How much security deposit can I charge?

Your state law is the first and biggest factor. Some states cap the deposit at a fixed multiple of one month's rent. Others set no statutory limit and leave the number for you and the tenant to agree on. A few draw the line differently for furnished units, senior housing, or tenants with pets.

City and county rules can add another layer, especially in areas with rent regulation. Definitions matter too, since some places count last month's rent or a pet deposit toward the same total. Because caps, exemptions, and definitions differ, confirm the current rule in your state law guide and with your own attorney before you list a unit.

Within whatever your state allows, a common practice is one to two months' rent. Match the figure to real risk rather than a flat habit. A tenant with strong credit and steady income may warrant less, while pets, a thinner application, or higher turnover risk may justify more.

Weigh protection against marketability. A very high deposit shields you from damage but shrinks your applicant pool and slows leasing. Screening applicants carefully up front often protects you more than a large deposit ever will, because it lowers the odds of trouble in the first place.

• Charging above the cap. In states with a limit, going over can force you to refund the excess and may expose you to penalties or a lawsuit.
• Blurring fees and deposits. Calling a nonrefundable charge a deposit invites conflict. Label refundable deposits and nonrefundable fees clearly and separately.
• Ignoring what counts toward the cap. Some states fold pet deposits or last month's rent into the same limit, so add those amounts in before you total up.
• Skipping the move-in inspection. Without a documented starting condition, you cannot fairly justify keeping any of the deposit later.

Whatever you decide, spell out the deposit amount, what it covers, and the conditions for its return directly in the lease. A clear clause prevents most move-out arguments and gives you something concrete to point to if a dispute reaches a judge.

Pair that clause with a signed move-in condition report and photos. Together they set the baseline you will measure damage against, which is what actually determines how much of the deposit you can keep at the end.