Fidelity 401k Loan Calculator

A Fidelity 401(k) loan calculator shows exactly what borrowing from your own retirement savings will cost you in each paycheck. A 401(k) loan lets you borrow from your vested balance and repay yourself with interest through payroll deductions, which sounds far better than paying a bank. But the true price includes lost market growth, the risk of a job change turning the loan into a taxable distribution, and five years of reduced contributions compounding against you. This calculator takes your loan amount, interest rate, repayment term, and pay frequency, then shows your per-paycheck deduction, total payments, interest repaid to yourself, and total repaid. Use it before signing the loan paperwork, because the numbers often change the decision.

How a 401(k) Loan Works

A 401(k) loan is not a loan from a lender; it is a withdrawal from your own account that you promise to repay. The IRS allows borrowing up to $50,000 or 50% of your vested balance, whichever is less, and most plans require repayment within five years through automatic payroll deductions. The interest rate is typically the prime rate plus 1%, and every dollar of interest goes back into your own account rather than to a bank.

That "pay yourself the interest" framing is the product's best marketing and its biggest misdirection. Yes, the interest lands in your account, but the far larger cost is invisible: the borrowed money stops compounding in the market for up to five years. The calculator prices the visible part precisely; the article prices the invisible part so you can weigh both. Together they give you the full ledger most borrowers never see until the damage is done.

Fidelity's Specific Rules

Fidelity administers 401(k) plans for thousands of employers, but the plan sponsor, your employer, sets the actual loan rules within IRS limits. Common Fidelity-plan terms include a $1,000 minimum loan, one outstanding loan at a time, a $50 to $75 origination fee, and a quarterly maintenance fee around $6.25. Some plans restrict loans to specific hardship-like purposes; others allow general-purpose borrowing.

Check your plan's Summary Plan Description before modeling anything, because two Fidelity-administered plans can differ meaningfully. The calculator's inputs, amount, rate, term, and frequency, are universal, but fees and eligibility are plan-specific. A quick call to Fidelity's participant line confirms your vested balance, available loan amount, and current interest rate.

Payroll Deduction Mechanics

Repayment happens through after-tax payroll deductions, which creates a subtle double-taxation wrinkle: you repay with dollars already taxed, and you will be taxed again when you withdraw those dollars in retirement. The interest you "pay yourself" is thus taxed twice, unlike the pre-tax contributions it replaces.

The per-paycheck deduction also reduces take-home pay for the full term. In the worked example, $178.25 disappears from every biweekly paycheck for five years, which is $3,850 less annual take-home. Borrowers who were already living paycheck to paycheck often respond by reducing 401(k) contributions, which multiplies the damage: less money entering the account and borrowed money not growing inside it. Before borrowing, test-drive the deduction for two months by diverting that amount to savings; if the budget breaks, the loan would have broken it too.

The True Cost: Opportunity Cost

The calculator shows $3,172.67 of interest on the example loan, all paid to yourself, which looks nearly free. The real cost is opportunity cost: $20,000 removed from investments earning a hypothetical 8% for five years forgoes about $9,400 of growth, even after crediting the 6% loan interest repaid. If the borrower also pauses contributions to afford the deductions, the gap widens further.

Market timing adds insult. Loans taken before bull runs miss the best compounding; there is no way to know in advance, which is precisely the risk. Academic studies of 401(k) loans consistently find that most borrowers end up with lower balances than comparable non-borrowers, and the gap persists long after repayment ends because the missed compounding never gets a second chance.

Job Loss: The Five-Alarm Risk

The gravest risk is separation from your employer. If you leave or are laid off with a loan outstanding, most plans require full repayment within a short window, often by the tax filing deadline for the year of separation. Fail to repay and the balance becomes a deemed distribution: taxable income plus a 10% early-withdrawal penalty if you are under 59 and a half.

On a $20,000 outstanding balance, that can mean $4,400-plus in federal taxes plus a $2,000 penalty, an overnight bill exceeding $6,000 for someone who just lost their job. This is the scenario that turns a convenient loan into a financial emergency, and it is entirely outside your control once a layoff arrives. Never borrow more than you could repay on short notice, and keep the loan balance in mind every time you consider a voluntary job change.

