Most personal loan lenders do not count 401(k) loans as debt for DTI purposes because 401(k) loans do not appear on credit reports and the borrower is technically borrowing from themselves. However, the monthly 401(k) loan repayment does reduce your take-home income, which lenders see when they review pay stubs. The net effect is usually neutral or slightly negative.
Why 401(k) loans are different. A 401(k) loan is a loan from your own retirement account, secured by your account balance. The IRS allows borrowing up to 50% of your vested balance or $50,000, whichever is less. The loan does not appear on credit reports because the lender (your employer's 401(k) plan administrator) is not a credit-bureau-reporting institution.
Why DTI is not directly affected. Standard DTI calculations include obligations that show on the credit report (mortgage, auto, credit cards, personal loans, student loans). Since 401(k) loans do not show on the report, the lender does not include them in the DTI ratio in the typical computation. This means a $400/month 401(k) loan repayment does not directly count against you.
Why income is reduced. 401(k) loan repayments are deducted from your paycheck (typically every pay period) before you receive the funds. So your take-home pay shown on pay stubs is already reduced by the loan repayment. Lenders use take-home or gross income from pay stubs and tax returns; the reduced figure is what they work with.
Net effect. If you make $6,000 a month gross and have a $400 401(k) loan repayment, your net pay is $400 lower than it would otherwise be. Your DTI calculation uses gross income (which is unchanged), so the ratio looks fine, but the cash-flow analysis (some lenders do this in addition to DTI) shows less monthly disposable income.
Lender-specific behavior. Some lenders (especially mortgage lenders) explicitly ignore 401(k) loans for DTI. Others count them. Personal loan lenders are generally less stringent than mortgage lenders. SoFi, Marcus, and most major banks do not count 401(k) loans. Smaller online lenders may have different policies; ask before applying.
Risk consideration. If you leave your job (voluntarily or involuntarily) before repaying the 401(k) loan, the IRS treats the unpaid balance as a distribution. You owe income tax on the unpaid amount plus a 10% early-withdrawal penalty if you are under 59.5. This can add $5,000-$15,000 in unexpected tax liability on a $30,000 loan. Lenders sometimes ask about this risk if your loan balance is large.
Disclosure on the application. Personal loan applications usually do not specifically ask about 401(k) loans. The application asks about "monthly debt obligations." Whether to disclose the 401(k) loan is a judgment call; most borrowers do not, since the loan does not appear on the credit report. Lying about a known monthly obligation can be loan fraud, but 401(k) loans are usually treated as a non-debt obligation.
Bigger picture. Taking a 401(k) loan to pay off credit cards has its own pros and cons (see other articles in this section). The interaction with personal loan applications is a side effect, not a primary consideration. If the 401(k) loan is the right choice for the underlying debt situation, the personal loan implications are usually minor.