Personal Loan vs. 401(k) Loan: Which One Actually Costs You More?

The quick answer

On paper, a 401(k) loan is the cheapest money most working Americans can access. The typical rate is prime plus one point — around 8.5% in 2026 — there's no credit check, no hard inquiry, and the interest you pay goes back into your own account rather than to a lender. Compared with a personal loan at 6.99%–24.99% APR, it looks like an easy win.

It usually isn't. The stated rate is the smallest part of a 401(k) loan's cost. The real price tag is opportunity cost: every dollar you pull out stops compounding the moment it leaves the account, and it never catches up. Over a working lifetime, a five-year $25,000 401(k) loan can quietly cost $60,000 to $90,000 in retirement balance you'd otherwise have had.

The honest framing is this. A personal loan costs more money today in visible interest. A 401(k) loan costs more money later in invisible growth, and it adds a risk a personal loan doesn't have: if you lose your job, the balance can convert into a taxable distribution with a 10% early-withdrawal penalty. For most borrowers with a payoff horizon longer than a year, the personal loan is the safer and — measured across your whole financial life — often the cheaper choice.

There are real exceptions, and we cover them below. Short payoff windows, very stable employment, and thin or damaged credit all shift the math toward the 401(k). The point of this guide is to give you the actual numbers so you can tell which situation you're in.

How each loan actually works

A 401(k) loan is you borrowing from yourself. IRS rules cap the amount at the lesser of $50,000 or 50% of your vested balance, and repayment must generally happen within five years through automatic payroll deduction (longer if the money buys a primary residence). Your plan administrator sells investments to fund the loan, so those shares leave the market on the day the check is cut. Repayments buy shares back gradually — at whatever prices the market is charging then.

There's no credit check because there's no credit risk to the plan: your own balance is the collateral. Most plans charge a $50–$100 origination fee plus a small annual maintenance fee, and many limit you to one or two loans outstanding at a time. Critically, some plans suspend your ability to make new contributions while a loan is outstanding — and if you stop contributing, you also stop receiving the employer match, which is a straight pay cut.

A personal loan is unsecured installment credit from a lender. You receive a lump sum, repay it over 24–84 months at a fixed APR, and the money is yours to use for debt consolidation, medical bills, home repairs, moving, or nearly any personal purpose. Approval is based on credit score, income, and debt-to-income ratio rather than on your retirement balance.

The structural difference that matters most: a personal loan is a contract between you and a lender, entirely separate from your employment. A 401(k) loan is a contract tied to your job. That single fact drives most of the risk difference between the two products.

The true cost of a 401(k) loan: compound growth you never get back

Run the numbers on a realistic case. You're 35 years old, you borrow $25,000 from a 401(k) invested at a 7% average annual return, and you repay it over five years at 8.5%. The interest you pay — about $5,700 — goes back into your own account, so on a pure cash basis the loan looks close to free.

But those investments were out of the market. Had $25,000 stayed invested at 7%, it would have grown to roughly $35,000 over the five-year loan term. Your repayments put the principal back plus $5,700 in interest, so you're about $4,300 short at the moment the loan closes. That gap doesn't stay small — it keeps compounding for the rest of your career. At 7% over the 25 years remaining to age 65, that $4,300 shortfall grows into roughly $23,000 of retirement balance you will never have.

Now add the contribution problem. Many borrowers reduce or pause 401(k) contributions while repaying a loan, because the payroll deduction squeezes their budget. Suppose you cut contributions by $300 a month for the five-year term and lose a 50% employer match on that amount. That's $450 a month of retirement funding gone for 60 months — $27,000 in foregone contributions and match, which at 7% for the following 25 years is worth well over $150,000 at retirement.

Compare that with a personal loan. Borrow the same $25,000 for five years at 14.99% APR and you'll pay about $595 a month and roughly $10,700 in total interest. That's real money, and it's more than the 401(k) loan's stated interest. But your retirement account keeps compounding untouched the entire time, and nothing about the loan can be accelerated by a change in your employment.

The comparison that matters isn't $5,700 versus $10,700. It's $10,700 of visible interest versus $23,000 or more of invisible retirement erosion — with the possibility of six figures if the loan disrupts your contributions and match.

Side-by-side: 401(k) loan vs. personal loan in 2026

Typical rate: 401(k) loan runs prime + 1%, about 8.5% in 2026, paid back to yourself. Personal loans through The Lending Group network run 6.99%–24.99% APR paid to the lender. Strong credit narrows that gap considerably — a 720+ FICO borrower can land close to the 401(k) rate without touching retirement savings.

