Mortgage loan calculator
Calculate your monthly mortgage payment, total interest paid, and year-by-year amortization in seconds. Enter loan amount, interest rate, term, and down payment — see results instantly. Plus, the points-and-miles strategy for credit card applications around mortgage timing: when to pause, when to resume, and how sign-up bonus value can offset closing costs.
How to use this calculator
Enter your loan details in the input fields below — home price, down payment percentage, interest rate, and loan term. The calculator instantly computes your monthly payment (principal + interest), total interest paid over the life of the loan, total cost of the mortgage, and a year-by-year amortization preview. All calculations happen in your browser — nothing is sent anywhere, your inputs stay private. Adjust any field and results update immediately.
This calculator covers the principal and interest portion of a mortgage. Real mortgage payments typically include 30-40% more for property taxes, homeowner’s insurance, and PMI (private mortgage insurance) — factor those in separately based on your specific situation. Use this calculator for the loan structure itself; consult a lender or mortgage broker for total payment estimates including escrow.
Calculate your mortgage payment
Enter loan details below — results update instantly as you adjust values
Year-by-year amortization preview
How each year’s payments split between principal and interest. Early years are interest-heavy; later years are principal-heavy.
| Year | Principal Paid | Interest Paid | Balance Remaining |
|---|
About these calculations: The calculator uses the standard mortgage amortization formula: M = P[r(1+r)^n] / [(1+r)^n − 1], where M = monthly payment, P = principal, r = monthly interest rate, and n = total number of payments. Results assume a fixed-rate mortgage with consistent monthly payments and no extra principal payments. Adjust the inputs above to model different scenarios — a 1% rate change typically affects monthly payment by ~$200-300 on a $360K loan over 30 years. A 5-year term reduction (30→25 years) cuts total interest by ~$80,000 while raising monthly payment by ~$300.
The points-and-miles strategy around mortgages
Mortgage applications and credit card strategy interact in specific, predictable ways. Three intersection points matter most: credit score impact from new card applications, sign-up bonus value as a closing cost offset, and the specific timing windows that maximize both. Understanding these helps you avoid the most common points-and-miles mistakes during home purchase:
Sign-up bonuses can offset closing costs
Closing costs on a $450K home typically run 3-6% of purchase price = $13,500-$27,000 out-of-pocket at closing. Strategic credit card sign-up bonuses earned 6-12 months before mortgage application can deliver $3,000-$8,000 in transferable points value — partially offsetting closing costs through travel awards or statement credit redemptions.
3 well-timed sign-up bonuses 12-18 months before mortgage app: Chase Sapphire Preferred (60K UR = $1,200), Capital One Venture X (75K = $1,275), Chase Ink Business Preferred (90K UR = $1,800). Total value: $4,275 in transferable points — enough to fund a $4,000+ honeymoon or post-move family trip via points instead of cash.
Pause card applications 6-12 months before applying
Each credit card application creates a hard credit pull, temporarily reducing your credit score 5-10 points per application. For mortgage applications, even small score reductions can affect your interest rate meaningfully — a 20-point drop from 760 to 740 can raise your rate by 0.125-0.25%. On a $360K loan, that’s $10,000-$20,000 in additional interest over 30 years.
$360K at 6.75% (760 credit) vs. 6.875% (740 credit): Monthly payment difference: ~$30. Total interest difference over 30 years: ~$10,800. Saving $10,800 by pausing card applications for 6-12 months is dramatically more valuable than any single sign-up bonus. Pause new applications 6-12 months before mortgage shopping; resume only after loan closes.
Don’t pay mortgage via credit card
Services like Plastiq charge 2.9% processing fees to pay mortgages with credit cards. The math rarely works: a $2,335/month mortgage payment via Plastiq incurs $68/month in fees ($816/year). Even on a 2x rewards card earning 2 transferable points per dollar, the rewards are worth $93-95 (at ~2¢ per point) — barely breaking even before considering opportunity cost.
