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GRAT Calculator

Model how a Grantor Retained Annuity Trust could distribute wealth to beneficiaries by comparing annuity payments against trust growth over your chosen term.

Quick answer: Model a simplified zeroed-out GRAT annuity and remainder scenario using entered growth and Section 7520 rates. Enter Initial Funding, Assumed Asset Growth Rate, Section 7520 Rate, and Term (Years) to personalize the estimate. It returns Modeled Remainder After Annuity Payments, Actual Trust Value at End of Term, and Annual Annuity Payment (Zeroed-Out GRAT) so you can compare the impact before choosing a next step. Use it to compare long-term value, tax impact, risk, time horizon, and contribution choices.

SWReviewed by SwitchWize Research Desk · Last reviewed July 20, 2026
Modeled Remainder After Annuity Payments
$1,610,510
Modeled Remainder After Annuity Payments
$1,610,510
Actual Trust Value at End of Term
$1,610,510
Annual Annuity Payment (Zeroed-Out GRAT)
$230,975
Diagnostic

After modeled annual annuity payments, the illustrative remainder is $1,610,510.

A zeroed-out GRAT over 5 years would require an annual annuity payment of about $230,975.

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What to do next

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Your action plan
  1. 1

    Set the target and timeline for this plan

    Model a simplified zeroed-out GRAT annuity and remainder scenario using entered growth and Section 7520 rates.

  2. 2

    Pressure-test one alternate scenario before deciding

    Assumptions change the answer, especially when rates, taxes, or timing matter.

  3. 3

    Save the result to Money Map or use the linked next action

    Turn the result into a prioritized action instead of treating it as a one-off number.

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This is an educational estimate, not tax, legal, investment, or lending advice. Tax rules, rates, and eligibility change and depend on your full situation. Confirm with a qualified professional or the provider before acting.

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Frequently Asked Questions

Everything you need to know.

What does an example GRAT Calculator calculation look like?
Using this calculator's own default assumptions, a initial funding of $1,000,000, assumed asset growth rate of 10% and term (years) of 5 produces an estimated modeled remainder after annuity payments of $1,610,510 and actual trust value at end of term of $1,610,510. Enter your own numbers above to see how it changes for your situation.
What's the difference between the trust value and the remainder?
The trust value at the end of the term is what your assets have grown to. The remainder is what's left over after you've received all your annuity payments: that's the amount passing to your beneficiaries. If growth exceeds the government discount rate, the remainder grows larger than your initial gift, creating wealth transfer with tax efficiency.
How does the federal rate affect my annuity payment?
The federal rate is used to calculate how much you must receive back each year as an annuity. A higher rate increases your required annual payment, leaving less to grow for beneficiaries. A lower rate reduces your payment and allows more assets to stay in the trust and compound, potentially creating larger tax-free gains for the next generation.
Is the GRAT Calculator free to use?
Yes. SwitchWize calculators are free, and you do not need an account to run scenarios or view the result.
Does using the GRAT Calculator affect my credit score?
No. Using a calculator does not trigger a credit check. A credit impact can occur only if you apply directly with a lender, card issuer, or provider.
Are the results personalized financial advice?
No. Calculator outputs are educational estimates based on the inputs you enter. Review assumptions and confirm terms directly with providers before making a financial decision.
What should I do after seeing the result?
Use the recommendation module on this page to compare brokerage accounts, or run Money Map to compare this investing & retirement decision with your other opportunities.
How does SwitchWize choose related offers?
Related offers are matched by the calculator surface (brokerage) and ranked using SwitchWize data such as rate, fees, trust signals, product fit, and switching friction. Paid relationships do not change organic ranking order.
How fresh are the rates and offers shown?
Rate and offer data is reviewed on a recurring cadence and every offer module shows review context or links to the methodology and disclosure pages.
Where can I see the ranking methodology?
The SwitchWize methodology page explains how rate freshness, editorial review, affiliate disclosure, and category ranking factors work.
Can Money Map use this result?
Yes. Money Map is the broader diagnostic path: it compares savings, mortgage, cards, and debt so you can see whether this calculator result is your highest-impact next move.

Why This Matters

A GRAT works by paying you a fixed annuity each year while the remaining trust assets pass to beneficiaries tax-free if growth exceeds a government rate. Understanding how your assumed asset growth compares to that rate shows whether excess gains can transfer efficiently to the next generation. The longer the term and higher the growth rate, the more potential wealth can be removed from your taxable estate at little or no gift tax cost.

How to Use It

  1. 1Enter the amount you plan to fund into the GRAT.
  2. 2Input your expected annual asset growth rate as a percentage.
  3. 3Enter the applicable federal rate (the discount rate used to value the annuity).
  4. 4Choose how many years the GRAT will run.
  5. 5Review the trust value at term end, the projected remainder for beneficiaries, and your annual annuity payment amount to see how much wealth could transfer efficiently.
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