Maximum amount: 401(k) loans are capped at the lesser of $50,000 or 50% of your vested balance, so a $40,000 balance limits you to $20,000. Personal loans in our network run from $2,500 up to $100,000 depending on income and credit — not tied to what you've saved.

Term: 401(k) loans must generally be repaid within five years. Personal loans run 24 to 84 months, which means you can stretch payments lower if cash flow is tight or compress them to save interest.

Approval and speed: 401(k) loans require no credit check and typically fund in 3–10 business days through your plan administrator. Personal loans require a credit and income review; checking your rate with us is a soft pull only, and most approved loans fund in 1–3 business days.

Credit reporting: 401(k) loans don't appear on your credit report at all — no inquiry, no tradeline, no payment history, and no score benefit. Personal loans report to the bureaus, which builds payment history and, when used to pay off cards, lowers revolving utilization.

Risk on job change: this is the asymmetry. Leave or lose your job with a 401(k) loan outstanding and the balance is typically due by your federal tax filing deadline for that year. A personal loan is unaffected by employment changes — the payment schedule simply continues.

Fees: 401(k) loans usually carry a $50–$100 setup fee and small annual maintenance. Personal loans may carry an origination fee of 0%–8% depending on the lender, disclosed before you sign, and loans in our network have no prepayment penalty.

The double-taxation question, settled

You'll read constantly that 401(k) loans are 'double taxed.' The claim is that you repay the loan with after-tax dollars, then pay tax again when you withdraw in retirement. It's a real effect, but it's routinely overstated, and it only applies to the interest portion — not the principal.

Here's why. The principal you borrowed was pre-tax money that left the account untaxed, and you're returning it with after-tax dollars, so on the principal you're roughly neutral over the life of the loan. The interest is different: you earn it, pay income tax on it, put it into a traditional 401(k), and then pay income tax on it again at withdrawal. On $5,700 of interest at a 22% marginal rate, the genuine double-tax cost is roughly $1,250 spread across decades.

That's real but modest — and it's dwarfed by the compound growth loss described above. If you're deciding between products, don't let the double-taxation argument do the heavy lifting. Focus on opportunity cost and job-loss risk, which are an order of magnitude more consequential.

One caveat worth knowing: if a 401(k) loan defaults and becomes a deemed distribution, the tax picture changes sharply for the worse. The outstanding balance is added to your ordinary income for the year and, if you're under 59½, hit with an additional 10% early-withdrawal penalty.

Job-loss risk: the reason most advisors say no

This is the single biggest practical difference between the two products, and it's the one borrowers most often discover too late.

If you leave your employer — voluntarily or not — with a 401(k) loan outstanding, the remaining balance generally becomes due by the due date of your federal tax return for the year you left, including extensions. The 2017 tax law extended that window from the old 60-day rule, which helped, but it's still a hard deadline arriving at the worst possible moment.

If you can't repay, the balance is treated as a distribution. Say you're laid off with $18,000 outstanding at age 40 and can't come up with the cash. That $18,000 is added to your taxable income for the year — potentially pushing you into a higher bracket — and you owe a 10% early-withdrawal penalty on top. At a 22% federal rate plus 5% state plus the penalty, you'd owe roughly $6,700 in taxes and penalties on money you already spent, in the same year you lost your income.

The risk compounds because job loss and financial stress correlate. The scenarios where you most need liquidity are the same scenarios where a 401(k) loan turns hostile. A personal loan does the opposite: the payment stays the same whether you're employed, between jobs, or self-employed, and if you're struggling, hardship and deferment options are negotiable with the lender.

If your employment is genuinely stable — tenured, government, long-tenured corporate role in a healthy sector — this risk is small and shouldn't dominate your decision. If your industry is cyclical, your company is restructuring, or you've been in the role under two years, weight it heavily.

Credit score impact: invisible versus constructive

A 401(k) loan is invisible to the credit bureaus. There's no inquiry when you take it and no tradeline while you repay it. That's an advantage if you're about to apply for a mortgage and want your credit report untouched, and it's a disadvantage if you're trying to build credit history — 60 months of perfect repayment earn you nothing.

Mortgage lenders are a nuance worth flagging. The loan won't appear on your credit report, but the payroll deduction does show on your pay stubs, and underwriters routinely count the payment in your debt-to-income calculation. Don't assume a 401(k) loan is free of underwriting consequences just because it's not on your report.

A personal loan is reported and does real work for your score. On-time payments build payment history, which is 35% of your FICO score. If you're using the loan to consolidate credit cards, the effect is bigger: personal loans are installment debt and don't count toward revolving utilization, so paying off card balances typically drops utilization sharply and adds 20–40+ FICO points within one to two billing cycles.

