Net Advantage to Leasing: NAL Example

By Ryan O'Connell, CFA, FRM Published November 6, 2026

A lease can reduce the cash needed today while costing more over the life of the agreement. Buying can create depreciation tax benefits and resale proceeds while leaving the business responsible for maintenance and asset-value risk. Net advantage to leasing brings those differences into one present-value comparison.

The useful question is specific: what is the less expensive way to obtain the same required asset service over the same period? This guide builds a hypothetical four-year equipment example, checks the answer using two calculation methods, and finds the annual rent at which the decision changes. U.S. tax guidance provides the background; the example’s tax rate and depreciation schedule are stipulated teaching assumptions.

What Is Net Advantage to Leasing?

Net advantage to leasing (NAL) is the present-value benefit of choosing a lease instead of a specified ownership alternative. The comparison includes the cash costs and tax consequences that differ between those alternatives. Institutional lease-buy analysis uses present costs to put these different payment streams on a common basis.^[1]

Start by matching capacity, quality, reliability and the service horizon. If leasing includes maintenance, the ownership alternative needs comparable maintenance. If one alternative produces more usable output, include that additional benefit rather than treating the choice as a cost-only comparison.

NAL also differs from the decision to acquire the service at all. A positive NAL says leasing is better than the specified buying strategy; it does not prove that either strategy generates enough business benefits to justify proceeding. That broader decision belongs in capital budgeting and free cash flow analysis.

The Net Advantage to Leasing Formula

In a lease, the lessor is the asset provider and the lessee is the business obtaining its use. In the basic setup below, the lessor is the tax owner, so the lessee gives up ownership deductions and resale proceeds in exchange for avoiding the purchase and some ownership expenses.

A tax shield is the reduction in cash taxes attributable to a deduction. If an eligible $1 deduction immediately reduces taxable income facing a marginal rate T, its cash-tax benefit is T dollars. Accordingly, a fully deductible rent payment L costs L × (1 − T) after tax when the payment and usable tax benefit occur together. A depreciation deduction D creates a benefit D × T under the same usability assumption.

These are conditional cash-flow relationships. A deduction that cannot reduce taxes until a later year belongs at that later cash-benefit date. A financial-statement expense is not sufficient evidence of an immediately usable tax deduction.

The ownership benefits are subtracted because NAL measures the effect of switching from buying to leasing. Depreciation itself is not a second cash purchase cost: only its tax consequence enters here. The time value of money determines how much each future difference is worth today.

Which Discount Rate Should NAL Use?

A conventional financing comparison discounts debt-like lease-buy differences at an after-tax borrowing rate. ACCA illustrates this approach for a financing choice after an asset-replacement decision.^[2] The convention requires more than the observation that a cash flow occurs after tax.

In the example below, assume the lease obligations substitute for ordinary borrowing with comparable term, security and credit risk. Fixed payments and the specified, fully usable tax shields are treated as debt-like. The conventional rate captures the financing comparison, with no additional financing advantage, constraint or transaction cost. These assumptions permit a hypothetical 8% × (1 − 25%) = 6% rate for those components.

An uncertain equipment resale price has a different source of risk. We separately assume a 10% nominal rate appropriate to the expected after-tax resale proceeds, rather than applying 6% to that component. Both rates are teaching inputs, not market estimates. Valuation principles require rates suited to the cash flows being valued, including different rates for components with different risks.^[8]

For an actual decision, justify the residual valuation using relevant asset-market risk and defensible resale estimates. A certainty-equivalent approach is another possibility; avoid applying both a risk haircut and a risk premium for the same uncertainty. A generic company WACC is not automatically appropriate for either the contractual financing differences or the asset’s resale proceeds.

A Four-Year After-Tax Lease-vs-Buy Example

Suppose a hypothetical business needs a packaging machine for exactly four years. Buying and leasing provide identical output, quality, uptime and other operating benefits. An installed machine costs $100,000 today. Alternatively, a noncancelable lease charges $28,000 at the end of each year for four years and includes maintenance. Buying requires a separate fixed maintenance contract costing $4,000 at each year-end for equivalent coverage.

The business returns a leased machine at the end of year 4. If it buys, it sells the machine at that same date for expected gross proceeds of $20,000. The lease has no purchase or renewal option, residual guarantee, deposit, initial fee or return charge in this example. All other operating costs, taxes and working-capital requirements are identical and cancel.

The four-year equal depreciation schedule is invented for this model. It is not a claim that an actual U.S. machine qualifies for that tax life or deduction pattern. Real depreciation depends on tax ownership and the applicable recovery rules, elections and restrictions; financial-statement depreciation can differ.^[4][5]

Convert the Payments and Deductions to Cash Flows

Each year, after-tax rent is $28,000 × 0.75 = $21,000. Ownership maintenance costs $4,000 × 0.75 = $3,000 after tax. The modeled depreciation deduction is $100,000 / 4 = $25,000, producing an annual shield of $25,000 × 25% = $6,250.

