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Seller Financing Down Payment Calculator

Seller financing lets a buyer purchase without a bank loan — the seller holds the note. Down payment sizing depends on what the seller needs for their own tax basis, any wrap loan behind, and their comfort with an LTV. This calculator helps both sides size a deal that protects seller principal, produces seller cash flow, and stays affordable for the buyer.

Purchase price

Seller's existing mortgage

Seller cash at close (beyond mortgage payoff)

Seller min LTV acceptable

Seller-note interest rate

Amortization term (years)

Balloon (years, 0 = none)

Minimum down payment

$230,000

Down %

51.1%

Seller note balance

$220,000

Monthly P&I to seller

$1,538

Balloon balance at term

$202,035

Cash-need down constraint

$230,000

LTV-driven down constraint

$67,500

Total seller cash required

$230,000

How the math works

Minimum down = the larger of (a) seller's total cash need (mortgage payoff + any additional walkaway cash) and (b) the LTV constraint (price × (1 − max LTV)). On a $450K purchase with a $180K underlying mortgage and a seller wanting $50K extra cash + 85% max LTV: cash constraint = $230K, LTV constraint = $67.5K. The binding number is $230K (51% down) — the seller's underlying mortgage and cash need dominate.

If that's too rich for the buyer, structure a wrap: seller keeps their mortgage in place, buyer pays the seller who pays the existing mortgage. Wraps reduce the cash need to just the seller's desired pocket cash — potentially a 15-20% down deal — but introduce legal complexity around due-on-sale clauses.

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 Down Payment Calculator is built to give a quick, browser-based estimate for seller financing down payment. Seller financing lets a buyer purchase without a bank loan — the seller holds the note. Down payment sizing depends on what the seller needs for their own tax basis, any wrap loan behind, and their comfort with an LTV. This calculator helps both sides size a deal that protects seller principal, produces seller cash flow, and stays affordable for the buyer. 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 down payment 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 down payment 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 purchase price and seller's existing mortgage balance (or 0 for free-and-clear).
Enter seller's tax basis and any desired cash at close (beyond mortgage payoff).
Set the proposed seller-note interest rate and term.
The calculator sizes the minimum down payment to cover seller needs and shows monthly P&I to the buyer.

Frequently Asked Questions

How much down do sellers typically require?

Traditional: 10-30% down. 10% deals are common on single-family residential seller financing. Commercial seller financing often requires 20-35% because the seller doesn't want to be in a marginally-collateralized position. Free-and-clear sellers can accept lower down; sellers with underlying mortgages (wrap deals) need enough down to cover payoff or service.

What's a fair interest rate?

0.5-2% above conforming 30-year rates is common. Sellers justify the premium by skipping bank origination fees and giving the buyer a path around bank qualification. Above 3% over conforming, the buyer should explore a bank refi in 2-3 years.

Balloon or full amortization?

80% of seller-finance deals have a balloon (3-7 years). Sellers don't want to hold 30-year paper. Buyer has to be ready to refi before the balloon; if not, they lose the property. Full amortization to maturity is rare but best for buyer certainty. Negotiate a 7-year balloon minimum and a refi-extension clause.

What's the Dodd-Frank issue?

Dodd-Frank restricts private residential seller financing — sellers can't finance more than 3 properties/year to owner-occupant buyers without a Mortgage Loan Originator license. Commercial and investor-to-investor deals are exempt. Talk to a RE attorney before a SF transaction involving a primary-residence buyer.