Closing Proration Calculator
Accurately estimate daily property tax, prepaid interest, and HOA proration charges due at the closing table. Prevent financial surprises by calculating the exact per diem credits and debits required to finalize your real estate transaction.
Input your parameters to generate the Closing Proration Calculator results.
How to Use This Calculator
Get accurate results in seconds by following these simple steps.
Taxes & HOA
Enter your assumed annual taxes and monthly HOA dues.
Closing Date
Enter the number of days left in the month you are closing.
Review Results
Examine prepaid interest, tax prorations, and HOA credits to verify your closing disclosure.
Why Use This Tool?
No Surprises at the Table
Know exactly what your closing disclosure will look like.
Per Diem Accuracy
Calculates the exact daily interest due before your first full payment.
Fair Settlement
Distributes pre-paid costs based on the exact calendar day each party occupies the home.
How Mortgage Proration Works
When closing on a home, financial obligations like property taxes and HOA dues rarely align perfectly with the transfer of ownership. Proration guarantees fairness by dividing these costs on a strict per diem (daily) basis.
The calculator determines your prepaid interest by multiplying your new remaining loan balance by your daily interest rate. This covers the 'gap' period before your first official mortgage payment becomes due.
Property taxes are generally billed annually. If the seller already paid the entire year, the buyer must reimburse them (credit) for the days they will own the property. If taxes are in arrears, the seller credits the buyer.
Similarly, Homeowners Association (HOA) dues are prorated based on the exact day of closing. The seller is responsible exclusively for the days they held title, shifting the financial burden seamlessly to the buyer mid-month.
Title companies and escrow officers utilize these exact mathematical formulas to populate the standard Closing Disclosure (CD) line items.
By forecasting these adjustments early, prospective buyers avoid unexpected cash shortages on closing day and maintain tight control over their necessary cash-to-close liquidity.
Frequently Asked Questions
Per diem interest is the daily interest charge accruing on your new mortgage from the day of closing until the last day of that exact calendar month.
Taxes are split chronologically. The seller is financially responsible for the portion of the tax year prior to the closing date, and the buyer assumes responsibility from the closing date onward.
Closing at the very end of the month dramatically reduces the amount of prepaid interest the buyer must bring to the table, preserving immediate liquid cash.
Yes, you can generally deduct the portion of the property taxes that covers your specific period of ownership, even if the seller technically remitted the check to the municipality.
While standard prorations settle past or immediate debts between buyer and seller, lenders will also separately require you to 'seed' an escrow account with several months of reserved tax and insurance payments.
Standard real estate contracts typically include a tax reproration agreement, allowing either party to request a financial adjustment once the finalized, official tax bill is released later in the year.
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