A 50/50 split looks fair on paper. After taxes, it often isn’t.
In almost every divorce case, assets and debts must be divided between the parties. Most practitioners know the legal framework: marital versus separate property, equitable distribution versus community property states. What gets less attention is the tax layer beyond the legal framework. Overlook taxes, and a division that looks balanced can leave one party at a significant disadvantage.
Equal Division Isn’t Always Fair
Whether the case calls for a strict 50/50 split or an equitable division under the facts, the goal is fairness. Because pre-tax value and after-tax value are two distinct numbers, looking only at pre-tax value may not give a fair result.
Consider two assets of identical value: a home and a traditional 401(k) account. Often a home may be sold completely tax-free under the IRC Section 121 exclusion. But the 401(k) when distributed will be taxed as ordinary income. If one party takes the home and the other takes the 401(k), the party who took the 401(k) today walks away with less after tax, even though the split looked equal on paper.
Or consider two investment accounts, each worth $100,000. Suppose one has a tax basis of $95,000, and the other has a basis of $20,000. The first generates minimal capital gains tax upon sale. The second triggers a substantial tax bill. Same market value, very different after-tax result.
These aren’t unusual cases. They show up in virtually every case that involves retirement accounts, appreciated real estate, or investment portfolios.
Start with Data: Organizing Assets for Tax Analysis
Accurate after-tax analysis starts with complete, accurate data collection. The law in most jurisdictions requires full disclosure of all assets and debts by each party. But tax analysis requires another layer of data.
For each asset, two numbers are critical:
Market value is the current fair market value of the asset. For publicly-traded investments, this is the current price per share multiplied by the number of shares owned. This is typically shown on the most recent account statement.
Tax basis is what was paid for the asset. Tax basis generally equals the original cost plus expenses such as commissions and sales taxes. For assets other than securities, the basis increases for capital improvements and decreases with depreciation and insurance reimbursements. For appreciated assets, the gap between basis and current value is where the tax liability lives.
Family Law Software enables you to capture all this information. For each asset entered, practitioners can enter the tax basis. They can also designate the marital and separate portions, flag assets as entirely separate property, or tag assets as belonging to a child.
In cases with real estate to be sold, FLS will create a report with the expected income, gain, and tax on sale of property.
For securities, you can see a report showing, for the current proposed property division, the amount of untaxed gain that each party is taking on.
Why After-Tax Analysis Changes the Division
Properties with built-in tax consequences that appear most frequently in divorce cases include:
- Traditional IRA and 401(k) accounts — distributed as ordinary income in retirement.
- Defined benefit pension plans — taxed as ordinary income upon receipt.
- Appreciated real estate — taxable if there are gains above the Section 121 exclusion amount.
- Appreciated investment accounts — subject to capital gains tax on sale.
In mediation, collaboration, or negotiated settlement contexts, the after-tax picture is essential. In litigation, courts generally won’t engage in this kind of tax projection. But when the parties have room to negotiate, getting to a genuinely fair division requires doing this analysis.
How Family Law Software Handles After-Tax Division
Family Law Software is the only program that tax-effects a proposed marital property division on an asset-by-asset basis. Practitioners access this through Analysis > Property After-Tax.
The software handles each asset class differently.
- Real estate uses actual sale data if a sale is specified; otherwise it assumes a current-year sale and can apply the Section 121 exclusion.
- Investment assets with dividend income are assumed sold currently, with gain calculated from basis.
- Bond-type assets (interest-bearing) are assumed to have no gain or loss.
- Retirement accounts are assumed distributed in retirement at the projected marginal rate.
The screen is organized into four working sections:
1. Key Tax Rates Used. The software calculates two rates: the ordinary income tax rate that will apply in retirement (for IRAs, 401(k)s, and defined benefit pensions) and the current capital gains rate (for real estate and investment accounts). Both are derived from the projections already in the case file and can be overridden. Users must understand that these are educated guesses — particularly the retirement tax rate as this is a future event and the parties could have a very different financial position at that time. Users may override these numbers to supply better guesses as to what these rates will be.
2. Percent Paid in Tax. For each asset, the software calculates what percentage of the asset’s total value will be consumed by taxes upon sale or distribution.
For example: a stock worth $10,000 with a basis of $8,000 and a 15% capital gains rate generates $300 in tax. This is calculated as (capital gain * capital gains tax rate), which is ($10,000-$8,000) * 0.15. (The after-tax value is (pre-tax value – tax), which in this case is $10,000 – $300 = $9,700.)
The percent paid in tax is (tax paid / total value). In this case, that is $300 / $10,000 = 3%. This approach allows direct comparison across asset classes on a consistent basis.
The software calculates the percent paid in tax for each asset. The percent paid in tax that the software calculates for each asset may also be overridden.
3. Marital Property Division on an After-Tax Basis section shows the current proposed division of the marital estate after taxes, that is, what percent of the value of each property is being kept by each party. The section highlights the total dollar and percent of marital equity retained by each party.
No Equalization Payment — by Design. The after-tax screen does not show an equalization amount. This is intentional. An after-tax equalization figure tells practitioners that the parties are, say, $20,000 apart in after-tax value, but it doesn’t indicate how much pre-tax property needs to move to close that gap. Why not? Because the answer depends on the tax rate of each asset. If an asset has a high rate of tax payable, it will take more of that asset to achieve an after-tax equalization than if an asset with a low rate of tax payable is used. This makes it impossible to calculate a single equalization payment number. Instead, practitioners can adjust the ownership percentages by trial and error until the after-tax totals reach the desired division.
4. After-Tax Property Division Worksheet. This is the core tool. The worksheet mirrors the “Divide Property” worksheet but includes a column for after-tax values for each party. Practitioners adjust the ownership percentage for each asset, and the after-tax totals update instantly. The calculation for each party follows this logic: after-tax equity = pre-tax equity × percent of asset kept by party × (1 – % paid in tax). A party receiving 50% of a $10,000 asset with a 5% tax rate ends up with $10,000 * 50% * (1-0.05) = $4,750 after tax.
Family Law Software Has You Covered
Dividing marital property without considering taxes is like equally splitting a restaurant check without accounting for who ordered the appetizers and the chef’s most expensive dish. Splitting the bill evenly seems fair until someone actually pays.
Family Law Software builds the entire after-tax framework directly into the property division workflow. Enter the assets accurately with a tax basis and the software does the analysis, asset by asset, with every assumption visible and every rate adjustable.
Helpful Resources:
Family Law Software Power Webinar ‘Property Division’: https://www.youtube.com/watch?v=VEYp-eRvY68
IRS Topic no. 703, Basis of assets: https://www.irs.gov/taxtopics/tc703
IRS Publication 551 (12/2025), Basis of Assets: https://www.irs.gov/publications/p551