Excluding the operating benefits common to both strategies, the owner therefore has a fixed annual net inflow of $6,250 − $3,000 = $3,250. This is a net tax-benefit calculation, not the machine’s total operating cash flow or profit.

At year 4, the owner’s modeled sale tax is 25% × ($20,000 − $0 tax basis) = $5,000, leaving $15,000 after tax. Use adjusted tax basis for this calculation. Actual tax character matters: gain on depreciable personal property can be ordinary income through depreciation recapture.^[6]

Place Each Difference on the Timeline

The following timeline uses positive signs for cash received or saved and negative signs for cash paid. At each date, subtract the buying cash flow from the leasing cash flow. Keep the uncertain year-4 residual separate from the fixed portion because their discount rates differ.

The recurring disadvantage of leasing is −$21,000 − $3,250 = −$24,250. Leasing avoids the purchase immediately but sacrifices the owner’s annual net benefits and final resale proceeds. There is no lease payment at time 0 in this contract.

If rent were payable in advance, four payments would occur at times 0, 1, 2 and 3. Move those payments to those dates and separately determine when their deductions reduce cash taxes. Do not automatically move the tax benefits with the payments. See ordinary annuities and annuities due for the underlying timing mechanics.

Calculate Incremental NAL

The present-value factor for four equal end-year amounts at 6% is:

Discount the residual separately: $15,000 / 1.10⁴ = $10,245.20. Then combine the avoided purchase, the recurring fixed difference and the residual forgone:

Leasing has an estimated $5,725.99 present-value advantage. The total year-4 incremental outflow is $39,250, but discounting all of it at 6% would change the model: $24,250 is the fixed component and $15,000 is the expected residual component valued at 10%.

Check NAL with Separate Lease and Buy Present Costs

A second calculation values each alternative separately. Return to the positive-cost convention: add payments and subtract tax benefits and sale proceeds. The same component must receive the same valuation treatment whichever calculation contains it.

Buy PV = $100,000 + $3,000 × AF − $6,250 × AF − $15,000 / 1.10⁴ = $78,493.20. Lease PV is $21,000 × AF = $72,767.22. Their difference, calculated before rounding, is $5,725.99, exactly matching incremental NAL.

Displayed component amounts and totals are independently rounded to cents, so adding or subtracting the displayed figures can differ by one cent. The economic comparison uses full precision. This reconciliation is a useful check on the signs in present-value analysis.

What Is the Break-Even Lease Payment?

Keep the same four years of service, included maintenance, end-year payment dates, 25% usable rent deductions, ownership costs and discount rates. Change only the level annual rent. The business is indifferent when the lease’s after-tax present cost equals the buying cost.

The chart shows how NAL changes around that threshold. Its horizontal zero series marks equal modeled present costs; points above it favor leasing and points below it favor buying.

At $30,000 annual rent, leasing retains only about $528.33 of present-value advantage; at $32,000, buying is cheaper by $4,669.33. Each $1,000 increase in annual rent reduces NAL by $1,000 × 0.75 × AF = $2,598.83. A changed maintenance package or payment schedule requires a new threshold.

Avoid Double-Counting Loan Principal and Interest

The model includes the machine’s full purchase price and uses the stated debt-equivalent discount convention. It therefore excludes a separate loan-proceeds, principal-repayment, interest-payment and interest-tax-shield schedule. Adding that schedule on top would mix valuation approaches; ACCA identifies this as a common lease-buy modeling error.^[2]

A model can instead explicitly analyze debt cash flows and the remaining equity investment, or value financing effects separately. That requires consistent cash-flow definitions and discounting throughout. Do not count the $100,000 purchase once at time 0 and then charge principal repayment as another acquisition cost without accounting for the associated financing correctly.

Affordability remains a separate constraint. A preferable present value does not guarantee that the company can fund the upfront purchase or satisfy a lease’s required payments. Lease obligations also commit future cash; a low initial payment does not make that commitment disappear.

NAL vs. Lease Accounting and Other Comparisons

Three questions must stay separate: what does the contract economically cost, how is it reported, and how is it taxed?

The reporting distinction does not calculate NAL or determine federal income-tax treatment. For U.S. federal tax purposes, the IRS asks whether the agreement is a lease or a conditional sales contract based on the facts and circumstances. Equity accumulation, title-transfer terms or a nominal purchase option can be relevant indicators; the IRS states that no single test always applies.^[3] See lease accounting under ASC 842 for the reporting mechanics.

If an agreement is a conditional sale for tax purposes, do not automatically deduct the full payment as rent. Rebuild the tax cash flows using the applicable ownership and financing treatment. An ordinary lessee generally does not depreciate the lessor’s underlying asset cost; separate lessee-funded improvements may have their own treatment.^[3][4]

Tax asymmetry can help explain a competitive lease offer. A lessor that can use ownership benefits more effectively, or has lower purchasing and servicing costs, may share an advantage through lower rent.^[7] That is a possible source of value, not a guarantee that leasing saves taxes. The lessee must still compare the actual rent with its own forgone ownership benefits.

