Listing Reality Check.

The number on the listing was never meant to plan a life around.

When you see a "$2,800/mo" estimate on Zillow or Redfin, you're seeing a marketing number. It's calibrated to make the home seem accessible, not to tell you what your bank account will look like a year after closing. The Listing Reality Check exists to put the missing pieces back.

What listing-site estimates almost always include

• Principal and interest, computed at a national-average rate that may not be your rate.
• A property tax estimate — usually based on the previous assessed value, not the value the assessor will set after you buy.
• Sometimes a token homeowners insurance number, often $50–$80 per month, often well under what an insurer will quote.

What they almost always leave out

• Maintenance reserve. The single largest hidden cost. For a $475K single-family home, that's roughly $396/month set aside for inevitable repairs and replacements.
• HOA dues. Usually missing entirely from listing estimates, even when the property has them. Texas master-planned communities, condos, and townhome developments often run $100–$500/month.
• Tax reassessment. If the previous owner held the property for ten years and the assessed value lagged the market, the post-sale property tax can be 30–60% higher than the listing estimate. This is especially pronounced in California (Prop 13 reset), Texas (annual reappraisal at sale), and Florida (Save Our Homes cap reset).
• Special assessments. Major capital projects voted by an HOA or condo board — roof replacement, foundation work, elevator overhauls — can add $200 to $2,000 a month for the duration of the assessment. They almost never appear on listing pages.
• Realistic insurance. Florida, Texas hail country, California wildfire zones, and coastal markets have seen insurance double or triple in five years. The token number on the listing rarely reflects current quotes.

Why the gap matters

A $700 monthly gap between what a buyer expects and what they actually owe doesn't just dent a budget — it changes which home is the right one. A buyer pre-approved for a $475K home based on listing-site estimates may discover after closing that the same home costs them $850 more per month than they planned. That's the difference between comfortable and house poor.

The Reality Check flips the order of operations: you start from the honest number, then decide whether the home fits.

How property type changes the math

Maintenance and insurance scale with how much of the building you're responsible for. A single-family home includes the roof, foundation, exterior, and yard — full reserve. A townhome typically shares some exterior responsibility — moderate reserve. A condo shifts most exterior maintenance to the HOA, so the personal reserve drops, but the HOA dues rise to cover what you no longer maintain directly. Insurance follows the same logic: SFH carries the highest baseline; condo unit-owner policies (HO-6) are the lowest because they cover only the interior.

Tax reassessment in plain terms

Most U.S. counties calculate property tax against an "assessed value" that the local assessor sets. When a home changes hands, that value typically resets — to either the sale price or some statutory percentage of it. If the previous owner held the home for years while values rose, their tax bill was based on yesterday's number. Yours will be based on today's. The gap can be enormous: a $500K home in Texas where the previous owner had a $320K assessment will see the tax bill jump from roughly $4,800/year to $7,500/year — a $225/month increase that the listing wouldn't have shown.

What to do with the gap number

If the Reality Check shows a $400/month gap, that's a manageable adjustment to your underwriting expectations. If it shows $900/month, you have a real decision to make: either the home isn't the right fit, or you need to look at the comfort band on the Affordability calculator to confirm the larger number still works for you.