Finance or Pay Cash for an Airplane? An Opportunity-Cost Comparison

This page is for buyers who could write a check for the airplane and are deciding whether they should. It compares paying cash with financing on the same aircraft, using computed loan math and clearly labeled return assumptions.

The fair way to compare cash and financing

Most comparisons put the loan's total interest against the "lost" investment growth on the full price. That double-counts, because the financed buyer also has to come up with the monthly payment. A fair comparison gives both buyers the same starting cash and the same monthly budget:

• Cash buyer: pays $150,000 today, then invests $1,047 every month, the amount the other buyer spends on the loan.
• Financing buyer: puts $22,500 down, invests the $127,500 kept, and pays $1,047 a month on a $127,500 loan at 7.75% for 20 years.

Both own the same airplane, so its value, insurance and operating costs cancel out. What's left is each buyer's investment account, minus any loan balance the financing buyer still owes. In this setup the break-even return is exactly the loan rate. The rest of the decision comes down to whether you can reliably beat it after tax, and what the cash is worth to you in the meantime.

Worked example: a $150,000 airplane, cash vs 15% down

Which path comes out ahead, and by how much, at each horizon:

Assumed returns are illustrative, not forecasts. Investment returns are not guaranteed and can be negative. Loan fees, which would raise the break-even, are excluded.

To see where the numbers come from, take the 6% case at 10 years. The cash buyer's monthly investments grow to $171,534. The financing buyer's $127,500 grows to $231,973, but they still owe $87,218 on the loan, which leaves $144,755. The cash buyer is $26,779 ahead. At 9%, the result flips and financing is $22,777 ahead.

Three things the table makes clear:

• The gap compounds. At an assumed 4% after-tax return held for 20 years, paying cash comes out $100,527 ahead.
• The loan's cost is certain; the investment return isn't. Financing to invest is a leveraged bet on beating 7.75% after tax. For context, the 10-year Treasury yielded about 5.2% before tax in late September 2026 (FRED), and piston loans priced around 7%–10% (AOPA, FLYING Finance). On a risk-free basis, paying cash wins at September 2026 rates.
• Returns must be after tax. Personal-use aircraft loan interest generally isn't deductible, while investment gains are taxed. Compare like with like.

Model other prices and rates with the aircraft loan calculator.

Liquidity: what cash can't do once it's in the airplane

The table measures wealth, not flexibility. Cash sunk into an airplane is only available again if you sell or borrow against the aircraft. That matters most in the first years of ownership:

• Maintenance surprises. A first annual with findings, a cylinder, an avionics failure. Owners who paid cash and kept nothing back end up borrowing at worse terms than an aircraft loan.
• Business capital. If your business can deploy cash at returns well above the loan rate, keeping it there can be worth the interest.
• Emergencies unrelated to flying. A loan payment is a fixed obligation, but a depleted emergency fund is a bigger risk.

Financing has its own costs beyond interest. The lender requires hull insurance with it as loss payee, closing includes lien filing and the lender's paperwork, and there may be fees. A cash buyer can decide whether to insure the hull at all. Cash buyers can also regain liquidity later with a loan secured by the paid-off aircraft, subject to underwriting at that time. See refinancing your aircraft loan.

Tax: financing doesn't change depreciation

For an aircraft used in a business, the big deductions come from depreciation, and depreciation is based on the aircraft's cost whether you paid cash or borrowed:

• Bonus depreciation. 100% bonus depreciation is permanent for eligible property acquired after January 19, 2025, under the One Big Beautiful Bill Act (IRS).
• Section 179. The limit is $2,560,000 for tax years beginning in 2026, phasing out above $4,090,000 of qualifying purchases (Rev. Proc. 2025-32).
• The 50% test. Aircraft are listed property. If qualified business use isn't more than 50%, bonus depreciation and Section 179 are unavailable (IRS Pub. 946).
• Interest. Interest on the business-use portion of a loan may be deductible. For example, at an assumed 32% marginal rate, a fully deductible 7.75% loan costs about 5.27% after tax, which lowers the break-even in the table. Personal-use interest generally isn't deductible.

These rules are summarized, not applied to you. Confirm with a CPA or aviation tax specialist. See aircraft depreciation and tax, business aircraft tax advantages and tax strategies for piston owners.

When paying cash wins

• Your realistic after-tax return is below the loan rate. With piston loans around 7%–10% as of September 2026, that's true for most conservative portfolios.
• You'll still have strong reserves afterward. The main argument for financing, liquidity, doesn't apply.
• Short ownership. Loan fees and closing costs are spread over fewer years.
• Older aircraft with tight terms. If lenders want 20%–30% down and a short term, the loan offers little flexibility for its cost.
• Personal use with no deductible interest. You pay the full rate.
• You'd rather self-insure the hull or simply own the airplane free and clear.

When financing wins

• Your cash has a dependable use that earns more than the loan's after-tax cost, such as your own business.
• Paying cash would leave thin reserves for maintenance or emergencies.
• Business use makes the interest deductible, lowering the effective rate.
• You want time to decide. You can finance now and prepay later if the note allows it, but you can't easily un-spend cash.

Middle paths

• A bigger down payment. Put 25%–40% down and keep a solid reserve. The payment math for 15%, 20% and 30% down is in aircraft down payment strategies.
• Finance, then prepay. Keep the cash through the first annual, then pay down principal. Confirm there's no prepayment penalty first.
• Pay cash, borrow later if needed. Buy outright and arrange a loan secured by the aircraft if a better use for the cash appears.

A quick decision checklist

1. Get a real loan quote. The rate is the break-even.
2. Estimate your realistic after-tax return on the cash you'd keep, conservatively.
3. Adjust the loan cost for any deductible business-use interest, with a CPA.
4. Check reserves: after paying cash, can you still cover an annual with findings, a major repair and a household emergency?
5. Decide how long you'll own the aircraft.
6. If the return clearly exceeds the loan cost, or reserves would be thin, finance. Otherwise, cash is the lower-cost path.

How this guide differs from related guides

This page covers whether to borrow at all. For how much to put down if you finance, see aircraft down payment strategies. For leasing instead of owning, see leasing vs buying a piston aircraft and lease-to-own vs a traditional loan. For other structures, see alternative aircraft financing. For how aircraft loans work in the first place, see how aircraft loans work.

Frequently asked questions