Intra-Family Loan Engine

Family Mortgage Bank & Amortization Calculator

Inspired by the model of parents paying off high-interest bank mortgages to "become the bank" for their children—cutting monthly burdens and recycling interest into the family estate.

Loan Architecture Adjust Parameters
$350,000
$50k $750k $1.5M
6.50%
3.0% 7.0% 11.0%
3.50%
1.0% AFR Guideline ~3.5-4.5% 9.0%
30 Years
5 Yrs 15 Yrs 30 Yrs
Tax & Legal Compliance Tip: To prevent the IRS from classifying an intra-family mortgage as a taxable gift, family interest must generally equal or exceed the applicable Federal Mid-Term or Long-Term AFR (Applicable Federal Rate) in effect when the loan is executed.
Commercial Bank
$2,212.46
Monthly payment at 6.5%
Family Bank
$1,571.66
Monthly payment at 3.5%
Child's Monthly Savings
$640.80
Extra cash flow in pocket every month
Interest Retained vs. Sunk Bank Cost Full Term Horizon

Commercial Mortgage Third-Party Bank

Principal Repaid: $350,000.00
Interest Sunk to Bank: $446,485.60
Total Outlay: $796,485.60

Family Bank Model Kept in Family

Principal Repaid: $350,000.00
Interest Paid to Parents: $215,797.60
Total Outlay: $565,797.60
Total Generational Wealth Preserved
Difference in total interest paid across full term
$230,688.00
Amortization Balance Paydown Trajectory Remaining Balance ($) vs. Loan Years
Year / Month Payment Principal Family Interest Remaining Balance Cumulative Interest
Verified Calculation Model: Fixed rate monthly amortization matching standardized Fannie Mae / Reg Z schedule formulas.
Status: Synchronized & Ready
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