
Step 2: Build the Buy Side, Line by Line
Buying means a large outflow now, deductions and maintenance costs along the way, and a residual value at the end. Lay the cash flows out year by year:
Year 0: the purchase price (minus any down payment timing). If you pay cash, the full price leaves your account today. If you finance, be careful: the correct buy-side cash flows are the loan payments (after tax on the interest portion), not the sticker price — or equivalently the full price now minus the loan proceeds. Either presentation works as long as you do not count both the price and the payments. Many textbook analyses assume a cash purchase to keep the comparison clean, then note that financing changes timing but rarely changes the verdict.
Years 1–N: maintenance, insurance, and operating costs, entered after tax. A $2,000 annual service contract at a 25 percent tax rate costs you $1,500 in after-tax cash, because the $2,000 is deductible. Multiply every deductible outflow by one minus your tax rate.
Years 1–N: the depreciation tax shield. This is where buying usually shines. Under current law, most new and used equipment with a recovery period of 20 years or less qualifies for 100 percent bonus depreciation — permanent for property acquired and placed in service after January 19, 2025 — meaning you can deduct the entire cost in year one. Alternatively, Section 179 lets businesses expense up to $2,560,000 of equipment placed in service in 2026, phasing out dollar for dollar above $4,090,000 of total purchases. Either way, a $28,000 machine can generate a $28,000 deduction in year one, worth $7,000 of real cash at a 25 percent rate. Note the limits: Section 179 cannot create a loss (it is capped at taxable income) and requires business use above 50 percent, while bonus depreciation has no income cap. A true lessee gets neither — depreciation belongs to the owner — which is exactly what you are giving up when you lease.
Year N: the after-tax residual value. If you expect to sell the machine for $6,000 after five years, that is a cash inflow — but it is taxable to the extent it exceeds your depreciated book value. If you fully expensed the machine under Section 179 or bonus depreciation, your book value is zero and the whole $6,000 is taxable gain (recaptured as ordinary income up to the depreciation taken). At 25 percent, you keep $4,500. Be conservative here: owners systematically overestimate resale values, and technology equipment depreciates faster than the brochure admits. When in doubt, run the analysis twice — once with your honest residual estimate and once with zero — and see whether the verdict survives.
Discount every year's net after-tax cash flow back to today at your discount rate and add them up. That sum is the present-value cost of buying.
Step 3: Build the Lease Side the Same Way
Leasing means no big outflow now, steady payments along the way, and usually nothing at the end. The same discipline applies:
Years 1–N: lease payments after tax. A $489 monthly payment is $5,868 a year; at a 25 percent tax rate the after-tax cost is $4,401 a year, because each payment is deductible as an ordinary business expense. Include every required payment — monthly rent, any upfront capitalized-cost reduction, mandatory fees — and note whether payments are due at the beginning of each period (annuity due, the common lease structure) or the end, since beginning-of-period payments have a slightly higher present value.
What you do not get: depreciation deductions, the Section 179 or bonus write-off, and the residual value. The lessor owns the asset and claims all of those. Your lease quote bakes them in indirectly — the lessor priced the residual value and its own tax benefits into your payment — but you cannot count them as your cash flows.
Year N: end-of-term position. Read the lease. A closed-end (walk-away) lease ends: you return the equipment, pay any excess-wear or over-mileage charges, and own nothing. An open-end or bargain-purchase lease lets you buy the asset for a stated residual or a nominal sum; if you will exercise that option, the buyout price is a year-N outflow and the asset's remaining value is your inflow. A $1-buyout lease is economically a financed purchase wearing a lease costume — the IRS and your accountant will treat it as one, so analyze it on the buy side.
Bundled services. If the lease includes maintenance, insurance, or software, either subtract the standalone value of those services from the lease payments or add their cost to the buy side. Comparing a full-service lease payment against a bare purchase price without adjusting for maintenance is the single most common error in amateur analyses, and it always flatters leasing.
Discount the lease-side after-tax flows at the same rate. That sum is the present-value cost of leasing.
Step 4: Let the Net Advantage to Leasing Decide
Subtract: NAL = present-value cost of buying − present-value cost of leasing, where both are expressed as positive costs. Equivalently, compute each side as a negative net present value of cash flows and take NAL = NPV(lease) − NPV(buy). A positive NAL means leasing is cheaper in today's after-tax dollars; a negative NAL means buying wins.
A concrete example ties it together. Suppose you need a $28,000 packaging machine for five years. Your marginal tax rate is 25 percent and your after-tax borrowing rate is 6.75 percent.
Buy side. You pay $28,000 now. You expense the full amount under bonus depreciation in year one, saving $7,000 in tax — an after-tax year-one inflow of $7,000. Annual maintenance runs $1,500 before tax, or $1,125 after tax, in years 1–5. You expect to sell the machine for $5,000 in year five; with zero book value the gain is fully taxable, so the after-tax inflow is $3,750. Discounting at 6.75 percent, the maintenance stream costs about $4,650 in present value, the year-one tax shield is worth about $6,557, and the residual inflow is worth about $2,707. Present-value cost of buying: roughly $21,386.
Lease side. The lessor quotes $520 a month for 60 months — $6,240 a year, or $4,680 after tax — with maintenance included and walk-away return at the end. The present value of five annual payments of $4,680 at 6.75 percent is about $19,347.
NAL = $21,386 − $19,347 = $2,039 in favor of leasing. The lease wins, but only just — and notice how much work the bundled maintenance and the walk-away option did. Strip those out, or assume a higher residual, and buying takes the lead. That sensitivity is the real output of the analysis: not just the verdict, but which assumptions it depends on.
