Should you go with a fixed rate or an adjustable rate? When talking with those planning to buy a home in Washington, DC, this is where the dilemma begins. To properly compare the two options, we first need to understand how interest rates are determined.

The first factor that influences mortgage rates is the yield on 10-year Treasury bonds. A 30-year fixed mortgage tends to move similarly to long-term Treasury yields due to its longer maturity. The second factor is the Federal Reserve's benchmark interest rate and inflation expectations. While the benchmark rate does not directly set mortgage rates, it is reflected through the cost of funding in the market.

The third factor is the supply and demand situation in the MBS market. When there is strong investment demand for mortgage-backed securities, the spread between mortgage rates and Treasury rates tends to narrow. These three factors work together to form the average rates announced each week.

Currently, the average rate for a 30-year fixed mortgage is observed to be in the mid to high 6% range. The 15-year fixed rate tends to be lower, typically in the high 5% to low 6% range.

Returning to the comparison of fixed rates and ARMs, the advantage of a fixed rate is the stability of having consistent payments throughout the loan term. In contrast, ARMs start with relatively low rates for the first few years but adjust according to benchmark rates thereafter. In areas like DC, where many people frequently change jobs, some may consider ARMs with the possibility of moving within 5 to 7 years, but if you plan to settle long-term, a fixed rate is a more stable choice.

It is also important to compare the rate differences based on credit scores.

• 760 and above: lowest rate tier
• 700-759: average rate tier
• 660-699: above average rate tier
• below 620: tendency for stricter approval conditions

DTI and down payment ratios also affect the rates offered by lenders. Increasing your down payment can lower your DTI, often giving you an advantage in negotiations.

For Korean households, it is practical to manage credit card usage rates low for at least 3 to 6 months before applying for a loan and to refrain from opening new loans or cards. In the DC area, there can be significant differences in closing costs and terms among lenders, so it is advisable to compare estimates from at least two or three lenders.