How to Plan Cash Flow for a Portfolio HELOC Entering Repayment

The Quick Read: When a draw period ends, an interest-only line becomes a fully amortizing loan on the balance you already owe, so the monthly cost steps up while rents usually do not, and the safest plan is to model the new payment against each property’s rent, build a reserve, and pick an exit well before the date. Most of the line is typically drawn on day one, so plan around the full balance. Every figure below is subject to lender guidelines and full file review.

• The repayment payment, not the interest-only payment, is the budget number from day one.
• Three inputs drive the jump: the balance, where the line’s floating pricing sits, and the length of the repayment term.
• Clearing 1.00x on the first mortgage does not mean the rental still cash flows once the line’s payment is stacked on.
• The exits are to pay down, refinance into a DSCR cash-out, sell, or renegotiate, and each has its own lead time.
• On Lendmire’s network, an investment-property line runs a 5-year interest-only draw and a 25-year fully amortizing repayment.

Key Terms Defined

Draw period: The stretch when you can borrow against the line and usually pay interest only. New draws stop when it ends.

Repayment period: The stretch after the draw, when the balance is paid down through principal-and-interest payments, or in some lines through one balloon payment.

Amortization: A payment schedule that retires the balance by the end of the term, so each payment includes principal.

Payment shock: The jump in the monthly payment when principal joins the interest-only payment.

CLTV (combined loan-to-value): Your first mortgage plus the line, divided by the property’s value.

DSCR (debt service coverage ratio): Monthly rent divided by the property’s monthly housing obligation: principal, interest, taxes, insurance, and any association dues. It qualifies a loan primarily on property-level rental income covering the payment, subject to lender guidelines.

Portfolio HELOC: here, a home equity line secured by a rental you own, used by an investor who carries several properties. It does not mean a lender-held portfolio loan, although some lines are held by the lender that made them. The cash-flow planning is the same either way.

What Changes on the First Day of Repayment?

Four things change at once. New draws stop, the balance freezes, the payment gets recalculated, and the amortization clock starts running. Experian describes the frozen balance and notes that some lines make the whole balance due at the end of the draw, while others amortize over a repayment period.

Market-wide, that source describes a draw of about five to 10 years followed by a repayment period that is often 20 years. On the investment lines Lendmire brokers, the structure is a 5-year interest-only draw followed by a 25-year fully amortizing repayment. Pricing floats through both phases and never converts to fixed.

There is no grace period built into this math. The first payment is calculated on the balance you carry, over the remaining term, at wherever the line’s floating pricing sits that month. If pricing moved up during the draw, the step-up is larger than it looked on day one.

Here is the planning catch. The network requires at least 75% of the line to be drawn at closing, so the balance you repay is usually close to the full line. Do not assume you will have paid it down.

How Do You Find Your Own Dates and Formula?

Your agreement is the primary document, and generic “10 plus 20” patterns are only common shapes. The federal rule for home equity plans, 12 CFR 1026.40, requires the lender to disclose the length of the draw and any repayment period. It also requires an explanation of how the minimum payment is set, a warning if minimum payments may not repay principal, and any caps on how far pricing can move.

Pull these items from your agreement and put them in one row of a spreadsheet:

• The draw-end date and the length of the repayment term.
• The index, the margin, and any annual or lifetime caps.
• Whether the end state is amortization or a single balloon payment.
• Any prepayment terms, since Experian notes some lenders charge a penalty for paying off early.
• Whether a fixed-pricing conversion option exists. The network’s investment lines do not offer one.

The CFPB’s HELOC brochure adds two warnings worth planning around. Payments can change even if you draw nothing more, and a balloon has to be met by refinancing or another source of funds. A balloon rarely announces itself with that word, so read for any single payment due at the end.

What the Network’s Investment Line Looks Like

Knowing the guardrails tells you what you can refinance into and what you cannot. Across the wholesale network Lendmire places files with, an investment-property line has these typical parameters:

• Maximum 70% CLTV on an investment property, with a 700 minimum credit score.
• Line sizes up to $500,000 total. There is no tier above that for investment property.
• A 50% maximum DTI (debt-to-income ratio), qualified on the interest-only payment calculated on the maximum draw.
• Title held by you individually or in an inter vivos revocable living trust. An LLC cannot hold title on the line.
• A borrower limit of three lines, plus combined-exposure caps and a ceiling of 15 financed properties.
• Availability limited to a narrower set of states than the DSCR footprint.

A true HELOC is underwritten on personal credit, DTI, and CLTV. The DSCR ratio plays no role in approving it. That is the sharpest structural difference from a DSCR loan, and it is why the repayment step-up lands on your personal file as well as on the property.

Many products sold as a “DSCR HELOC” are really rent-qualified cash-out refinances that pay off the first lien. Lendmire’s piece Can an LLC Portfolio Investor Get a DSCR HELOC on Rental Cash Flow? covers that naming confusion in depth.

