To calculate a one-time payment for purchasing a house, determine the total cost by adding the property’s purchase price, closing costs, and any additional fees. Closing costs typically include taxes, title insurance, appraisal fees, and legal charges, averaging $5,000–$15,000 in the United States. The formula is: Total One-Time Payment = Purchase Price + Closing Costs + Property Taxes (if applicable). For example, a $300,000 home with $10,000 in closing costs and $4,000 in property taxes would require a $314,000 lump sum.

This calculation ensures the buyer covers all expenses upfront, avoiding mortgage interest and monthly payments. Data from the National Association of Realtors (NAR) shows 30% of homebuyers opt for cash purchases to simplify transactions and reduce long-term costs. A 2023 report by the Federal Housing Finance Agency (FHFA) noted that cash buyers paid 5–10% above market value, reflecting demand for one-time payments. Additionally, a 2022 study by Bankrate found that 68% of homeowners cited eliminating mortgage debt as a primary benefit of cash purchases. By combining purchase price, closing costs, and taxes, buyers secure the property without relying on debt, aligning with trends of financial independence and market volatility. This approach mitigates risks like interest rate fluctuations and loan approval delays, making it a strategic choice for informed investors.