When you apply for a mortgage loan in the US, you will typically deal with an underwriter. Most underwriters work for banks, but you can also choose to work with a brokerage. Mortgage brokers don't provide loans directly, but have relationships with a number of lenders. Regardless of the type of underwriter you work with, you will typically be required to:
Most lenders today will want to know every detail of your financial life. If something looks odd, or doesn’t make sense they will want to have some sort of explanation. This means that you will have to write letter explaining everything. For instance they may want to know why a credit card issuers pulled your credit three months ago when you were trying to apply for store credit, or why you changed jobs a few months ago or why you have moved from job to job over the last couple years. It’s best to write them and explain everything in full detail and move on. They do this simply to verify your financial stability and it is usually something that is requested from time to time.
With this in mind, it’s important to do research before choosing a mortgage lender. You not only want to compare the rates but also the level of service each lender provides. When comparing rates, be sure to get the estimates on the same day as rates can change daily. When reviewing level of service, ask how quickly they can process your loan. Is the lender available to personally help you choose the right product and rate, or are you waiting on hold for “the next available representative”? Do they make you jump through hoops just to get a rate quote?