Max Allowed Monthly Housing EMI
₹ 50,000
Eligible Loan Amount
₹ 66,22,430
Down Payment Contribution
₹ 15,00,000
Max House Purchase Price
₹ 81,22,430
About the House Affordability Tool
Our free House Affordability Tool helps prospective home buyers determine the maximum property price they can comfortably purchase based on their income, existing debt commitments, available down payment, and prevailing mortgage rates.
1. House Affordability Mathematical Formulas
Maximum home purchase affordability is evaluated using standard Debt-to-Income (DTI) and reverse amortization equations:
Max Total Debt Allowed = Gross Monthly Income × (FOIR Percentage / 100)
Max Allowed Housing EMI = Max Total Debt Allowed − Existing Monthly Debts
Eligible Loan Principal = [ Max Allowed Housing EMI × ((1 + r)n − 1) ] / [ r × (1 + r)n ]
Max House Purchase Price = Eligible Loan Principal + Available Down Payment
Where the defined variables are:
- Gross Monthly Income: Total monthly earnings before taxes and payroll deductions.
- FOIR Percentage: Fixed-Obligation to Income Ratio limit (typically capped at 50% by lenders).
- r: Monthly periodic interest rate ($\text{Annual Interest Rate} \div 12 \div 100$).
- n: Mortgage repayment duration expressed in months ($\text{Tenure in Years} \times 12$).
2. Practical Worked Example
Let us review a standard home affordability calculation scenario:
- Gross Monthly Income: ₹1,20,000
- Existing Monthly Debts / EMIs: ₹10,000
- Available Down Payment: ₹15,00,000 (₹15 Lakhs)
- Interest Rate: 8.5% per annum ($r = 8.5 \div 12 \div 100 \approx 0.0070833$)
- Mortgage Tenure: 20 years ($n = 240$ months)
Calculation Breakdown:
- Max Total Debt Allowed (50% FOIR) = ₹1,20,000 × 50% = ₹60,000
- Max Allowed Housing EMI = ₹60,000 − ₹10,000 = ₹50,000 per month
- Eligible Loan Principal = ₹50,000 × $[(1.0070833)^{240} - 1] / [0.0070833 \times (1.0070833)^{240}] \approx$ ₹66,22,430
- Max House Purchase Price = ₹66,22,430 + ₹15,00,000 = ₹81,22,430
Combining your eligible loan sanction with your down payment savings gives you the exact maximum budget for your home purchase!
3. Frequently Asked Questions (FAQs)
1. What is the 28/36 rule in house affordability?
The 28/36 rule suggests that a household should spend a maximum of 28% of its gross monthly income on housing expenses and no more than 36% on total debt servicing combined.
2. Does a higher down payment increase home affordability?
Yes. A larger down payment reduces the required loan principal, which lowers your monthly EMI burden and allows you to target a higher total property purchase price.
3. What additional costs should I account for when buying a house?
Beyond the purchase price, you should budget for stamp duty, registration charges, legal fees, GST (for under-construction properties), home insurance, and ongoing property maintenance.
4. How does my CIBIL credit score impact house affordability?
A strong credit score (750+) qualifies you for lower mortgage interest rates, which reduces your monthly EMI and increases the maximum loan amount lenders are willing to sanction.
5. Can I include a co-applicant's income to increase affordability?
Yes, adding an earning spouse or family member as a co-applicant combines your household incomes, substantially increasing your maximum eligible housing loan and purchase budget.
6. Is it safer to buy at the maximum calculated affordability limit?
Financial planners generally recommend buying a home slightly below your maximum affordability limit to maintain a safety buffer for emergencies, lifestyle costs, and interest rate hikes.
7. How does loan tenure affect my maximum house purchase price?
Opting for a longer mortgage tenure (e.g., 30 years instead of 20 years) lowers your monthly EMI, which increases your eligible loan principal and overall housing affordability.
4. Explore Related Financial Tools
Evaluate your home financing and mortgage commitments further with our other specialized tools:
