If you've gone to court and gotten a money judgement against someone (called the judgment debtor), and that person doesn't pay up, you can use various methods to collect the money. One of those methods is to take money from the judgment debtor's deposit accounts -- savings, checking, money market, and mutual fund accounts in banks, savings and loans, or credit unions. This is called garnishing or levying the account. If you have information about the judgment debtor's account, this is one of the easiest methods of collecting what the judgment debtor owes you.
To seize the money in a bank account or the contents of a safe deposit box, you need the name of the bank, the branch, the exact name on the account, and the account number. Sometimes you can get the job done without the account number, but your chances of collecting are better if you have it.
You can easily find the debtor's bank and account number if you have a copy of a check written by the debtor, which may be the case if you had a business relationship. You may also have this information on a credit application or other form the debtor completed.
If the debtor is an individual, not a business, some of the money in a deposit account may be "exempt" -- protected from creditors. If you try to levy on an account containing exempt cash, in most instances it is up to the debtor to object in court and prove that the money came from an exempt source. But few debtors file such a claim. Even if the debtor does, it's possible that the debtor has some exempt money but mixes it with non-exempt money (called comingling funds) and cannot prove that the money came from the exempt source.
The following is a list of sources that the debtor may claim as exempt in most states. The debtor can exempt these monies only if they are held in personal -- not business -- accounts.
In some instances, the onus is on the bank to protect exempt funds from levy. This is true if the judgment debtor receives protected federal benefits (like Social Security, Supplemental Security Income, veterans benefits, and a few more) via electronic deposit. The bank cannot freeze any of those funds deposited within two months of the bank levy order. To learn more, see Nolo's blog Protection From Garnishment for Social Security, Veterans Benefits.
For other ways to collect money from judgment debtors, see Collecting a Judgment.
If you have a judgment against one spouse, but not the other, and the married couple owns a joint bank account, whether you can levy all of the money in the account, only one half of the money in the account, or none of the money in the account depends on state law. To learn the rules, see Bank Levies on Joint Accounts (Spouse). The same goes for joint accounts owned by non-spouses. To learn the rules, see Bank Levies on Joint Accounts (Nonspouse)
For a complete guide to collecting your money after winning a judgment, get Everybody's Guide to Small Claims Court, by Ralph Warner (Nolo).