QPRT Discount Calculator: How to Value Your Home for Estate Tax Planning

What a QPRT Actually Does

A Qualified Personal Residence Trust transfers your home to beneficiaries, typically children, at a discounted gift tax value. You retain the right to live in the property for a fixed term, usually 5 to 15 years. At the end of that term, ownership passes to the remainder beneficiaries.

The IRS taxes only the remainder interest, not the full fair market value. The retained interest, which is your right to occupy the property for the term, reduces the taxable gift dollar for dollar.

A $2,000,000 home transferred outright uses $2,000,000 of your lifetime exemption. The same home transferred through a well-structured QPRT might produce a taxable gift of $900,000 to $1,300,000, depending on your age, the term length, and the current Section 7520 rate.

That spread is not theoretical. It is actuarial math applied to IRS Publication 1457 tables.

The Three Variables That Determine Your Discount

1. The Section 7520 Rate

The IRS sets this rate monthly at 120% of the applicable federal mid-term rate. A higher Section 7520 rate produces a larger retained interest discount, meaning a smaller taxable gift.

At a 5.2% Section 7520 rate, the present value of a 10-year retained interest is materially higher than at 3.0%. Every grantor establishing a QPRT should check the current rate before signing documents. Attorneys sometimes use the rate from their drafting software's last update. That may not be the current month's published figure.

2. Grantor Age

The IRS survival probability tables determine what portion of the retained interest actually has actuarial value. Older grantors, who statistically have shorter life expectancies, receive smaller retained interest discounts on longer terms because the probability of surviving the full term is lower.

A 60-year-old grantor on a 10-year term carries a different actuarial survival factor than a 72-year-old on the same term. That difference directly affects the retained interest valuation.

3. QPRT Term Length

Longer terms produce larger retained interest discounts, all else equal. A 15-year retained right to occupy is worth more in present value terms than a 5-year right.

The tradeoff is mortality risk. If the grantor dies during the term, the full property value returns to the taxable estate. The QPRT fails its purpose entirely. Selecting a term that is actuarially aggressive relative to life expectancy defeats the structure.

The Core Formula, Written Plainly

The taxable gift equals the fair market value of the home minus the present value of the retained interest.

The present value of the retained interest equals the fair market value multiplied by the retained interest factor.

The retained interest factor comes from IRS Table B (term certain annuity factors) adjusted by the grantor's survival probability from Table 90CM.

In practice:

Retained Interest Factor = (Annuity Factor for Term at Section 7520 Rate) x (Survival Probability for Grantor's Age and Term)

Taxable Gift = FMV x (1 - Retained Interest Factor)

You do not need to memorize the tables. You need to know where to find them and which values to pull. IRS Publication 1457, Table B gives the term-certain factors. Table 90CM gives the mortality adjustments.

Worked Example 1: A $1.5M Home, Age 62, 10-Year Term

Assumptions:

• Fair market value: $1,500,000
• Grantor age: 62
• QPRT term: 10 years
• Section 7520 rate: 5.2%

From IRS Table B at 5.2%, the present value factor for a 10-year annuity of $1 per year is approximately 7.6017. But the QPRT retained interest is not structured as a cash annuity. The relevant factor for a term-certain interest comes from the single-life and term tables combined.

Using the IRS actuarial tables for a 62-year-old on a 10-year term at 5.2%, the retained interest factor works out to approximately 0.5841. (This figure reflects the probability-adjusted present value of 10 years of occupancy rights.)

Retained interest value: $1,500,000 x 0.5841 = $876,150

Taxable gift: $1,500,000 minus $876,150 = $623,850

Without the QPRT, this grantor uses $1,500,000 of the federal lifetime exemption. With the QPRT, the gift uses $623,850. The structure preserves $876,150 of exemption for other assets.

At the current 40% federal estate tax rate, that exemption preservation represents a potential estate tax saving of $350,460 on this single asset.

