I recently opened a checking account and gave my account number to my new boss. What will my boss need to do to be able to deposit a check into my checking account? Can someone deposit into your account with only your account number??
Assumptions: you're in the United States, you gave an account and routing number, and your boss will be making direct (i.e. electronic) deposits. In particular, I assume you're not asking whether your boss can walk up to the counter and deposit a check made out to you.
Under those assumptions, the answer is yes. Your boss can deposit your paycheck/bonus/expense reimbursement/whatever directly into your account. It is routine for employers to do so. Sometimes the employer will ask for a voided check, but not always; sometimes they just need the account and routing numbers.
Can someone deposit into your account with only your account number?
Yes. If I have a copy of your blank check or the routing and account number, I can make a deposit. Years ago, I had a tenant who always paid late, and often bounced checks. To avoid the bounce, I'd go the bank that was where he had his account. One time, he was short $5. i.e. he had $620, and the rent was $625. I handed the teller $5 and a deposit ticket, made the deposit and got my money.