Trust principal and income allocation rules decide which trust receipts and expenses belong to the wealth the trust is preserving and which belong to the earnings a current beneficiary can spend. When the trust document is silent, state law fills the gap, most often through the Uniform Fiduciary Income and Principal Act (UFIPA) approved by the Uniform Law Commission in 2018. Get the split wrong and the trustee can be held personally liable to whichever beneficiary lost out.
What Counts as Principal and What Counts as Income
Principal is the wealth the trust was built to preserve. It includes whatever the grantor originally transferred in, anything added later, and any growth in the value of those assets. A capital gain on a stock sale stays in principal. So do insurance proceeds that replace damaged property and additional shares from a stock split. Future beneficiaries care about principal because it’s what they eventually receive.
Income is what the principal earns while it sits in the trust: rent from real estate, interest on bonds, cash dividends, net profits from a trust-owned business, and generally royalties from intellectual property. Current beneficiaries live on it.
The line can feel counterintuitive. A stock might double in value, and that unrealized appreciation is still principal. The quarterly dividend on the same stock is income. The system treats the tree and its fruit as different things, and the trustee has to hold that line.
Default Rules for Receipts
If the trust instrument gives specific instructions, those instructions control. Where it’s silent, the UFIPA (or the older Uniform Principal and Income Act in states that haven’t updated) supplies the defaults.
Ordinary earnings from trust property go to income. Distributions from a partnership or LLC are generally allocated based on their character. Receipts from liquidating assets follow a formula: up to a fixed percentage of the asset’s value is treated as income, with the rest going to principal. Under the UFIPA, states set that percentage somewhere between 3% and 5%.
Some receipts are split. Certain derivative transactions are allocated 90% to principal and 10% to income. The same 90/10 split historically applied to deferred compensation and retirement plan distributions received by the trust, on the theory that the payment gradually consumes the underlying asset. A trustee can skip an allocation entirely if the amount is insubstantial; the UFIPA presumes that when the allocation would change net income by less than 10% and the asset producing the receipt is worth less than 10% of the trust’s total value.
Default Rules for Expenses
Ordinary, recurring costs come out of income. Property taxes, insurance premiums, and routine maintenance all keep the income-producing assets running, so income bears them.
Costs that benefit both current and future beneficiaries are typically split. Trustee compensation and investment advisory fees are the classic example: half charged to income, half to principal, on the theory that professional management protects both sides.
Large, one-time expenses come out of principal. Legal fees to defend the trust’s ownership of property, the cost of major litigation, and capital gains taxes all reduce the corpus. These expenses relate to the underlying assets rather than to the earnings they generate.
Wasting Assets, Oil and Gas, and Timber
Assets that get consumed as they produce cash require special treatment. A royalty check from an oil lease isn’t like a dividend; part of the payment reflects oil that’s gone forever.
Under the UFIPA, nominal delay rentals and annual lease payments on mineral interests go entirely to income. Royalties, shut-in-well payments, take-or-pay payments, and bonuses are split “equitably” between income and principal. The act builds in a safe harbor: the allocation is presumed equitable if the amount credited to principal equals the depletion deduction allowed by the Internal Revenue Code. Working interests and production payments follow similar split-allocation rules.
Timber works differently because trees grow back. Receipts from timber sales go to income to the extent the amount cut doesn’t exceed the growth rate during the accounting period. Anything cut beyond that growth rate goes to principal. Sales of standing timber are always principal. The trustee may also set aside a reasonable depletion reserve from timber receipts. The rules stop a trustee from maximizing current income by stripping a resource future beneficiaries are counting on.
When the Default Split Produces an Unfair Result
The old allocation rules worked well when trusts held bonds and dividend-paying stocks. Modern portfolios often chase total return, blending growth stocks, index funds, and alternative investments that produce strong appreciation but very little traditional income. A trust built that way can generate excellent returns while leaving the income beneficiary with almost nothing to live on. The UFIPA provides two tools for that mismatch.
Power to Adjust
The power to adjust lets a trustee move money between principal and income when the default rules produce an unfair outcome. Under the UFIPA, the only requirement is that the trustee determine the adjustment will help administer the trust impartially, a simpler standard than the older uniform act imposed. The trustee weighs the grantor’s intent, each beneficiary’s financial needs, and whether the current investment strategy is producing a reasonable return for everyone.
