Connecticut Probate Fee Calculator: How the State Calculates What You Owe

Most people expect probate to cost a small filing fee — a hundred dollars, maybe a few hundred. In Connecticut, the bill can be several thousand dollars, and it arrives as a formal invoice from the probate court after the estate tax return is filed. Understanding how that number is calculated before you receive the invoice is one of the most useful things an executor can do.

Connecticut's probate fee structure is unlike most states. Here's how it works, how to calculate your estimated fee, and why the fee applies even to assets that never went through the court.

The Fundamental Rule: Connecticut Charges on the Gross Estate

Most states charge probate fees only on assets that physically pass through probate — solely owned property with no named beneficiary, no joint owner. Connecticut does not. Connecticut's statutory probate fee is calculated on the gross taxable estate, which includes:

• All solely owned probate assets (bank accounts, investment accounts, real estate, personal property)
• Living trust assets
• Jointly held bank accounts and investment accounts
• Payable-on-death accounts
• Transfer-on-death accounts
• Life insurance proceeds (in most circumstances)

This is the central surprise in Connecticut estate administration. A family that spent money on estate planning — setting up a living trust, adding joint owners to accounts, naming beneficiaries on retirement accounts — to "avoid probate" still owes a Connecticut probate fee calculated on the full value of all those assets. The court doesn't care that the assets bypassed the formal court process. The fee applies anyway.

The legal authority is CGS § 45a-107. Connecticut removed the maximum cap on probate fees in 2015, so there is no ceiling — the fee scales with the estate's value without limit.

The Fee Schedule

For decedents who died on or after July 1, 2016, the fee is calculated in tiers:

The fee is not a single flat percentage — it's a tiered formula where each bracket applies only to the portion of the estate that falls within it. Calculate each tier separately and add them together.

How to Estimate Your Fee

Step 1: Identify all assets in the gross estate. List every account, property, and policy that was owned by the decedent. Include non-probate assets. Get the fair market value as of the date of death for each item.

Step 2: Apply the spousal reduction. Any portion of the estate that passes to a surviving spouse is valued at 50% for the purpose of the fee calculation. If the estate is worth $800,000 and $400,000 passes to a surviving spouse, you calculate the fee on the full $800,000 but treat $400,000 of it at 50% — effectively computing the fee on $600,000 of gross estate value.

Step 3: Run the tiered formula. Apply each bracket to the relevant slice of the estate value.

Example: Gross estate of $800,000, with $400,000 passing to a surviving spouse. After the 50% spousal reduction on that half, the effective fee base is $600,000.

• First $10,000: $150
• Next $490,000 (from $10,000 to $500,000): $490,000 × 0.35% = $1,715
• Next $100,000 (from $500,000 to $600,000): $100,000 × 0.25% = $250
• Total: $150 + $1,715 + $250 = $2,115

For a $1.5 million estate with no spousal reduction:

• First $10,000: $150
• Next $490,000: $1,715
• Next $1,000,000: $1,000,000 × 0.25% = $2,500
• Total: $150 + $1,715 + $2,500 = $4,365

The probate court also provides a statutory fee calculator on its website at ctprobate.gov, which you can use as a check against your manual calculation.

When the Fee Is Invoiced

The probate fee is not due at the time you open the estate. The process works like this:

1. The executor files Form CT-706 NT (the Connecticut Estate Tax Return for Nontaxable Estates) with the probate court within six months of the date of death.
2. The court reviews the asset values reported on the CT-706 NT.
3. The court calculates the statutory probate fee and issues a formal invoice.
4. The executor has 30 days from the invoice date to pay the fee.

If the CT-706 NT is not filed by the six-month deadline, Connecticut begins charging 0.5% per month interest on the fee — not from the date the invoice is issued, but from the date the return was due. This means that even before the court has calculated what you owe, the interest clock on that unpaid amount is running.

If the fee invoice is paid late — more than 30 days after it is issued — the same 0.5% monthly interest applies to the unpaid balance.

What to Do If the Fee Is Higher Than Expected

There is no mechanism to negotiate or reduce the statutory probate fee in Connecticut — it is set by statute, and the court has no discretion. The only legitimate way to affect the fee is through the spousal reduction on assets passing to a surviving spouse.

If the gross estate figure seems wrong when the court's invoice arrives, you can review the CT-706 NT values and contact the probate court to discuss a discrepancy. Errors in the original return can sometimes be corrected, but this requires refiling documentation and can delay the entire estate.

The most practical approach is to run your own fee estimate before filing the CT-706 NT, using the tiered formula above, so the invoice is not a surprise. Knowing the fee in advance also lets you ensure the estate has sufficient liquid assets to pay it without delaying distributions to heirs.

The Inventory's Role in the Fee Calculation

In addition to the CT-706 NT, the executor must file an Inventory (Form PC-2407) with the probate court within two months of appointment. This inventory lists all solely owned assets at date-of-death fair market value.

The probate fee is calculated on "the greatest of the gross estate for tax purposes or the estate inventory." In most cases, the gross estate for tax purposes (from the CT-706 NT) will be larger because it includes non-probate assets that don't appear on the inventory. But if the inventory somehow captures higher values, that becomes the fee basis. In practice, ensure the CT-706 NT values and the inventory values are consistent and well-documented.

Connecticut probate fees are one of the more confusing cost elements in the estate settlement process — especially because they apply to assets families assumed would bypass the probate system entirely. The Connecticut Estate Settlement Guide includes a step-by-step fee calculation worksheet, guidance on filing the CT-706 NT, and a complete timeline of every deadline in the Connecticut probate process.

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