Build the Cash-Flow Bridge

The bridge shows the property in three states: first mortgage only, line in the draw period, and line in repayment. Work through it on each property, then combine them. The inputs below are modeled assumptions, not market data.

Start with monthly rent. Subtract vacancy, repairs, management, utilities, and a capital reserve to get net operating income. Subtract all debt service on the property. What is left is the surplus or shortfall. You can also express the same picture as a ratio of rent to total debt service.

Now picture a rental that clears roughly 1.25x on its first mortgage alone. Assume the line’s interest-only payment adds about 15% of rent in debt service, and the amortizing payment adds about 30%. The combined coverage works out like this:

Combined coverage here is not a DSCR on a new loan, since a DSCR looks at one property’s own housing obligation. It is a planning ratio that adds every payment the rent has to carry. The 1.05x row is already thin, because repairs, vacancy, and capital costs sit outside that ratio. A rental can clear 1.00x and still lose money each month.

If the line is secured on one property but funded other purchases, run the bridge twice. The first run keeps the payment on the collateral property, where the lien sits. The second spreads it across the portfolio, since your actual cash comes from all the rents together. A portfolio that looks fine in the second view and strained in the first tells you to pay down the line from the stronger properties’ surplus.

Stress-Test the Rental, Not Just the Payment

Test four things, one at a time and then together: pricing up, vacancy up, rent flat, and a large repair. Because pricing floats and never converts to fixed on these lines, any pricing move flows straight into the payment. Use a grid across balance, pricing level, and remaining term, then read the result against thresholds you set in advance.

These bands are planning thresholds you set for yourself, not lender requirements. The thin middle band deserves the most attention, because small changes in vacancy can push it into the bottom row.

A drawn balance also affects your next purchase. Open lines count toward the network’s line-count and combined-exposure caps, and the payment counts in DTI on any later borrower-based file. A step-up that fits your cash flow can still crowd out financing for the next deal.

The Reverse Timeline

Work backward from the draw-end date. The tasks below fit most files, though your own start dates should reflect how much cushion the numbers leave.

A recent cash-out refinance on the same property can complicate a new line, and a first mortgage may restrict a second lien. Sequencing matters, so check the order of liens before the final stretch.

Choose Your Path

The right exit depends on how the bridge looks. Compare these options on when they fit and what to watch.

The DSCR cash-out path deserves a closer look. On a standard rental, cash-out refinances top out around 75% LTV across most of the network, and on short-term-rental collateral the ceiling is 70%. About 6 months of seasoning is the common expectation. Most programs want a score around 660, and 700 or better opens the strongest leverage tiers.

The line must be paid off or subordinated before the first mortgage on that property can be refinanced. Size the coverage on the new, larger payment. For many investors, 1.00x is where select programs start, and a separate select-lender path takes coverage below 1.00x with leverage and terms adjusted. A DSCR cash-out can also close in an LLC, subject to lender program eligibility, which a HELOC on these programs cannot.

Lendmire’s complete DSCR loans guide explains how rent-based underwriting works end to end.

Where the General Rule Breaks

• Balloon lines. The network’s investment lines amortize, but other lines can end with one payment. If the agreement shows an interest-only draw and no repayment period, a balloon applies, as the CFPB’s commentary on the rule lays out.
• Renewals. The lender may invite you to renew, but you cannot count on it. The CFPB brochure says the same.
• Entity title. A property already deeded to an LLC needs a vesting change before it can carry the line, or a DSCR cash-out instead.
• Heavy draws. A line that is mostly drawn is a real balance to clear when you later refinance that property.
• Smaller lines. A modest balance may produce a step-up you can absorb, and a fully drawn $500,000 line may not.

Reserve and Paydown Strategy

Fund the reserve first, then pay down. A reserve sized to cover several months of the new payment on the weakest property protects you from vacancy while the step-up is fresh. Extra principal during the draw lowers the repayment payment directly, because the interest-only phase never reduces the balance.

Fund the paydown from rental surplus before you reach for a sale or refinance, and send it to the property or line where it lifts combined coverage the most. 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.

Questions to Ask Your Servicer

• On what date does the payment recalculate, and what formula sets it?
• Is the end state amortization or a balloon?
• What are the annual and lifetime pricing caps, if any?
• Is there a prepayment penalty, and how is it calculated?
• Does the lender offer a renewal, extension, or modification, and on what terms?
• Will the lender send notice before the draw ends?

Mistakes to Avoid

• Planning only around the interest-only payment.
• Treating 1.00x coverage as positive cash flow.
• Assuming a refinance will always be available at the moment you need it.
• Forgetting that the lien sits on a real property you could lose.
• Waiting until the final months to price the exit.

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. Investors can reach the team at 828-256-2183. The site’s illustrative calculator gives a rough estimate, not a quote.

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.

References

1. Experian: what is a draw period on a HELOC

2. 12 CFR 1026.40, eCFR

3. CFPB HELOC brochure