How is prorated rent calculated?

Prorated rent is calculated by dividing monthly rent by a base number of days to determine a daily rate, then multiplying by the number of days the tenant occupies the property. The three common methods divide monthly rent by the exact number of days in the month (28-31), a standard 30-day commercial month, or annualized over 365 days ((Rent × 12) / 365).

Does move-in day count as a day of prorated rent?

Yes. Under standard US residential property management practices, the tenant has legal possession and access to the unit on the move-in date, so move-in day is counted as a full billable day of occupancy.

Which prorated rent method is most common in residential leases?

The Exact Days in Month method is the most widely adopted for residential leases because it reflects the true calendar days of that specific month. However, commercial leases and large corporate property management firms frequently utilize the 30-Day Banker's Rule or 365-Day Annualized formula for annual consistency.

Prorated Rent Calculator | 3-Way Comparison: Exact Days, 30-Day & Yearly 365

Understanding the 3 Prorated Rent Calculation Methods

Unless your written lease agreement specifically dictates a formula, property managers and tenants frequently debate which method to use. Each produces slightly different daily rates depending on whether the month has 28, 30, or 31 days.

Method	Daily Rate Formula	Total Rent Formula	Best Suited For
1. Exact Days in Month	Monthly Rent ÷ Days in Month (28–31)	Daily Rate × Days Occupied	Standard US residential leases
2. 30-Day Banker's Rule	Monthly Rent ÷ 30	Daily Rate × Days Occupied	Commercial leases & standardized accounting
3. 365-Day Annualized	(Monthly Rent × 12) ÷ 365	Daily Rate × Days Occupied	12-month fixed corporate management leases

Essential Rules for Prorating Rent Fairly

01. MOVE-IN DAY IS INCLUDED

Keys Handover = Possession

The day the tenant receives keys and legal access counts as a full day of tenancy. If moving in on the 15th of a 30-day month, days occupied = (30 - 15 + 1) = 16 days.

02. MOVE-OUT DAY IS INCLUDED

Until Midnight or Inspection

The move-out date is counted as an occupied day unless the lease specifically stipulates an early-morning surrender requirement.

03. CHECK THE WRITTEN LEASE FIRST

Contract Supersedes Default

If the lease defines prorated rent as "1/30th of monthly rent," that contractual clause legally controls over calendar day calculations.

04. FEBRUARY ADVANTAGE

28 vs 30 vs 31 Day Variance

In February (28 days), the daily rate is highest under the Exact Days method, whereas in 31-day months (e.g., January, March, July), Exact Days produces the lowest daily rate.

Frequently Asked Questions

When is prorated rent usually due upon moving in?

Property managers handle this in two ways: (1) Pay prorated rent on move-in day, followed by full rent on the 1st of the following month; or (2) Pay the full first month's rent upfront at signing, and apply the prorated credit to the second month.

Can a landlord refuse to prorate rent for mid-month move-outs?

Yes, if the lease agreement requires 30 days written notice ending on the last calendar day of a rental period, or if the tenant is breaking a fixed-term lease without an approved landlord agreement.