Worked Example 2: A $3M Home, Age 68, 7-Year Term

Assumptions:

• Fair market value: $3,000,000
• Grantor age: 68
• QPRT term: 7 years
• Section 7520 rate: 5.2%

At 68, survival probability for a 7-year term is high, roughly 84.3% based on 90CM tables. The retained interest factor at this age and rate for a 7-year term approximates 0.4612.

Retained interest value: $3,000,000 x 0.4612 = $1,383,600

Taxable gift: $3,000,000 minus $1,383,600 = $1,616,400

An outright transfer would consume $3,000,000 of exemption. The QPRT structure reduces that to $1,616,400. The savings in exemption: $1,383,600. At a 40% marginal estate rate, the potential tax benefit exceeds $553,000.

The 7-year term is aggressive for age 68, but not imprudent. Extending to 10 years would improve the discount but raise the mortality risk meaningfully.

What Changes When the Section 7520 Rate Moves

The Section 7520 rate is not a background detail. It is the central pricing mechanism of the QPRT.

Consider the same $3M home, same grantor age of 68, same 7-year term:

At a 3.0% Section 7520 rate, the retained interest factor shrinks. The taxable gift rises. At 3.0%, the retained interest factor for this profile approximates 0.3791. The taxable gift becomes $3,000,000 x (1 - 0.3791) = $1,863,300. That is $246,900 more in taxable gift value than the 5.2% scenario.

Higher rates are better for QPRTs. Grantors who established QPRTs in 2021 and 2022, when rates sat below 1.5%, received minimal discounts. Those establishing structures in 2025 and 2026 benefit from the rate environment.

Common Errors That Change the Gift Value

Wrong age at establishment. The IRS uses the grantor's age at the nearest birthday. Using age 65 when the grantor is 64 years and 7 months means using age 65. Using age 64 when they are 64 years and 4 months means 64. A one-year difference in the actuarial table produces a different retained interest factor.

Using last month's Section 7520 rate. The IRS publishes rates monthly. The rate in effect when the trust is funded governs. Check the current published rate, not the default in older software.

Ignoring the mortality adjustment. Some simplified QPRT calculations apply only the term-certain factor without the survival probability adjustment. This overstates the retained interest and understates the taxable gift. The IRS uses combined factors.

Appraisal timing errors. The fair market value base must reflect the property's value on the date of the transfer to the trust. A stale appraisal, even one that is 90 days old, introduces risk in an audit.

Why Running the Numbers Yourself Matters

Your estate attorney will calculate this correctly. That service costs time billed at $400 to $600 per hour, and preliminary scenarios often consume two to three hours before the engagement produces a recommendation.

Running your own scenario first costs nothing. It lets you arrive at the attorney meeting knowing whether a 7-year or 10-year term produces the better outcome for your situation. It lets you ask specific questions rather than general ones.

The CalcMoney QPRT tool accepts your home's fair market value, your age, your proposed term, and the current Section 7520 rate. It outputs the retained interest value, the taxable gift, and the exemption preserved. The calculation takes under two minutes.

When a QPRT Does Not Work

A QPRT fails if the grantor dies during the term. The full property value, including appreciation, returns to the taxable estate. The gift tax return filed at funding becomes irrelevant.

A QPRT also fails if the grantor needs to sell the residence during the term without replacement. The trust must invest sale proceeds in a new qualifying residence within a specified window or the retained interest loses its qualified status.

For grantors with significant health concerns, a shorter term reduces mortality risk but shrinks the discount. At some combination of age and health, the QPRT no longer produces enough discount to justify the structural complexity and legal cost.

Running Your Numbers

The variables are finite. The formula is deterministic. The only inputs you need are your home's current fair market value, your age at the nearest birthday, your proposed term, and the current month's Section 7520 rate.

Pull the current Section 7520 rate from IRS.gov. Enter your values. The CalcMoney calculator produces the retained interest factor, the present value of that interest, and the resulting taxable gift.

If the taxable gift on your property is meaningfully below your current estate exposure, the QPRT conversation with your attorney is worth having. If the numbers are marginal, you have saved yourself a billable hour.

Calculate your QPRT retained interest value on CalcMoney →

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Results are estimates for informational purposes only. Consult a licensed financial professional before making financial decisions.