The number your lender quotes is usually principal and interest. That is the loan payment. It is not the cost of owning the house.
Can I Get a Mortgage on Runaway Finance splits those two ideas on purpose. Principal and interest sit on one line. Tax, insurance, PMI, HOA, and upkeep sit beside them as housing cost. Closing cash, moving, and repairs or furnishing are cash to buy — money you need before the first payment, not part of the loan.
The payment is not the house
A fixed-rate mortgage payment is the amount that retires the loan if you pay it every month for the full term. The calculator uses the standard amortization formula:
Monthly P&I = P × r × (1+r)n / ((1+r)n − 1)
P is the loan (price minus down payment). r is the annual rate divided by 12. n is the term in months. If the rate is zero, the payment is simply the loan divided by n.
On the default path the loan is $340,000. Monthly principal and interest is $2,149. The first payment is $1,842 interest and only $307 principal. Most of an early payment is the lender’s money, not equity.
Each month the model charges interest on the remaining balance, applies the scheduled principal, then any extra you entered. Extra monthly, yearly, or one-time amounts go to principal. They do not recast the required payment. When more of a year’s scheduled pay goes to principal than interest, that is the crossover year — year 20 on this path.
What sits beside P&I
Year-one housing cost is principal and interest plus tax, insurance, PMI, HOA, and upkeep, each expressed as a monthly amount. That is the number the calculator labels estimated housing cost — $3,184 on the default path, not $2,149.
| Piece | How the calculator treats it | Default / month |
|---|---|---|
| Principal + interest | Amortizing loan payment | $2,149 |
| Property tax | Annual tax ÷ 12. Grows at tax growth. | $531 |
| Home insurance | Annual premium ÷ 12. Grows at insurance growth. | $150 |
| PMI | Charged only while loan-to-value is above 80%. | $0 |
| HOA | Monthly dues × 12, then ÷ 12. Grows at HOA growth. | $0 |
| Upkeep | Repairs and replacements. Default is 1% of price. Grows with inflation. | $354 |
Add those pieces and you get housing cost. The $1,035 gap between P&I and housing cost on this path is tax, insurance, and upkeep. HOA and PMI are $0 because the default has no association and a 20% down payment.
Taxes, insurance, HOA, and upkeep grow
The loan payment stays level on a fixed rate. Ownership costs do not. Each year the calculator inflates property tax at the tax-growth rate, home insurance at the insurance-growth rate, HOA at the HOA-growth rate, and upkeep at ordinary inflation. Defaults use 2.6% for all four. Year one tax is still $6,375, insurance $1,800, and upkeep $4,250. Later years are higher.
That is why a payment that fits in year one can get tight later even if your income also inflates. Income, upkeep, and the living costs beside the house grow at inflation. Tax and insurance can grow on their own rates.
PMI is temporary. The loan is not.
Private mortgage insurance is usually charged when you put down less than 20%. The calculator turns PMI off the month loan-to-value hits 80% of the purchase price — not a later appraisal. If down payment is under 20% and PMI is left at $0, it warns you. Lenders usually charge it until that 80% line.
A 10% down path on the same $425,000 house, with $180 a month of PMI, borrows $382,500. Monthly P&I rises to $2,418. Housing cost becomes $3,633. PMI drops in year 8 on that run. Cash to buy falls to $56,000 because less cash went to the down payment — closing, moving, and repairs still sit on top.
Closing costs, repairs, and the cash to buy
Cash to buy is not the monthly payment. It is the check you write to get the keys:
Cash to buy = down payment + closing costs + moving + repairs / furnishing
On the default path that is $85,000 + $8,500 + $2,000 + $3,000 = $98,500. Closing costs are an editable estimate, not a universal percent. Moving is optional. Repairs / furnishing is optional cash after closing — paint, a water heater, a sofa — not the yearly upkeep line.
Yearly upkeep is the ongoing repair budget. The default is 1% of price ($4,250 a year, about $354 a month). That stream is inside housing cost and grows with inflation. A roof in year 12 is why that line exists.
