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Tax Proration Calculator 2026 - Property Tax Proration at Closing (365 vs 360)

A tax proration calculator helps buyers, sellers, agents, and closing teams estimate the property tax credit at a real estate closing. Even though the concept is simple—split taxes based on who owned the home for which days—the details can get confusing fast because proration depends on:

• whether property taxes are paid in arrears or in advance
• which day-count convention your contract or local practice uses (Actual/365/366 vs 30/360)
• whether the closing day belongs to the buyer or the seller
• what tax period the annual tax covers (calendar year vs custom fiscal period)

What is tax proration in real estate?

Tax proration is the process of dividing property taxes between the buyer and seller based on how long each party owned the property during a defined tax period.

At closing, prorations usually show up as a credit on the settlement statement:

• Seller-to-buyer credit (common when taxes are unpaid so far)
• Buyer-to-seller credit (common when seller already paid for time the buyer will own)

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Why tax proration exists (the practical reason)

Property tax bills often don’t line up perfectly with closing dates. Someone will own the property for part of a tax period but may not be the one who receives the bill.

Proration ensures:

• the seller pays for the days they owned the home, and
• the buyer pays for the days they own the home.

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The standard tax proration formula

Most tax proration calculators start with two steps:

1) Calculate the daily tax rate

Daily Tax Rate = Annual Tax Amount ÷ Days in Year (or Period)

Days in year depends on the day-count method:

• Actual days: 365 in a normal year, 366 in a leap year
• 360-day year (30/360): always 360

2) Multiply by the number of days owned

Prorated Amount = Daily Tax Rate × Number of Days

That prorated amount becomes a closing credit (either direction) depending on whether taxes are paid in arrears or advance.

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The two big proration questions every closing must answer

Question A: Are taxes paid in arrears or in advance?

1) Taxes paid in arrears (very common)

“Paid in arrears” means the tax bill comes after the period of ownership.

• The seller has used the property for part of the year
• The bill hasn’t been paid yet
• The buyer will often pay the bill later
• So the seller typically gives the buyer a credit for the seller’s portion

Rule of thumb (arrears):
Seller credits Buyer for the seller-owned days.

2) Taxes paid in advance

“Paid in advance” means the tax bill is paid before the ownership period (or the seller has already paid an installment that covers time after closing).

• The seller paid for a period the buyer will enjoy
• So the buyer reimburses the seller for the buyer’s portion

Rule of thumb (advance):
Buyer credits Seller for the buyer-owned days.

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Question B: Which day-count method is used (365/366 vs 360)?

Different states, counties, contracts, and lenders may use different conventions. The two most common are:

1) Actual-day method (365 or 366)

• Uses the real calendar days
• 2026 is not a leap year → 365 days
• A leap year like 2024 → 366 days

This method is intuitive and common in many contracts.

2) 360-day method (30/360)

• Assumes each month has 30 days
• A year is always 360 days
• Sometimes called “statutory” or “banking year” in proration contexts

This can slightly change the daily rate and the proration amount.

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Closing day ownership: who gets the closing date?

Many contracts specify whether the seller owns the property through the closing day (inclusive), or whether the buyer owns it on the closing day.

This matters because it changes the day count by 1 day.

Typical options:

• Seller owns through closing day (seller’s days include closing date)
• Buyer owns on closing day (seller’s days stop the day before)

A good tax proration calculator includes a toggle for this.

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Sample calculation (2026 example from your overview)

Let’s use the exact example so you can see how a calculator should work.

Inputs

• Annual tax: $4,000
• Closing date: March 15, 2026
• Seller owns through closing day: Yes
• Day-count: Actual days (365) because 2026 is not a leap year
• Taxes paid: In arrears

Step 1: Daily rate

Daily rate = $4,000 ÷ 365 = $10.9589… ≈ $10.96/day

Step 2: Seller days

If seller owns through March 15, seller days are:

• January: 31
• February: 28
• March: 15
  Total = 74 days

Step 3: Seller portion

Seller portion = 74 × $10.9589… = $811.04 (rounded)

Step 4: Determine credit direction (arrears)

In arrears → seller hasn’t paid yet → buyer will likely pay later →
Seller credits Buyer $811.04 at closing.