How to Use This Fidelity 401(k) Loan Calculator

Enter the loan amount you are considering, the annual interest rate your plan charges, the repayment term from 1 to 5 years, and your pay frequency. Press Calculate to see the deduction per pay period, the total number of payments, the interest you will repay to yourself, the total repaid, and the loan term restated. The per-paycheck figure is the one to budget against; make sure your cash flow survives it for the full term.

Model shorter terms too. A 3-year term raises each deduction but cuts the time your money sits outside the market, often the better trade for borrowers who can afford the larger bite. The calculator makes the trade-off explicit in seconds.

Worked Example 1: $20,000 at 6% Over 5 Years, Biweekly Pay

Borrow $20,000 at 6% annual interest, repaid over 5 years with biweekly paychecks. There are 130 pay periods, and the per-period rate is 6% divided by 26, about 0.2308%. The amortized payment is $20,000 times 0.002308 divided by one minus 1.002308 to the negative 130th power, which comes to $178.25 per paycheck.

Over 130 payments the borrower repays 130 times $178.25, or $23,172.67 total, of which $3,172.67 is interest credited back to their own account. These are the calculator's exact outputs. The visible cost looks modest, $3,173 paid to yourself, but remember the invisible ledger: $20,000 absent from the market for five years, plus $178.25 of reduced take-home every two weeks.

Worked Example 2: The Same Loan Over 3 Years

Now compress the same $20,000 at 6% into a 3-year term, still biweekly: 78 payments at the same 0.2308% periodic rate. The payment rises to $20,000 times 0.002308 divided by one minus 1.002308 to the negative 78th, about $282.02 per paycheck. Total repaid is 78 times $282.02, or $21,997.56, with interest of $1,997.56.

Compare the two paths step by step. The 3-year loan costs $103.77 more per paycheck but finishes two years sooner, saves about $1,175 in interest, and returns the $20,000 to market compounding two years earlier, recovering meaningful opportunity cost. If the paycheck can absorb $282, the shorter term dominates on every dimension except immediate cash flow. This is the comparison the calculator is built to make instant.

How the Loan Interest Rate Is Set

Most plans set the 401(k) loan rate at the prime rate plus 1%, adjusted periodically. When the Federal Reserve moves rates, new loans reprice accordingly, though your existing loan's rate is typically fixed at origination. Because the prime rate reflects broad borrowing costs, 401(k) loan rates usually land a point or two below personal loan rates and far below credit card APRs, which is the comparison that makes them tempting.

Do not mistake a low rate for a low cost. A 6% loan rate looks cheap next to a 24% credit card, but the card charges only on the balance you carry while the 401(k) loan silently forfeits market returns on the full principal for years. Compare total costs, not rates: card interest actually paid versus retirement growth actually missed.

The Five-Year Rule and the Residence Exception

IRS rules cap general-purpose 401(k) loans at five years, with level amortization and payments at least quarterly, though payroll deduction makes them far more frequent. The five-year clock starts at origination, not at your convenience, and the level-payment requirement means you cannot back-load the loan to ease early cash flow.

One exception exists: loans used to buy a primary residence may stretch beyond five years under some plans. This can make a 401(k) loan superficially attractive for a down payment, but raiding retirement for housing concentrates risk precisely when you are taking on a mortgage. Most planners consider it among the worst uses, since the home purchase already strains cash flow that must also service the loan deductions.

When a 401(k) Loan Makes Sense

Despite the costs, situations exist where borrowing from yourself beats the alternatives. Avoiding high-interest credit card debt at 24% APR, preventing foreclosure, or covering a true emergency when no cheaper credit exists can all justify it. The key test: the loan must solve a problem that costs more than the opportunity cost it creates.

Two conditions should accompany any yes. First, job stability: only borrow if you are confident you can repay or remain employed through the term. Second, contribution continuity: keep contributing enough to capture the full employer match during repayment, because forfeiting free match money is the fastest way to make the loan a net loss.

Alternatives Worth Pricing First

Before borrowing from retirement, price the alternatives with cold arithmetic. A home equity line of credit often carries single-digit rates with tax-deductible interest and leaves retirement compounding untouched. A 0% balance transfer card can bridge short-term needs nearly free. Even a personal loan at 10% may beat the 401(k) loan's true cost once opportunity cost is included.

Also consider simply pausing non-essential spending or selling unused assets; the cheapest loan is the one never taken. Run each alternative's total cost against the 401(k) loan's visible interest plus estimated missed growth. Borrowers who do this comparison honestly choose the retirement loan far less often than those who stop at "pay yourself the interest."

