The Quick Read: A fixed-payment conversion is an optional lock that some HELOC agreements offer. It turns part of your drawn balance into a separate loan with its own fixed schedule, and it exists only if your plan documents created it.
- A lock is a contract feature, not a borrower right, so the plan addendum decides everything.
- Locks are generally a draw-period tool. Once you are in repayment, the window usually closes.
- Most locks cover a chosen slice of the balance. The rest stays variable and drawable.
- The locked slice amortizes, so your payment on that slice rises in exchange for certainty.
- The standalone equity lines Lendmire places through its wholesale network float across the draw and repayment periods and never convert to fixed.
A home equity line of credit (HELOC) is a revolving line secured by a property. During the draw period you borrow against it, usually paying interest only. Then repayment begins and the balance amortizes. The fixed-payment conversion sits in the middle of that picture. It lets you take some of the uncertainty out of the draw period, but only when the plan was built to allow it.
How large a line the equity supports.
An equity line is sized by combined loan-to-value, occupancy, and credit — not by rental coverage. Switch the occupancy or the credit band and the ceiling moves with it.
Investment-property lines require a 700 minimum credit score; second-home lines start at a 640 minimum and primary-residence lines at 600, and the combined-LTV ceiling steps down as the credit band drops on primary-residence and second-home lines and holds on investment-property lines; the line cap steps down on primary-residence lines and holds at every tier on investment-property and second-home lines.
A debt-to-income ratio above 45% requires 680+ credit. Profiles under 640 are limited to single-family homes. At least 75% of the approved line is drawn at closing. Ceilings, floors, and caps update from Lendmire’s centralized guideline source.
Line estimate
Illustrative estimate only — not a quote, Loan Estimate, approval, or commitment to lend. The rate is an editable assumption; equity-line pricing is variable through both the draw and repayment periods and never converts to fixed. Occupancy and credit drive the ceiling together: an investment property tops out at 70% combined LTV (minimum credit 700, line cap $500,000); a second home tops out at 90% combined LTV (minimum credit 640, line cap $500,000), with the ceiling stepping down as the credit band drops (the cap holds at every tier); a primary residence tops out at 90% combined LTV (minimum credit 600), and its $750,000 maximum line is available only at 75% combined LTV or below with a 700-or-better credit profile (720 on the longer-runway program) and a full appraisal. Lines above $500,000 require a full appraisal. Credit, debt-to-income, property type, and full underwriting review all affect the final line.
Here is the practical version. Investors usually ask this question after drawing on a line for a down payment or a rehab. They want to know whether the cost of that draw can be pinned down. Sometimes it can. Often it cannot. This article shows you how to tell which one applies to you.
What Is a Fixed-Payment Conversion?
A fixed-payment conversion splits off a portion of a variable balance into a separate loan with a set term and a set payment schedule. You pay it in addition to the minimum payment on whatever stays variable.
Three similar-sounding things get confused here:
- An in-account lock converts part of an existing balance inside the same line. No new loan is made.
- A fixed-rate HELOC from day one is a product built that way at the start. There is nothing to convert.
- A refinance into a new loan replaces the line entirely. It is a different transaction with its own costs.
This article covers the first one. The other two matter later, when your plan has no lock at all.
How a Lock Works, Step by Step
Plans differ, but the sequence is broadly similar across most lenders.
1. The line starts variable. Draw-period payments are usually interest-only on what you have drawn. Lendmire’s piece HELOC Interest-Only Payment Requirements During the Draw Period covers that baseline.
2. You elect a lock. You choose a balance and a term. Bankrate reports that lenders typically allow this at account setup or at any point in the draw period. It also notes that lenders may cap how many locks you can have and may require minimum balances.
3. The locked piece becomes a sub-loan. Yahoo Finance explains that it carries its own installments, paid on top of the minimum on the variable balance.
4. Your available credit keeps working. The unlocked portion stays available for new draws. Many plans let you lock several separate balances and, in some cases, unlock and relock.
5. The fixed segment amortizes. Bankrate puts the typical terms at roughly five to thirty years. A long term may be shortened by the plan’s repayment schedule.
Notice what is missing from that list: any guarantee. Every step depends on language in your agreement.
The Rules to Look For in Your Plan
The rules are not universal. They live in your HELOC agreement or addendum. Use this table as a reading guide, and leave the numbers to your own documents.
| Rule | What it governs | Where to look |
|---|---|---|
| Lock window | When you may request a lock | Addendum |
| Minimum lock | Smallest balance you can convert | Fee schedule |
| Segment cap | How many locks can be open | Addendum |
| Fees | Cost per lock or unlock | Fee schedule |
| Pricing | How the fixed figure is set | Addendum |
| Term choices | Length of each fixed segment | Addendum |
| Reversal | Whether you can unlock or relock | Addendum |
| Eligibility | Account standing, property use | Agreement |
Fixed pricing is the item people miss. A locked segment is priced at conversion, and it can come in higher than your current variable cost. You are paying for certainty.
