Mobile Home Park Seller Financing: Tax Planning for Sellers

Seller financing is a common closing structure in the mobile home park market. Buyers want flexible acquisition financing in a market where commercial lenders can be slow and conservative. Sellers want to move a park, sometimes command a higher price, and — often — defer a large capital gains tax by receiving proceeds over time rather than in a lump sum.

This guide is written for the MHP seller. If you are considering carrying a note when you sell your park, the installment sale rules under IRC Section 453 provide real tax planning opportunities — but they come with specific mechanics, risk factors, and traps that are essential to understand before you close.

How Installment Sale Treatment Works for MHP Sellers

When you sell a mobile home park and carry back a note — agreeing to receive the purchase price over multiple years — you are generally eligible to use the installment method under IRC Section 453. The installment method allows you to recognize gain proportionally as you receive payments, rather than recognizing the entire gain in the year of sale.

This is a significant benefit. If you sold your park for $3 million with a $1 million basis and a $2 million gain, an all-cash sale in year one means $2 million of gain recognized in year one — and the associated tax is due in April of the following year. Under the installment method, if you receive $600,000 in year one and the balance over five years, you recognize only the taxable gain proportional to the payments received each year. The tax liability is spread over the note term, and the deferred tax effectively functions as an interest-free loan from the government for the portion not yet recognized.

The Gross Profit Ratio: The Key Calculation

The installment sale calculation centers on the gross profit ratio (GPR), also called the gross profit percentage. The GPR determines what fraction of each installment payment is recognized as gain versus return of basis.

The formula: Gross Profit Ratio = Gross Profit / Contract Price

Gross Profit is the selling price minus the adjusted basis of the property. Contract Price is the selling price minus any qualifying indebtedness assumed by the buyer (if the park had an existing mortgage that the buyer assumed, it reduces the contract price).

Every payment you receive is multiplied by the GPR to determine the taxable portion. The remainder is a return of basis — not taxable. This ratio stays constant throughout the note term, regardless of when payments are received.

Example: You sell a park for $2 million with an adjusted basis of $500,000. No existing mortgage. Gross Profit = $1.5 million. Contract Price = $2 million. GPR = 75%. Every payment you receive, 75% is taxable gain and 25% is return of basis.

Interest Income on the Seller Note: Taxed as Ordinary Income

When you carry a seller note at an interest rate, the interest income you receive each year is taxed as ordinary income — not as capital gain. This is a critical point that many MHP sellers overlook when calculating the after-tax yield on a seller-financed deal.

If you carry a $1.5 million note at 6% interest, you will receive approximately $90,000 in interest income in the first year (before amortization reduces the balance). That $90,000 is taxed at ordinary income rates — potentially 37% at the highest bracket, plus state income taxes — not at the 20% preferential rate that applies to long-term capital gains. The effective after-tax yield on the interest is lower than the stated rate, which affects the economics of seller financing versus an all-cash sale.

This distinction between the gain component (capital gain character, potentially eligible for preferential rates) and the interest component (ordinary income character) must be modeled when evaluating whether seller financing makes financial sense relative to an all-cash alternative.

The Risk of Buyer Default: What Happens to Deferred Tax

The installment method’s benefit — deferred gain recognition — comes with a risk that all-cash sales do not have: the risk of buyer default. If the buyer stops making payments and ultimately defaults on the note, what happens to the deferred gain you have not yet recognized?

Under the installment sale rules, if the buyer defaults and you repossess the property, the repossession is generally treated as a disposition of the note and triggers gain recognition. The gain on repossession is computed under specific rules that take into account the basis of the note (which reflects the gain already deferred) and the fair market value of the repossessed property.

If the buyer defaults without a repossession — simply stops paying and the note becomes uncollectible — the loss you recognize on the bad debt is limited to your basis in the note, not the face amount. Since the gain deferred in the installment sale creates a very low basis in the note (the unrecognized gain represents a zero-basis portion of the note), a bad debt on an installment note may produce little or no offsetting deduction for the deferred tax you owe.

