Prorated rent is a partial month’s rent calculated for the days a tenant is responsible for the property.
The basic calculation is:
Daily rent × billable days = prorated rent
The important part is deciding how to calculate the daily rent and which days count. Your lease, local law, or established policy may control that choice. Once you know the method, use TenantHub’s free prorated-rent calculator to compare the result and download a worksheet.
When landlords prorate rent
Common situations include:
- A lease starts after the first day of the month
- A tenant receives possession before the regular lease start
- A fixed-term lease ends before the last day of a month
- The landlord and tenant agree to an early move-out date
- A credit reduces the days for which rent is charged
Do not assume that moving possessions out early automatically changes the tenant’s legal rent responsibility. The lease, possession date, keys, termination agreement, and local law may matter.
Method 1: Actual days in the month
Divide the monthly rent by the number of calendar days in that month.
Monthly rent ÷ days in month × billable days
Example:
- Monthly rent: $2,100
- Month: September, with 30 days
- Move-in date: September 16
- Billable days, counting September 16 through September 30: 15
Calculation:
$2,100 ÷ 30 = $70 per day
$70 × 15 = $1,050 prorated rent
This method changes slightly from one month to another because February, a 31-day month, and a 30-day month produce different daily rates.
Method 2: A 30-day month
This convention treats every month as 30 days.
Monthly rent ÷ 30 × billable days
For $2,100 in September and 15 billable days, the result is still $1,050. But in a 31-day month it will differ from the actual-days method.
Example for an August 20 move-in:
- Monthly rent: $2,100
- Billable days: 12 if August 20 through August 31 are counted
$2,100 ÷ 30 = $70 per day
$70 × 12 = $840
Using actual August days would produce:
$2,100 ÷ 31 = $67.7419 per day
$67.7419 × 12 = $812.90 after rounding
That $27.10 difference is why the method should be agreed upon before money is due.
Method 3: Annualized daily rent
Multiply the monthly rent by 12, then divide by 365. Use 366 if your agreement specifically uses the actual number of days in a leap year.
Monthly rent × 12 ÷ 365 × billable days
For $2,100 and 12 billable days:
$2,100 × 12 = $25,200 annual rent
$25,200 ÷ 365 = $69.0411 per day
$69.0411 × 12 = $828.49 after rounding
This method keeps the daily rate consistent throughout the year, apart from leap-year treatment.
Which proration method should you use?
Use the method required by the lease and applicable law. If neither dictates one, choose a method, disclose it before signing or amending the agreement, and use it consistently.
| Method | Advantage | Tradeoff |
|---|---|---|
| Actual days | Matches the calendar month | Daily rate changes by month |
| 30-day month | Simple and predictable | Can differ from the real calendar |
| Annualized | Consistent daily rate | Formula is less intuitive |
The goal is not to pick whichever formula produces the most favorable result after the fact. The goal is to have a repeatable rule both sides can verify.
How to count billable days
Write down the first and last billable date, then state whether both are included.
For a move-in, the possession date is commonly counted because the tenant can use the property that day. For a move-out, the treatment of the final day may depend on when possession is returned and what the agreement says.
Example:
Prorated rent covers August 20 through August 31, inclusive: 12 calendar days.
That sentence removes more confusion than a total by itself.
How to round prorated rent
Keep several decimal places in the daily rate and round the final total to the nearest cent. Rounding the daily rate first can create a small difference.
For example:
- Precise daily rate: $2,100 ÷ 31 = $67.741935…
- Precise total for 12 days: $812.90322…
- Final charge: $812.90
Record the method and unrounded formula on the worksheet so the calculation can be recreated later.
What to give the tenant
Provide a short written breakdown:
Monthly rent: $2,100
Proration method: Actual calendar days
Billable period: August 20–31, inclusive
Calculation: $2,100 ÷ 31 × 12
Prorated rent: $812.90
Due date: August 20
When the tenant pays, issue a rent receipt identifying the partial period. Then add the charge and payment to the rent ledger so it is not confused with the first full month’s rent.
Use the free prorated-rent calculator to compare all three methods. For the ongoing tenancy, TenantHub can track the regular rent schedule, receipts, balances, and reminders in one place. Start free.
