Housing Loan Calculator Philippines: How to Compute Your Monthly Payment
Before you sign any loan documents, you need to know one number: your monthly amortization. This single figure determines whether a home is truly affordable for your household — and whether your bank will approve you in the first place. This guide explains exactly how Philippine housing loan calculators work, walks you through real examples using BPI, BDO, RCBC, and Security Bank rates, and shows you how to use that knowledge to find the lowest possible rate.
How Philippine Banks Calculate Your Monthly Amortization
Every housing loan calculator in the Philippines uses the same core formula. Given a principal (P), a monthly interest rate (r), and a loan term in months (n), your fixed monthly amortization (M) is:
M = P × [r(1+r)^n] ÷ [(1+r)^n − 1]
The tricky part is that Philippine home loans use fixed-rate periods, not a fixed rate for the entire term. A bank might offer you a 1-year fixed rate of 6.00% p.a., after which the rate resets to whatever the bank's prevailing rate is at that time. This means your amortization in year 2 could be very different from year 1. Always calculate for both the fixed period and a worst-case repricing scenario.
Key Variables That Affect Your Calculation
- Loan amount: Typically 70%–80% of the appraised property value. A property priced at 5,000,000 might yield a maximum loan of 3,500,000–4,000,000.
- Interest rate: Currently ranging from 6.00% to 7.00% p.a. at Nook partner banks for a 1-year fixed period.
- Loan term: Most Filipino borrowers choose 20 years (240 months), though terms from 5 to 25 years are available.
- Fixed period: 1-year, 3-year, and 5-year fixed options are common. Shorter fixed periods usually mean a lower initial rate.
Side-by-Side Calculation: BDO, BPI, Security Bank, and RCBC
Let's use a concrete example. Assume you are borrowing 3,000,000 over 20 years (240 months) on a 1-year fixed rate. Here is how the numbers break down with each Nook partner bank.
BDO Unibank — 1-Year Fixed Rate: 6.00% p.a.
Monthly rate: 6.00% ÷ 12 = 0.50% (0.005)
Monthly amortization: approximately 21,491
Total interest paid over the fixed year (12 months): approximately 175,310
Minimum monthly income required: 50,000
Typical approval time: 30 days
BPI Family Savings Bank — 1-Year Fixed Rate: 6.70% p.a.
Monthly rate: 6.70% ÷ 12 = 0.5583% (0.005583)
Monthly amortization: approximately 22,695
Total interest paid over the fixed year: approximately 196,745
Minimum monthly income required: 40,000
Typical approval time: 52 days
Note: BPI also offers a 5-year fixed option at 6.50% p.a. For a 3,000,000 loan over 20 years, this gives a monthly amortization of approximately 22,372.
Security Bank — 1-Year Fixed Rate: 6.99% p.a.
Monthly rate: 6.99% ÷ 12 = 0.5825% (0.005825)
Monthly amortization: approximately 23,198
Total interest paid over the fixed year: approximately 206,990
Minimum monthly income required: 50,000
Typical approval time: 23 days — the fastest of the four banks
Note: Security Bank also offers a 5-year fixed option at 6.75% p.a., giving a monthly amortization of approximately 22,785.
RCBC — 1-Year Fixed Rate: 7.00% p.a.
Monthly rate: 7.00% ÷ 12 = 0.5833% (0.005833)
Monthly amortization: approximately 23,259
Total interest paid over the fixed year: approximately 208,015
Minimum monthly income required: 50,000
Typical approval time: 49 days
Note: RCBC has a stricter maximum Debt-to-Income ratio of 30%, versus 40% at BDO, BPI, and Security Bank.
What That Difference Means in Pesos
The gap between BDO's 6.00% and RCBC's 7.00% on a 3,000,000 loan may look small on a rate sheet, but it translates to a difference of roughly 1,768 per month — or about 21,220 per year. Over a 5-year fixed period, that is over 106,000 in savings. This is exactly why comparing banks before you commit matters so much. For a deeper look at how these rates stack up, see our BPI vs BDO vs Security Bank rate comparison for 2026.
How to Calculate Based on Your Salary
Philippine banks use a Debt-to-Income (DTI) ratio to determine how much you can borrow. Most lenders set a maximum DTI of 40%, meaning your total monthly debt obligations — including the new home loan — cannot exceed 40% of your gross monthly income.
