A 401(k) loan borrows from a participating plan account and requires scheduled repayment while creating investment, employment, fee, and tax risks.
A 401(k) loan is a plan feature that lets an eligible participant borrow against the participant’s vested 401(k) balance and repay the loan, with interest, to the plan account. A compliant loan is generally not taxable when issued, but a default or plan-loan offset can turn the unpaid amount into a taxable distribution.
A plan is not required to offer loans. Its summary plan description and loan policy can be stricter than the federal maximums.
The participant applies through the plan administrator, chooses an amount within the plan’s limit, and agrees to a repayment schedule. The plan sells or removes investments to fund the loan, and repayments are usually made through payroll deductions.
Each payment includes principal and interest. Principal restores borrowed account value; interest is credited to the participant’s account under the plan. The participant remains responsible for the scheduled payment even if market performance, employment, or household finances change.
The loan is secured by the participant’s plan balance and usually does not require the same credit underwriting as a bank loan. That operational convenience does not make it free or riskless.
The general maximum is the lesser of:
When 50% of the vested balance is less than $10,000, federal rules can permit a plan to allow borrowing up to $10,000, but the plan is not required to offer that exception. A plan can impose a lower maximum, a minimum loan size, limits on concurrent loans, setup fees, and narrower approved purposes.
Kai has a vested 401(k) balance of $60,000 and no other plan loan during the relevant lookback period.
The federal maximum is therefore $30,000, but Kai’s plan could permit less or decline to offer loans. If Kai had another recent loan, the maximum could be reduced further.
Only the vested balance matters. Unvested employer contributions generally do not increase the amount available to secure the loan.
A general-purpose plan loan generally must be repaid within five years through substantially level payments of principal and interest made at least quarterly. A loan used to purchase the participant’s principal residence can qualify for a longer term if the plan permits it and documentation requirements are met.
Plans commonly use payroll deductions, but payroll processing does not transfer compliance responsibility away from the participant. Leave, payroll changes, insufficient pay, or administrative errors can create missed payments. Federal rules allow limited cure periods and special treatment for certain military service or leaves, but plan procedures control implementation.
Repayments are not elective deferrals or employer contributions. They restore the plan loan balance and do not themselves use the annual employee-contribution limit. The household still needs enough cash flow for loan payments and any continued retirement contributions.
The statement you pay interest to yourself is only partly informative. Interest generally returns to the participant’s plan account rather than a bank, but the transaction still has economic costs:
The loan’s true cost cannot be known in advance because the return on the investments that would otherwise have remained in the account is uncertain.
If repayments fail to meet the loan terms, the outstanding balance can become a deemed distribution. Previously untaxed value is generally included in income, and an additional tax on early distributions can apply unless an exception is available. A deemed distribution does not necessarily release the participant from the plan’s loan obligation.
When employment ends or the account is distributed, the plan may reduce the account balance by the unpaid loan. This plan loan offset is an actual distribution and can be eligible for rollover treatment. A qualified plan loan offset caused by severance from employment or plan termination can have an extended rollover deadline through the federal tax-return due date, including extensions, for the year of the offset.
The participant generally must use outside money equal to the offset amount to complete that rollover because the plan already applied the account balance to the debt. Plan terms differ: some allow scheduled repayment after employment, while others accelerate or offset the balance.
| Method | Immediate tax treatment | Repayment | Main risk |
|---|---|---|---|
| 401(k) loan | Generally not taxable if compliant | Required under plan schedule | Default, job change, fees, and lost market exposure |
| Hardship withdrawal | Generally taxable if pre-tax; additional tax may apply | Cannot be repaid as a loan | Permanent reduction in retirement assets |
| Bank or credit-union loan | Loan proceeds generally not income | Paid to lender with interest | Credit cost, underwriting, and default consequences |
| Credit-card borrowing | Borrowing generally not income | Revolving repayment | Potentially high interest and compounding debt |
A loan can be less damaging than a permanent withdrawal only if it is repaid and does not displace more valuable saving or create unaffordable cash-flow pressure. Consumer debt can be more expensive, but it does not expose retirement assets to plan-default taxation.
Read the plan’s loan policy and summary plan description. Confirm the permitted amount, interest rate, fees, payment frequency, term, prepayment procedure, cure period, and treatment after leave or employment termination.
Compare the loan with outside borrowing using total interest and fees, after-tax cash flow, collateral and credit consequences, expected repayment reliability, and the value of retirement contributions that might be displaced. Stress-test a job loss or pay reduction rather than assuming payroll deductions will continue unchanged.
A 401(k) loan can affect taxes, retirement security, and household liquidity. This article is educational and is not individualized tax, legal, credit, retirement, or investment advice.