Instructions for Creating Pre-Tax Asset Tranches

When an estate includes pre-tax assets — traditional IRAs, 401(k)s, or other deferred accounts — dividing them equally by dollar amount is rarely fair. A $100,000 IRA is not worth the same to every beneficiary, because each household will pay a different marginal tax rate when they withdraw. The goal of tranching is to match pre-tax distributions to the tax situation of the household receiving them, so the after-tax value is as equitable as possible.

The process below walks through how to divide pre-tax assets into appropriately-sized tranches, apply the right marginal tax discount to each, and prepare them for the final allocation or solving process.

Step 1: Determine each household's income

For each second-generation household, establish their current taxable household income. Use that income to identify which federal marginal tax bracket they currently occupy. This is the baseline from which you'll calculate available bracket room.

Step 2: Identify the household with the lowest income

Start with the household that has the lowest current taxable income — they have the most room left in their bracket and will receive the most favorable treatment on pre-tax distributions. Determine how much additional income that household can receive before crossing into the next tax bracket.

Step 3: Calculate the first tranche size

Multiply that available bracket room by 10. This represents approximately 10 years of annual distributions before the household would be fully pushed into the next bracket.

For example, if the household has $40,000 of room remaining in its current bracket:

$40,000 × 10 = $400,000

That $400,000 is the size of the first tranche.

Step 4: Create the first pre-tax asset tranche

Create a pre-tax asset (or group of pre-tax assets) equal to that tranche size. Apply a bid adjustment — or valuation discount — that reflects the marginal tax rate the lowest-income household currently pays. This discount converts the nominal pre-tax value into an after-tax equivalent for purposes of fair comparison.

Step 5: Assume the first tranche has been assigned

For calculation purposes, assume the lowest-income household receives that first tranche. This effectively moves them into the next tax bracket — their income is now treated as if it has been increased by the annual distributions from that tranche. This assumption drives the sizing of every subsequent tranche.

Step 6: Recalculate available bracket room

Now that the lowest-income household is assumed to be operating in the next bracket, determine how much room remains in that new bracket before they would move into the one above it. Multiply that amount by 10 to get the next tranche size.

Step 7: Create the next pre-tax tranche

Create another pre-tax asset tranche using the newly calculated amount. Apply a bid adjustment that reflects the household's new assumed marginal tax rate — which is now higher than it was in Step 4. Continue building tranches at successively higher discount rates as the assumed bracket climbs.

Step 8: Include multiple households when applicable

If more than one household falls within the same tax bracket for a given tranche, include each household's remaining bracket room in that tranche's calculation. For each qualifying household, compute:

Remaining bracket room × 10

Then sum those amounts together to set the tranche size. Each household's contribution to the tranche reflects how much pre-tax income they can absorb at the current marginal rate before being pushed higher.

Step 9: Repeat until all pre-tax assets are assigned

Continue working through the process — bracket by bracket, household by household — until all pre-tax assets have been allocated to a tranche. Each tranche should carry its own marginal tax discount that accurately represents the cost of receiving those funds for the household or households expected to absorb them.

The result is a set of pre-tax tranches with progressively higher discounts, each sized to match the realistic tax exposure of the recipients at that level of income.

Step 10: Prepare the pre-tax accounts for solving

Once all pre-tax assets have been divided into properly discounted tranches, they are ready to be entered into the allocation or solving process. Because each tranche carries a tax-adjusted value, the solver can treat them like any other asset — comparing them fairly against real property, cash, and after-tax investments — without understating the true cost to each beneficiary.

This approach ensures that the beneficiary who receives a large pre-tax account isn't treated as if they received its face value. The discount does the work of aligning nominal asset amounts with real economic benefit.