Only during sign-up bonus minimum spend windows. Paying $2,335 via Plastiq generates $2,335 toward MSR for a card you’d otherwise miss the bonus on — fee of $68 vs. bonus value of $1,200+ is exceptional ROI. Don’t make mortgage-via-credit-card a routine practice; reserve it for occasional MSR coverage when no other path exists.
Down payment funds and credit card debt
Mortgage underwriters examine your debt-to-income ratio (DTI) closely. Carrying credit card balances above 30% of total credit limit can disqualify you from the best mortgage rates — or from approval entirely. If you’re planning to apply for a mortgage within 12 months, prioritize paying down credit card balances over chasing points-and-miles rewards on new spending.
Don’t tap savings to pay off cards if the savings are part of your down payment. Mortgage underwriters require seasoned (60-90 days in account) down payment funds. Use surplus cash flow to pay down cards, not down payment savings. Best outcome: enter mortgage application with $0 credit card balances and 60-90 day seasoned down payment funds.
Mortgage timing dos and don’ts
The 12 months before your mortgage application determine the rate you’ll qualify for and the loan you’ll be approved for. These specific actions during that window have outsized impact on mortgage outcomes:
Do these things
- Pay all credit card balances to under 10% of total credit limit (utilization ratio impact)
- Don’t close existing credit cards — closing reduces available credit and shortens credit history
- Make all payments on time — even one 30-day late payment reduces scores 60-100 points
- Save 60-90 day seasoned funds for down payment in accounts you control
- Stable employment — lenders strongly prefer applicants with 2+ years at the same employer
- Document any gift funds with gift letters and source verification
- Check credit reports at all three bureaus for errors before mortgage application
- Build relationship with a mortgage broker 3-6 months before serious shopping
Don’t do these things
- Don’t open new credit cards — hard pulls + new accounts reduce credit scores temporarily
- Don’t take out auto loans or personal loans — increases debt-to-income ratio
- Don’t make large unexplained deposits — lenders scrutinize sources of funds at application
- Don’t change jobs right before mortgage application (especially to self-employment)
- Don’t co-sign on someone else’s loan — affects your DTI calculation
- Don’t max out existing credit cards — high utilization tanks credit scores
- Don’t dispute credit report items during the mortgage process (freezes some lenders’ approval)
- Don’t sell or buy major assets that change your financial picture during underwriting
The honest takeaway on mortgages and points
Buying a home is the largest financial decision most people make. The interest rate you qualify for affects your finances for 15-30 years — vastly more than any single credit card sign-up bonus or rewards optimization. If you’re 6-12 months away from a mortgage application, points-and-miles takes second priority to mortgage preparation: pause new card applications, pay down balances, season down payment funds, and protect your credit score above all else.
Points-and-miles remains valuable, but the timing matters. Best practice: Build your card portfolio aggressively 2-5 years before your mortgage timeline, pause 12-18 months before application, close the mortgage, then resume points-and-miles strategy after closing. Sign-up bonuses earned during the buying window aren’t worth the mortgage rate impact.
The good news: after closing, your portfolio is intact, your home is purchased, and points-and-miles strategies can fund moving costs, post-move trips, and new home setup. Many of our readers fund their honeymoon, post-move family trip, or first-anniversary getaway entirely with points earned during the pre-mortgage period. The pause is temporary; the strategy resumes after closing.
Frequently asked questions
How does this calculator handle property tax and insurance?
It doesn’t — this calculator computes principal and interest only. Real monthly payments typically run 25-40% higher when property tax, homeowner’s insurance, PMI (private mortgage insurance), and HOA fees are included. Example: a $2,335 P&I payment commonly becomes $3,000-$3,300 total with escrow. For total monthly cost estimates, consult a mortgage broker who can provide a Loan Estimate document showing all components. This calculator helps you understand the loan structure; the escrow components vary too much by location to model accurately.
Is 20% down payment required to buy a home?
No. Many conventional loans accept 5% down; FHA loans accept 3.5% down; VA loans require $0 down for qualifying veterans; USDA rural loans require $0 down for qualifying areas. However, down payments below 20% typically require PMI — private mortgage insurance averaging 0.5-1.5% of the loan amount annually, paid until you reach 20% equity. PMI adds $150-450/month on a typical loan. The “20% down” advice comes from PMI avoidance and stronger initial equity position, not loan eligibility.
