A first lien HELOC is a revolving credit line secured in first position that replaces a traditional first mortgage entirely. Instead of a fixed monthly payment against a fixed balance, the borrower deposits income into the HELOC account, reducing the outstanding balance and daily interest, then draws for expenses as needed.
How the Daily Interest Model Works
Interest accrues daily on the outstanding balance rather than monthly on a fixed principal. Every dollar deposited into the account reduces the balance and cuts the daily interest charge. Every dollar drawn increases the balance and interest. The result: a borrower who consistently maintains a positive cash flow position pays down principal faster than on a traditional mortgage with the same rate. The math works only when income consistently exceeds spending during the month.
Who Offers First Lien HELOCs
- ✦This product is not available through conventional retail or wholesale lenders
- ✦A small number of lenders, primarily in the digital lending space, offer this structure
- ✦Qualification standards are similar to a traditional first mortgage: CLTV typically capped at 80%, full income documentation required
- ✦These products are not eligible for sale to Fannie Mae or Freddie Mac as currently structured and are portfolio held by the originating lender
Variable Rate Risk
First lien HELOCs carry a variable rate, typically tied to Prime or an index. In a rising rate environment, the rate can increase significantly, narrowing or eliminating the cash flow advantage over a fixed first mortgage. A borrower who locks a 30-year fixed at a favorable rate and later considers a first lien HELOC refinance must weigh the certainty of the fixed rate against the potential accelerated payoff if they maintain strong positive monthly cash flow.
Client Fit
- ✦Best fit: high earners with consistent W-2 or business income who routinely maintain a large monthly surplus
- ✦Poor fit: borrowers who spend close to their monthly income, as the daily interest savings will be minimal
- ✦Poor fit: borrowers who strongly prefer fixed-rate certainty over variable-rate flexibility
- ✦Good fit for: business owners who receive large periodic deposits and want to use those balances to offset mortgage interest between draws
Aria can model first lien HELOC vs. traditional mortgage scenarios for a given borrower income and spending profile. Ask at vicariointel.com.
7-day free trial. No credit card required.
Ask Aria to Model First Lien HELOC Scenarios →