Prorated Rent Calculator

Prorated rent is a partial month’s rent charged when a tenant moves in or out on a day other than the first or last of the month. Instead of paying the full monthly amount, the tenant pays only for the days they actually occupy the unit.

For example, if a tenant moves into a $1,500/month apartment on March 15th, they don’t owe the full $1,500 for March. They owe rent for the 17 remaining days (March 15–31), which works out to about $823 using the actual-days method.

Prorating rent is standard practice in residential leasing and is typically written into the lease agreement. It protects both landlords and tenants by ensuring rent accurately reflects the time the unit is occupied.

There are two common methods for calculating prorated rent. Both are widely accepted — the key is to use whichever method is specified in your lease agreement.

Mid-month move-in. The most common scenario. A tenant signs a lease starting on the 10th or 15th and pays prorated rent for the remainder of that month, then full rent starting the first of the following month.

Mid-month move-out. When a tenant’s lease ends on a day other than the last of the month, they pay prorated rent for the days they occupied the unit. This is typical when leases end mid-month or when a tenant gives notice to vacate early.

Lease break or early termination. If a tenant breaks their lease and vacates mid-month, prorated rent may apply depending on the lease terms and state law. Some leases require the tenant to pay the full remaining month regardless.

Month-to-month transitions. When a lease converts to month-to-month and the tenant eventually gives 30-day notice, the final month is often prorated based on when the notice period ends.

No federal law requires landlords to prorate rent, and most states leave it to the lease agreement. However, prorating is considered standard practice across the industry and is expected by tenants.

A few states have specific rules about prorating in certain situations — for example, some require prorating when a landlord terminates a tenancy mid-month. California, for instance, prohibits charging more than a prorated amount for the first month if the tenant moves in after the first.

Best practice: Always include a proration clause in your lease agreement that specifies which method you use (actual days or 30-day). This prevents disputes and sets clear expectations for both parties.

Start leases on the 1st when possible. The simplest way to avoid proration altogether. If a tenant wants to move in mid-month, you can still collect prorated rent for the partial month and set the lease to officially begin on the 1st of the following month.

Document the method in your lease. Specify whether you use the actual-days or 30-day method. This one sentence prevents arguments at move-in and move-out.

Collect prorated rent before move-in. Require the prorated amount (plus security deposit) before handing over keys. Don’t let a tenant move in with a promise to pay the prorated portion later.

Track everything. Keep records of prorated calculations, payment dates, and receipts. Tools like Vantric help landlords track rent payments, partial months, and tenant move-in/move-out dates in one place.