How to Choose Between a 401(k) Loan vs. Personal Loan

When you need money fast, two of the most common options people consider are borrowing from their 401(k) or taking out a personal loan.

Both can get you cash relatively quickly, but they work in very different ways and come with very different consequences. Understanding those differences is what makes the choice manageable.

In this post, we'll walk through how each option works, what they cost, and which one makes sense depending on your financial situation. Let's jump in.

401(k) loan vs. personal loan: which should you choose?

The right choice between a 401(k) loan and a personal loan depends mainly on your credit profile, how urgently you need funds, and how comfortable you are pausing your retirement growth.

A 401(k) loan is generally the better option if your credit is poor and you need a lower interest rate. A personal loan is usually the smarter move if you have decent credit and want to protect your long-term retirement savings.

That said, this decision has a lot of nuance. Here's a breakdown of each option before diving into the comparison.

What is a 401(k) loan?

A 401(k) loan is effectively borrowing money from your own retirement account, with a promise to pay it back with interest.

Unlike a withdrawal, a 401(k) loan does not trigger income taxes or the 10% early withdrawal penalty, as long as you repay it on time. The IRS generally allows you to borrow up to 50% of your vested account balance, or $50,000, whichever is lower.

Repayment typically happens through automatic payroll deductions over a period of up to five years. The interest you pay goes back into your own account, which can make the loan feel "free" on the surface.

This said, the real cost is the lost investment growth on the money you borrowed. Every dollar sitting outside your 401(k) is a dollar not compounding for your retirement.

How 401(k) loan repayment works

Repayment is structured as regular installments over a set term, usually up to five years.

If you leave your job, voluntarily or otherwise, the remaining loan balance is typically due in full within 60 to 90 days. If you can't repay it in time, the outstanding balance is treated as a distribution and becomes subject to taxes and the early withdrawal penalty.

This means your employment situation is directly tied to the risk of your 401(k) loan, which is something every individual who takes one out should think carefully about.

What is a personal loan?

A personal loan is effectively a fixed-sum loan from a bank, credit union, or online lender that you repay in monthly installments over a set term.

Personal loans are unsecured, meaning they don't require collateral, and lenders mainly use your credit score, income, and debt-to-income ratio to determine your eligibility and interest rate. Rates can range broadly, be it a single-digit APR for borrowers with excellent credit or upwards of 30% for those with poor credit.

The loan term usually ranges from one to seven years, and once you're approved, the funds are deposited directly into your bank account. Unlike a 401(k) loan, a personal loan has no connection to your retirement savings or employment status.

Luckily, personal loans are widely available and can often be funded within one to three business days. Just make sure you shop around and compare APRs, not just monthly payment amounts.

Key differences between a 401(k) loan and a personal loan

Here's a breakdown of how the two options compare across the factors that matter most.

Interest rates

The interest rate on a 401(k) loan is usually set at the prime rate plus one or two percentage points, which is typically much lower than what most personal loan lenders offer.

This said, the interest "savings" can be misleading since you're essentially paying yourself back while missing out on market returns. If your investments would have grown at 8% annually, paying yourself 5% interest is still a net loss.

Credit score impact

A 401(k) loan does not require a credit check and does not appear on your credit report, so it won't help or hurt your credit score.

A personal loan, on the other hand, requires a hard inquiry at the time of application, which can temporarily lower your score by a few points. On the positive side, making on-time payments on a personal loan can actively build your credit history over time. If you're working on your credit, pairing financial tools like a Kikoff plan with on-time personal loan payments can compound your credit-building progress.

Risk to retirement savings

This is basically the single most underestimated cost of a 401(k) loan.

Every dollar you borrow stops compounding inside your account. If you borrow $20,000 for five years from an account that would otherwise grow at 7% annually, you miss out on roughly $6,000 to $8,000 in growth, depending on market conditions. That's real money that doesn't come back.

Employment risk

If you lose or leave your job while carrying a 401(k) loan, the full balance is usually due within 60 to 90 days.

Failing to repay it means the IRS treats the outstanding balance as a taxable distribution, and if you're under 59½, you'll also owe a 10% early withdrawal penalty. For every individual who is even slightly uncertain about their job security, this risk deserves serious weight.

When a 401(k) loan makes sense

There are specific situations where a 401(k) loan is the more practical choice.

It makes the most sense when your credit score is too low to qualify for a reasonable personal loan rate, or when you're facing a genuine financial emergency and need fast access to funds without a credit check. If you have a stable job with no near-term plans to leave and can commit to the repayment schedule through payroll deductions, the risk profile improves considerably.

Some people use 401(k) loans to avoid high-interest debt like credit cards, which is generally a sound idea if you can repay the loan quickly. Basically, the shorter the loan term, the less retirement growth you sacrifice.

Just make sure you're not depleting a retirement account that you'll urgently need in fewer than five to ten years.

When a personal loan makes sense

A personal loan is usually the smarter path if you have a credit score that qualifies you for a competitive rate.

For borrowers with a score above 680 to 700, personal loan APRs can come in well below 15%, which is comparable to or lower than the effective cost of a 401(k) loan when you factor in lost investment growth. The loan is also completely independent of your employment, which eliminates a major risk factor.

Personal loans are also the better option if you want the borrowing activity to actively help your credit profile. Every on-time payment gets reported to the credit bureaus, building your payment history over the life of the loan. This means a personal loan can serve double duty as both a financing tool and a credit-building one.

Luckily, lots of lenders now offer prequalification with a soft credit inquiry, so you can check your likely rate before formally applying without impacting your credit score.

How your credit score affects your personal loan options

Your credit score is the single most important factor in determining what kind of personal loan rate you'll qualify for.

Here's a general breakdown of what borrowers in different credit ranges can expect:

This said, these are general estimates, and individual offers will vary based on income, debt load, and lender criteria. If your credit score is putting you in a higher rate tier, it may be worth taking a few months to improve it before applying.

Tools like Kikoff help users build credit by reporting on-time payments to all three major credit bureaus, which can move your score meaningfully within a few months of consistent use.

The hidden costs of each option

Both options come with costs that aren't always obvious upfront.

With a 401(k) loan, the hidden cost is the lost compounding on borrowed funds, plus potential tax consequences if your employment changes. With a personal loan, the hidden cost is the full interest paid over the life of the loan, which can add up significantly over a three to five year term.

Here's a simple formula to estimate the true cost of a personal loan:

Total interest paid = (Monthly payment x number of months) - Principal borrowed

For example, a $10,000 personal loan at 18% APR over 36 months has a monthly payment of roughly $361. That's $13,002 total, meaning you pay $3,002 in interest. Knowing this number upfront lets you make a genuinely informed decision.

Conclusion

Choosing between a 401(k) loan and a personal loan comes down to your credit situation, your job stability, and how much risk you're willing to accept with your retirement savings.

If your credit is strong, a personal loan is generally the cleaner choice. It doesn't touch your retirement account, and consistent on-time payments can actively help your credit. If your credit is limited or you're in a true emergency, a 401(k) loan can be a lower-rate alternative, as long as your employment is stable and you can commit to repaying it on schedule.

Either way, building and maintaining strong credit gives you more options and better rates in every borrowing situation. Kikoff is a simple, low-cost way to build credit by reporting on-time payments to all three major credit bureaus, starting at just $5 a month.