Utilities are not a housing-cost field
Electric, gas, water, trash, and internet are real ownership costs. Can I Get a Mortgage does not give them their own box. They are not inside estimated housing cost. If you want them in the outlook, fold a monthly stand-in into the life-cost fields that sit beside the house — or raise upkeep if you treat them as part of keeping the place running. Do not assume the calculator added a utility bill you never entered.
Life still sits beside the house
Housing cost is not the whole budget. Each year the model also subtracts inflated food, school, travel, extras, dependents, and health, plus flat car and other loans until those terms end. Leftover is take-home minus housing minus life minus those loans. A surplus goes into the investment pile. A shortfall draws the pile. The pile then grows at the return you entered.
On the default path, year-one take-home is $96,000. Housing is $38,213. Life is $17,040. Car and other loans are $4,560. Leftover is $36,187. Housing is 40% of take-home; adding those loans makes 45%. Those are household shares, not a lender approval.
What you may spend owning it
Over the loan the calculator totals three buckets. Financing is principal, interest, and extras. Ownership is tax, insurance, HOA, upkeep, and PMI. Cash to buy sits outside both.
| Bucket | Default path |
|---|---|
| Purchase price | $425,000 |
| Mortgage borrowed | $340,000 |
| Total interest | $433,651 |
| Financing (P + I + extras) | $773,651 |
| Ownership costs | $554,268 |
| Housing cash outflow | $1,327,919 |
| Cash to buy | $98,500 |
| Outflow plus cash to buy | $1,426,419 |
Where the money goes on this path:
| Goes to | Amount |
|---|---|
| Principal | $340,000 |
| Interest | $433,651 |
| Property tax | $284,383 |
| Insurance | $80,296 |
| Upkeep | $189,589 |
| Cash to buy (beyond the loan) | $98,500 |
The house costs $425,000. Owning it on this path may take about $1,426,419 — purchase cash, then mortgage and housing costs over the loan. Projected ownership expenses are not part of the loan.
A 15-year compare is a different loan, not a cheaper house
The calculator can hold a second path: same house or another listing, another down payment, rate, and term. The default compare is a 15-year quote at 5.9% on the same $425,000 price. That changes the payment and the interest, not the tax bill. Use it to see which lever moves the outcome — rate, term, or cash down — instead of treating P&I as the whole story.
Run your own house
These defaults are a first-home illustration, not a quote. Your tax, insurance, HOA, PMI, and upkeep will differ by state, carrier, and the house itself. Enter them.
Can I Get a Mortgage is an educational projection. It is not a pre-approval, a rate lock, or tax advice. Lenders use their own rules. Compare the outlook with a lender before you offer.
Frequently asked questions
Is the mortgage payment the true cost of owning a home?
No. The lender quote is usually principal and interest. Can I Get a Mortgage treats estimated housing cost as P&I plus tax, insurance, PMI, HOA, and upkeep. Closing, moving, and repairs or furnishing sit in cash to buy.
Does the calculator include utilities?
No. Electric, gas, water, trash, and internet are not a housing-cost field. They are not inside estimated housing cost. Fold a stand-in into the life-cost fields, or raise upkeep, if you want them in the outlook.
What is cash to buy?
Cash to buy is down payment plus closing costs plus moving plus repairs or furnishing. It is the check you write to get the keys, not the monthly payment.
When does PMI stop?
The calculator turns PMI off the month loan-to-value hits 80% of the purchase price — not a later appraisal. Extra principal can bring that month forward. The scheduled payment is not recast.
Is Can I Get a Mortgage a lender quote?
No. It is an educational projection, not a pre-approval, a rate lock, or tax advice. Lenders use their own rules.
Sources and methodology
Worked figures were produced with Can I Get a Mortgage using the calculator’s default first-home path. Monthly P&I uses the standard amortization formula. Estimated housing cost is P&I plus tax, insurance, PMI, HOA, and upkeep. Cash to buy is down payment plus closing, moving, and repairs or furnishing. PMI turns off when loan-to-value reaches 80% of purchase price. Utilities are not a housing-cost field. Extras go to principal and do not recast the payment.
This guide is educational and is not a pre-approval, a rate lock, or tax advice. Mortgage contracts and household costs differ. Compare the outlook with a lender before you offer.
Last reviewed: September 2026