The short version: three numbers decide whether a first-time buyer in South Carolina gets help: the program’s own cap, HUD’s income limit for the metro, and the FHA loan limit for the county. This page puts all three beside what a two-to-four-unit home costs in Charleston, the only South Carolina metro in the dataset, because a duplex you live in is the one purchase where the rent from the other unit counts toward qualifying.
The statewide program in South Carolina
The full 83-metro survey, with the programs that failed the two-to-four-unit test, is on the down payment assistance page.
Income limits for assistance in South Carolina, by metro
Why the limit moves: HUD sets a median family income for every metro each year and most programs cap eligibility at 80% of it. The published 80% figure is adjusted, so it is not always exactly 80% of the median. Charleston is the only South Carolina metro in the dataset; a buyer elsewhere in the state should look up that county’s own HUD figure.
| Metro | Area median income (4 people) | HUD 80% limit (4 people) | HUD 80% limit (1 person) |
|---|---|---|---|
| Charleston, SC | $117,500 | $94,000 | $65,800 |
What a duplex costs in South Carolina, and the income it takes
The part most buyers miss: in Charleston the income needed for the typical duplex sits above the four-person 80% limit, so the program reaches cheaper buildings than the median one. The income figure is FHA’s 31% front-end guideline on the typical duplex at 6.71% with 3.5% down, before the 75% rent credit a lender applies to the second unit.
| Metro | Duplex entry price | Typical duplex | Income needed (31%) | Versus the 80% limit (4 people) |
|---|---|---|---|---|
| Charleston, SC | $575,000 | $695,000 | $218,297 | over |
FHA loan limits in South Carolina for 2026
An FHA loan, the 3.5%-down loan most first-time buyers use, caps the loan by county and by unit count. The two-, three- and four-unit limits are higher than the single-family limit, which is why a duplex can be financed with the same small down payment at a higher price.
| Metro | 1 unit | 2 units | 3 units | 4 units |
|---|---|---|---|---|
| Charleston, SC | $690,000 | $883,300 | $1,067,750 | $1,326,950 |
Where these numbers come from
- Down payment assistance: state and local program pages, each checked for two-to-four-unit eligibility in the month shown; the 83-metro survey is published as open data.
- Area median income and the 80% limit: HUD FY2026 Income Limits (Section 8), huduser.gov.
- FHA loan limits: HUD CHUMS CY2026 forward limits by county, one- to four-unit columns.
- Duplex prices: the Foothold dataset, active two-to-four-unit listings screened Jun-Aug 2026. Income needed: FHA 31% front-end guideline at 6.71% (Freddie Mac 30-year average), 3.5% down, county tax rate and modeled insurance.
- All of it, as one file: the open data page (CC BY 4.0).
Program terms change without notice and eligibility has more tests than income. Verify on the program page and with a participating lender before you count on any of it.
Questions people ask about buying a first home in South Carolina
Does SC Housing Palmetto Home Advantage allow a duplex?
SC Housing Palmetto Home Advantage was usable on a two-to-four-unit home when checked in August 2026: it offers 3% or 4% of the total first mortgage loan amount to eligible owner-occupant buyers, and the building has to be one you live in. Program terms change, so confirm on the program page before you write an offer.
What is the income limit for down payment assistance in South Carolina?
The income limit most South Carolina assistance programs use is HUD’s 80% area median income figure for the metro, which for a four-person household is $94,000 in Charleston for FY2026. Smaller households get a lower figure; $65,800 for one person in Charleston.
What does a duplex cost in Charleston?
Charleston is the only South Carolina metro in the dataset; the entry price for a two-to-four-unit home that passed the screen is $575,000 and the typical one is $695,000. Entry means the 25th percentile of surviving listings, not the cheapest building on the market.
Get started with the newsletter!
Useful, relevant analysis, tools, tricks, and what you need to know on the journey to financial freedom. From the van years to a duplex, the plain math and none of the hype.
Subscribe and get the free $0-to-First-Property Roadmap to start.
No spam. Unsubscribe in one click.
Want the deeper toolkit? The guides and spreadsheets are in the shop, from $5, and the free tools stay free either way.