One clarification specific to our platform: checking your personal loan rate with The Lending Group is a soft credit pull. There's no hard inquiry to qualify and no score impact from seeing your options. If you move forward and a funding lender runs a hard pull at closing, it typically costs 5–10 points for a few months.

When a 401(k) loan is the better choice

Short payoff windows. If you'll clear the balance in under 12 months — a bridge to a bonus, a home sale, or a delayed insurance settlement — the compound growth loss is small and the cheap rate genuinely wins. The damage scales with time out of the market.

Damaged or thin credit. If your credit puts your best personal loan offer above 20% APR, an 8.5% 401(k) loan is a meaningfully cheaper way to borrow. Compare your actual soft-pull quote against the plan rate before assuming this applies to you — many borrowers overestimate how bad their offers will be.

Highly stable employment. Government, tenured academic, or long-tenured roles in a stable sector materially reduce the job-loss risk that makes advisors cautious.

You are near or over 59½. Past that age the 10% early-withdrawal penalty no longer applies to distributions, which removes the harshest consequence of a default.

Avoiding a hard inquiry before a mortgage. If you're weeks from a mortgage underwriting decision, keeping your report untouched has real value — just remember underwriters will still see the payroll deduction.

In every one of these cases, one rule holds: keep contributing at least enough to capture the full employer match while the loan is outstanding. Losing the match is the fastest way to turn a cheap loan into an expensive one.

When a personal loan is the better choice

You need more than your plan allows. The 50%-of-vested-balance cap bites hard for younger savers. A 32-year-old with $40,000 saved can only borrow $20,000; a personal loan can go well beyond that based on income.

You need a term longer than five years. Personal loans run up to 84 months, which can cut the monthly payment by 30% or more versus a compressed five-year 401(k) repayment. Lower payments mean you're far less likely to cut retirement contributions to make room.

You're consolidating credit card debt. This is the highest-leverage use of a personal loan: you collapse variable card APRs into one fixed payment, fix the utilization drag on your score, and leave retirement savings compounding. Our debt consolidation loans page walks through the mechanics.

Your job isn't rock-solid. Cyclical industry, recent restructuring, under two years of tenure, or commission-heavy income all argue for a loan that can't be accelerated by a layoff.

You're more than 15 years from retirement. The longer the runway, the more punishing the compound growth loss. At 35, a five-year loan compounds its damage for three more decades; at 58, it doesn't.

You want the credit benefit. If part of the goal is a better score before a future mortgage or auto purchase, only the personal loan builds a payment history that lenders can see.

Five costly mistakes borrowers make

Pausing 401(k) contributions during repayment. This is the most expensive mistake on the list and the most common. Losing the employer match while repaying can cost more than the entire loan. Cut anywhere else first.

Comparing only the interest rates. 8.5% versus 14.99% is not the comparison. Total lifetime cost including foregone growth is the comparison, and it frequently reverses the answer.

Assuming you'll never change jobs. Median US job tenure is about four years — shorter than the five-year 401(k) repayment term. Plan for the possibility, not the intention.

Taking a 401(k) loan to pay off credit cards, then re-running the cards. Without closing the behavior loop you end up with card debt and a depleted retirement account. If consolidation is the goal, pair it with a written plan for the cards.

Never checking the personal loan option because you assume your rate will be terrible. A soft-pull quote takes about two minutes and costs nothing. Many borrowers find their real offer is far better than they feared.

Key takeaways

• The 8.5% rate on a 401(k) loan is not the real cost — foregone compound growth is, and it often runs 2–5x the interest on a comparable personal loan.
• A $25,000 five-year 401(k) loan at age 35 can cost roughly $23,000 in retirement balance by 65 — and six figures if it disrupts contributions and employer match.
• Leaving your job makes a 401(k) loan balance due by your tax filing deadline; unpaid, it becomes taxable income plus a 10% penalty under 59½.
• Personal loans cost more in visible interest but protect retirement savings, build credit, and are immune to employment changes.
• 401(k) loans make sense for payoff windows under a year, very stable employment, borrowers over 59½, or when credit pushes personal loan APRs above 20%.
• Never pause 401(k) contributions to repay a loan — losing the employer match usually costs more than the loan saves.
• Checking your personal loan rate with The Lending Group is a soft credit pull with no score impact, so you can compare both options with real numbers.

Frequently asked questions

Sources & further reading

• Retirement Topics — Plan Loans — Internal Revenue Service
• Considering a loan from your 401(k) plan? — FINRA
• What you should know before borrowing from your retirement plan — Consumer Financial Protection Bureau
• Selected Interest Rates (Bank Prime Loan Rate) — Federal Reserve

Editorial policy: content reviewed by a licensed lending professional. We do not make credit decisions; final rates and approvals come from our lending partners. See our editorial standards.