What does the trust fund projection tool estimate?

The tool estimates how a trust fund might grow over time based on starting balance, annual contributions, investment returns, and distributions to beneficiaries. It produces a year-by-year schedule of balances and cash flows.

How are investment returns modeled?

Returns are modeled using a simple compound growth formula. Each year, the trust balance grows by the chosen annual return rate, then contributions are added and distributions are subtracted. This is a simplified model that assumes a steady rate and does not include market volatility.

Can I model distributions as a percentage of the balance?

Yes. You can choose between fixed annual distributions or a percentage of the starting balance each year. The tool applies the selected distribution mode to the projected trust balance.

Does the tool account for trustee fees or taxes?

No. The current version focuses on pre-fee, pre-tax growth and distributions. You can approximate fees or taxes by using a lower effective return rate or manually adjusting the results after exporting the CSV.

Is this legal or estate planning advice?

No. The trust fund projection tool is for education and scenario planning only. It does not provide legal, tax, or fiduciary advice. Trust structures and distribution rules should be designed with qualified professionals.

Can I export the trust projection schedule?

Yes. Use the Export CSV button to download a year-by-year schedule of balances, contributions, returns, and distributions. You can import this file into a spreadsheet or share it with your estate planning team.

Trust Fund Projection Tool

Model how a trust fund can grow and support beneficiaries over time. Enter starting balance, contributions, investment returns, and distribution rules to see a clear year-by-year projection of trust assets.

Starting trust balance Expected annual return (%) Number of years to project

Annual contribution to trust Distribution mode Annual distribution amount

Annual distribution (%) Inflation rate (optional, %) Scenario label (optional)

Tip: Start with conservative return assumptions and realistic distributions, then explore more generous scenarios.

Important: This tool uses simplified compound growth and distribution formulas. Actual trust performance depends on investment choices, fees, taxes, legal terms, and market volatility. Use this projection for education and planning conversations, and confirm details with qualified legal and financial professionals.

Trust fund projection formulas

The trust fund projection tool uses a set of deterministic formulas to model how a trust might evolve over time. These formulas help you see the interaction between investment returns, contributions, and distributions, and how they shape the long-term balance available for beneficiaries.

1. Annual growth with contributions

Annual return rate (decimal) = Annual return (%) ÷ 100

Balance after growth =
  Balance at start of year × (1 + Annual return rate)

Balance after contributions =
  Balance after growth + Annual contribution

This formula models the trust as an investment account that grows each year and receives new contributions. Contributions are added after growth, which is a common way to approximate annual funding.

2. Fixed annual distributions

Balance after growth and contributions =
  Balance at start of year × (1 + Annual return rate) + Annual contribution

Balance at end of year =
  Balance after growth and contributions − Fixed annual distribution

If Balance at end of year < 0, it is set to 0.

When you choose fixed distributions, the trust pays out a constant amount each year. This can be useful for modeling predictable support, such as a stipend or scheduled beneficiary payments.

3. Percentage-based distributions

Distribution amount for year n =
  Balance at start of year n × (Distribution % ÷ 100)

Balance after growth and contributions =
  Balance at start of year × (1 + Annual return rate) + Annual contribution

Balance at end of year =
  Balance after growth and contributions − Distribution amount

Percentage-based distributions scale with the starting balance each year. This can help keep the trust sustainable, because payouts adjust as the trust grows or shrinks.

4. Inflation-adjusted trust value (optional)

Inflation rate (decimal) = Inflation (%) ÷ 100

Real (inflation-adjusted) balance in year n =
  Nominal balance in year n ÷ (1 + Inflation rate)ⁿ

If you enter an inflation rate, the tool estimates the inflation-adjusted value of the trust each year. This helps you understand the purchasing power of future balances, not just the nominal dollar amounts.

These formulas are intentionally simple and transparent. Real trust administration involves more complexity: varying returns, fees, taxes, legal distribution rules, and changes in contributions over time. Use this projection as a starting point to explore scenarios and build intuition before working through detailed planning with your advisors.

Designing trust fund projections for real families

A trust fund is more than a financial instrument—it is a way of expressing values, priorities, and care for future generations. The trust fund projection tool helps you translate those intentions into numbers: how much might be available, how often distributions occur, and how long the trust could last under different assumptions.

