Whether you're buying your first home or exploring refinancing options, knowing your exact monthly amortization is the first step to making a smart financial decision. This guide answers the most common questions Filipino homeowners ask about home loan calculators — covering how to compute your monthly payments, what affects your amortization, and how to compare rates across BDO, BPI, Metrobank, Security Bank, PNB, RCBC, and every major bank in the Philippines.
Once you know what you're currently paying, you can quickly find out if you're overpaying. Most Filipino homeowners are on rates between 7% and 10%, while the best refinance rate available today through Nook is 5.99% p.a. — and switching costs you nothing, since Nook's service is 100% free to borrowers. Use the Q&A below to understand exactly how your home loan calculator works and what your numbers mean.
To compute your monthly home loan amortization, you need three numbers: your loan amount (principal), your annual interest rate, and your loan term in months. Most Philippine bank calculators — and Nook's free calculator — use the standard amortizing loan formula to give you a fixed monthly payment that covers both interest and principal across your entire term.
Here's a quick example: for a loan of 3,000,000 at 7% per annum over 20 years (240 months), your monthly amortization would be approximately 23,260. At 5.99% p.a. over the same term, that drops to roughly 21,470 — a difference of about 1,790 per month, or over 430,000 across the life of the loan.
The fastest way is to use an online calculator. Just enter your outstanding balance, current rate, and remaining term to instantly see your payment.
The standard formula used by all Philippine banks for a fixed-rate home loan is the Equal Monthly Installment (EMI) formula:
Monthly Payment = P × [r(1+r)^n] / [(1+r)^n − 1]
Where:
- P = Principal loan amount (e.g., 5,000,000)
- r = Monthly interest rate = Annual rate ÷ 12 (e.g., 7% ÷ 12 = 0.5833%)
- n = Total number of monthly payments (e.g., 20 years × 12 = 240)
For example, a 5,000,000 loan at 8% p.a. over 20 years:
- r = 0.08 ÷ 12 = 0.006667
- n = 240
- Monthly payment ≈ 41,822
At 5.99% p.a. instead, the same loan term gives a monthly payment of approximately 35,790 — saving you roughly 6,032 per month.
Here's a side-by-side comparison of monthly amortization for a 3,000,000 home loan over 20 years at various interest rates you might encounter across Philippine banks:
| Interest Rate | Monthly Amortization | Total Interest Paid |
|---|---|---|
| 5.99% p.a. | 21,470 | 2,152,800 |
| 7.00% p.a. | 23,260 | 2,582,400 |
| 8.00% p.a. | 25,093 | 3,022,320 |
| 9.00% p.a. | 26,992 | 3,478,080 |
| 10.00% p.a. | 28,950 | 3,948,000 |
The difference between paying 10% and 5.99% on a 3,000,000 loan is 7,480 every single month — that's over 1,795,200 in extra interest over 20 years. If your current rate is above 6%, it's worth checking whether refinancing makes sense for your situation.
Your loan term has a significant impact on your monthly payment — but a shorter term means you pay far less interest overall. Here's how the term affects a 3,000,000 loan at 7% p.a.:
| Loan Term | Monthly Payment | Total Interest |
|---|---|---|
| 10 years | 34,833 | 1,179,960 |
| 15 years | 26,953 | 1,851,540 |
| 20 years | 23,260 | 2,582,400 |
| 25 years | 21,181 | 3,354,300 |
A 25-year term gives you the lowest monthly payment, but you'd pay over 3,354,300 in interest — nearly 3x more than a 10-year term. Most Filipino borrowers choose 15–20 years to balance affordability with total cost. When refinancing, you can also choose to keep the same remaining term (to lower your monthly payment) or shorten it (to pay off faster at a lower rate).
All major Philippine banks — BDO, BPI, Metrobank, Security Bank, PNB, RCBC, UnionBank, Chinabank, PSBank, EastWest Bank, Robinsons Bank, and Pag-IBIG — use the same underlying amortization formula for fixed-rate periods. This means if you enter the same loan amount, rate, and term into any bank's calculator, you'll get the same monthly payment.
However, there are important differences between banks that a calculator alone won't show you:
- Fixed-rate periods: Some banks offer a fixed rate for 1, 2, 3, or 5 years — then your rate is repriced. The calculator only reflects the initial fixed period.
- Repricing rates: After the fixed period, your rate may jump significantly. Always ask what the repricing rate is before committing.
- Fees and charges: Processing fees, appraisal fees, and early settlement fees vary widely per bank and are not reflected in monthly payment calculators.
- Loan-to-value (LTV) ratios: Banks differ on how much of the property value they'll lend — typically 70% to 80%.
