What is the main difference between a demand note and an installment note?

An installment note has a fixed payment schedule: a specific amount is due on a specific date (monthly, quarterly, etc.) until the loan is paid off. A demand note has no fixed schedule; the lender can ask for repayment of the full balance at any time by giving the borrower proper notice. Both are legally enforceable promissory notes; the difference is entirely in the repayment structure.

How does the lender call a demand note?

Typically by sending the borrower a written demand notice. The note should specify the required notice period (30 days is common, though some notes use 10 or 15 days). The notice states that the lender is demanding full repayment and gives the borrower until the notice period expires to pay. If the borrower does not pay, the lender can then sue on the note. Always send demand notices by certified mail with return receipt to document delivery.

Can a demand note include interest?

Yes. A demand note with no interest is possible but unusual for arms-length transactions. More commonly, the note specifies an interest rate that accrues on the outstanding balance until repayment. For loans above $10,000 between related parties, the rate should meet or exceed the IRS Applicable Federal Rate to avoid imputed-interest treatment. Check our Usury Limit Checker for your state's maximum rate.

When does a demand note make the statute of limitations clock start?

For demand notes, the statute of limitations typically does not start running until the lender makes an actual demand for repayment. This is a significant advantage over installment notes for long-horizon loans: an installment note that goes into default starts the limitation clock immediately; a demand note gives the lender more flexibility on timing. However, some states impose a maximum outer limit (often several years from origination) on demand notes regardless of when demand is made. Check your state using our Statute of Limitations Lookup tool.

Can a demand note still specify regular interest payments?

Yes. A common hybrid structure is a demand note that requires periodic interest-only payments (monthly or quarterly) but leaves the principal repayable on demand. This gives the lender regular cash flow from interest while keeping the flexibility to call the principal at any time. If the borrower misses an interest payment, that alone is typically a default event, giving the lender grounds to demand the full balance.

Is an installment note better for the borrower?

Generally yes, because the payment schedule is predictable. The borrower knows exactly what is due each month and when the loan ends. Demand notes create uncertainty: the lender could technically call the note at an inconvenient time. For that reason, demand notes are more common in transactions where the lender and borrower have a close relationship and the lender does not intend to call unless something goes wrong, or in business situations where flexibility genuinely benefits both parties.

Can I convert a demand note to an installment note?

Yes, with a written modification agreement signed by both parties. You would define the principal balance at the date of conversion, set a new interest rate and payment schedule, and give the new note a maturity date. The modification should reference the original note and state that the original note is amended and restated in full. Both parties sign and date the modification. This also resets the statute of limitations from the modification date.

Demand Note vs Installment Note: When Each Makes Sense

Both are real, enforceable promissory notes. The difference is whether repayment runs on a fixed schedule (installment) or at the lender's discretion (demand). Picking the wrong one for your situation creates friction later.

Installment note: the structured path

An installment note defines everything in advance: how much is borrowed, the interest rate, the monthly (or quarterly) payment amount, and the exact date the loan ends. Each payment covers a portion of principal plus accrued interest, just like a bank loan.

When installment notes work best:

The borrower has a predictable income and can commit to a fixed payment schedule.
Both parties want certainty: the lender knows when payments arrive, the borrower knows when the loan ends.
The loan is large enough that a single bullet repayment would be difficult for the borrower.
The loan is for a specific purchase (vehicle, equipment, home improvements) where the asset's useful life aligns with the repayment term.
Family loans where the lender wants a clear, documented arrangement that feels "businesslike."

Installment notes are also the cleanest for IRS compliance: you know the exact schedule, the interest allocated to each payment, and the date the note is paid off.

Demand note: the flexible path

A demand note has no fixed repayment schedule. The full balance (plus accrued interest) is due when the lender sends written notice demanding repayment. Until that demand is made, the borrower typically makes interest-only payments (or sometimes no payments at all, depending on how the note is drafted).

When demand notes work best:

The timing of repayment is genuinely uncertain (the borrower expects a lump sum from a property sale, business deal, or inheritance, but the exact date is unknown).
The lender wants maximum flexibility and does not anticipate needing the money for a while, but wants the right to call it if circumstances change.
Short-term bridge loans: a business owner borrows operating capital and expects to repay from the next major receivable.
Owner-to-business loans where the business will repay when cash flow allows, and the owner does not want to bind the business to a fixed schedule during a growth phase.

Demand Promissory Note Installment Promissory Note

The demand note is still a real obligation

A common misconception is that a demand note is "softer" than an installment note. It is not. The borrower still owes every dollar. The lender can still demand full repayment at any time with proper notice. If the borrower cannot pay when called, the lender can sue on the note, get a judgment, and pursue the borrower's assets.

The flexibility cuts both ways: the borrower may be able to repay early without penalty (worth spelling out in the note), but the lender can also call the note at an inconvenient time for the borrower. If the borrower needs protection against a demand at an inopportune time, consider an installment note instead.

Interest: how it works in each structure

Installment note: Each payment is divided between principal reduction and interest. Early payments are mostly interest; later payments are mostly principal. The note specifies the rate, and the document (or an amortization schedule) shows the breakdown.

Demand note: Interest typically accrues on the outstanding principal balance at the stated rate per day (or per annum, computed daily). When the lender demands repayment, the balance owed is the principal plus all accrued-but-unpaid interest through the demand date. If the note requires periodic interest payments (monthly or quarterly), the borrower pays accrued interest on those dates, keeping the principal balance unchanged until the demand is made.

In both cases, check the rate against your state's usury cap using our Usury Limit Checker.

Statute of limitations: the key timing difference

This is where the two structures diverge most significantly for lenders:

Installment note. The statute starts running at the first uncured missed payment. If the borrower stops paying in month 3 and you do not act for years, you may lose your right to sue.
Demand note. The statute generally does not start until the lender makes a formal demand. You retain the legal right to collect as long as you have not made a demand and then let the resulting limitation period expire.

This advantage makes demand notes attractive for longer-horizon family loans where the lender does not want to be locked into an enforcement clock. Use our Statute of Limitations Lookup to see your state's rules, including any outer-limit rules for demand notes.

Which one should you use?

Start with this question: does the borrower have a predictable, regular income that can support a fixed monthly payment? If yes, an installment note is cleaner for both parties. If the repayment timing is genuinely uncertain, or if the loan is short-term with an expected lump-sum payoff, a demand note fits better.

For most family and friend loans, an installment note is the better choice: it creates a clear schedule, reduces ambiguity, and the discipline of a payment date helps both sides treat the loan seriously.