Clarifying the purpose of the trust

Before you start modeling, it helps to clarify what the trust is meant to do. Is it focused on education, basic support, wealth preservation, or philanthropy? A trust designed to fund college tuition might have heavy distributions in the early years and modest contributions later. A trust focused on lifetime support might aim for sustainable distributions over decades. A preservation-oriented trust might minimize distributions and prioritize growth.

Once you have a sense of purpose, you can use the tool to test different contribution and distribution patterns. For example, you might model a scenario where contributions continue for 20 years, then stop, while distributions begin later and ramp up as beneficiaries reach certain ages. Even though the tool uses simple annual assumptions, it can still show how sensitive the trust is to timing and amounts.

Balancing growth and distributions

Trust planning often involves a tension between supporting beneficiaries now and preserving assets for later. If distributions are too aggressive, the trust may deplete quickly. If distributions are too conservative, beneficiaries may receive less support than intended. The projection schedule shows how the balance responds to different distribution modes.

In fixed distribution mode, you can see how a constant annual payout interacts with growth and contributions. If the payout is modest relative to returns and contributions, the trust may still grow. If the payout is large, the balance may plateau or decline. In percentage mode, distributions scale with the starting balance each year, which can help keep the trust aligned with its size and reduce the risk of over-distribution.

Worked example

Imagine you establish a trust with an initial balance of $500,000. You plan to contribute $25,000 per year for 20 years, expect a long-term annual return of 5.5%, and want to model 40 years. You decide to start distributions at 3.5% of the starting balance each year to support beneficiaries without exhausting the trust too quickly.

In the tool, you might set:

Starting trust balance: $500,000
Annual return: 5.5%
Years: 40
Annual contribution: $25,000 (assuming contributions continue throughout the modeled period)
Distribution mode: Percentage
Distribution %: 3.5%
Inflation: 2.5% (optional)

The schedule will show each year’s starting balance, growth, contributions, distributions, and ending balance. Over time, you may see the nominal balance grow while the inflation-adjusted balance reflects more modest real growth. This can help you judge whether your distribution rate feels sustainable and whether the trust might still have meaningful value for future generations.

Practical tips

Use conservative return assumptions; long-term averages are not guarantees.
Experiment with different distribution rates to see how quickly the trust might be depleted.
Consider modeling separate scenarios for different beneficiary groups or phases of life.
Export the CSV and share it with your estate planning attorney and financial advisor.
Remember that trust documents, tax rules, and fiduciary duties may impose constraints beyond what this tool models.

By turning trust planning into a clear projection, you can have more grounded conversations with family members and advisors. The numbers won’t capture every nuance, but they can reveal patterns: which strategies preserve assets, which provide generous support, and how your choices today might shape the financial landscape for the people and causes you care about.

Frequently Asked Questions

How many years can I project?

You can project up to 100 years. For most trust scenarios, 20–50 years is a practical range, but longer horizons can be useful when thinking about multi-generational support.

What happens if distributions exceed growth and contributions?

If distributions are large relative to returns and contributions, the trust balance may decline and eventually reach zero. The tool caps the balance at zero and continues to show distributions as long as the plan specifies them, which can highlight unsustainable strategies.

Can I stop contributions after a certain year?

The current version assumes a constant annual contribution throughout the modeled period. To approximate a stop date, you can export the CSV and manually adjust contributions in a spreadsheet, or run separate scenarios with different contribution durations.

How does inflation affect the results?

Inflation does not change the nominal balances; it is used to calculate an additional “real” value column in the schedule. This helps you understand how much purchasing power the trust might represent in future years.

Is this tool suitable for complex trust structures?

The tool is designed for simple projections and does not model tiered beneficiaries, age-based triggers, or detailed legal provisions. It can still be useful for high-level planning, but complex trusts should be modeled with specialized tools and professional guidance.

Does the tool store my data?

The tool briefly stores your last inputs in localStorage to restore them after a refresh and auto-run the projection. After the projection is restored, the saved inputs are cleared. No data is sent to external services unless you enable analytics or ads via the cookie banner.