Tips for Borrowing From Your 401(k) Safely

1. Borrow the minimum you need. Every extra thousand borrowed is a thousand not compounding; size the loan to the problem, not the maximum.
2. Choose the shortest term you can afford. Shorter terms cut interest and return money to the market sooner.
3. Never lose the employer match. Keep contributing enough to capture the full match during repayment.
4. Keep an emergency buffer. Do not drain savings to afford the deductions; the next surprise then forces worse borrowing.
5. Plan for job loss. Only borrow what you could repay quickly if separated; know your plan's repayment deadline.
6. Automate and verify. Confirm deductions start correctly; missed payments can trigger default and deemed distribution.
7. Repay early when possible. Most plans allow extra payments; windfalls should shorten the loan, not fund lifestyle.
8. Revisit the decision yearly. If cheaper credit appears or the emergency passes, refinance out of the retirement loan.

Frequently Asked Questions

1. How much can I borrow from my Fidelity 401(k)?

Up to $50,000 or 50% of your vested balance, whichever is less, subject to your employer's plan rules. Fidelity's participant site shows your exact available amount after logging in.

2. What interest rate will I pay?

Typically the prime rate plus 1%, set by your plan. The interest goes back into your account, but remember it is repaid with after-tax dollars that will be taxed again at withdrawal.

3. How long do I have to repay?

Up to five years for general-purpose loans through payroll deduction; loans for a primary residence may allow longer terms under some plans. Shorter is better for minimizing missed market growth.

4. What happens if I leave my job with a loan outstanding?

You generally must repay the balance by the tax filing deadline for the year you separated. Unpaid amounts become taxable distributions plus a 10% penalty if you are under 59 and a half.

5. Does a 401(k) loan affect my credit score?

No. It is not reported to credit bureaus since you are borrowing from yourself. It also requires no credit check, which is part of its appeal in emergencies.

6. Can I still contribute while repaying a loan?

Most plans allow it, and you should, at least enough to capture the full employer match. Some borrowers reduce contributions to afford deductions, which compounds the loan's damage.

7. Are there fees for a Fidelity 401(k) loan?

Commonly a $50 to $75 origination fee plus a small quarterly maintenance fee, varying by plan. Fees are minor next to opportunity cost but worth confirming in your plan documents.

8. Is the interest really paid to myself?

Yes, it is credited to your account. But it is paid with after-tax dollars and taxed again on withdrawal, and it does not compensate for the market growth the borrowed principal missed.

9. Can I have two 401(k) loans at once?

Most plans allow only one outstanding loan, though the IRS permits more. Check your plan's rules; even where allowed, stacking loans multiplies every risk described here.

10. What is a deemed distribution?

When a loan defaults, usually through missed payments or separation without repayment, the outstanding balance is treated as a taxable distribution, triggering income tax and possibly the 10% early-withdrawal penalty.

11. Should I borrow to pay off credit cards?

Sometimes. Compare the card's APR against the loan's true cost including missed growth, and only proceed if you also fix the spending that created the card debt; otherwise you end with card debt again plus a retirement loan.

12. Can I repay the loan early?

Usually yes, through extra payments or a lump sum. Early repayment is one of the best uses of a bonus or tax refund while a loan is outstanding.

13. Does the loan reduce my take-home pay?

Yes, by the per-paycheck amount for the full term, deducted after taxes. Budget the calculator's per-period figure before committing.

14. What if the market crashes while my loan is out?

Ironically that is the one scenario favoring the borrower: money outside the market avoids the decline. But since crashes are unpredictable, this is luck, not strategy, and bull markets punish the same position.

15. Are 401(k) loans ever the best option?

When the alternative is worse: catastrophic high-interest debt, foreclosure, or emergencies with no cheaper credit. The test is always total cost versus total cost, with opportunity cost included.

CONCLUSION

A Fidelity 401(k) loan calculator makes the visible terms precise: $178.25 per biweekly paycheck, $3,172.67 of self-paid interest, $23,172.67 total on a five-year $20,000 loan. But the decision lives in the invisible ledger: missed compounding, double-taxed interest, reduced take-home pay, and the job-loss risk that can convert the balance into taxes and penalties overnight. Borrow only the minimum, choose the shortest affordable term, protect the employer match, and price the alternatives first. Your future self is the lender here; treat their money with more care than a bank's.