If you are investing in or servicing private mortgage notes, understanding the core vocabulary is the first step toward managing risk and protecting your position. This glossary defines 15 foundational terms used across private mortgage lending and servicing, from origination through payoff or default resolution.

1. Mortgage Note / Promissory Note

A mortgage note, also called a promissory note, is the legal document in which a borrower makes a written promise to repay a specified sum of money to the lender under agreed-upon terms. It outlines the loan amount, interest rate, repayment schedule, and consequences of non-payment. The note is the primary evidence of the debt and travels with the loan through any subsequent sale or assignment. Private mortgage notes function outside conventional lending channels, making proper documentation especially important.

2. Mortgagor (Borrower)

The mortgagor is the individual or entity that borrows money and pledges real property as collateral to secure the loan. In a private mortgage transaction, the mortgagor signs both the promissory note and the mortgage or deed of trust, granting the lender a security interest in the property. The mortgagor retains possession and use of the property while making required payments, but risks losing the property through foreclosure if they fail to meet their obligations.

3. Mortgagee (Lender)

The mortgagee is the lender or investor who extends credit and receives a security interest in the borrower’s real property. In private lending, the mortgagee may be an individual, a fund, or an entity that holds the note either directly or through a trust structure. The mortgagee has the legal right to enforce the terms of the note and to initiate foreclosure proceedings if the borrower defaults. When a note is sold, the mortgagee designation transfers to the new note holder.

4. Principal Balance

The principal balance is the outstanding amount of the original loan that a borrower still owes, excluding any accrued interest, fees, or penalties. With each scheduled payment, a portion retires interest and the remainder reduces the principal balance. For example, on a $150,000 note at 8% interest with a 30-year amortization, the first monthly payment of approximately $1,101 would apply roughly $1,000 to interest and only $101 to principal. Tracking the current principal balance accurately is essential for payoff calculations, note sales, and default analysis.

5. Interest Rate

The interest rate is the annual percentage charged on the outstanding principal balance as compensation to the lender for the use of their capital. Private mortgage notes typically carry fixed interest rates, though some structures include adjustable components. The stated rate drives the amortization schedule and determines how much of each payment applies to interest versus principal reduction. A higher rate results in slower equity accumulation for the borrower and greater income for the note holder, particularly in the early years of the loan.

Expert Take

Interest rate documentation in private mortgage notes is not merely a disclosure formality. The rate establishes the legal boundary for what a servicer can collect, and errors in rate application compound over time. A servicer applying even a fractional rate error across hundreds of payments can create meaningful exposure for the note holder — both in terms of over-collection risk and under-collection loss. Precision in the original note language and consistent application throughout the servicing lifecycle are non-negotiable.

6. Amortization Schedule

An amortization schedule is a complete table showing every scheduled payment over the life of the loan, breaking each payment into its interest and principal components and tracking the declining principal balance. Private mortgage note servicers rely on the amortization schedule to apply payments correctly, calculate payoff amounts, and respond accurately to borrower inquiries. Any modification to loan terms — such as a rate change or term extension — requires a new amortization calculation to maintain accurate records.

7. Escrow Account

An escrow account is a separate account maintained by the servicer to collect and hold funds for the borrower’s property taxes, hazard insurance premiums, and in some structures, other property-related obligations. The servicer collects a prorated portion of these expenses with each monthly payment and disburses funds to the appropriate parties when obligations come due. Properly structured escrow accounts protect both the note holder and the borrower by ensuring that taxes are paid and insurance remains in force. For a detailed look at how escrow accounts are set up in private mortgage note servicing, see 5 Things About Escrow Account Setup for Private Mortgage Notes.

8. Servicing Rights

Servicing rights refer to the contractual authority and obligation to manage a mortgage loan on behalf of the note holder, including collecting payments, maintaining records, managing escrow, and handling borrower communications. Servicing rights can be retained by the note originator, transferred to a third-party servicer, or sold independently of the note itself. When a note changes hands, the associated servicing rights must be clearly assigned to avoid confusion over who has the authority to collect, communicate with the borrower, and enforce loan terms.

