Direct Deposit is mandatory for military pay. Unlike the other services, which allow members to have their pay during basic direct-deposited into any bank account, the Corps require new recruits to open up a bank account in the on-base bank or credit union to receive their pay during basic trainng. This is done during in-processing at basic. Following graduation from basic, recruits can then change their "direct deposit" to any bank account of their choosing.
During your in-processing, you will complete paperwork to begin your military pay. Military personnel are paid on the 1st and 15th of each month. If those days fall on a non-duty day, you are paid on the duty day, preceeding. Your pay is direct-deposited into your bank account.
So, when will you receive your first paycheck? Good question, and one that can’t be answered accurately. In general, if your military pay information is entered into the Finance Computer System prior to the 7th of the month, you’ll receive your first paycheck on the following 15th. If the information is entered into the Finance Computer System after the 7th of the month, but prior to the 23rd of the month, you’ll receive your first paycheck on the following 1st. However, please note that the date you fill out the paperwork during in-processing and the date the information is input into the Finance Computer System are not the same dates. A Finance Clerk is going to take the paperwork you filled out, and enter it into the Computer. However, the clerk is entering the information of hundreds of other recruits at the same time, so it may take several days before yours gets entered. I always advise people to estimate that the first paycheck won’t be deposited until a full 30 days after arrival. That way, if you’re paid before that, it’s an unexpected surprise, and if it takes the entire 30 days, it’s what you were expecting anyway.
In any case, your first paycheck will contain all the pay you have coming to you at that point. For recruits without dependents, that means base pay, only. For those with dependents, it means base pay and housing allowance. Your first paycheck will be "pro-rated" to the number of days you’ve been on active duty. For example, if you receive your first paycheck 30 days after arrival, you will receive the full-rate of the monthly basic pay in that paycheck, and (if you have dependents), the full rate for the monthly housing allowance. If, however, you receive your first paycheck two weeks after arrival, it will contain 1/2 of the monthly base pay, and 1/2 of the monthly housing allowance (for those with dependents). Of course, taxes and other deductions (such as deductions for non-issue items, such as running shoes, soap, shampoo, laundery, ect.) are taken out.