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Five short chapters that explain how a home loan really behaves — payment structure, affordability limits, refinance break-even, rent versus buy, and early payoff — each one wired to the calculator that does the math for you.
Sample payment$2,528/mo$400,000 · 6.50% · 30 years
How amortization worksRate impact explainedRefinance break-evenDebt-to-income limitsBiweekly vs monthlyPoints and feesRent versus buyConstruction drawsHow amortization worksRate impact explainedRefinance break-evenDebt-to-income limitsBiweekly vs monthlyPoints and feesRent versus buyConstruction draws
01
Chapter 01 · The payment
Every payment is two payments
Part of your money rents the lender’s capital; the rest buys the house. The split is invisible on a bank statement, and it changes every month for thirty years.
Interest is charged on the balance you still owe, so it shrinks as the balance falls.
In month one of a $400,000 loan at 6.50%, about $2,167 is interest and only $362 is principal.
By the final payment that flips: roughly $14 interest against $2,514 of principal.
Lenders do not ask how comfortable a payment feels. They compare your monthly obligations to your monthly income and stop at a threshold. Knowing that number early keeps you out of a bad negotiation.
Debt-to-income counts the new mortgage plus cards, car and student loans.
A bigger down payment lowers the loan, the payment and often the rate you are offered.
Set your ceiling before you fall in love with a listing, not after.
Bands vary by lender and product. Always confirm the current policy on the calculators.
03
Chapter 03 · Refinancing
Refinancing is a break-even question
A lower rate is only a win if you keep the loan long enough for the monthly saving to overtake the cost of switching. That crossover month is the whole decision.
Compare the payment you have with the payment on offer, then subtract.
Divide the closing cost by that monthly saving to find the break-even month.
Restarting a 30-year term can raise lifetime interest even at a lower rate.
Illustrative sample. Your own numbers belong in the refinance calculator.
04
Chapter 04 · Rent or buy
Renting is not wasted money, and buying is not free
The honest comparison is total cost over the years you actually plan to stay — rent and its increases on one side, payment plus tax, insurance, maintenance and the equity you build on the other.
Short horizons favour renting, because purchase and sale costs need time to amortize.
Longer horizons favour buying, as principal repayment quietly becomes savings.
Model both, then decide with a number instead of a mood.
Break-even horizon5 – 7 yrstypical range in the sample model
05
Chapter 05 · Paying it off
Small extra payments beat big intentions
Every extra dollar goes straight against principal, so it removes all the future interest that dollar would have carried. This is the cheapest rate cut available to you, and it needs no approval.
Adding $200 a month at 6.50% ends the loan roughly 5.6 years early and saves about $111,000.
Paying half the amount every two weeks produces thirteen monthly payments a year.
A 15-year term costs about $3,485 a month but saves roughly $282,600 in interest.
Interest is charged on the balance you still owe, and at the start that balance is at its largest. On a $400,000 loan at 6.50%, month one carries about $2,167 of interest, leaving roughly $362 to reduce the principal. As the balance falls, the interest share falls with it and principal accelerates.
About $65 a month on the illustrative loan. That sounds small, but held for 360 payments it is roughly $23,000, which is why the rate impact tool compares the monthly effect and the lifetime effect side by side.
When you will hold the loan past the break-even month. Divide total closing costs by the monthly saving: $5,600 of costs against $133 saved is roughly month 42. Move before that and you paid to save nothing.
They work the same way: more principal, sooner. Biweekly halves add up to one extra monthly payment per year automatically, while a monthly top-up lets you choose the amount. Compare both on the biweekly and extra payment calculators.
No. Every rate, chart and payment here is a clearly labelled illustrative sample chosen to explain the mechanics. Current figures and the calculators that use them are published on MortiVio.com.
The proposed housing payment plus recurring obligations such as card minimums, car finance and student loans, measured against gross monthly income. Groceries and utilities are normally excluded, which is why a “passing” ratio can still feel tight.
No. The tools open directly, run in the browser and ask for no sign-up, no email and no personal detail to return a payment, a schedule or a ratio.
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$400,000 · 30-year fixed · illustrative