Other decision tools answer different questions. Equivalent annual cost addresses annualized service costs, including unequal-life replacement assumptions. Commercial lease analysis and effective rent compare occupancy payments, concessions and expense obligations. Neither replaces the ownership, tax and residual cash flows required for this NAL example.

How to Evaluate an Actual Lease Offer

1. Define the service and endpoint. Match capacity, maintenance, uptime, operating benefits and the time at which the asset will be returned, sold or retained.
2. Read both sets of terms. Gather the installed purchase price, lease dates, deposits, fees, tax responsibilities, maintenance, insurance, use restrictions, termination clauses and options.
3. Build actual tax cash flows. Establish tax ownership, deductible amounts, the ownership depreciation schedule, tax basis and when benefits can reduce cash taxes.
4. Value the components coherently. Justify rates for debt-like differences and risky proceeds. Keep nominal or real amounts, periods and financing conventions consistent.
5. Reconcile and challenge the result. Calculate separate present costs and incremental NAL. Test rent, tax usability, resale, downtime and service changes with scenario analysis.

The existing annuity tool can check a level-payment present-value factor when its timing and rate settings match the contract. It does not determine tax deductions, residual risk or the complete net advantage to leasing.

Common Mistakes

1. Comparing rent with the loan payment alone. The alternatives may have different deposits, maintenance coverage, tax benefits, remaining debt and asset values. Compare complete strategies over the same horizon.

2. Reversing the NAL sign. Under this article’s definition, positive NAL favors leasing. A source using lease cost minus buy cost will have the opposite sign rule.

3. Giving the lessee both rent deductions and the owner’s depreciation shields. Establish tax ownership. The example assumes those underlying-asset depreciation deductions belong to the owner, so leasing forfeits them.

4. Treating a deduction as an immediate cash refund. Taxable-income availability, limitations and payment timing determine its usable cash benefit. Replace an assumed immediate shield with the actual schedule.

5. Counting maintenance or the purchase twice. Included lease maintenance is already in the rent. The ownership outlay and a financing schedule also cannot simply be piled together.

6. Using book value or a single rate without checking. Disposal taxes depend on adjusted tax basis and applicable tax character. An uncertain resale value does not become debt-like because it shares a date with the final payment.

Limitations of Net Advantage to Leasing

Taxes and omitted charges can change the ranking. Actual models may require sales/use taxes, property taxes, delivery, installation differences, origination fees, deposits and their recovery, insurance, selling costs, capitalized improvements and different tax-treatment dates. Accelerated cost recovery may change ownership benefits; use current applicable rules rather than the example’s invented schedule.^[5]

Asset risk is not always fully transferred. A lessee may face excess-use, damage, restoration or residual-guarantee payments. A return obligation differs from an unrestricted ability to walk away. Conversely, an owner may benefit from better-than-expected resale. Ownership and contract terms determine the exposure.^[7]

Options and changing needs require additional analysis. A renewal, purchase, upgrade or cancellation right can matter, but its economic value is not simply its stated exercise price. Model plausible exercise decisions and resulting payments, ownership, taxes and remaining value. Do not add an owner’s residual to a lease strategy that returns the asset, or assume the right to buy is free.

A financing constraint can affect feasibility. Special subsidized loans, restricted interest deductions, delayed tax benefits, different debt capacity or financial-distress costs can invalidate the simplified after-tax borrowing convention. Those effects require a consistent expanded model. A spreadsheet’s precise result cannot remove uncertainty in the inputs.

Sources

Sources accessed November 6, 2026. All business amounts and rates in the worked example are hypothetical. Historical finance publications support the valuation concepts; current tax characterization is discussed using the IRS sources. The FASB document is the original standard amendment’s summary, not an exhaustive account of later amendments.

1. Michigan State University Libraries, Lindon Robison, Financial Management for Small Businesses, chapter 18: Leases, Net Present Cost of Leasing versus Purchasing. Used for present-cost comparison and break-even concepts, not its historical tax tests.
2. ACCA, Financial Management, September/December 2021 Examiner’s Report, Hawker Co, requirement (a), pages 10–12: financing comparison, differential flows, discount convention, timing and double-counting errors.
3. IRS, Income & Expenses 7, equipment lease payments versus conditional sales contracts.
4. IRS, Publication 946 (2025): How To Depreciate Property, chapter 1, Property You Own, Leased Property and Incidents of Ownership.
5. IRS, Topic no. 704: Depreciation, cost recovery, eligibility and depreciation-system background.
6. IRS, Publication 544 (2025): Sales and Other Dispositions of Assets, Gain or Loss and Section 1245 Property, including Gain Treated as Ordinary Income.
7. Aswath Damodaran, NYU Stern, Leases, Debt and Value (April 2009), Leasing versus Borrowing: Making the Choice, pages 35–36. Used for economic reasons to lease, not current accounting rules.
8. Aswath Damodaran, NYU Stern, Approaches to Valuation, chapter 2, Basis for Discounted Cashflow Valuation and the discussion of component cash-flow risks, pages 1–3.
9. FASB, ASU 2016-02: Leases (Topic 842), Section A (February 2016), Summary, Lessee Accounting, pages 2–4.