Step-by-Step Salary-Based Calculation
- Step 1: Determine your gross monthly income. If you earn 80,000 per month, your maximum total monthly debt is 80,000 × 40% = 32,000.
- Step 2: Subtract any existing monthly obligations (car loan, credit card minimums, personal loans). If you have an existing 5,000 monthly car loan, your available amortization budget is 32,000 − 5,000 = 27,000.
- Step 3: Work backwards using the amortization formula to find the maximum loan amount that keeps your payment at or below 27,000. At BDO's 6.00% over 20 years, a monthly payment of 27,000 corresponds to a maximum loan of approximately 3,762,000.
Quick Reference: Maximum Loan by Salary (6.00% p.a., 20-Year Term, 40% DTI)
- Monthly income 50,000 → max monthly payment 20,000 → maximum loan approximately 1,440,000
- Monthly income 75,000 → max monthly payment 30,000 → maximum loan approximately 2,160,000
- Monthly income 100,000 → max monthly payment 40,000 → maximum loan approximately 2,880,000
- Monthly income 150,000 → max monthly payment 60,000 → maximum loan approximately 4,320,000
- Monthly income 200,000 → max monthly payment 80,000 → maximum loan approximately 5,760,000
Remember: the bank will also cap your loan at a percentage of the property's appraised value (typically 70–80%), so both limits apply. Your actual approved amount will be whichever is lower.
OFW and Overseas Borrowers: Special Considerations
If you are an OFW, your income documentation requirements are different but the amortization math is identical. Banks accept allotment slips, employment contracts, and POEA-certified documents as proof of income. BDO, BPI, and RCBC all accept OFW applicants through Nook. For a full guide on the process, read our article on how OFWs can apply for a home loan in the Philippines from abroad.
Refinancing: How a Lower Rate Changes Your Calculation
If you already have a home loan at 8% or 9% p.a., refinancing can dramatically cut your monthly payment. Here is a concrete before-and-after example:
Scenario: Existing Loan at 9.00% vs. Refinanced at 6.00%
Remaining balance: 3,000,000 | Remaining term: 20 years
- Current payment at 9.00%: approximately 26,993 per month
- New payment at 6.00% (BDO): approximately 21,491 per month
- Monthly savings: approximately 5,502
- Annual savings: approximately 66,024
- 5-year savings: approximately 330,120
Nook's refinancing service is 100% free to the borrower. Nook submits your application to multiple partner banks simultaneously and negotiates the best rate on your behalf — at no cost to you.
Fixed vs. Floating Rate: Which Should You Calculate For?
When using a housing loan calculator, always run two scenarios:
- Fixed period scenario: Use the advertised fixed rate (e.g., 6.00% for year 1). This is your guaranteed payment for the fixed period.
- Post-repricing scenario: Use a conservative estimate of 9.00%–10.00% p.a. to stress-test your budget. If you can afford the payment at 10%, you are well-protected against future rate increases.
The 5-year fixed options from BPI (6.50%) and Security Bank (6.75%) offer a longer window of payment certainty, which many borrowers find valuable even though the initial rate is slightly higher than the 1-year fixed rate.
Common Mistakes When Using a Housing Loan Calculator
- Ignoring other fees: Bank processing fees, appraisal fees, mortgage registration fees, and fire insurance can add 50,000–150,000 to your upfront costs. Always factor these in.
- Using gross income instead of net: Banks assess your DTI on gross income, but your actual budget should be based on take-home pay. Make sure the monthly payment is comfortable relative to your net income.
- Forgetting about repricing: A calculator showing only the fixed-period rate can give a false sense of affordability. Always stress-test at 9% or higher.
- Not comparing across banks: A 1% rate difference on a 5,000,000 loan over 20 years can mean over 600,000 in total interest savings. Use Nook to compare all partner banks at once.
How Nook Helps You Get the Best Rate
Nook is the Philippines' first digital mortgage broker. Instead of visiting multiple bank branches, you submit one application through Nook and receive loan offers from BDO, BPI, Security Bank, RCBC, and other partner banks in parallel. The service is completely free — Nook is compensated by the banks, not by you. The best refinancing rate currently available through Nook is 5.99% p.a.
To get started, enter your property details and income information through Nook's online form. Nook's team will match you with the best available offer, handle document coordination, and guide you through approval — all without charge.
Note: All interest rates quoted in this article are subject to change. Please verify current rates with Nook or directly with the bank before making any financial decisions.