Plan the build-period cash flow before you break ground.
Many buyers are surprised by what they owe while the house is going up. Here is how payments work by program, how interest-only payments grow with each draw, and what else to budget for.
| Program | During construction (general) | When full payments start |
|---|---|---|
| FHA one-time close | In most cases no mortgage payments; interim interest typically built into the contract price | After completion and conversion |
| VA one-time close | In most cases no mortgage payments; interim interest typically built into the contract price | After completion and conversion |
| USDA one-time close | Payment reserve commonly set aside at closing | After completion and conversion |
| Conventional one-time close | Interest-only payments on funds drawn | After completion and conversion |
| Jumbo construction | Interest-only payments on funds drawn, in most cases | After completion and conversion |
| Investor and builder | Interest on drawn funds; some programs use an interest reserve | Loan is repaid at sale or refinance (business purpose) |
Your loan documents state exactly what is due and when. Program details vary and are subject to change.
Short answer: you pay interest only on the money released so far, not the full loan amount, so payments start small and rise as each draw is funded.
The math in words: monthly interest is roughly the amount drawn, times the annual interest rate, divided by 12. Because draws follow the build, the balance and the payment step up over time.
| Build stage (typical) | Share of loan drawn (illustration) | Interest owed vs a fully drawn loan |
|---|---|---|
| Lot and permits | Lot payoff or purchase, if financed | Lowest |
| Foundation and framing | About 25 to 40 percent | About a quarter to a third |
| Dry-in and rough-ins | About 50 to 70 percent | About half or more |
| Finishes | About 80 to 95 percent | Most |
| Completion | 100 percent | Full interest until conversion |
Math illustration only. Not a loan offer, rate quote, or payment estimate. Draw schedules vary by project and program.
Short answer: an interest reserve is money set aside at closing, inside the loan or from your funds, that pays the construction interest for you during the build.
Reserves are common on USDA one-time close (as a payment reserve) and on many investor and builder loans. A reserve keeps payments from coming out of your pocket each month, but it is part of what you borrow or bring to closing, so it still counts in the total project cost.
See construction loan cost overruns and delays and the draw process.
Educational illustration only. Not an actual client, loan offer, or commitment to lend.
A family in Placer County is building with a conventional one-time close loan while renting. During the first months, their interest-only payment is small because only the lot and foundation draws are funded. By the finish stage, most of the loan is drawn and the interest payment is close to its full level, on top of rent. They planned for this by keeping cash reserves equal to several months of rent plus the full interest payment, so a two-month delay in finishes did not strain their budget. A veteran in the same situation using a VA one-time close loan would typically not make mortgage payments until completion.
After 28 years, the cash crunch I see most is the overlap: rent plus construction interest plus property taxes in the last few months of a build. If you are not using FHA or VA, plan for that overlap from day one, and add a cushion for delays. It is the difference between a stressful build and an exciting one.
Answered by Ken Clark Jr., Certified Mortgage Advisor. Program availability and requirements vary and are subject to change.
It depends on the program. On FHA and VA one-time close loans, in most cases no mortgage payments are due until completion. USDA commonly uses a payment reserve. Conventional and most other construction loans require interest-only payments on funds drawn.
On conventional and most other construction loans, yes: you pay interest only on the amount drawn so far. Full principal and interest payments start after the home is finished and the loan converts.
Interest is charged on the amount drawn, not the full loan. Roughly, monthly interest equals the drawn balance times the annual rate, divided by 12, so payments rise as each draw is funded.
Money set aside at closing to pay construction interest during the build. It is common on USDA one-time close and many investor and builder loans, and it is part of the total project cost.
Typically yes. Property taxes on the land, and sometimes on the partly built home, are usually the borrower's responsibility as they come due during construction.
Guidelines change. Verify current program requirements with Ken Clark Jr. before relying on them for a transaction.
Disclaimer: This content is for educational purposes only and is not a commitment to lend, a guarantee of approval, or a rate quote. Loan programs, down payment requirements, terms, and eligibility depend on borrower, property, project, builder, and program qualifications, are subject to underwriting, and vary by state. Not all applicants or projects will qualify. Builder registration is a documentation review for program eligibility and is not an endorsement of any builder. Equal Housing Opportunity. Paramount Residential Mortgage Group, Inc. (PRMG), NMLS #75243. Ken Clark Jr., NMLS #225375. PRMG is licensed in 49 states, excluding New York.
Certified Mortgage Advisor and Branch Manager at PRMG Mortgage (NMLS #75243). 28 years in mortgage lending. Specializes in FHA, VA, conventional, DPA, jumbo, Non-QM, renovation, and construction financing for buyers and investors in Sacramento, New Jersey, and nationwide. PRMG is licensed in 49 states, excluding New York. Three-time Gold Award winner for Highly Reviewed Mortgage Team in Sacramento (2023, 2024, 2025). NMLS #225375.
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