Most monthly payments have four parts, often shortened to PITI: principal (paying down the loan), interest, property taxes and homeowners insurance. Many lenders collect taxes and insurance into an escrow account and pay those bills for you.

HOA dues, if the home has them, are paid to the association and are separate. Mortgage insurance (PMI) may be added when your down payment is under 20%.

On a conventional loan you can generally ask your lender to cancel PMI once your balance reaches 80% of the home's original value. It should end automatically when the scheduled balance reaches 78%, as long as you're current on payments.

FHA, VA and USDA loans use different insurance or fee rules. KeyMonth estimates PMI as a percentage of the original loan and removes it when the balance reaches 80% of the price you enter.

Lenders often check two ratios. The front-end ratio is housing costs divided by gross monthly income. The back-end ratio adds all other monthly debt. A common benchmark is 28% and 36%, and some programs allow more.

Credit score, savings, job history and the loan type also matter, so treat the Afford tab as a starting point.

An EMI is a fixed monthly amount that covers interest and part of the principal. Early EMIs are mostly interest, and the share of principal grows over time.

Most bank home loans are floating-rate and linked to an external benchmark such as the RBI repo rate. When the benchmark moves, lenders reset your rate, and either your EMI or your tenure changes. Use "Rate changes after" and "New rate" to test a different rate later in the loan.

The RBI caps how much of the property value a bank can lend: up to 90% for loans up to ₹30 lakh, up to 80% for loans above ₹30 lakh and up to ₹75 lakh, and up to 75% for loans above ₹75 lakh. The rest is your down payment.

Stamp duty, registration and other charges are not counted in the loan, so you pay them separately. KeyMonth warns you when your down payment is lower than these limits allow.

Stamp duty and registration vary by state and can depend on the property value, the buyer's gender and the location. Together they are often about 5% to 8% of the price. Enter the rate for your state in Buying costs.

Also budget for the loan processing fee (often a fraction of a percent of the loan, plus GST), legal and valuation charges, society transfer fees, and GST on under-construction homes.

Under RBI rules, banks and most regulated lenders cannot charge prepayment or foreclosure fees on floating-rate home loans taken by individuals. Fixed-rate loans may still carry a fee set out in your agreement, so read the sanction letter.

Use "Extra toward principal" to see how a monthly part-payment shortens your tenure and cuts interest.

Under the old tax regime, interest on a loan for a self-occupied home may be deductible up to ₹2 lakh a year, and principal repaid may qualify for a deduction of up to ₹1.5 lakh a year, together with other eligible investments. These deductions are generally not available under the new regime.

Tax rules change, so confirm the current limits with a chartered accountant. KeyMonth shows your first-year interest and principal to help with that conversation.

Most UK mortgages have an initial fixed or discounted rate for two, three or five years. When it ends, the loan usually moves to your lender's standard variable rate unless you remortgage to a new deal. Use "Rate changes after" and "New rate" to see the payment when that happens.

With a repayment mortgage you pay off both capital and interest over the term. KeyMonth models repayment mortgages only.

Loan-to-value (LTV) is the loan as a share of the home's price. A bigger deposit means a lower LTV, and lenders usually offer better rates at lower LTV bands, for example 90%, 85%, 75% and 60%. Many lenders need at least a 5% deposit.

In England and Northern Ireland, standard buyers pay 0% on the first £125,000, 2% up to £250,000, 5% up to £925,000, 10% up to £1.5 million and 12% above that. First-time buyers pay 0% up to £300,000 and 5% from £300,000 to £500,000, with no relief above £500,000. Buyers of additional properties pay a further 5% on every band.

Scotland (LBTT) and Wales (LTT) use different rates. Choose "enter amount" under Buying costs to use your own figure. Rates change at Budgets, so check GOV.UK before you commit.

These aren't part of your mortgage, but they are part of what the home costs each month. Council tax depends on your local council and the property's band. Leasehold flats often have a service charge and ground rent, which you can enter under the monthly service charge field.

Many UK lenders offer around 4 to 4.5 times your income, and some go higher for strong applicants. They also check your spending and test whether you could afford higher rates. KeyMonth's estimate subtracts your existing debt payments from your income and applies the multiple you choose, so treat it as a starting point.

A shorter term has a higher monthly payment but usually a lower rate and far less total interest. A longer term lowers the monthly payment and keeps more cash free each month, but costs more over time.

Use the Compare tab to see both with your own numbers.

Interest is charged on your remaining balance. Any amount you pay above the scheduled payment lowers that balance sooner, so less interest builds up every month after. Confirm with your lender how extra payments are applied and whether any limits or fees apply.

Interest-only loans, product fees added to the loan, mortgage insurance on government-backed programs, escrow cushions, property tax or council tax changes, and changes to tax rules. Ask a licensed lender for their official illustration or loan estimate to see your actual costs.