This is a real risk. Before carrying a note, evaluate the buyer’s creditworthiness carefully. Seller financing is not just an exit strategy — it is a credit extension. You are the lender. Treat it accordingly.

The Wrap-Around Mortgage: A Phantom Income Trap

If your park has an existing mortgage and you sell on a wrap-around basis — where the buyer makes payments to you and you continue making payments on the underlying loan — additional complexity arises. In a wrap-around structure, the underlying loan payoff may not occur at closing, which means the full proceeds from the wrap payments may not equal the face amount of the note you carry.

More importantly, if the mortgage balance exceeds your adjusted basis in the property (which can happen after years of cost segregation and bonus depreciation), the excess mortgage over basis is treated as a payment received in the year of sale under the installment sale rules — even though you received no cash. This phantom income must be recognized in year one and can create taxable income without a corresponding cash payment to cover the tax. The computation is complex and requires careful analysis before the sale closes.

Imputed Interest: The Below-AFR Rate Problem

The Applicable Federal Rate (AFR) is the minimum interest rate the IRS allows on seller-financed transactions. If the interest rate on the seller note is below the applicable AFR for the term of the note, the IRS will impute interest at the AFR rate — recharacterizing a portion of what you called “principal” into interest income. This increases your ordinary income and reduces the capital gain component of each payment.

The current AFRs are published monthly by the IRS (Revenue Ruling AFR tables) for short-term, mid-term, and long-term rates. Before setting the interest rate on a seller note, confirm the current AFR and set your rate at or above it. Using a rate below the AFR to structure the transaction does not save tax — the IRS overrides it with imputed interest.

Structuring the Note for Maximum Installment Sale Benefit

Several structural decisions affect how the installment sale performs from a tax standpoint:

Down payment size. A smaller down payment means less gain recognized in year one — more of the gain is deferred. A larger down payment front-loads the gain recognition. Model the tax impact of different down payment scenarios before negotiating.

Note term. A longer note term spreads the gain over more years. In general, a longer note means smaller annual gain recognition and more time for tax-deferred compounding. The trade-off is greater credit risk exposure over a longer period.

Balloon payment structure. Notes with a balloon payment at maturity concentrate the gain in the balloon year. The tax planning consideration is whether you will have resources available to pay the tax in the balloon year and whether your tax situation in that year will be favorable.

Note versus earnout. An earnout — where the purchase price is contingent on future park performance — has different tax treatment than a fixed note. Consult your MHP accountant before agreeing to any contingent payment structure.

Dodd-Frank and SAFE Act: A Brief Note for Sellers

The Dodd-Frank Wall Street Reform and Consumer Protection Act and the Secure and Fair Enforcement for Mortgage Licensing Act (SAFE Act) impose requirements on certain seller financing arrangements, particularly those involving manufactured homes classified as personal property (chattel) rather than real property. If you are selling manufactured homes as part of the transaction — not just the park land — and carrying financing on the homes, the SAFE Act requirements may apply to you as a “loan originator.” This is a legal compliance question requiring review by an attorney familiar with both manufactured housing law and SAFE Act requirements in your state. It is noted here for awareness — it is not within the scope of tax advice.

For more on how MHP sales create other tax planning considerations, see our guide on 1031 exchange identification rules for MHP sellers who prefer to defer rather than recognize gain at sale, and our overview of first-year MHP tax planning for new buyers acquiring under seller financing arrangements.

Comparison Table: All-Cash Sale vs. Installment Sale for MHP Sellers

Disclaimer: This content is for educational purposes only and does not constitute tax, legal, or financial advice. Installment sale rules are complex and fact-specific. Dodd-Frank and SAFE Act considerations require review by a qualified attorney. Consult a qualified tax professional before structuring any seller-financed transaction.