Quick answer: Estimate how much cash reserve to keep after down payment and closing costs.
What this means
A home purchase can create repair and cash-flow surprises.
Buyers should think about reserves after closing, not only the cash needed to close.
Key takeaways
- Use the all-in monthly cost, not only principal and interest.
- Check leftover cash after debts and living expenses.
- Verify lender, tax, insurance, and HOA numbers before purchase.
Formula or planning rule
True monthly cost = P&I + taxes + insurance + PMI + HOA + utilities + maintenance reserve
Common mistakes
- Ignoring utility increases after moving.
- Using lender approval as the same thing as comfort.
- Spending cash-to-close without preserving reserves.
- Forgetting HOA, PMI, or reassessment risk.
How to use this site
Run the calculator with your expected purchase price, down payment, rate, taxes, insurance, utilities, maintenance reserve, debts, and living expenses. Save the scenario link and compare multiple purchase prices before making an offer.
FAQ
Is emergency fund included in the calculator?
Yes. The calculator is designed to include emergency fund as part of a more realistic mortgage affordability estimate.
Does this replace a lender estimate?
No. It is an educational planning tool. Confirm loan, tax, insurance, and legal details with qualified professionals.
Why use leftover cash?
Leftover cash helps show whether the payment is workable after the mortgage, ownership costs, debts, and normal monthly expenses.