CT-706 NT Extension: How to Get More Time to File Connecticut's Estate Tax Return

The six-month deadline for Connecticut's estate tax return catches many executors off guard. You're still gathering account statements, waiting on appraisals, or dealing with a probate court backlog — and suddenly the clock is nearly up on your CT-706 NT filing. Here's what you actually need to know about extensions, penalties, and what happens if you miss the deadline.

What Is the CT-706 NT and When Is It Due?

Form CT-706 NT is Connecticut's Estate Tax Return for Nontaxable Estates. Despite the name, it is not optional — every estate in Connecticut must file it, regardless of whether any estate tax is actually owed. The form must be filed with your local Probate Court within six months of the date of death.

The CT-706 NT serves two functions: it establishes the basis for calculating Connecticut's mandatory probate court fee (assessed against the gross estate under C.G.S. § 45a-107), and it triggers the process that leads to the release of the state's inchoate estate tax lien on any real property the decedent owned in Connecticut. Without it, you cannot legally transfer or sell the property.

For estates exceeding the $15 million exemption threshold, a separate form — CT-706/709 — is used instead, filed directly with the Department of Revenue Services (DRS) rather than the Probate Court.

Can You Get an Extension on the CT-706 NT?

Yes. Connecticut allows fiduciaries to request an extension of time to file the CT-706 NT. The extension form is filed with the Probate Court in the district where the estate is being administered.

There are a few important nuances:

An extension of time to file is not an extension of time to pay. This distinction matters enormously in Connecticut because the state's probate fee — calculated as a percentage of the gross taxable estate — accrues interest on unpaid balances. If you receive an extension to file but have not paid an estimated amount toward the probate fee, interest will still begin accruing after the 30-day payment window following the original six-month due date.

The extension only postpones the filing, not the lien. The inchoate Connecticut estate tax lien on real property remains in place until the CT-706 NT is filed, the fee is paid, and the Probate Court issues the Certificate Releasing Connecticut Estate Tax Lien. If you're racing against a real estate closing, an extension can make the situation worse, not better.

Extensions are not automatic. You must affirmatively request the extension by filing the appropriate form with the court before the original six-month deadline passes.

The Penalty for Missing the Deadline

Missing the CT-706 NT deadline without an approved extension triggers a financial penalty that is difficult to escape: interest accrues at 0.5% per month on the unpaid probate fee, beginning 30 days after the return was due.

Here's why that matters in practice. Connecticut's probate fee scales with the gross estate. For an estate valued at $700,000 — not unusual given Connecticut real estate prices — the probate fee is approximately $2,365. At 0.5% per month, that's nearly $12 per month in interest. That accumulates quickly, and the Probate Court judge has no statutory authority to waive it once it accrues.

Two groups are exempt from this interest penalty: estates valued under $40,000, and estates valued under $500,000 where any portion passes to a surviving spouse. If your estate falls into either category, the extension becomes less financially urgent — but you still need to file the CT-706 NT to clear any real estate title issues.

What Triggers the Six-Month Panic

Most executors don't even know about the CT-706 NT until something forces the issue:

• A real estate closing falls through. The buyer's attorney flags a title defect — the missing Connecticut estate tax lien release. The closing is halted until the fiduciary files the CT-706 NT, pays the probate fee, receives the Certificate Releasing the lien, and records it with the Town Clerk. When this happens six months after the death, the executor scrambles to file everything at once.
• A beneficiary demands distribution. The executor can't distribute assets freely until the DRS and Probate Court sign off. The six-month clock is already ticking.
• Tax season arrives. The decedent's final CT-1040 and any estate income tax obligations on CT-1041 surface in April — and executors realize they still haven't addressed the CT-706 NT.

If you're approaching the deadline and don't have your valuation documentation ready, filing for an extension is far better than missing the deadline without one.

How to File the CT-706 NT Extension

The extension request goes to the Probate Court in the district where the estate is pending — not to the DRS. Connecticut's 54 probate districts all use the standardized "PC" form series and accept filings either in person, by mail, or through the TurboCourt eFiling system.

When filing an extension, have the following ready:

1. The estate's approximate gross value. Even though you're extending the filing, the court will want an estimate of the estate's gross taxable value to assess whether any immediate fee payment is warranted.
2. Reason for the extension. Common justifications include pending real estate appraisals, difficulty obtaining date-of-death valuations from brokerages, or waiting for a federal 706 determination.
3. A partial fee payment, if applicable. To avoid interest from accruing, consider making an estimated payment based on your best current valuation of the gross estate.

After filing for the extension, keep working on gathering your asset inventory. The extension buys time — it doesn't resolve the underlying work.

What to Include in the CT-706 NT Itself

When you do file, the CT-706 NT requires a complete accounting of the gross taxable estate. This includes assets that do not pass through probate:

• Bank and investment accounts held jointly with right of survivorship
• Life insurance proceeds payable to named beneficiaries
• Assets held in a revocable living trust
• Real estate, including property with a survivorship deed
• Retirement accounts with designated beneficiaries

This surprises many executors. Families who set up a living trust specifically to "avoid probate" are often shocked to receive a probate court fee invoice for the full gross estate — including all trust assets. The fee is not a probate filing fee; it is an estate-size-based administrative charge that applies regardless of how assets were structured.

After Filing: The Real Estate Lien Release Process

Once the CT-706 NT is filed and the probate court issues its decree, the court will issue a Certificate Releasing Connecticut Estate Tax Lien. This document must be:

1. Obtained from the Probate Court (there is a small fee per page for certified copies).
2. Brought to the Town Clerk in each municipality where the decedent owned real property.
3. Recorded on the municipal land records (Town Clerk recording fees are $70 for the first page, $5 for each additional page).

Only after this recording does the title become clean enough for a buyer to purchase the property without the encumbrance of the state's inchoate lien.

Managing the CT-706 NT alongside the rest of the estate administration — the probate inventory, the final income tax return, and the estate's fiduciary return — takes careful sequencing. The Connecticut Final Tax & Estate Tax Guide walks through every deadline and form in order, including exactly how to calculate the gross estate, request an extension, and clear the real estate lien without losing a sale.

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