Draw Period Versus Repayment Period
During the draw period, the line is flexible. You borrow, repay, and borrow again. If a lock exists, this is where it lives. Once repayment starts, you generally cannot draw, and a lock is generally off the table.
Repayment is where payment shock happens. The balance you carried interest-only now has to amortize. Many borrowers blame a rate move for the jump. Most of the jump is the shift from interest-only to principal and interest on the same balance. Lendmire’s breakdown of the principal payment rules during the draw period explains why some plans build principal in earlier.
A lock moves part of that shock forward on purpose. You start paying principal on the locked slice now, while your income and the property are known. You trade a higher monthly cost today for a smaller surprise later.
Where the General Rule Breaks
The general rule is that conversion is a draw-period option inside the plan. These cases break it.
Your plan has no lock. Nothing requires a lender to offer one. The CFPB’s commentary on open-end credit treats a fixed-rate conversion option as something that must be disclosed if it exists. It does not require the option. Practically, a creditor cannot simply change your terms later, so a lock must be written in at the start. If it is not in your agreement, your options are a refinance or a replacement line.
You are already in repayment. The feature is generally a draw-period tool. Borrowers past that point usually cannot lock.
The fixed figure prices above variable. A locked segment can cost more than your current variable cost. Check the pricing method before you commit.
The plan builds in principal. Some plans include principal in the minimum payment from day one. Then the shock at repayment is smaller, and a lock matters less.
The line sits on a rental. Equity lines on investment properties are a narrow product. BiggerPockets members describe few lenders and limits on LTV, ownership, and property type. A lock on a non-owner-occupied line is therefore not something to assume. Treat that as anecdotal and confirm it plan by plan.
The line is on a network program. This is the case that matters for anyone working with Lendmire, covered next.
How Lendmire’s Network Lines Handle This
Lendmire is a broker. It places standalone equity lines through select wholesale partners, in either first or second lien position. The lender sets the final terms after a full file review.
There are two draw structures. The 3-year-draw program pairs a three-year interest-only draw with a 17-year fully amortizing repayment. Investment properties run the 5-year structure only. On both, at least 75% of the line is drawn at closing.
Here is the part that answers your question directly. Pricing on both programs floats across the draw and the repayment period. It never converts to fixed. There is no lock window, no sub-loan, and no segment cap, because the feature does not exist on these lines.
Leverage depends heavily on how the property is used, so the table separates occupancy. Every figure is subject to lender guidelines and full file review.
| Occupancy | Top CLTV | Minimum credit | Maximum line |
|---|---|---|---|
| Primary residence | 90% (only at 720+) | 600 | $750,000 |
| Second home | 90% (only at 720+) | 640 | $500,000 |
| Investment property | 70% | 700 | $500,000 |
A few more points shape the decision:
- CLTV is combined loan-to-value, meaning all liens on the property measured against its value.
- Debt-to-income is capped at 50%, and it is qualified on the interest-only payment calculated at the maximum draw.
- Title must be held by an individual or a revocable living trust. An LLC cannot hold title on these lines.
- These lines are available only in Lendmire’s 16 full-service states, which is narrower than its 41-market DSCR footprint.
So when a borrower asks how to fix the payment on one of these lines, the honest answer is that you cannot. You plan around the floating cost, or you choose a different tool.
Should You Lock? A Practical Decision
If your plan offers a lock, the question is whether you value certainty more than flexibility.
Locking tends to make sense when the draw is large and you will carry it for a long time. It also fits when you are approaching the end of the draw period and want to spread the transition. BiggerPockets members who use equity lines for down payments advise locking the cost and confirming the property still cash-flows. That is investor opinion, not a rule, but the logic holds.
Locking makes less sense when you plan to pay the draw back soon. A BRRRR-style exit, where you refinance out of the line, rarely needs a long fixed segment. You would be paying for certainty you will not use. This one is a genuine toss-up for borrowers in the middle: holding a variable balance for a few years carries risk, but locking early carries cost.
Also check how a lock changes your qualifying picture. Lenders look at your overall debt, and a conversion changes the payment on that slice from interest-only to amortizing. Ask any new lender how they treat it before you lock ahead of a purchase.