Should I choose a 15-year mortgage over a 30-year?
Depends on your situation. 15-year benefits: Significantly lower interest rate (typically 0.5-0.75% lower than 30-year), dramatically less total interest paid over the life of the loan, faster equity buildup. 15-year costs: Monthly payment is 50-70% higher than equivalent 30-year, limiting flexibility and reducing cash available for other investments. The math: On a $360K loan at 6.25% (15-year) vs. 6.75% (30-year), monthly payment jumps from $2,335 to $3,087 — but total interest drops from $480K to $195K, a $285K savings. Choose 15-year if your income comfortably supports the higher payment; choose 30-year for flexibility or to direct surplus toward higher-return investments.
What credit score do I need for the best mortgage rate?
760+ for conventional loans gets the best published rates. Scoring tiers (May 2026 standards): 760+ best rates; 740-759 strong rates (0.125% higher); 720-739 acceptable (0.25% higher); 700-719 limited options (0.375% higher); 680-699 marginal (0.5-0.75% higher); below 680 may require FHA loan with PMI. The economic impact of credit score is substantial: 760 vs. 720 on a $360K 30-year loan = ~$15,000-25,000 in additional interest over the life of the loan. Protect your credit score in the 12 months before mortgage application — this often exceeds the value of any credit card sign-up bonus.
Can I pay my mortgage with a credit card to earn points?
Technically yes via services like Plastiq (2.9% fees), but the math rarely works. For a $2,335 monthly mortgage payment: Plastiq fee = $68/month = $816/year. Even with a 2x rewards card earning 2 transferable points per dollar = 56,000 points/year at ~2¢ value = $1,120 in rewards. Net: $304 positive but requires significant management overhead and credit utilization. The exception: using mortgage payments to hit a sign-up bonus minimum spend requirement, where the bonus value ($1,200+) dramatically exceeds the fee cost. Don’t do this routinely; reserve it for occasional MSR coverage when other options aren’t available.
How long should I pause credit card applications before applying for a mortgage?
6-12 months minimum, ideally 12+ months. Each new credit card application: Hard pull on credit report (5-10 point temporary reduction); reduces average account age (slight permanent reduction until accounts age); raises mortgage underwriter scrutiny (“why are they opening cards right before a home purchase?”). For best mortgage outcomes: Pause new credit card applications 12 months before applying for a mortgage. Pay all existing card balances to under 10% of credit limit during this window. After mortgage closing, points-and-miles strategy can resume — sign-up bonuses earned during the pause window were always better as future opportunities than near-term applications.
What’s the points-and-miles return on closing costs vs. paying cash?
Closing costs typically can’t be paid with credit cards directly — most lenders only accept cashier’s checks, wire transfers, or certified funds. However, you can pay related expenses with credit cards: home inspections ($300-500), appraisals ($400-800), real estate attorney fees ($500-1,500), moving costs ($1,500-5,000), and post-move setup (appliances, furniture, painting). These secondary costs total $5,000-15,000 typically and can be charged to cards earning sign-up bonuses or category-bonus rewards. At 2-3¢ per point average value, this generates $300-900 in points value on real expenses. Plus, after the mortgage closes, the new home setup spending pattern often makes hitting MSR on a fresh sign-up bonus straightforward.
Should I prepay my mortgage early?
Depends on your investment alternatives and tax situation. Mathematical case for prepayment: Every dollar prepaid earns you the mortgage’s interest rate (6.75% in 2026) tax-free. Mathematical case against: S&P 500 long-term average return is ~10% — investing the same dollar in index funds historically outperforms mortgage prepayment by ~3-4% annually. For most readers: after retirement contributions are maxed and emergency fund is established, modest extra mortgage payments (10-20% above scheduled) are reasonable but full prepayment focus rarely optimal. Exception: if rates rise meaningfully above 7-8%, mortgage prepayment becomes more competitive with investing returns.