Question 1

Why does this calculator exclude property taxes and insurance?

Accepted Answer

It calculates principal-and-interest only — the loan portion of your monthly payment. Real-world PITI (principal, interest, taxes, insurance) typically adds 15-25% on top. Treat the result as the upper bound and trim accordingly when budgeting.

Question 2

What's a healthy DTI ratio to target?

Accepted Answer

Lenders prefer DTI under 36%, but the strongest applicants land below 28%. A lower DTI gives you negotiating room on rates and protects you against rate hikes if you're on an ARM.

Question 3

Should I borrow up to my maximum?

Accepted Answer

No — the maximum represents the lender's risk ceiling, not your comfort zone. Most financial planners suggest staying 10-20% below the max so you have margin for repairs, life events, and savings.

Question 4

Does down payment affect the affordability ceiling?

Accepted Answer

Yes. A larger down payment doesn't change your DTI-driven maximum loan amount, but it directly increases your maximum home price (max loan + down payment). It also lowers monthly payments and may eliminate PMI.

Question 5

What counts as a monthly debt for this calculator?

Accepted Answer

Include all recurring minimum payments: auto loans, student loans, credit card minimums, personal loan EMIs, child support, and alimony. Do not include utilities, groceries, subscriptions, or debts that will be paid off before closing. When in doubt, include it — lenders do.

Question 6

Does this calculator work outside the United States?

Accepted Answer

Yes. The 28/36 DTI framework is the standard used by most Western lenders. While specific thresholds vary by country and lender — UK lenders often use a 4.5× income multiple instead of DTI, and UAE lenders cap at 50% DBR — the calculator gives a reliable affordability estimate in any currency. Adjust the DTI interpretation for your local market.

Question 7

What is PMI and when do I have to pay it?

Accepted Answer

Private Mortgage Insurance (PMI) is required by most US lenders when your down payment is less than 20% of the home price (LTV above 80%). It typically costs 0.5–1.5% of the loan amount per year. It is not included in this calculator — factor it into your monthly budget if your down payment is below 20%.

Question 8

Is the mortgage affordability calculator free?

Accepted Answer

Yes. CalcTools AI's Mortgage Affordability Calculator is completely free with no registration required. You can run unlimited scenarios, get an AI-powered insight on your DTI profile, and download a PDF report at no cost.

Mortgage Affordability Calculator for 400,000 Salary, 30-Year Mortgage

400,000 Salary, 30-Year Mortgage

Mortgage Affordability Calculator for 400,000 Salary, 30-Year Mortgage

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