If you’re looking to access the equity in your home, two of the most common options are a HELOC (Home Equity Line of Credit) and a second-lien mortgage.

Both allow you to tap into your home’s value without refinancing your first mortgage—but they work very differently.

This guide breaks down how HELOCs and second mortgages work, the pros and cons of each, and when they actually make sense.

A HELOC is a revolving line of credit secured by your home’s equity.

It works similarly to a credit card:

• Borrow funds as needed
• Pay down the balance
• Reuse the available credit during the draw period

Typical HELOC Structure:

• 3–5 year draw period (interest-only payments)
• Followed by a repayment period (fully amortized payments)

This flexibility makes HELOCs one of the most versatile home equity options.

HELOCs are commonly used for:

• Home renovations
• Emergency funds
• Short-term financing
• Liquidity management

Key Features:

• Variable interest rates (usually tied to Prime Rate)
• Lower rates than credit cards
• Higher rates than first mortgages

Many HELOCs also include:

• Debit-style cards
• Check-writing access
• Direct transfers to your bank account

Because early payments are often interest-only, HELOCs typically have lower initial monthly payments.

Most lenders cap the combined loan-to-value (CLTV) at around:

85% of your home’s value

This includes:

• Your existing first mortgage
• The HELOC combined

Some programs may also require:

• Minimum line amounts
• Initial draw requirements

A second mortgage (also called a fixed-rate second lien) is a separate loan on top of your existing mortgage.

Key Differences from a HELOC:

• Funds are received as a lump sum
• Payments are fully amortized from day one
• Interest rate is fixed
• You cannot re-borrow once funds are used

Because of amortization, monthly payments are usually higher—but they offer predictable, stable payments over time.

A HELOC is typically best for:

• Short-term borrowing
• Projects with uncertain costs
• Borrowers who plan to pay the balance down quickly
• Ongoing access to funds

The flexibility is the biggest advantage—but the tradeoff is variable rates and potential payment increases.

A second mortgage is usually better for:

• Debt consolidation
• Large, one-time expenses
• Long-term borrowing needs
• Borrowers who want payment stability

You’ll pay more monthly compared to a HELOC—but you eliminate rate uncertainty.

Many homeowners today have low first-mortgage rates.

Refinancing that loan to access equity often means:

• Giving up a low rate
• Resetting the loan term

HELOCs and second liens allow you to:

• Access equity
• Keep your existing mortgage
• Avoid a full refinance

This is why these products have become much more common in today’s rate environment.

While keeping your low rate sounds like the obvious choice, it’s not always the best financial move.

In some cases, a cash-out refinance may:

• Lower your combined monthly payment
• Reduce total interest over time
• Simplify everything into one loan

The Right Option Depends On:

• How long you’ll carry the balance
• Your repayment strategy
• Current interest rates
• Total cost—not just monthly payment

HELOC Pros:

• Flexible borrowing
• Lower initial payments
• Reusable credit line

HELOC Cons:

• Variable rates
• Payment increases over time
• Requires discipline to manage

Second Mortgage Pros:

• Fixed interest rate
• Predictable payments
• Ideal for long-term debt

Second Mortgage Cons:

• Higher monthly payments
• No ability to reuse funds
• Less flexibility

The right choice depends on your situation:

Choose a HELOC if you want flexibility and short-term access to funds.

Choose a second mortgage if you want stability and a structured repayment plan.

In some cases, neither is the best option—and a refinance may make more sense.