Line of Credit vs Installment Loan: Which Should You Choose?

What This Article Covers

Choosing between a personal line of credit and an installment loan can save you hundreds—or cost you thousands—depending on how you plan to use the money. This guide breaks down how each product works, what they cost in real dollars, and which fits your situation.

You'll see side-by-side comparisons, worked examples with specific APRs, and a clear roadmap for deciding which structure matches your cash-flow needs.

Key Takeaways

• Installment loans deliver a lump sum upfront with fixed monthly payments over a set term; lines of credit let you draw, repay, and redraw during a draw period.
• Lines of credit typically charge interest only on the amount you actually use, making them cheaper for intermittent or unpredictable expenses.
• Installment loans offer payment certainty and are easier to budget, especially for one-time purchases like debt consolidation or a car.
• Most personal lines of credit carry variable APRs tied to the prime rate, while installment loans often lock in a fixed rate at origination.
• Lenders such as Marcus, Figure, and LightStream offer both products, but eligibility, fees, and rate tiers differ sharply.

How Installment Loans Work

An installment loan is a lump-sum disbursement you repay in equal monthly payments over a fixed term—typically 24 to 84 months. The moment you sign the promissory note, the lender deposits the full amount into your bank account, and your first payment is due 30 days later.

Interest & Amortization

Every payment includes principal and interest. Early in the term, most of each payment goes to interest; by the final months, nearly all goes to principal. This is called amortization.

Example: A $15,000 personal loan at 10.99% APR over 48 months costs $387 per month. Over the life of the loan, you'll pay $3,576 in interest. Month one, roughly $137 goes to interest and $250 to principal; by month 48, nearly the entire $387 reduces principal.

Common Use Cases

• Debt consolidation: Roll multiple high-interest credit cards into one predictable payment.
• Home improvement: Finance a roof, HVAC system, or kitchen remodel.
• Auto purchase: Buy a used car outright if dealer financing is too expensive.
• Medical bills or tax debt: Pay off a one-time obligation without lingering balances.

Prepayment Flexibility

Most major lenders—LightStream, SoFi, Marcus by Goldman Sachs, Best Egg—charge no prepayment penalty. You can pay extra or pay off early without fees, though you won't recapture future interest since it's front-loaded.

How Lines of Credit Work

A personal line of credit (often called a PLOC or just LOC) gives you access to a credit limit—say $5,000 to $100,000—that you can tap whenever you need it during a draw period, usually 2 to 5 years. You pay interest only on the outstanding balance, not the full limit.

Draw Period vs Repayment Period

1. Draw period: Borrow, repay, and borrow again. Many lenders require interest-only minimum payments during this phase.
2. Repayment period: The line closes to new draws, and you pay down the balance over a fixed term (often 10 to 20 years for HELOCs, 3 to 5 years for unsecured PLOCs).

Variable Rates

Most lines of credit carry a variable APR pegged to the Wall Street Journal prime rate. As of early 2026, the prime rate hovers near 7.50%, so a PLOC priced at prime + 5% would carry a 12.50% APR today—but could rise or fall with Federal Reserve policy.

Common Use Cases

• Irregular expenses: Quarterly tax bills, seasonal inventory for a small business, or home repairs spread over months.
• Emergency liquidity: Keep a $10,000 line dormant and tap it only if the transmission fails or the furnace dies.
• Bridge financing: Cover cash-flow gaps between receivables and payables for freelancers or contractors.

Secured vs Unsecured

• Secured lines (HELOCs, securities-backed) use your home equity or brokerage account as collateral, offering lower rates but risking foreclosure or margin calls.
• Unsecured lines rely solely on creditworthiness. Lenders like Figure, Upgrade, and LendingClub offer unsecured PLOCs with APRs between 10% and 36%, depending on your FICO score and debt-to-income ratio.

Side-by-Side Comparison

Worked Example: $20,000 Over Five Years

Let's compare the total cost of borrowing $20,000 for 60 months under each structure, assuming you draw the full amount immediately and make no additional draws.

Installment Loan at 12.99% APR (Fixed)

• Monthly payment: $453
• Total interest paid: $7,180
• Total repayment: $27,180

Every month, the payment is identical. Your budget is predictable, and you know exactly when the loan will be paid off.

