Personal Loan vs. 401(k) Loan: Which Actually Costs Less?
Personal loan vs. 401(k) loan: compare total interest, opportunity cost, and job-loss risk before you decide which borrowing option actually costs less.
You have a 401(k) with a solid balance and a pressing expense. Borrowing from yourself rather than a bank has obvious appeal: no credit check, and the interest you pay comes back to your own account. But the total cost picture includes factors that complicate the apparent advantage significantly.
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How a 401(k) Loan Works
Under IRS rules, you can borrow up to 50% of your vested account balance or $50,000 — whichever is lower. Most plans set the interest rate at prime plus one percentage point. With the federal funds rate environment in early 2026, that puts most 401(k) loan rates in the 8.5%–10% range depending on your plan terms.
The interest you pay goes directly back into your account, which makes the stated rate look nearly free. Repayment happens automatically through payroll deductions, and most plans allow up to five years to repay. No credit check is required, and approval is typically automatic if you are vested and your plan allows loans.
One critical caveat: plans vary on whether you can take a second loan while a first is outstanding. Review your Summary Plan Description before assuming the full borrowing limit is accessible. The IRS overview of plan loan rules covers eligibility and repayment requirements in detail.
How Personal Loan Rates Are Set
A personal loan rate is fixed at origination based on your credit profile — credit score, debt-to-income ratio, income stability, and the lender's own pricing model. Borrowers with excellent credit often qualify for rates in the low-to-mid single digits; borrowers with fair credit may see 20%–28% or higher.
Unlike 401(k) loan interest, personal loan interest is paid to the lender permanently. Some lenders also charge origination fees that effectively raise your real APR well beyond the headline rate. That is why comparing the full APR — not just the stated rate — across multiple offers is essential before committing.
Interest Cost Comparison: $10,000 Over 36 Months
The chart below compares total interest paid across borrowing scenarios on a $10,000, 36-month loan. The 401(k) figure assumes a representative 9.5% plan rate; personal loan figures represent approximate market rates by credit tier.
The 401(k) route looks cheapest in raw interest terms. But those dollar figures do not yet account for the two largest risks: opportunity cost and the job-loss trap.
The Opportunity Cost Most Borrowers Overlook
When you borrow from your 401(k), those funds leave the market. Every dollar you withdraw earns your plan's loan interest rate instead of whatever the invested portfolio would have returned. If the market delivers 7% annualized during your repayment window — a common long-run equity benchmark — and you are paying 9.5% loan interest back to yourself, the net difference sounds favorable. But the interest only offsets the forgone return on the exact dollars you borrowed. The compounding on those dollars stops while the loan is outstanding, and compounding is what drives long-term retirement balances.
The practical outcome depends on what the market does during your specific repayment period, which cannot be predicted. In a strong equity run, the opportunity cost can exceed the stated interest savings compared to a personal loan. In a flat or declining market, borrowing from your 401(k) may genuinely be cheaper. The honest answer is that the advantage is real but uncertain in magnitude.
The Job-Loss Trap
This is the most consequential risk of 401(k) borrowing and the one most commonly overlooked when evaluating cost.
If you leave your employer — voluntarily or through a layoff — most plans require you to repay the outstanding loan balance within 60 to 90 days. If you cannot repay within that window, the unpaid balance is treated as a taxable distribution. You owe ordinary income tax on the entire amount, plus a 10% early withdrawal penalty if you are under age 59½.
On a $10,000 outstanding balance at a 24% combined federal and state marginal rate, an unplanned distribution could mean roughly $3,400 in taxes and penalties — turning a nominally cheap loan into one of the most expensive financial decisions you could make. A personal loan default damages your credit and may lead to collections, but it does not generate an immediate tax bill of this scale.
Employment stability is therefore a first-order input when comparing these two options — not an afterthought.
Which Option Fits Your Situation
Neither is universally better. Here is a framework for the decision:
A 401(k) loan tends to make more sense when:
- Your employment is very stable (long tenure, government role, or self-employed with your own plan)
- Your credit score would push a personal loan rate above 20%
- The loan term is short — 12 to 24 months — and you can repay before any job change risk
- Your plan charges no origination or administrative fee
A personal loan tends to make more sense when:
- Your credit qualifies you for a rate that narrows or closes the gap with your plan's loan rate
- There is any meaningful uncertainty about your employment over the next three to five years
- You need more than 50% of your vested balance, or your plan restricts concurrent loans
- You want to preserve full compounding on your retirement balance
Use the loan payment calculator to model total interest at different rate assumptions before deciding. If a personal loan is the right fit, comparing offers from multiple lenders is the most reliable way to find the rate your credit profile actually qualifies for — soft-pull prequalification lets you shop without affecting your score.
What to Do Next
If a personal loan fits your situation better than a 401(k) withdrawal, prequalification takes a few minutes and does not affect your credit score. Visit /get-started to compare offers from lenders in our network and see the rate you actually qualify for before you commit.