9. Assignment of Mortgage

An assignment of mortgage is the legal instrument that transfers the mortgagee’s interest in a mortgage from one party to another. When a private mortgage note is sold or transferred, the assignment must be recorded in the county where the property is located to establish the new note holder’s rights in the public record. Without a properly executed and recorded assignment, the new owner’s ability to enforce the note or initiate foreclosure may be legally challenged. Maintaining a clean chain of assignments is fundamental to note portfolio management.

10. Deed of Trust

A deed of trust is a security instrument used in many states as an alternative to a mortgage. It involves three parties: the borrower (trustor), a neutral third party (trustee), and the lender (beneficiary). The borrower conveys the property title to the trustee, who holds it on behalf of the lender until the loan is paid in full. In the event of default, the trustee can conduct a non-judicial foreclosure sale in states that permit it, often making the process faster than a traditional mortgage foreclosure. Whether a note is secured by a mortgage or deed of trust depends on the state where the property is located.

11. Acceleration Clause

An acceleration clause is a provision in the mortgage note that allows the lender to demand immediate repayment of the entire outstanding principal balance if the borrower breaches a specified condition, most commonly by missing payments or allowing insurance to lapse. Once acceleration is triggered and the borrower is notified, the full balance becomes due rather than just the past-due amount. Acceleration is typically the legal step that precedes foreclosure proceedings. Note holders and servicers must follow applicable state notice requirements before enforcing this clause.

12. Due-on-Sale Clause

A due-on-sale clause, also known as an alienation clause, requires the borrower to pay off the entire outstanding loan balance if the secured property is sold or transferred without the lender’s consent. This protects the note holder from having a buyer assume a below-market-rate loan without approval. Private mortgage notes frequently include due-on-sale provisions, and servicers must monitor property transfers to enforce this clause when applicable. Failure to enforce can inadvertently allow an unauthorized assumption and complicate the note holder’s position.

13. Loan-to-Value (LTV)

Loan-to-value is the ratio of the outstanding loan balance to the current appraised or estimated market value of the secured property, expressed as a percentage. For example, a $120,000 balance on a property valued at $200,000 represents a 60% LTV. LTV is a primary risk metric for private mortgage note investors because it indicates the equity cushion available in the event of default. A lower LTV generally means greater protection for the note holder, while a high LTV leaves little margin if the property must be liquidated through foreclosure.

14. Default

A default occurs when a borrower fails to meet any material obligation under the terms of the mortgage note, including missed payments, failure to maintain adequate insurance, or non-payment of property taxes. Monetary default — missed payments — is the most common trigger for servicing escalation. Early identification of default risk allows servicers to intervene before a loan becomes seriously delinquent. Recognizing early warning signs is critical to protecting the note holder’s investment. For a detailed breakdown of red flags to watch for, see 7 Warning Signs a Note Is Going Non-Performing.

15. Loan Modification

A loan modification is a formal, written change to one or more of the original terms of a mortgage note, agreed upon by both the note holder and the borrower. Common modifications include temporary or permanent interest rate reductions, term extensions, capitalization of past-due amounts, or changes to the payment schedule. Modifications are often pursued as an alternative to foreclosure when a borrower is experiencing financial hardship but has demonstrated willingness to repay. Any modification must be properly documented, signed by all parties, and incorporated into the servicing record to ensure accurate payment application going forward.

Mastering these terms equips private mortgage note investors and servicers to evaluate risk, communicate precisely, and manage their portfolios with confidence. For a deeper look at how these concepts connect to broader lending and servicing risk, explore A Glossary of Core Risks in Private Mortgage Lending and Servicing — and contact Note Servicing Center to learn how professional servicing protects your note investment at every stage of the loan lifecycle.