This is why comparing across banks manually is time-consuming. Nook pulls live rates from all major banks so you can compare real offers in one place for free.
A repricing period (also called a fixing period) is the length of time your interest rate is locked in at the rate agreed when you took out your loan. After this period ends, your bank will adjust your rate based on prevailing market rates — which can significantly change your monthly payment.
For example, if you took out a home loan at 5.5% fixed for 3 years, your monthly payment was calculated on that rate. After 3 years, if the bank reprices your loan to 8.5%, your new monthly payment on a remaining balance of 2,700,000 over 17 remaining years would jump from approximately 17,700 to approximately 24,900 — an increase of over 7,200 per month.
This repricing shock is one of the main reasons homeowners refinance. If your fixing period has expired or is about to expire, it's worth checking current market rates immediately — because your bank's repriced rate is rarely their best available rate.
Philippine banks and Pag-IBIG generally follow a debt-to-income (DTI) ratio guideline: your total monthly debt payments should not exceed 30% to 40% of your gross monthly income. This includes your home loan amortization plus any other existing loans (car loans, personal loans, credit card minimums).
As a practical guide:
| Gross Monthly Income | Max Recommended Amortization (30%) | Approx. Max Loan at 7% / 20 yrs |
|---|---|---|
| 50,000 | 15,000 | ~1,900,000 |
| 80,000 | 24,000 | ~3,100,000 |
| 120,000 | 36,000 | ~4,600,000 |
| 200,000 | 60,000 | ~7,700,000 |
Keep in mind: a lower interest rate increases your borrowing power. At 5.99% instead of 7%, the same monthly budget can support a loan roughly 10–12% larger — or simply give you more financial breathing room each month.
A standard monthly amortization calculator only shows your principal and interest payment. It does not include the following costs, which can be substantial:
- Processing / appraisal fee: Typically 5,000 to 10,000, paid upfront
- Mortgage registration fee: Based on loan amount, usually 0.25% to 0.50%
- Documentary stamp tax (DST): 1.5% of the loan amount on mortgaged properties
- Fire and MRI (Mortgage Redemption Insurance): Annual premiums added to your loan or paid separately, typically 0.2% to 0.5% of outstanding balance per year
- Notarial and annotation fees: Varies by location, typically 3,000 to 8,000
- Annual bank fees: Some banks charge annual service or maintenance fees
- Early settlement / prepayment penalty: If you pay off or refinance before the end of your fixing period, banks may charge 1% to 3% of the outstanding loan
When refinancing, you should factor these one-time costs against your projected monthly savings to find your break-even point. Use Nook's refinance break-even calculator to see exactly how many months it takes for your savings to outweigh the switching costs.
Comparing home loan rates across BDO, BPI, Metrobank, Security Bank, PNB, RCBC, and other Philippine banks manually is tedious — you'd need to contact each bank, wait for their offers, and then run calculations yourself. Here's a structured approach if you're doing it manually:
- Request a formal loan offer (not just a brochure rate) from each bank — ask for the all-in rate inclusive of fees for a specific loan amount and term.
- Use the same inputs across all banks: same loan amount, same term, same fixed-rate period. This makes the monthly payments directly comparable.
- Calculate the Total Cost of Borrowing (TCB): Monthly payment × number of months + all upfront fees. This gives you the true cost, not just the monthly number.
- Ask about repricing rates: The bank with the lowest fixed rate may have a much higher repricing rate. Always ask what rate applies after the fixing period.
- Compare Pag-IBIG too: For loans under 6,000,000, Pag-IBIG Fund rates are often very competitive, especially for members with long contribution histories.
The faster alternative: Nook compares live rates across all major banks in one application, at no cost to you. You submit your details once and Nook matches you with the best available offer — saving you weeks of legwork.
Yes — refinancing is one of the most effective ways to lower your monthly amortization, especially if you took out your home loan when rates were higher or your current fixing period has expired and your bank has repriced you upward.
Here's a concrete example: if you have an outstanding balance of 4,000,000 with 15 years remaining and you're currently paying 8.5% p.a., your monthly amortization is approximately 39,380. By refinancing to 5.99% p.a. over the same remaining term, your new monthly payment would be approximately 33,740 — saving you 5,640 per month or 67,680 per year.
Over 15 years, that's over 1,015,200 in savings — even after accounting for typical refinancing costs of 50,000 to 80,000.
To see your personalised savings estimate, use Nook's home loan refinance calculator — it factors in your current rate, outstanding balance, remaining term, and switching costs to give you a clear picture of how much you'd save and how quickly you'd break even. Nook's service is completely free to borrowers; the bank pays Nook's fee when your loan is approved.