How to Add a Texas HELOC and Keep Your Low First Mortgage

The Quick Read: The line is a separate lien recorded behind your existing first mortgage, so the first loan keeps its balance, term, and payment while the new line draws on the equity above it, limited by a combined loan-to-value cap that depends on whether the property is your homestead, a second home, or a rental. Texas treats those three cases very differently. Most of the confusion online comes from mixing them up.

• A line sits in second position and leaves the first loan untouched. A cash-out refinance replaces the first loan and reprices the entire balance.
• A Texas primary residence is a homestead and caps at 80% combined loan-to-value, no matter how strong the credit profile.
• Investment properties in Texas are non-homestead transactions. In Lendmire’s wholesale network, an investment line caps at 70% CLTV, needs a 700 credit profile, and tops out at $500,000.
• The line must be vested in an individual or a revocable living trust. An LLC cannot hold title on these lines.
• Every figure here is subject to lender guidelines and full file review. None of it is a commitment to lend.

What Does It Mean to Keep Your First Mortgage and Add a Line?

A home equity line of credit is a revolving loan secured by the property. You borrow against a limit, repay, and borrow again during a draw period. The CFPB notes that a draw period could last 10 years, for example. After that, a repayment period begins and you can no longer borrow.

Adding one behind your first mortgage changes only the new money. Your existing loan stays exactly as it was. That matters when the first mortgage is the best financing you will ever hold on the property.

The tradeoff is real. You now carry two payments instead of one. The line’s pricing floats, so the second payment can move. Bankrate explains that HELOC pricing typically follows an index such as the prime rate.

If you need a large sum and the first loan is not unusually cheap, a cash-out refinance can be the simpler answer. If the first loan is cheap and the need is modest, a line usually protects more value. The flip point is the size of your first-loan advantage compared with the amount you need.

Why Does Texas Feel Different?

Texas feels different because its constitution protects the homestead from forced sale and writes the home equity lending rules directly into that protection. The Texas Real Estate Research Center at Texas A&M explains that Article XVI, Section 50 covers three loan types: cash-out refinances, home equity loans, and HELOCs. On a homestead, the new loan plus all other debt secured by the home cannot exceed 80% of fair market value.

Here is the point many investors miss. The same source states that these loans may not be taken out on a secondary residence or on a rental or investment property. The homestead rules attach only to the homestead.

That does not make rental lines illegal in Texas. It means the homestead rules, including the 80% cap, do not govern a rental line. The limits on a rental come from the lender’s program, not the state constitution. Many lenders simply choose not to offer rental lines, and that gap is where the myth that Texas bans them comes from.

In practice, the three property types sort out like this:

How Does Underwriting Treat the Line, Step by Step?

Underwriting treats the line as a personal-credit transaction secured by real estate. It does not read the rent the way a DSCR loan does. Across the wholesale network, the review runs in this order.

1. Property eligibility. Single-family, 2-4 unit, PUD, townhome, and condominium properties are eligible, including non-warrantable condos. Manufactured homes, co-ops, condotels, log homes, and commercial, mixed-use, or agricultural properties are not offered. In Texas, the property is limited to 10 acres. A property listed for sale, or listed within the past 60 days, is ineligible in Texas.

2. Title and vesting. The borrower must be an individual or hold title in a revocable living trust. LLCs, corporations, partnerships, and irrevocable, blind, or land trusts cannot hold title.

3. Credit. The program floor is 600, though occupancy raises it, as shown below. The score model is a single-bureau score keyed to the primary wage earner, and the report can be no more than 90 days old at closing.

4. Debt-to-income. The maximum is 50%, and 45% for profiles from 600 to 679. A ratio above 45% requires at least a 680 score. The test uses the interest-only payment on the maximum draw, not the amount you plan to use.

5. Valuation. Lines at or below $500,000 ordinarily use an automated valuation with no traditional appraisal. A higher CLTV may require a secondary valuation, and a borrower may request a full appraisal in any case.

6. Combined leverage. The lender adds the first-mortgage balance to the full line limit. It then compares the total to the cap for that occupancy and credit tier.

Step six is where borrowers get surprised. The line is tested at its limit, so a small planned draw does not shrink the leverage test.

Sizing the line

The formula is simple: property value times the maximum CLTV, minus existing liens, equals the room for a line. Then the dollar cap applies.

Run it on an investment property valued at 100%. With a 70% CLTV ceiling and a first mortgage at 40% of value, about 30% of value is available, subject to the $500,000 cap. Run it on a Texas homestead with the 80% cap and a first mortgage at 55% of value. About 25% of value is available.

Both examples assume the credit tier supports the full ceiling. A weaker profile lowers the cap. At least 75% of the line is drawn at closing, which matters for planning, because it is not a pure standby line.

Which Structures and Variations Exist?

Two features vary: lien position and the draw structure.

The network writes a standalone line in either first or second lien position. A second-lien line is the one that preserves your first loan. A first-lien line only makes sense when the property has no mortgage. Some credit unions and banks write rental lines only in first position. That is a product choice, not a legal bar, so a second-lien rental line requires a lender that writes one.

