Seller Financing Amortization Calculator

Build a full month-by-month amortization schedule for a seller-financed note. Handles common structures: 30-year amortization with short balloon, optional principal prepayments, and balance tracking.

Note principal

Rate

Amortization (yr)

Balloon (yr)

Extra monthly

Monthly payment

$1,818

Balloon due

$238,769

Interest to balloon

$131,477

Month	Payment	Principal	Interest	Balance
1	$1,817.96	$192.96	$1,625.00	$259,807
2	$1,817.96	$194.16	$1,623.79	$259,613
3	$1,817.96	$195.38	$1,622.58	$259,418
4	$1,817.96	$196.60	$1,621.36	$259,221
5	$1,817.96	$197.83	$1,620.13	$259,023
6	$1,817.96	$199.06	$1,618.89	$258,824
7	$1,817.96	$200.31	$1,617.65	$258,624
8	$1,817.96	$201.56	$1,616.40	$258,422
9	$1,817.96	$202.82	$1,615.14	$258,219
10	$1,817.96	$204.09	$1,613.87	$258,015
11	$1,817.96	$205.36	$1,612.60	$257,810
12	$1,817.96	$206.65	$1,611.31	$257,603
24	$1,817.96	$222.69	$1,595.27	$255,020
36	$1,817.96	$239.98	$1,577.98	$252,237
48	$1,817.96	$258.61	$1,559.35	$249,238
60	$1,817.96	$278.68	$1,539.28	$246,005
72	$1,817.96	$300.32	$1,517.64	$242,522
84	$1,817.96	$323.63	$1,494.33	$238,769

Editorial noteMaintained by EveryCalc - Reviewed June 2026

EveryCalc calculators are designed for fast, practical estimates with transparent inputs and no required account. We use plain formulas, visible assumptions, and related tools so visitors can check the result from more than one angle.

Results are informational only. For financial, tax, legal, medical, construction, or other high-impact decisions, verify the output against primary sources or a qualified professional.

Learn more about our review process on the EveryCalc methodology page.

How this calculator works

What this page estimates

This Seller Financing Amortization Calculator is built to give a quick, browser-based estimate for seller financing amortization. Build a full month-by-month amortization schedule for a seller-financed note. Handles common structures: 30-year amortization with short balloon, optional principal prepayments, and balance tracking. The inputs stay on the page during normal use, and the result should be treated as an estimate for planning, comparison, or education rather than professional advice.

Calculation approach

The calculator applies the standard relationship implied by the inputs, then formats the answer so it can be checked and reused. For finance tools, the most important step is using consistent units, rates, time periods, and assumptions before comparing the result with another calculator or outside quote.

Example workflow

For example, start with a realistic value you already know, change one input at a time, and watch how the answer moves. That makes it easier to tell whether the result is being driven by the main amount, the rate, the time period, or a unit conversion.

Practical checks

Use current, real-world numbers when the result affects money, health, tax, or legal decisions.
Run a low, base, and high case when the inputs are estimates.
Check the related calculators below when the next decision depends on a different assumption.

How to interpret the seller financing amortization result

Best use

Use the result as a planning number for comparing payments, rates, returns, tax reserves, or cash-flow choices before you request a quote or make a commitment.

Cross-check

Compare the answer with the contract, lender estimate, tax form, brokerage statement, payroll record, or invoice that will control the real-world outcome.

Watch for

Do not rely on a single optimistic rate, return, or fee assumption. Money pages work best when you run low, base, and high cases and keep professional advice separate from the estimate.

This page belongs to the Finance calculator library, so the answer should be read in the context of the decision you are modeling rather than as a universal rule.

Before relying on this seller financing amortization estimate

Most calculator mistakes come from the inputs, not the arithmetic. Use this short audit before you reuse the answer in a spreadsheet, quote, application, or important conversation.

Confirm source numbers

Match balances, rates, fees, taxes, income, and payment dates against the lender quote, payroll record, tax form, statement, invoice, or contract.

Separate cash flow from total cost

A lower monthly payment can still cost more over time if fees, interest, taxes, or a longer term are hidden in the structure.

Run conservative cases

Test at least one higher-cost or lower-return case before using the output for a purchase, refinance, investment, loan, or tax decision.

Rerun this page when the rate, price, term, fee, tax rule, income, expense, or expected holding period changes.

How to Use

Enter note principal, rate, amortization years (typically 30), and balloon years.
Add optional extra monthly principal payments.
Review monthly schedule and balloon amount due.

Frequently Asked Questions

Why 30-year amort with a short balloon?

Keeps the buyer's monthly payment affordable (30-year amortization) while giving the seller a defined exit (balloon). Common structures: 30/5, 30/7, 30/10 — with the number after the slash being the balloon year.

Can the buyer prepay without penalty?

Depends on note language. Default seller-carry notes often allow prepayment without penalty. Some notes add prepayment penalties (common in commercial seller carry) — always negotiate and review the note itself.

What if the buyer can't pay the balloon?

Three options: the seller extends the balloon (often for a fee or rate adjustment), the buyer refinances into a bank mortgage, or the seller forecloses. The prospect of refinance is usually built into buyer qualification.