Calculateur Hypothecaire 2026

Mortgage Calculator 2026: Monthly Payment and Total Cost Breakdown

With 30-year fixed mortgage rates averaging 6.50-6.75% in early 2026, buying a home at the national median price of approximately $420,000 now costs $2,100-$2,200 per month in principal and interest alone — before property taxes, insurance, and any HOA fees. That is roughly double the payment on the same home purchased at the 2021 rate of 3.0%. This calculator computes the full PITI picture (Principal, Interest, Taxes, Insurance) at today’s rates so you can plan an accurate housing budget before contacting a lender.

How a Mortgage Payment Is Calculated

The monthly principal and interest payment is derived from the standard amortization formula:

Payment = P × [r(1+r)^n] / [(1+r)^n - 1]

Where P = loan amount (home price minus down payment), r = monthly interest rate (annual rate / 12), n = loan term in months (30 years = 360, 15 years = 180).

For a $336,000 loan (20% down on $420,000) at 6.75% over 30 years: r = 0.005625, n = 360. Monthly P&I = $2,179. Total interest over the life of the loan = $448,360.

Property taxes, homeowner’s insurance, and PMI (if down payment is under 20%) are added on top to produce the full PITI payment.

Worked Examples

Example 1 — 30-year conventional, 20% down, national median price Home price: $420,000 | Down payment: $84,000 (20%) | Loan: $336,000 | Rate: 6.75% | Term: 30 years

• Monthly P&I: $2,179 | Est. taxes + insurance: $520/mo | Total PITI: ~$2,699/mo
• Total interest over 30 years: $448,360 | Total cost of ownership: $784,360

Example 2 — FHA loan, 3.5% down, first-time buyer Home price: $340,000 | Down payment: $11,900 (3.5%) | Loan: $328,100 | Rate: 6.50% | Term: 30 years

• Monthly P&I: $2,074 | FHA MIP (annual 0.55%): $150/mo | Taxes + insurance: $425/mo
• Total PITI: ~$2,649/mo | MIP drops off after 11 years if original LTV was under 90%

Example 3 — 15-year fixed, larger down payment Home price: $480,000 | Down payment: $96,000 (20%) | Loan: $384,000 | Rate: 6.00% | Term: 15 years

• Monthly P&I: $3,240 | Taxes + insurance: $580/mo | Total PITI: ~$3,820/mo
• Total interest: $199,200 — saves $312,000 vs. a 30-year on the same loan

2026 Mortgage Rate and Payment Reference Table

When to Use This Calculator

• You are shopping for a home and want to establish a realistic monthly payment ceiling before making offers
• You need to compare the 15-year and 30-year payment difference for a specific loan amount
• You are evaluating an FHA loan vs. conventional loan and want to see the MIP impact on total monthly cost
• You want to calculate how much of each monthly payment goes to interest vs. principal in early years
• You are estimating total interest costs over the life of the loan to weigh buying points against a higher rate

Common Mistakes

1. Underestimating the full PITI. Lenders qualify you based on total housing expense, not just principal and interest. Property taxes in high-tax states (New Jersey, Illinois, Texas) routinely add $600-$1,200/mo on a $420,000 home — a number this calculator lets you model explicitly.
2. Ignoring PMI on loans under 20% down. PMI typically costs 0.5-1.5% of the loan amount annually. On a $380,000 loan that is $158-$475 per month added to your payment. It drops off automatically once you reach 80% LTV.
3. Comparing payments without factoring in the APR. Two lenders may quote 6.75%, but one charges $8,000 in origination fees (pushing the APR to 6.92%) and one charges $2,000 (APR 6.80%). The APR comparison tells the real cost story.
4. Using the 28% rule without accounting for total debt. The standard 28% housing-to-income ratio is a guideline, but lenders focus on the 43% total debt-to-income ceiling. Add your student loans, car payment, and credit card minimums to the mortgage figure before estimating how much you can afford.

The 2026 Housing Market Context

The 10-year Treasury yield — the primary benchmark for 30-year mortgage pricing — is trading near 4.3-4.6% in early 2026. The spread between the 10-year Treasury and the average 30-year mortgage rate is approximately 2.2-2.4 percentage points, slightly tighter than the 2023 peak spread of 3.0+ points as secondary market conditions have normalized. Home prices nationally are roughly 40-42% above their 2020 levels, though price appreciation has moderated to 2-4% annually. The 2026 conforming loan limit is $766,550 for single-unit properties in standard areas, and $1,149,825 in high-cost areas — loans above these limits are jumbo mortgages and typically require 10-20% down and 720+ credit scores. The FHA floor limit sits at $498,257. New single-family housing starts have improved but remain below the 1.5 million annual pace needed to close the multi-year supply deficit, keeping upward pressure on prices in most markets.

Tips for Getting the Best Mortgage Outcome

• Compare at least 3-5 lenders within a 14-day window — multiple mortgage inquiries in that period count as a single credit pull under FICO scoring rules
• A 760+ credit score versus a 680 score typically unlocks a rate that is 0.50-1.0% lower, saving $80-$170/mo on a $336,000 loan — worth addressing before applying
• Buying one discount point (1% of loan amount, or $3,360 on a $336K loan) typically reduces the rate by 0.25%, which pays off in about 4-5 years on a 30-year fixed
• Lock your rate within 3 days of receiving your best Loan Estimate; markets can move 0.125-0.25% in a single week
• Budget 2-5% of the home price for closing costs separate from the down payment — these are due at closing and are not included in the mortgage payment shown above
• First-time buyers should check state housing finance agency programs — many offer 3-4% down payment assistance grants that reduce the loan balance from day one

Related Calculations

• Refinance Calculator 2026 — determine if your existing mortgage rate is high enough to warrant refinancing
• Amortization Calculator — view the full month-by-month payment schedule and see how extra payments accelerate equity
• FHA Loan Calculator — model FHA payments with 3.5% down and the full MIP cost included
• Rent vs Buy Calculator — compare the total 7-year cost of renting against buying at current prices and rates