What Is Prorated Rent and How Is It Calculated?
August 31, 2026Prorated rent is a partial rent charge for a partial rental period — most commonly used when a tenant moves in or out partway through a month rather than exactly on the 1st or last day. Instead of charging a full month's rent for a period the tenant only partially occupied the unit, the amount is calculated proportionally to the actual number of days.
When proration is typically used
Prorated rent commonly comes up in a few scenarios:
- • A tenant moves in mid-month rather than on the 1st
- • A tenant moves out mid-month at lease end, if the lease or local law allows partial-month billing
- • A lease starts or ends on a date other than a full month boundary as part of an agreed transition
Method 1: daily rate based on the actual days in the month
This is the most accurate method: divide the monthly rent by the actual number of days in that specific month (28, 29, 30, or 31), then multiply by the number of days the tenant will actually occupy the unit.
Example: $1,500 monthly rent, moving in on June 16 (June has 30 days, so 15 days remaining in the month). Daily rate = $1,500 ÷ 30 = $50/day. Prorated rent = $50 × 15 = $750.
Method 2: banker's method (flat 30-day divisor)
Some landlords and property managers simplify by always dividing by 30 days regardless of the actual month length, for consistency and easier math across different months. This method is slightly less precise in months with 28, 29, or 31 days but is common enough to be considered a standard, acceptable approach as long as it's applied consistently.
Using the same example: $1,500 ÷ 30 = $50/day. Prorated rent = $50 × 15 = $750 (identical here since June has exactly 30 days; the two methods diverge slightly in months with 28, 29, or 31 days).
Which method should you use?
Either is defensible as long as it's stated clearly in the lease and applied the same way every time — the actual-days method is marginally more precise, while the flat 30-day method is simpler to calculate by hand. What matters most is transparency: tell the tenant which method you use and show the math, so there's no confusion or sense of being shortchanged.
Document it in writing
Whether calculating a move-in or move-out proration, put the calculation in writing — a simple line item showing the daily rate, number of days, and total — and provide it to the tenant along with the payment request. This avoids disputes and gives both sides a clear record.
Frequently Asked Questions
Is a landlord legally required to prorate rent?
It depends on your state and lease terms — some states require proration for a partial period unless the lease specifies otherwise, while in others it's more a matter of standard practice and fairness than a strict legal requirement. Check your specific state's rules and be clear about your policy in the lease.
Do you prorate the security deposit too?
No — security deposits are typically a flat amount specified in the lease, not tied to the number of days occupied in a partial month. Proration generally applies only to the recurring rent charge.
Should I prorate the last month if a tenant moves out mid-month at lease end?
This depends on whether the tenant is ending on the exact lease end date (no proration typically needed) versus leaving early or under another arrangement — check your lease terms and applicable state law for early termination or move-out billing.
Can I round the prorated amount for simplicity?
Many landlords round to the nearest dollar for practicality, which is generally fine — just be consistent and transparent about the calculation so the tenant can verify it themselves.