Equal Payment vs. Equal Principal: Which Loan Repayment Is Better?
- •Equal payment = the same total every month, start to finish
- •Equal principal = pay more early, less over time, less total interest
- •Want steady payments? Equal payment. Want to save interest? Equal principal
What are the two methods?
With the equal-payment (annuity) method, your total monthly payment of principal plus interest stays the same from start to finish. Early on more of it is interest; later more is principal. Steady payments make budgeting easy.
With the equal-principal method, you repay the principal in equal parts and add interest on the remaining balance. So payments start highest and shrink over time. Because principal falls faster, total interest ends up a bit lower than equal payment.
Side-by-side comparison
| Aspect | Equal payment | Equal principal |
|---|---|---|
| Monthly payment | Same throughout | High early, then falls |
| Early burden | Lower | Higher |
| Total interest | Slightly more | Slightly less |
Say you borrow $100,000 at 5% for 30 years. Equal payment is about $537 a month with roughly $93,000 total interest. Equal principal starts around $694 in month one and falls, with about $75,000 total interest. Equal principal saves roughly $18,000 in interest, but the early burden is heavier.
Which should you choose?
- Want steady monthly spending → equal payment
- Have room to pay more early and want to save interest → equal principal
- Plan to prepay a lump sum later → equal principal often wins as principal falls faster
The rate type matters as much as the repayment method. If rates look set to rise, a fixed rate is safer; if they look set to fall, a variable rate can win. Weigh the method and the rate together to judge the total cost.
Frequently Asked Questions
Is equal principal always better for total interest?
Equal principal does have lower total interest. But its early payments are larger, so if your cash flow is tight now, equal payment can be safer.
What happens to interest if I extend the term?
A longer term lowers your monthly payment but stretches the interest period, so total interest rises. Balance the monthly burden against total interest.
For prepayment, which method wins?
If you plan to prepay, equal principal often saves a bit more interest because the balance falls faster. Just check the prepayment fees for your specific loan.
Do the numbers match a real loan?
The math matches how banks calculate, but real loans can differ slightly due to fees, prepayment, or preferential rates, so treat it as a guide.
How do I choose variable vs fixed rate?
If rates look set to rise, fixed is safer; if they look set to fall, variable can win. It is decided in the loan terms, separately from the repayment method.