If the trust holds mostly growth stocks or undeveloped land, the trustee might shift funds from principal to income so the current beneficiary isn’t starved. The reverse is possible too: if the trust is throwing off enormous income while principal erodes, the trustee can redirect some income back. Careful documentation of the reasoning matters. A beneficiary who feels shortchanged will want to see exactly why the trustee shifted money away from their account.
Unitrust Conversion
Instead of case-by-case adjustments, the trustee can convert to a unitrust. The income beneficiary then receives a fixed percentage of the trust’s total market value each year, regardless of what the assets actually earn. The tension between investing for income and investing for growth disappears.
The UFIPA gives trustees broad flexibility to set the unitrust percentage and define valuation methods through a unitrust policy. But for trusts that claim special tax benefits like the gift tax annual exclusion, the marital deduction, or S corporation eligibility, the rate must fall between 3% and 5%. Because most significant trusts involve at least one of those benefits, that 3% to 5% range is the practical standard.
Why Allocation Decisions Change the Tax Bill
Allocation isn’t just accounting. It drives who pays tax on trust earnings and at what rate. Trusts face the most compressed brackets in the federal system. In 2026, a trust hits the 10% bracket on its first $3,300 of taxable income, jumps to 24% above that, reaches 35% at $11,700, and pays 37% on everything over $16,000. An individual doesn’t reach that top rate until roughly $626,000. Getting income out of the trust and into a beneficiary’s hands almost always lowers the total tax.
When a trust distributes income, it claims an income distribution deduction that effectively shifts the tax burden to the beneficiary. The deduction is capped by Distributable Net Income. The beneficiary reports their share on their personal return, where wider brackets usually mean a lower rate. The character of the income carries through: interest stays interest, dividends stay dividends.
Trusts also owe a 3.8% Net Investment Income Tax on the lesser of undistributed net investment income or the amount by which adjusted gross income exceeds the threshold for the top bracket. In 2026 that threshold is $16,000, so nearly any trust holding investment income will owe it on retained earnings. Distributing income out cuts the trust’s exposure, though beneficiaries may owe the tax themselves depending on their own income.
Accounting to Beneficiaries
Beneficiaries are entitled to see how the allocation actually played out. Most states require a written report at least annually and at trust termination. The report has to cover the trust’s assets and liabilities, all receipts and disbursements during the period, the source and amount of trustee compensation, and the current market value of holdings where feasible.
The report should clearly identify which items were allocated to principal and which to income, whether any adjustments were made under the power to adjust, and how expenses were divided. A beneficiary reading it needs to be able to check the work. If the trustee refuses to provide an accounting after a proper request, beneficiaries can petition a court, which has authority to compel a full accounting, order distributions, or remove the trustee.
A thorough accounting also protects the trustee. Under the widely adopted Uniform Trust Code framework, a beneficiary who receives an adequate report typically has a shortened window to challenge the trustee’s actions. That window can be as short as six months from receipt if the disclosure was sufficient to alert the beneficiary to any potential claims. Without a proper report, the limitations period stretches to several years and doesn’t start running until the trustee is removed, the beneficiary’s interest ends, or the trust terminates.
What Happens When a Trustee Gets the Allocation Wrong
Misallocating between principal and income breaches the trustee’s duty of impartiality, and the consequences are personal. Courts apply a remedy called surcharge: the trustee pays out of their own pocket to put the injured beneficiary back where a correct allocation would have left them.
Impartiality doesn’t mean treating all beneficiaries equally. It means treating them equitably given the trust’s purposes. A trust designed primarily to support a surviving spouse may properly favor the income beneficiary over the remainder holders. What the trustee cannot do is manipulate investments or timing to steer receipts toward a favored party. Selling an asset with knowledge of a coming distribution specifically to influence which account receives the proceeds is the kind of act that triggers liability. The injured beneficiary can seek reimbursement from the trust or hold the trustee personally responsible for the value of the lost distribution.
Damages are measured by what the beneficiary would have received had nothing improper happened. Courts value the property at the time of the wrongful act, the date the distribution became fixed, or the date it was actually made, choosing the method that best captures the real harm. A trustee who acted dishonestly generally cannot reimburse themselves from trust funds even after paying damages. That is where the framework has teeth: an allocation decision that quietly favors one class of beneficiaries can end with the trustee writing a personal check.