Master the Mortgage Affordability on QFINHUB. Free step-by-step instructions with instant results, expert tips, and common mistakes to avoid. No signup or email required.
Understanding how to use this calculator correctly can save you time and help you make better financial decisions. Whether you're planning a major purchase, evaluating an investment, or budgeting for the future, getting accurate numbers is the first step. This guide walks you through each input field, explains what the results mean, and shows you how to avoid common pitfalls that could lead to incorrect calculations.
Fill in the input fields on the mortgage affordability. Start with the default values shown, then adjust them to match your specific situation.
Fine-tune the parameters to match your scenario. Try different values to see how changes affect your results.
Try different down payments, interest rates, and loan terms to see how your monthly payment changes. A 15-year term costs more monthly but saves thousands in interest.
The amortization table shows exactly how much goes to principal vs interest each month. This helps you understand equity building over time.
Download your results as an image or PDF to share with your real estate agent or lender. Save to your QFINHUB dashboard for future reference.
Let's walk through a practical example. Enter realistic numbers based on your situation, then adjust one variable at a time to see how it affects the outcome. For instance, try changing the interest rate by 0.5% or extending the term by 5 years — you'll immediately see how small changes can have significant financial impacts over time. Use the export feature to save or share your results with a financial advisor.
At $100,000 income ($8,333/month), the 28% rule allows ~$2,333/month for housing (PITI). With 20% down at 6.5% interest, you can afford roughly a $325,000-$375,000 home. With 5% down, this drops to ~$275,000 because of PMI and a larger loan amount.
Conventional loans accept 3-5% down, but under 20% requires PMI (~$100-200/month). FHA loans allow 3.5% down but PMI lasts the life of the loan. 20% down eliminates PMI and gives you the best rate. First-time homebuyer programs may offer down payment assistance.
A 1% rate increase (6.5% → 7.5%) reduces your buying power by ~10%. At $100K income, that's roughly $35,000 less home. This is why rate shopping with multiple lenders is critical — even 0.25% difference matters.