When a Rental Needs a Fixed Payment
If the goal is a stable payment on a rental, an equity line is usually the wrong structure for a long hold. A line is a bridge. It works well when you can refinance out of it.
A DSCR loan is built for the long hold. DSCR stands for debt service coverage ratio. It compares a rental’s income to its monthly obligation, which is principal, interest, taxes, insurance, and any HOA dues (together, PITIA). The lender checks whether the rent covers that payment, and the loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines.
The spine of the DSCR network is the 30-year fixed. A cash-out refinance on a standard rental tops out around 75% LTV across most of the network, with about six months of seasoning as the common expectation. You swap a floating line for a fixed term, and the payment stops moving. The exact numbers vary by lender and program and follow a full review of property, leverage, and credit.
On coverage, 1.00 is where many select programs start. A separate select-lender path takes coverage below 1.00, with leverage and terms adjusted. Stronger ratios open better pricing and leverage. Most programs want a credit score around 660, and 700 and above unlocks the strongest tiers. Clearing 1.00 is not the same as positive cash flow, because repairs, vacancy, and management sit outside the ratio. The complete DSCR loans guide walks through the full qualification picture.
One more interaction is worth knowing. A line on a different property does not change the ratio on your subject rental. It does affect your liquidity and reserves picture, and any lien on the subject property itself matters in underwriting. Tax treatment varies; consult a qualified professional.
Key Terms Defined
Draw period: The early phase of a HELOC when you can borrow, repay, and borrow again, usually paying interest only.
Repayment period: The later phase when drawing stops and the balance amortizes into regular payments.
Fixed-payment lock: A plan feature that converts part of your drawn balance into a sub-loan with a set term and schedule.
Amortizing: A payment structure where each installment covers both interest and principal.
CLTV: Combined loan-to-value, the total of all liens measured against the property’s value.
Payment shock: The jump in your monthly cost when interest-only payments give way to principal and interest.
Frequently Asked Questions
Can I convert my HELOC to a fixed payment whenever I want?
Usually only during the draw period, and only if your plan includes a lock. The window, minimums, and caps all come from your agreement. Once you are in repayment, the option generally disappears, and your alternative is a refinance.
Does a lock convert my whole line?
Most locks convert a drawn amount you choose, not the entire line. The rest stays variable and available. That is why a lock often leaves you with two payments at once: the fixed sub-loan and the minimum on the variable balance.
Why would the fixed payment cost more than my variable payment?
Two reasons. A locked segment is priced for certainty, so it can come in above your current variable cost. It also amortizes, so you start paying principal on that slice. Both raise the monthly figure in exchange for removing payment shock later.
Do Lendmire’s network equity lines ever convert to fixed?
No. Pricing on both network programs floats across the draw and repayment periods. If you want a fixed payment on a rental, the practical route is usually a DSCR cash-out refinance on a long fixed term, subject to lender guidelines.
Can I get a lock on a HELOC secured by a rental property?
It is not something to assume. Equity lines on investment properties are limited, and lender policies differ widely. Ask for the addendum before you rely on a lock feature.
Want to See How the Numbers Work?
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. For a rental you plan to hold, it can also show how a fixed-term DSCR refinance compares, and every option is subject to lender guidelines and not a commitment to lend.
A lock only matters if your plan has one, and the quickest way to find out is to read the addendum before the draw period ends.
About Lendmire
Lendmire (NMLS# 2371349) is a mortgage brokerage serving homeowners and real estate investors in its 16 full-service states. Home equity lines of credit are arranged through wholesale lending channels; Lendmire brokers the line and the lender underwrites each application under its occupancy-based guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
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References
1. Bankrate: HELOC with a fixed-rate option
2. Yahoo Finance: how fixed-rate HELOCs work
3. CFPB open-end credit commentary on HELOC conversion options
4. BiggerPockets: HELOC on an investment property
5. BiggerPockets: HELOC for a down payment
This article is part of Lendmire’s HELOC & home equity loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Can You Have a Cosigner on a HELOC? · HELOC Term Length Rules for Draw and Repayment Phases · HELOC Payoff and Release Rules When You Sell Your House
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
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Compliance and disclosures. Lendmire (NMLS# 2371349) is a licensed mortgage broker and is not a direct lender, depository institution, financial advisor, or tax professional. Content in this article is general market analysis and educational information — not financial, legal, or tax advice for any specific situation. Lendmire does not guarantee loan approval; every transaction is subject to underwriting by the funding lender. Mortgage pricing and loan program guidelines are subject to change at any time without notice and vary by borrower characteristics, property type, and state regulations. Lendmire complies with Equal Housing Opportunity. Licensure verification: NMLS Consumer Access.