Understanding Total Loan Cost with Fees
The Amortized Loan Cost Calculator shows the full cost of borrowing by combining principal, interest, and fees into a single total. Enter your loan details to see the periodic payment, total interest, fee impact, and a complete yearly amortization schedule.
The Insights panel breaks down the first payment into principal and interest, identifies the crossover year when principal starts exceeding interest, and quantifies how fees affect your total cost.
How the Calculator Works
The periodic P&I payment uses the standard amortization formula:
Payment = P x [i(1 + i)^n] / [(1 + i)^n - 1]
Where P is the loan amount, i is the periodic interest rate (annual rate / payment frequency), and n is the total number of payments (years x frequency).
Fees are tracked separately — the origination fee is a one-time upfront cost, and annual fees accumulate over the loan term. Total loan cost = total P&I payments + origination fee + (annual fee x years).
Worked Example: $100,000 Loan at 5% Over 30 Years
A borrower takes out a $100,000 loan at 5% annual interest, 30-year term, with a $1,000 origination fee and $50 annual fee, paying monthly.
Setup:
- Monthly rate: 5% / 12 = 0.4167%
- Monthly payment: $536.82 (P&I only)
- First payment: $416.67 interest + $120.15 principal
Summary:
- Total Loan Cost: $195,755.78 ($100,000 principal + $93,255.78 interest + $2,500 fees)
- Total Interest Paid: $93,255.78 (93.3% of principal)
- Total Fees: $2,500 ($1,000 origination + $50/yr x 30 years)
- Extra Cost Ratio: 95.8% — you pay $0.96 in extras for every $1 borrowed
- Crossover Year: Year 17 — principal exceeds interest in annual payments
How Fees Affect Total Loan Cost
Fees are a fixed cost layered on top of interest. Here's how different fee structures change the total cost on a $100,000 loan at 5% over 30 years:
| Origination Fee | Annual Fee | Total Fees | Total Loan Cost | Extra Cost Ratio |
|---|---|---|---|---|
| $0 | $0 | $0 | $193,255.78 | 93.3% |
| $1,000 | $0 | $1,000 | $194,255.78 | 94.3% |
| $1,000 | $50 | $2,500 | $195,755.78 | 95.8% |
| $2,000 | $100 | $5,000 | $198,255.78 | 98.3% |
| $3,000 | $150 | $7,500 | $200,755.78 | 100.8% |
At $3,000/$150, the extra cost ratio crosses 100% — you pay more in interest and fees than the original loan amount. Fees add $0 to $7,500 in this range, but the interest rate drives the bulk of the cost.
The First Payment Split and Crossover Year
In a standard amortizing loan, early payments are interest-heavy and shift toward principal over time:
- Year 1: $1,475 principal / $4,966 interest (22.9% principal)
- Year 10: $2,312 principal / $4,130 interest (35.9% principal)
- Year 17: $3,278 principal / $3,164 interest — crossover year
- Year 25: $4,886 principal / $1,556 interest (75.9% principal)
- Year 30: $6,271 principal / $171 interest (97.3% principal)
The crossover year matters because before it, most of your payment services interest rather than building equity. Shorter loan terms have earlier crossover years — a 15-year loan at 5% crosses over around year 6.