Run the numbers yourself with your actual quote, your actual tax rate, and your actual horizon. A spreadsheet with one row per year and two columns — buy-side after-tax flow, lease-side after-tax flow — plus a present-value row is the entire model. If the NAL is small relative to the equipment cost (a few percent either way), treat the decision as a toss-up on price and decide on the non-price factors below.
What the Spreadsheet Cannot Price
The NAL captures cash and taxes. It does not capture risk, and risk is often the whole ballgame.
Obsolescence risk is the strongest reason to lease. If the equipment will be outdated in three years — point-of-sale hardware, computers, diagnostic devices, anything with a fast model cycle — a lease transfers the residual-value gamble to the lessor. The buyer of tech equipment routinely discovers that the $5,000 residual in the spreadsheet is $500 on the used market. When obsolescence is rapid and unpredictable, a walk-away lease is insurance disguised as financing, and the premium is worth it. When the asset is a steel workbench that will outlive you, the insurance has no value and buying dominates.
Flexibility cuts both ways. Leasing lets you scale up, down, or sideways at term end — add workstations as you hire, swap the van for a truck, exit a location without an asset to sell. But leases also lock you in: early-termination penalties on equipment leases are often brutal, effectively the remaining payments in full. Read the termination clause before you sign, and discount any "flexibility" story that only works if you stay the full term.
Cash preservation matters most when cash is scarcest. A startup choosing between a $28,000 machine and a $520 monthly payment is not really choosing between two costs — it is choosing whether to keep $28,000 of runway. Even when buying wins on present value, a young business may rationally lease to protect liquidity, fund inventory, or preserve its bank line for emergencies. Name that trade explicitly: you are paying a known premium (the negative NAL) for a known amount of preserved cash.
Mind the accounting and the covenants. Since ASC 842, most leases live on the balance sheet as right-of-use assets with matching liabilities, so the old "off-balance-sheet" leasing advantage is largely gone for reporting purposes. Lenders know this. What remains is simpler: some loan covenants restrict additional debt but treat operating leases more leniently, and some businesses prefer the smooth lease-expense line to the lumpy depreciation-plus-interest pattern of a purchase. Ask your lender how each structure affects your ratios before you assume.
Maintenance quality is a hidden term. A full-service lease is only as good as the service. A 48-hour guaranteed repair window on your only production machine can be worth more than the entire NAL. Conversely, if you have in-house maintenance capability, you are paying the lessor's markup for a service you could perform at cost — price that into the buy side as a lower maintenance number rather than ignoring it.
Booking It Right: The Bookkeeping Angle
Whichever side wins, the bookkeeping must match the economics, because this is exactly the kind of transaction that gets mis-categorized and corrupts your reports for years. Lease payments are operating expenses in the period paid — never an asset, never loan principal. A purchase is an asset first (capitalized on the balance sheet) that becomes expense gradually through depreciation. Mixing the two up overstates assets, misstates profit, and produces a tax return your accountant has to unwind by hand.
If you keep your books in plain text, the two paths look like this:
2026-10-16 * "Acme Packaging" "Model P-500 packaging machine"
Assets:Equipment:Packaging-Machine 28000.00 USD
Assets:Checking -28000.00 USD
2026-12-31 * "Year-end depreciation" "Packaging machine, year 1"
Expenses:Depreciation:Equipment 5600.00 USD
Assets:Equipment:Packaging-Machine -5600.00 USD
2026-11-01 * "Lessor Corp" "Packaging machine lease, November"
Expenses:Rent:Equipment-Lease 520.00 USD
Assets:Checking -520.00 USDThe purchase creates an asset and expenses it over time; the lease payment hits expenses immediately. For a visual check that the balances behave, Fava's balance-sheet view shows the equipment asset declining as depreciation posts — if the asset never declines, your depreciation entries are missing. And if you want the full mechanics of depreciation methods and timing, the technical documentation walks through them step by step.
Five Mistakes That Flip the Answer
First, comparing pre-tax numbers. The buy side's upfront deduction and the lease side's spread-out deductions have different present values; ignoring tax routinely overstates the cost of buying by 20 percent or more.
Second, forgetting the residual value — or fantasizing about it. Zero is a legitimate conservative assumption for tech equipment; the dealer's optimistic trade-in quote is not evidence. Get a used-market price for the same model three to five years old and haircut it.
Third, mismatched horizons. A three-year lease quote against a seven-year ownership plan is not a comparison until you price years four through seven on the lease side. Always extend the shorter option to the longer horizon with explicit, realistic assumptions.
Fourth, ignoring the end-of-lease charges. Excess wear, restoration costs, over-mileage penalties, and automatic-renewal clauses with 90-day notice windows are where lease economics go to die. Total them from the contract and add them to year N of the lease side.
Fifth, letting the salesperson choose the discount rate. A low discount rate favors buying (future residual and distant costs matter more); a high rate favors leasing (deferred payments matter less). Your rate is your after-tax borrowing cost, not zero and not the lessor's implied 14 percent. Sensitivity-test the verdict a point or two in each direction.
Your Last Useful Step: The One-Page Decision Sheet
You now have everything the analysis requires. Before you sign or swipe, put one page together: your horizon and why, your tax rate and discount rate, the buy-side flows (price, maintenance, tax shield, after-tax residual), the lease-side flows (all-in payments after tax, end-of-term position, bundled services adjusted), and the resulting NAL. Then write down the two non-price factors that matter most for this asset — obsolescence risk, cash preservation, flexibility, maintenance — and which side each favors. If the NAL and the risk factors agree, decide in minutes. If they disagree, you have found the real question: how much are you willing to pay for the insurance the lease provides? Answer that number explicitly, and whatever you choose, your books — and your banker — will show a decision that was made on purpose.