That’s the closing proration credit most calculators will display.

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What changes if you use the 360-day method?

Using the same annual tax amount, the daily rate changes:

• Daily rate (360) = $4,000 ÷ 360 = $11.11/day

Now you also need seller days under 30/360 counting rules (each month treated as 30 days). Depending on the exact 30/360 convention used, the seller day count may differ slightly from actual calendar days—this is why contracts matter.

Bottom line: 360-day method often produces a different proration amount than actual/365. If your settlement statement uses 30/360, your calculator should match that method.

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How to use a tax proration calculator (step-by-step)

A well-designed tax proration calculator will typically ask for:

Step 1: Enter the annual tax amount

Use the best available number:

• last tax bill
• current assessor statement
• lender escrow estimate (if that’s all you have)

Tip: If taxes are being reassessed, your “annual tax” could be different later. Run a conservative and a higher scenario.

Step 2: Select the tax year and tax period

Most of the time:

• tax period is Jan 1 to Dec 31
  But some locations have fiscal periods or installment systems. If your calculator supports custom period start/end, use it.

Step 3: Choose the closing date

Then decide the closing-day ownership rule:

• seller owns through closing day (common in examples)
• buyer owns on closing day (some contracts)

Step 4: Choose “paid in arrears” or “paid in advance”

This determines who pays whom:

• arrears → seller credits buyer for seller portion
• advance → buyer credits seller for buyer portion

Step 5: Choose the day-count convention

• Actual days (365/366) for calendar realism
• 360-day for statutory/banking-style prorations

Step 6: Read outputs

A good calculator will display:

• daily tax rate
• seller days + seller portion
• buyer days + buyer portion
• closing credit (direction + amount)
• a clear breakdown table you can match to your closing statement

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How much is the tax proration credit at closing?

Many users search for “how much will I owe” or “how much credit will I get.” A practical way to think about it:

• If taxes are in arrears: Seller credit ≈ (annual tax ÷ days) × seller days
• If taxes are in advance: Buyer credit ≈ (annual tax ÷ days) × buyer days

So the size of the proration credit is driven mainly by:

1. Annual tax amount
2. Closing date timing (early vs late in the year)
3. Day-count method (365/366 vs 360)
4. Closing day rule (inclusive/exclusive)

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Tips to get accurate proration numbers (and avoid closing surprises)

1) Match your contract’s proration clause

If your contract states 360-day method but you calculate with 365-day, you’ll be off.

2) Confirm the tax period (it’s not always the calendar year)

Some counties or systems use different periods or bills. If the annual tax represents a different timeframe, set the period start/end accordingly.

3) Don’t forget leap years (366 days)

If the relevant year is a leap year, the daily rate becomes slightly smaller (annual ÷ 366), which changes the proration.

4) Clarify “seller owns through closing day”

One day can move the credit by:

• daily rate × 1 day
  That can be $5–$50+ depending on taxes.

5) Installments and escrow can complicate “advance vs arrears”

Even “arrears states” can have situations where:

• one installment is already paid
• another isn’t
• lender escrow accounts are involved
  A simple calculator is still useful, but you may need a more detailed installment-based approach.

6) Round like the closing statement rounds

Some settlements round to cents; others round differently. Use the same rounding rule so your result matches the document.

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Common proration mistakes (what causes mismatches)

• Using 365 when the closing uses 360
• Counting days incorrectly (especially around closing day inclusion)
• Using the wrong annual tax amount (old bill vs reassessed bill)
• Assuming Jan–Dec tax year when it’s actually a fiscal cycle
• Forgetting that exemptions or reassessments may change the final bill

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FAQ/Frequently Asked Questions

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