Personal Line of Credit at 12.99% APR (Variable)

Assume you draw $20,000 on day one and make interest-only payments for a 3-year draw period, then fully amortize over the remaining 2 years.

• Months 1–36 (interest-only): ~$216/month
• Months 37–60 (amortization of $20,000): ~$900/month
• Total interest paid: ~$8,900
• Total repayment: $28,900

The line of credit costs $1,720 more because you defer principal payments for three years. If rates rise during the draw period, the gap widens further.

Key insight: A line of credit is cheaper only if you draw less than the full limit or repay principal quickly during the draw period.

Credit Requirements & Where to Apply

Installment Loans

• Excellent credit (720+): SoFi, LightStream, Marcus by Goldman Sachs. Expect APRs from 7.99% to 13.99% for unsecured personal loans up to $100,000.
• Good credit (660–719): Discover, Upgrade, Best Egg. APRs typically 11.99% to 19.99%.
• Fair credit (580–659): Avant, OneMain Financial, Upstart. APRs can reach 25% to 35.99%, and origination fees often apply.

Lines of Credit

• Excellent credit: Figure (HELOC and unsecured), PNC Ready Access, TD Bank. Unsecured PLOCs start around 10% APR; HELOCs may dip below 8% for top-tier borrowers.
• Good to fair credit: LendingClub, Upgrade, Regions Bank. Unsecured PLOCs from 13% to 25%.
• Business lines: Bluevine, OnDeck, and Fundbox offer business lines of credit with revenue-based underwriting; personal credit scores still matter, especially for guarantees.

Pro tip: Prequalification on most platforms—SoFi, Marcus, LendingClub—uses a soft credit pull and won't ding your score. Final approval triggers a hard inquiry.

Common Mistakes to Avoid

1. Treating a line of credit like free money. Interest-only minimums feel painless, but your balance can balloon if you never pay down principal. Set a repayment goal each month.
2. Ignoring variable-rate risk. If the prime rate climbs 2 percentage points, a PLOC at prime + 6% jumps from 13.5% to 15.5%. Budget for rate swings.
3. Paying origination fees on small loans. A 5% origination fee on a $5,000 loan is $250—often more than you'd pay in extra interest by choosing a no-fee lender like Marcus or SoFi.
4. Skipping the DTI calculation. Lenders cap your debt-to-income ratio at 36% to 50%. If you're already carrying a mortgage and car payment, a new $500/month installment loan might disqualify you.
5. Confusing a HELOC with an unsecured line. A HELOC requires home equity, involves closing costs (1–3% of the limit), and puts your house at risk if you default. Unsecured lines are faster and safer but carry higher APRs.
6. Drawing the full limit on day one. Unless you need the entire amount for a single project, draw incrementally. You'll pay interest only on what you actually use.

Which Is Right for You?

Choose an Installment Loan If…

• You need the full amount upfront for a specific purchase or consolidation.
• You value fixed monthly payments and a known payoff date.
• You have good to excellent credit and can lock in a competitive fixed APR.
• You dislike the mental overhead of tracking a variable balance and rate.

Choose a Line of Credit If…

• Your expenses are unpredictable—ongoing home repairs, seasonal business costs, or a series of smaller medical bills.
• You want to keep a cash-flow cushion without paying interest on unused funds.
• You can handle variable payments and are disciplined about paying down principal.
• You have access to a HELOC and qualify for a low secured rate (but understand the foreclosure risk).

Conclusion & Next Steps

Both installment loans and lines of credit have a place in a smart borrowing strategy. Installment loans deliver simplicity and certainty; lines of credit offer flexibility and lower costs if you use them strategically. Run the numbers for your situation: calculate total interest, compare APRs across lenders, and prequalify with two or three to see real rate offers.

Head to our personal loan calculator to model monthly payments, or explore our HELOC vs personal loan comparison if you're weighing secured versus unsecured options. Always consult a licensed financial advisor before signing any credit agreement—especially if you're consolidating high-interest debt or tapping home equity.

Run the numbers

• Personal Loan Calculator