The Cook County Assessor reassessed the entire City of Chicago in 2024, the first city-wide pass since 2021. For investor properties — which fall outside the homeowner exemption and the senior freeze — the reassessment translated into a specific, measurable shift in carry costs that flows directly into every flip pro forma between now and the 2027 reset.
The mechanics matter. Cook County uses a tri-annual reassessment cycle: City of Chicago townships, north/northwest suburban townships, and south/southwest suburban townships each get reassessed every three years. The 2024 city-wide reassessment is the new baseline for property taxes in 2025, 2026, and 2027 tax years. Any flip that closes during this window inherits the assessed value set in 2024 — whether the buyer is an owner-occupant or another investor.
For investor-classified property (class 2 residential at 10% assessment ratio, class 2-11 small multi-unit, class 3 larger multi-unit at 16%), the 2024 reassessment increased citywide assessed values by an average of 25-35% on residential — though the actual range across neighborhoods was extreme. Some West Side neighborhoods saw 40-55% increases off the 2021 base. Some North Side neighborhoods saw 15-22%. Logan Square graystones moved 28-34% on average. Pilsen 2-flats moved 30-40%.
The financing math: a $300,000 Logan Square 2-flat that paid $4,800 in 2023 taxes (effective rate ~1.6%) now pays approximately $6,400-$6,800 under the 2024 reassessment — call it an additional $1,600 per year in carry cost. On a 6-month flip, that's roughly $800 in additional carry. On a 12-month BRRRR hold pre-stabilization, $1,600 in additional carry, which translates to 5-8 basis points of effective DSCR impact at refi.
Smart Chicago flippers are doing three things in response. First, they're modeling tax cost based on assessed value plus expected appeal, not the seller's current tax bill — sellers carry the homeowner exemption that a buyer-investor will lose. Second, they're building 30-45 days of appeal-window timing into the acquisition strategy, particularly for properties in townships where the assessor's door is open at acquisition. Third, they're working with a contingency-fee property tax attorney across their entire Chicago portfolio rather than per-property, which materially lowers the marginal cost of each appeal.
The next major reset for Chicago is 2027. Until then, the 2024 assessed values rule. For DSCR borrowers refinancing into long-term financing in 2025-2027, the tax line is locked in: factor it conservatively, and consider whether an appeal in year 2 of the cycle improves cash flow enough to justify the contingency fee at year 3 stabilization.
For investors comparing City of Chicago neighborhoods to suburban Cook townships (which reassess on different years), the asymmetry creates timing opportunities. A suburban Cook township reassessing in 2026 — Berwyn, Cicero, Oak Park, Proviso, several others — will reset assessed values for tax years 2027, 2028, 2029. Investors who acquire in those townships in late 2025 lock in old assessed values for one more tax year before the new cycle hits.
Bottom line: Chicago reassessment cycles are predictable, and the 2024 reset is now locked in for three years. Build the post-reassessment, post-classification, post-exemption-removal tax burden into your underwriting model and you'll consistently outperform investors who underwrite off the seller's tax bill.
Educational content. Not legal, tax, or financial advice. Verify specific deal economics and tax mechanics with licensed professionals.