401(k) loans and your QDRO share: gross, net, and the traps between

An outstanding plan loan quietly changes what “50% of the balance” means — by exactly half the loan. Plans publish precise rules for this, including a silent-order default most people don't expect, two ways to get the order rejected, and one thing a QDRO can never do with a loan.

Roughly one input in the division of a 401(k) gets overlooked more than any other, and it is usually sitting in plain sight on the account statement: the outstanding loan. Our cornerstone guide to dividing retirement accounts in divorce lists “forgetting loans” among the mistakes that cost real money. This guide is the full accounting of why — with the plan-published rules that decide the question when the order is silent.

First, what the thing actually is.

What a 401(k) loan actually is

A plan loan is the participant borrowing from their own account. Under IRC §72(p), as the IRS explains, plans may lend up to 50% of the vested balance capped at $50,000, generally repayable within five years through level payments at least quarterly (longer terms are allowed for a principal residence, and IRAs cannot make loans at all).

The accounting is the part that matters for divorce. When the participant borrows $10,000, the plan sells $10,000 of investments and hands over cash; in their place sits a promissory note from the participant to their own account. Recordkeepers therefore show two numbers: the vested liquid balance, and the outstanding loan balance as a separate line — the participant's total interest in the plan is the sum of both. Every drafting question about loans reduces to one choice: which of those two numbers does the split percentage apply to?

Gross vs. net: the half-a-loan question

The Microsoft 401(k) plan's QDRO guidelines, administered by Fidelity, put the whole issue in one worked example. Vested liquid balance on the valuation date: $100,000. Outstanding loan: $10,000. The order awards the alternate payee "50% of the participant's vested account balance":

• If the order says nothing about loans — or says the loan is excluded — the award is 50% of $100,000: $50,000.
• If the order says the loan balance is included, the award is 50% of $110,000: $55,000.

The swing is always half the loan (at a 50% split), and which reading is fair is a genuine question, not a technicality. If the loan proceeds paid for marital spending — the roof, the tuition, the joint vacation — both spouses enjoyed the money, and including the note in the divisible balance makes the participant's repayment burden a shared one in substance. If the loan funded something separate, excluding it leaves the borrowing where it belongs. The settlement should decide this consciously; the QDRO should just record the decision.

What the QDRO must never do is try to hand the loan itself to the alternate payee. The published rule is categorical: "There will be no transfer of the Participant's loan liability to the Alternate Payee" — any order attempting it is non-qualified. The debt follows the borrower; only the arithmetic is negotiable.

The plan's rules when the order is silent — or wrong

The same published guidelines spell out the machinery, and large recordkeepers run on very similar rules:

• Silent order → loan excluded. If the order doesn't mention loans, the outstanding loan balance "will not be included" in the account balance being divided. The silent default favors the participant by half the loan.
• The award is paid from liquid assets. The alternate payee's share comes out of the non-loan assets of the account — nobody receives a slice of a promissory note.
• Insufficient liquid assets → non-qualified. If the loan is large enough that the liquid balance can't cover the award, the order bounces. A 50% award "including loans" on an account that is mostly loan is an order that cannot be executed.
• Unclear loan treatment → non-qualified. Ambiguity is itself a defect — one of the operational rejection reasons we catalog in the rejected-QDRO guide.

The cure is almost embarrassingly simple. The plan publishes the exact sentence, in two flavors: "In the event that there is an outstanding loan balance as of the Valuation Date, the loan balance WILL [or WILL NOT] be included for purposes of calculating the account balance to be divided." The plan's own QDRO form presents it as a checkbox — one of those model-language defaults worth checking against your settlement instead of accepting blind.

Defaults, job changes, and why segregation speed matters

A plan loan that stops being repaid becomes a deemed distribution: the outstanding balance is taxed to the participant as income, plus the 10% additional tax if they are under 59½ and no exception applies. Two divorce-specific consequences follow:

• The tax lands on the participant — a default cannot create a tax bill for the alternate payee, because the loan was never theirs.
• But the account damage is real while the money is still commingled. Until the alternate payee's award is segregated into its own account, a default, a withdrawal, or a job change with a loan offset all shrink the same pool the award must be paid from. That is one more reason the calendar in our QDRO timeline guide is not a formality — and note that once the plan receives the order, a disbursement restriction typically blocks the participant from taking new loans or withdrawals while review is pending.

Pair the loan clause with its two companions — the valuation date and the gains-and-losses election. The three together define exactly what the alternate payee's dollars are, on what date, adjusted how. The 401(k) split calculator lets you set all of it — balance, loan, market move, and split — and see each side's number before anyone signs.

The drafting checklist

Frequently asked questions