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Monthly Payment = P × r(1+r)ⁿ / ((1+r)ⁿ−1), where P = principal, r = monthly interest rate (annual ÷ 12), n = number of payments. For a $250,000 mortgage at 6.5% for 30 years: monthly payment ≈ $1,580.

A common guideline is the 28/36 rule: spend no more than 28% of gross monthly income on housing costs and no more than 36% on all debt payments. For a $6,000/month salary, max mortgage payment would be $1,680.

Paying even $100 extra per month on a 30-year mortgage can reduce the loan term by 4–5 years and save tens of thousands in interest. The savings are greatest in the early years. Check if your lender charges a prepayment penalty first.

An amortization schedule shows each monthly payment broken down into the principal portion and interest portion, along with the remaining balance. In the early years, most of your payment goes toward interest; gradually more goes toward principal.

A fixed rate stays the same for the entire loan term, giving you predictable payments. A variable rate changes with market rates — it can go down (saving money) or up (increasing payments), making it less predictable.

Principal-only repayment pays the same principal each month — payments start high and decrease. Amortizing repayment (PMT formula) keeps the same total payment each month, making it easier to budget. Principal-only results in less total interest paid.

They vary widely by lender and country. Many US mortgages carry no prepayment penalty at all thanks to consumer-protection rules, while other lenders charge 0.5–2% of the remaining balance, often waived a few years into the loan. Always check your loan agreement before making extra payments.

For a $300,000 loan over 30 years: at 5% the monthly payment is about $1,610; at 4.5% it is about $1,520 — roughly $90 less per month. Over 30 years that compounds to more than $32,000 in interest savings.