Mortgage Guides & Explainers
Plain-English guides that pair with our calculators, written and reviewed by our editorial team using public guidance from the CFPB, Fannie Mae, Freddie Mac, HUD/FHA, and the IRS. Each section explains one part of the mortgage in clear language and links to the free tool that puts the numbers to work.
The mortgage process, step by step
Buying with a mortgage follows a predictable path, and knowing it removes most of the stress. It runs roughly: (1) check your credit and budget; (2) get pre-approved so you know your price range and can make credible offers; (3) shop and make an offer; (4) sign a purchase contract and open escrow; (5) the lender orders an appraisal and underwrites your file while you finalize insurance; and (6) you sign at closing and get the keys. From accepted offer to closing typically takes 30 to 45 days.
The single most valuable step is the pre-approval, because it converts a vague budget into a real number a seller will trust. Start by sizing a comfortable payment with the main mortgage calculator, confirm the borrowing limit with the pre-approval tool, and check that your debt-to-income ratio sits inside lender limits. Do those three things first and the rest of the process is mostly paperwork.
Understanding your monthly payment (PITI)
A mortgage payment has four parts, together called PITI: principal, interest, taxes and insurance. Principal repays the amount you borrowed; interest is the lender's charge on the balance; property taxes and homeowners insurance are collected monthly into an escrow account and paid on your behalf. On loans with less than 20% equity, a fifth item, mortgage insurance, rides along until you reach that threshold, and condos or planned communities add HOA dues.
Why it matters: a payment quoted as "principal and interest only" can understate the true monthly cost by hundreds of dollars once taxes and insurance are added. Every calculator on this site totals the full PITI so you see the real number, and most show a complete amortization schedule, the month-by-month split of principal and interest that reveals how slowly the balance falls in the early years and how much total interest a loan really costs.
Loan types explained
Most buyers choose among a handful of loan programs, each with a niche:
- Conventional — the standard loan backed by Fannie Mae or Freddie Mac; best pricing with good credit and 5%+ down, and PMI drops off at 20% equity.
- FHA — insured by the Federal Housing Administration; 3.5% down with flexible credit, useful for first-time and credit-building buyers, but it carries mortgage insurance for most of the loan's life.
- VA — for eligible veterans and service members; zero down, no monthly mortgage insurance, and competitive rates.
- USDA — for eligible rural and many suburban buyers; zero down under income limits.
- Jumbo — for loans above the conforming limit; stricter credit, down payment and reserve requirements.
The right choice depends on your down payment, credit and how long you will stay. Model each with the matching calculator, a headline-low rate on one program can lose to another once mortgage insurance or a shorter fixed period is counted.
Rates, terms and discount points
Two levers shape the cost of any loan: the interest rate and the term. A shorter term, like 15 years, carries a higher monthly payment but far less total interest than a 30-year loan; a longer term lowers the payment but costs more over time. A fixed rate stays level for the whole term, while an adjustable-rate mortgage (ARM) starts lower for an intro period, then adjusts, use our ARM calculator to weigh the low intro payment against a worst-case adjusted payment.
When you get a quote, you may be offered discount points, an upfront fee (one point equals 1% of the loan) that buys down your rate. Points pay off only if you keep the loan past the break-even point, usually several years out. Run the payment at both the with-points and no-points rate, and compare it against how long you actually plan to stay.
Down payment, PMI and closing costs
Your down payment sets your loan size and whether you pay mortgage insurance. Below 20% down on a conventional loan means paying PMI until you reach 20% equity; FHA loans carry their own premium. Beyond the down payment, budget closing costs of roughly 2% to 5% of the loan for lender fees, title insurance, appraisal and prepaid taxes and insurance, plus any transfer tax, which varies widely by state.
A larger down payment lowers your payment and total interest and can remove PMI, but a smaller one gets you into a home sooner. Many buyers bridge the gap with state down-payment assistance programs; every state runs one. See how location changes the math on our state calculators, and test different down payments in the main calculator to find your balance.
Credit and DTI: getting approved
Two numbers dominate a lender's decision: your credit score and your debt-to-income (DTI) ratio. Your score sets your rate tier, moving from the mid-600s into the 740s can drop you a full tier and save tens of thousands over the life of the loan. Your DTI, total monthly debt payments divided by gross income, tells the lender whether you can carry the new payment; most look for a back-end DTI at or below 43%, though automated approvals sometimes allow more.
Before applying, pull your credit and fix errors, pay down revolving balances, and avoid opening new accounts. Then check where you stand with our DTI calculator and estimate your ceiling with the pre-approval calculator. A few weeks of preparation is one of the highest-return things you can do in the whole process.
Refinancing explained
Refinancing replaces your current mortgage with a new one, usually to lower the rate or payment, shorten the term, or switch from an adjustable to a fixed rate. Because a refinance has its own closing costs, the key question is the break-even point: how many months of payment savings it takes to recoup those costs. If you will stay past break-even, refinancing pays off; if not, it may not.
Our refinance calculator shows the new payment, the monthly savings and the break-even month side by side. If you have a low rate you do not want to lose but want a lower payment, consider a recast instead, a lump-sum payment plus re-amortization that lowers the payment while keeping your existing rate.
Tapping your home equity
As you pay down your loan and your home appreciates, you build equity you can borrow against. Three tools compare the options. A home equity loan gives you a fixed-rate lump sum with predictable payments. A HELOC is a revolving line you draw from as needed, typically with an interest-only draw period followed by full repayment. A cash-out refinance replaces your entire mortgage with a larger one and hands you the difference.
