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Before you tour a single house, run four numbers: your real monthly payment (not just principal and interest), what a rate move does to your buying power, where PMI kicks in, and how much cash you actually need at closing. Skip this and it's easy to fall in love with a house near Lake Texoma that your pre-approval letter says you can "afford" but your monthly budget can't actually carry comfortably.
What's Your Real Monthly Payment, Not Just Principal and Interest?
The number most first-time buyers fixate on — principal and interest — is only part of the bill. Lenders and agents call the full payment PITI:
- Principal — pays down the loan balance
- Interest — the cost of borrowing
- Taxes — property taxes, which in Texoma are billed by the county and vary by school district and city
- Insurance — homeowner's insurance, plus flood insurance if the property is near the lake's floodplain
Add HOA or POA dues if the property has them (common in lake-community subdivisions), and you've got your true monthly number. Two houses with the same list price can have meaningfully different PITI once taxes and insurance are factored in — worth checking before you fall for a listing photo.
See how it works: the calculator below shows how a loan payment splits between principal and interest each month. The figures are examples only. Scroll the table to see how the balance falls over time.
How Much Does a Rate Move Actually Change Your Buying Power?
A single percentage point on your interest rate moves your payment more than most buyers expect. On a $300,000 loan, every 1% in rate is roughly $180–$200 more (or less) per month — illustrative math only, since actual payments depend on your specific rate, term and loan type. That's the difference between a buydown offer being worth taking seriously and being a rounding error. Ask your lender to show you the payment at today's rate, and at a rate half a point higher and lower, before you start touring — it reframes what "my budget" actually means in a house.
Where Does PMI Kick In, and What Does It Actually Cost?
If your down payment is under 20% on a conventional loan, expect Private Mortgage Insurance (PMI) added to your payment — typically a fraction of a percent of the loan amount per year, split into your monthly bill. FHA and USDA loans use their own mortgage insurance structures instead of PMI, with their own rules for when it drops off. None of this is a reason to avoid a smaller down payment — plenty of successful Texoma buyers put down less than 20% — but it should be in your monthly math from day one, not a surprise on your first statement.
Pre-Approved for $300,000 Doesn't Mean You Should Spend $300,000
A pre-approval letter reflects what a lender's underwriting will allow based on income, debt and credit — it is not a recommendation of what you'll be comfortable paying every month. Lenders qualify to a debt-to-income ratio; your own budget has line items a DTI calculation never sees (childcare, a boat payment, how often you'd like to go out to eat). Decide your real monthly ceiling before you tour, independent of what the letter says you qualify for.
What's Cash-to-Close, and Why Does It Surprise First-Time Buyers?
Your down payment is the headline number, but it's not the only cash you'll need the day you close. Add in closing costs (commonly a few percent of the purchase price between lender fees, title insurance and escrow setup), plus any prepaid items like the first year of homeowner's insurance. First-time buyers who budget only for the down payment are often surprised by this second number — ask your lender for a written estimate early, not the week before closing.
Run these four numbers before your first showing, and touring houses near Lake Texoma becomes a much more honest exercise. This is Part 1 of a 10-part series on what we wish every buyer knew before they started — next up: why we have to ask you to sign a buyer-broker agreement before we can show you a house.
