Buying a home is the largest financial decision most people will ever make. These calculators walk you through every step — from figuring out what you can afford, to understanding your mortgage, to deciding whether to rent or buy at all.
How to use this guide: Work through the steps in order. Each section links to the calculator you need at that stage. Most first-time buyers spend 2–6 months from starting their search to closing — this guide covers the financial side of every step in that process.
Lenders use two ratios — your front-end DTI (housing costs as a percentage of gross income, ideally below 28%) and back-end DTI (all debts combined, must be below 43% for most conventional loans). Your credit score determines your interest rate, which has an enormous effect on how much house the same income supports. A 760+ score vs a 680 score on a $400,000 loan can mean a difference of $150–$200/month in payments and over $50,000 in total interest paid.
Down payment affects three things: your loan amount, whether you pay PMI (required below 20% down, typically 0.5–1% of the loan annually), and your interest rate. Putting down 10% vs 20% doesn't just change your loan size — it adds PMI that can cost $150–300/month until you reach 20% equity.
Closing costs typically run 2–5% of the loan amount — on a $350,000 home with 10% down ($315,000 loan), expect $6,300–$15,750 due at closing on top of your down payment. These include loan origination fees, title insurance, attorney fees, appraisal, prepaid insurance, and escrow setup. Many buyers plan for the down payment but not closing costs — and are caught short.
Ongoing costs beyond your mortgage payment: property taxes (1–2% of home value annually in most states, paid monthly into escrow), homeowner's insurance (~$100–200/month), HOA fees if applicable, and maintenance. A common rule of thumb is to budget 1–2% of the home's value annually for maintenance. On a $400,000 home, that's $4,000–$8,000/year — or $333–$667/month you should have in reserve.
Buying a home is not always the better financial decision — it depends heavily on how long you stay. Transaction costs (realtor fees, closing costs, moving) typically run 8–10% of the home's value round-trip. If you buy and sell within 2–3 years, you often need significant appreciation just to break even. The rent-vs-buy breakeven point in most markets is 3–5 years. If you expect to move sooner, renting and investing the down payment may produce better financial outcomes.
| Phase | Timeline | Key Actions |
|---|---|---|
| Preparation | 6-12 months before | Check credit, save for down payment, reduce debts, get pre-approved |
| Search | 1-3 months | Tour homes, make offers, negotiate |
| Under Contract | 30-45 days | Inspection, appraisal, final loan approval |
| Closing | 1 day | Sign documents, pay closing costs, receive keys |
| First Year | Ongoing | Build emergency fund, learn maintenance, file homestead exemption |
Shopping before getting pre-approved. A pre-approval letter tells you exactly what a lender will offer, prevents wasted time on homes outside your range, and shows sellers you are a serious buyer. Without it, your offer may not even be considered in competitive markets.
Using the maximum approved amount. Just because a lender approves you for $450,000 does not mean you should spend $450,000. Lender approval is based on the maximum you can technically repay, not the maximum you can comfortably afford while maintaining savings, retirement contributions, and quality of life.
Skipping the inspection. Waiving the home inspection to make your offer more competitive can cost tens of thousands in undiscovered problems. Foundation issues, roof damage, plumbing failures, and electrical deficiencies are expensive to fix and impossible to see in a walkthrough. The $400-$600 inspection cost is trivial compared to the risk.
Ignoring closing costs in your savings plan. Buyers who budget for a 10% down payment on a $400,000 home ($40,000) often forget the additional $8,000-$15,000 in closing costs, moving expenses, and initial home setup costs. Plan for 13-15% of the home price in total upfront cash needed.
Not comparing lenders. Mortgage rates and fees vary significantly between lenders. Getting quotes from at least 3-5 lenders can save $600-$1,200 per year in interest, according to Freddie Mac research. This applies within the same loan type — do not just accept the first rate you are offered.