The best choice depends on how much you need, whether you want a fixed or variable rate, and your current mortgage rate, if it is low, a cash-out refinance may not be worth giving it up, making a second loan or line the better path. Model all three to see the true cost of each before borrowing against your home.
Property taxes, insurance and escrow
Property taxes and homeowners insurance are the two big "hidden" additions to a mortgage payment, and they are set by where you buy, not by your lender. They are collected monthly into an escrow account and paid when due. Once a year the servicer runs an escrow analysis; if your taxes or premium rose, the escrow portion of your payment goes up to cover the shortfall, which is why a fixed-rate payment can still change over time.
Because these vary so much by location, a national estimate can be well off. Our state calculators build in local property-tax rates, and every calculator lets you enter a real insurance quote, so your estimate reflects the full cost of owning in your specific market rather than an optimistic guess.
First-time buyer guide
If you are buying your first home, a simple sequence keeps you in control: (1) check your credit and trim high-interest debt to improve your DTI; (2) estimate a comfortable payment, taxes and insurance included; (3) explore first-time-buyer and down-payment-assistance programs, which every state offers; (4) get pre-approved so you shop with a real budget; and (5) compare loan types before you lock a rate.
First-time buyers often qualify for more help than they expect, including lower down payments, assistance grants and reduced transfer-tax rates, so it is worth checking eligibility even if you assume you earn too much. Work through the steps in order using the linked calculators, and the payment you plan for is the one you actually get.
How much home can you afford?
Affordability is not the maximum a lender will approve, it is the payment you can comfortably carry while still saving and living your life. A common guideline keeps your total housing payment near 28% of gross monthly income and all debt payments under about 36% to 43%. But those are ceilings, not targets; a payment that leaves room for retirement contributions, an emergency fund and maintenance is far safer than one that maxes out the ratio.
Work it out from both directions. Use the pre-approval calculator to see the maximum a lender would likely offer, then use the main mortgage calculator to price a home you would actually be comfortable paying for, including local taxes and insurance. If the two numbers are far apart, trust the comfortable one, and remember that homeownership adds costs a rent payment never did, from repairs to higher utility bills.
Avoiding common mortgage mistakes
A few avoidable errors cost buyers the most. The biggest is budgeting on principal and interest alone and being blindsided by the tax and insurance escrow. Close behind is shopping without a pre-approval, which weakens your offers and wastes time on homes outside your range. Others include chasing the lowest advertised rate without checking whether it is loaded with points and fees, and skipping quotes from multiple lenders, rates and closing costs vary more than most people expect.
One mistake happens after you are approved: opening new credit or making a large purchase between pre-approval and closing, which can change your DTI and derail the loan. Underwriters re-check your file before closing, so keep your finances steady. Every one of these is preventable by planning with real numbers up front, which is exactly what the calculators here are for.
Mortgage glossary
- Amortization — the schedule by which a loan is paid off, with each payment split between principal and interest.
- APR — the annual percentage rate, which folds certain fees into the rate for comparison.
- Conforming loan — a loan at or under the limit set by the FHFA, eligible for Fannie Mae or Freddie Mac.
- Escrow — an account the servicer uses to collect and pay your property taxes and insurance.
- LTV — loan-to-value, the loan amount divided by the home's value; under 80% avoids PMI.
- PMI — private mortgage insurance, required on conventional loans with less than 20% down.
- Points — an upfront fee that buys down the interest rate, one point equals 1% of the loan.
- Underwriting — the lender's review of your income, assets, credit and the property before approval.
Frequently Asked Questions
What credit score do I need to buy a home?
It depends on the loan. Conventional loans generally want a score around 620 or higher, FHA loans can go as low as 580 with 3.5% down (and 500-579 with 10% down), and VA and USDA lenders often look for the low 600s. A higher score earns a lower rate, so it pays to check and improve your credit before you apply.
How much should I put down on a house?
Twenty percent down avoids private mortgage insurance on a conventional loan, but it is not required, conventional loans go as low as 3%, FHA needs 3.5%, and VA and USDA can be zero down for eligible buyers. A larger down payment lowers your loan, payment and interest, while a smaller one gets you in sooner; model both with our calculators.
What is PITI?
PITI stands for principal, interest, taxes and insurance, the four parts of a full mortgage payment. Principal and interest repay the loan, while taxes (property tax) and insurance (homeowners insurance) are collected monthly into an escrow account. A payment quoted as principal and interest only can be far below the true cost, which is why our calculators total all four.
When does refinancing make sense?
Refinancing usually makes sense when a new rate lowers your payment enough to recoup the closing costs within a few years (the break-even point), or when you want to shorten your term or switch from an adjustable to a fixed rate. Run your numbers through the refinance calculator to see the break-even before you commit.
What is the difference between a HELOC and a home equity loan?
A home equity loan gives you a lump sum at a fixed rate with predictable payments, while a HELOC is a revolving line of credit you draw from as needed, usually at a variable rate with an interest-only draw period followed by repayment. A cash-out refinance is a third option that replaces your whole mortgage. Compare all three with our equity calculators.
Are these guides a substitute for professional advice?
No. Our guides and calculators are educational and use public guidance from the CFPB, Fannie Mae, Freddie Mac, HUD/FHA and the IRS, but they are not financial, lending, tax or legal advice. Your actual rate, approval and terms come from a licensed lender who reviews your full situation.