What does flat or falling home values do to your equity?

A resilient scenario survives flat or soft markets. A fragile one only works at the optimistic path.

The point of running this calculator isn't to predict your market. It's to see how dependent your buying decision is on appreciation. If your scenario produces a defensible outcome at 0% appreciation — which is what flat markets actually do — you've bought with margin. If your scenario only produces a positive return at +5%/yr, you've made a bet on appreciation that may or may not pay off. Both are legitimate; only one is conscious.

What the verdict colors mean

• Resilient (green) — all four scenarios produce positive net proceeds. Your scenario absorbs flat or soft markets without losing money. This is what longer holds, larger down payments, and lower-leverage purchases tend to produce.
• Sensitive (yellow) — one or two scenarios go negative. Your scenario depends on at least neutral market conditions to break even. Common in the 5-7 year hold range with 5–10% down. Workable but worth knowing.
• High downside exposure (red) — three or four scenarios go negative. Your scenario only works in optimistic markets. Common in short holds (3–5 years), low down payments (5% or less), and high-leverage purchases. The math is fragile.

Why the default scenario is sensitive — by design

The default ($425K, 10% down, 6.75%, 7-year hold) intentionally produces a yellow or red verdict, depending on selling costs. That's not a calibration mistake — it's the typical first-time-buyer setup, and it's structurally fragile. Most U.S. buyers don't realize this because consumer mortgage content rarely models downside scenarios. The point of running the calculator is to see your specific configuration's exposure, then decide what to change.

The three knobs that move the verdict most

1. Hold period. Doubling hold from 5 to 10 years usually flips a yellow scenario to green. Mortgage paydown compounds; selling costs become a smaller share of equity. Long holds are the dominant defense against downside.
2. Down payment size. Going from 5% to 20% reduces leverage from 20x to 5x. The same -5%/yr scenario that produces deep negative equity at 5% down stays positive at 20% down.
3. Selling costs assumption. 8.5% is the typical bundled cost. In your specific market, run 9-10% if you're not sure, and run 12% if you might need to sell into a slow market with concessions. Higher selling costs are the under-modeled risk in most planning.

What to do with a red verdict

Red doesn't mean "don't buy." It means "this configuration is bet-on-appreciation." Three honest responses:

• Plan for a longer hold. If your scenario goes green at 10 years and red at 5, the right answer is "only buy if you can hold 10." Buyers who can't articulate why they'd hold long shouldn't buy with high-fragility configurations.
• Reduce leverage. Larger down payment, less house, or both. A red scenario at 5% down often goes yellow or green at 15-20% down.
• Build deeper reserves before buying. Reserves don't change the calculator output, but they change what happens to you if the calculator's pessimistic scenarios actually occur. A red scenario with 12 months of reserves is a different bet than a red scenario with 0 months.

Buying intentionally beats buying optimistically. Either choice can produce good outcomes; only one of them protects you when the optimistic case doesn't show up.