A Vanguard 401(k) loan lets you borrow from your own plan balance when your employer's plan permits it. The IRS caps the loan at the lesser of $50,000 or 50% of your vested balance, repaid over five years through payroll deductions. For a high earner with taxable assets, it is usually a last resort.
Key takeaways
- Vanguard is a recordkeeper for thousands of employer plans. Loan availability is set by your plan documents, not by Vanguard, and not every plan allows loans.
- The federal limit is the lesser of $50,000 or 50% of your vested balance. Some plans let you borrow up to $10,000 even when that tops half your balance, but they do not have to.
- Standard repayment is five years of at least quarterly, level payments. Loans used to buy a primary residence can run longer.
- Interest is typically prime plus 1% and it goes back into your own account, not to a bank.
- Leave or lose your job and the outstanding balance is generally due by your federal tax filing deadline (including extensions) for that year, or it becomes a taxable distribution plus a 10% penalty under age 59 1/2.
- The "double taxation" scare is mostly a myth. Only the interest is genuinely taxed twice, and it is a small number relative to the real cost, which is lost market growth.
How a Vanguard 401(k) loan works
Borrowing from a 401(k) is not a withdrawal. You take money out of your own account and repay it with interest on a fixed schedule, so there is no tax and no early-withdrawal penalty as long as you stay current. Because you are lending to yourself, the interest lands back in your account rather than in a lender's pocket.
Two things control whether you can do this at all. First, your employer's plan document has to allow loans; plenty do not. Second, you need enough vested balance to support the amount you want. Vanguard administers the mechanics, but the terms, limits, and even whether loans exist come from the plan your employer designed. Never assume a feature applies to your plan without checking your specific plan documents or the Vanguard participant site.
Vanguard 401(k) loan rules at a glance
| Rule | What applies |
|---|---|
| Maximum amount | Lesser of $50,000 or 50% of vested balance. Some plans allow up to $10,000 even if above 50%. |
| Minimum | Set by your plan (often around $1,000). |
| Repayment term | Up to 5 years; longer if used to buy a primary residence. |
| Payment schedule | Level payments, at least quarterly, usually via payroll deduction. |
| Interest rate | Commonly prime plus 1%; paid back into your own account. |
| Number of loans | Plan-specific; many plans cap outstanding loans at one or two. |
| Plan must permit | Yes. Loans are optional and set by plan documents, not guaranteed. |
| Tax on the loan | None, as long as payments stay current and terms are met. |
The $50,000 ceiling is also reduced by your highest outstanding loan balance from the prior 12 months, which can trip up anyone who recently repaid one loan and wants another.
Repayment and what happens if you leave
Repayments come straight out of your paycheck on your normal pay cycle, so staying current is largely automatic while you are employed. You can also prepay the balance early with no penalty.
The risk concentrates on one event: separating from your employer. If you leave, quit, or get laid off before the loan is repaid, the unpaid balance does not vanish. You generally have until the due date of your federal income tax return for that year, including extensions, to either repay it or roll the offset amount into an IRA or new employer plan. Miss that window and the balance is treated as a distribution: ordinary income tax, plus a 10% early-withdrawal penalty if you are under 59 1/2. In a bad year, a job loss and a tax bill can arrive together, which is exactly when the cash is hardest to find.
The double-taxation myth, handled honestly
The common claim is that a 401(k) loan gets taxed twice because you repay it with after-tax dollars and then pay tax again at withdrawal. For the principal, this is not really true. The money you borrowed was never taxed on the way out, and repaying a loan with post-tax income is what happens with any loan you have ever taken. There is no extra layer on the principal.
The interest is the honest exception. You pay it with after-tax dollars, it lands in your pre-tax account, and it gets taxed again when you eventually withdraw it. So the interest alone is taxed twice. On a $40,000 loan at prime plus 1% over five years, that double-taxed slice is modest and is not the real reason to avoid the loan.
Is it ever a good idea for a high-net-worth saver?
For a FIRE-track or high-net-worth household, a 401(k) loan is usually the wrong tool, and the reason is opportunity cost, not the tax noise.
| Pros | Cons |
|---|---|
| No credit check, fast funding | Borrowed dollars leave the market and stop compounding |
| Interest paid to yourself, not a bank | Full balance can come due if you leave your job |
| No tax or penalty while current | Interest portion is genuinely taxed twice |
| Rate often beats credit cards | Contributions sometimes pause during repayment, costing you the employer match |
The core problem is that the borrowed amount is out of the market for the life of the loan. Pull $40,000 during a strong run and the missed growth dwarfs the interest you pay yourself. Layer on the job-loss trigger and, for some plans, a paused contribution match, and the math rarely favors it.
If you have a taxable brokerage account, a HELOC, or other liquidity, those almost always beat raiding tax-advantaged compounding. A plan loan makes sense mainly in a narrow case: a short, defined need, high confidence you will stay at the job through repayment, and no cheaper liquid capital sitting elsewhere. For most people reading this, that combination is rare.
Before you borrow, weigh it against the alternatives. A Vanguard hardship withdrawal covers a narrow set of emergencies but is taxed and permanently shrinks your balance, while a standard Vanguard withdrawal may be penalty-free once you reach 59 1/2. For the wider view of how a plan loan fits your long-term picture, see our retirement planning hub and the full Vanguard resource guide.
Bottom line
A Vanguard 401(k) loan is cheap on paper and expensive in practice. The IRS rules are simple: half your vested balance or $50,000, five years, payroll repayment, and a hard deadline if you leave your job. The tax scare is overblown, but the lost compounding is real. If you already have liquid assets outside your retirement accounts, use those first and let the 401(k) keep working.