Prorated rent is a charge for part of a rental period. To check the amount, you need the monthly rent, the first and last dates covered by the charge, and the daily-rate method used. A move-in during the month often calls for this calculation. Moving out during the month does not, by itself, establish the day your rent obligation ends.
Look at your rental agreement and the written move-in or move-out terms. Confirm the date you are allowed to take possession, the regular rent due date, and the dates on the partial-month bill. If you are leaving, confirm when the tenancy ends under the agreement and any required notice. The date you hand back the keys and the end of the rent obligation may differ.
California's 2026 tenant and landlord guide explains that rental agreements set the rent amount and due date. It also discusses notice, moving out, and rent for a last partial period. Use your own documents to identify the period before doing the math.
Here is an arithmetic example, assuming the agreement uses the actual number of days in the month and the rent period starts on the day you receive possession:
Count both the first and last charged dates when they are included in the rental period. In the same 30-day June, a June 15 start would include 16 days, so the amount under this method would be $800.
Do not assume every agreement uses the same daily rate. Some calculations use the actual days in that calendar month; an agreement may specify a 30-day divisor. Ask the property manager which method applies and have them show it on the statement, including how cents are rounded.
Leaving on the 10th does not automatically mean you owe rent only through the 10th. The agreement, the type of tenancy, the notice given, and any written agreement about an earlier end date can affect the period billed. Before assuming a refund or paying less, ask the manager to identify the tenancy end date and show how it connects to the charge.
Keep the security deposit separate from the rent calculation. The California guide cautions renters against treating a security deposit as prepaid last-month rent. If the statement combines rent, a deposit, and other charges, request an itemized breakdown so each amount has a clear purpose.
A useful partial-month statement should show:
If a date or amount looks wrong, send a specific question with your agreement and the statement attached. For example: “My possession date is June 16, but this bill begins June 15. Please show the date and daily rate used.” Keep the written answer with your payment records.
If Coastline manages your home, start through the resident page and ask for the exact dates and calculation on your account. If another company manages it, contact that team through its stated resident channel. For a dispute about your tenancy end date or applicable rules, use the California guide and local tenant assistance resources for your location.
This example explains arithmetic, not a legal determination of what any renter owes. Your agreement, notice, and applicable rules control the specific charge.