For primary residences and second homes, there are two draw structures:

Investment lines run the 5-year-draw structure only. On either structure, pricing floats through the draw and repayment periods and never converts to a fixed amount.

The step-up at the end of the draw period is the cost most owners underestimate. The payment changes once principal begins to amortize, so a line that feels light during the draw can feel heavy afterward. Underwrite your own cash flow against both payments and against that step-up.

Line size runs from $25,000 to $750,000. A line above $500,000 is for primary residences only, needs a full appraisal, and caps at 75% CLTV. Investment lines never exceed $500,000, and there is no tier above that.

On a Texas homestead, the subsequent-draw minimum is $4,000 under the 5-year-draw structure. The 3-year-draw structure does not state a minimum. A borrower can hold up to three lines, and anyone owning more than 15 financed properties is not eligible.

Where Does the Rule Break?

The general rule is that you keep the first loan and add a second lien. These edge cases bend it.

The collateral is your own Texas home. Then the 80% homestead cap applies regardless of what you spend the money on. The Texas A&M source also notes that a loan of this type cannot be secured by additional property, so you cannot pledge a rental alongside the home to get around the cap. A Texas primary residence also carries a 12-day waiting period, a one-lien-at-a-time rule, and 12-month seasoning. None of those bind a second home or an investment property.

Your existing first loan was itself a homestead equity loan. This is the hardest trap to see. Texas treats a prior home equity loan or cash-out refinance on a homestead as shaping what can sit behind it. The practical rule is to check the lien history before you apply. Because the rules are technical, a Texas title company or real estate attorney should review it.

A former residence became a rental. Homestead status can linger after you move out. Title review should confirm that status before anyone prices a line on the property. Texas homestead law also generally requires both spouses to sign liens, as Lone Star Land Law describes.

The property sits in an LLC. A property already deeded to an entity needs a vesting change first, or a DSCR cash-out instead, subject to program terms. Lendmire’s piece Can You Keep a Low First Mortgage and Add a Rental HELOC on Your Old Home? walks through that tradeoff for a former residence.

You refinance the first loan later. A second lien does not stay second automatically. A new first lender will usually ask the line holder to sign a subordination agreement. Plan for that before assuming you can refinance freely.

You are underwriting on rent. A line is a personal-credit product, so it does not qualify on property rent. If your income documentation is thin but the property is strong, a DSCR loan, which qualifies primarily on property-level rental income covering the payment, subject to lender guidelines, may be the better fit. The complete DSCR loans guide covers that path.

What Does the Investor Decision Look Like?

The decision comes down to six comparisons: the amount you need, how long you will hold the debt, the first mortgage’s cost against your alternatives, closing costs, the repayment structure, and your debt ratio.

A line fits when the need is moderate, the first loan is hard to replace, and the borrower is comfortable with floating pricing. Examples include funding a down payment on the next rental or covering a capital project. One caution applies. Financing an entire purchase with a line leaves no equity cushion if values fall.

A cash-out refinance fits when the amount is large and the first loan has no special value. Standard DSCR cash-out tops out at 75% LTV for typical rentals, and the property’s rent, not your personal income, drives qualification. It replaces the low first loan, though, and reprices everything. Every figure here varies by lender and program — guidelines, property type, leverage, and credit profile all apply.

Here is how the paths compare:

A DSCR ratio compares rent to the full monthly obligation. Clearing 1.00 is not the same as positive cash flow, because repairs, vacancy, management, and capital costs sit outside the calculation. Whichever path you pick, keep a margin for those costs.

Tax treatment can depend on how the funds are used and how the property is held; investors should keep clear records and speak with a qualified tax professional before relying on any deduction.

Key Terms Defined

Combined loan-to-value (CLTV): The total of all liens on the property, including the line’s full limit, divided by the property’s value.

Draw period: The stretch when you can borrow against the line, often with interest-only payments.

Repayment period: The stretch after the draw ends, when you repay principal and can no longer borrow.

Second lien: A loan recorded behind the first mortgage, which leaves the first loan unchanged.

Homestead: The home you occupy as your primary residence, which carries added protection and added lending limits in Texas.

Subordination agreement: A signed document that keeps the line behind a new first mortgage after a refinance.

Next Step

If you are considering a home equity line and want to see how the numbers work, Lendmire can help you compare HELOC options based on the property, the equity available, credit profile, combined leverage, and your goals. Lendmire is a broker that arranges these lines through select wholesale partners in the 16 states where it offers full-service lending, and Texas is one of them. The calculator on the page offers an illustrative estimate only. You can reach the team at 828-256-2183.

About Lendmire

Lendmire, NMLS# 2371349, is a mortgage brokerage that arranges home equity lines of credit through wholesale lending partners in its 16 full-service states. Lines on primary residences, second homes and investment properties are each reviewed individually by the lender under the program’s occupancy, credit and combined-loan-to-value guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. CFPB: What Is a Home Equity Line of Credit?

2. Bankrate: HELOC Glossary

3. Texas Real Estate Research Center, Texas A&M: What to Know About Home Equity Loans in Texas

4. Lone Star Land Law: Homestead Protections in Texas