Proposal A in Action: A Real-Dollar Example of How Tax Uncapping Hits Macomb County Home Buyers

When you buy a home in Macomb County, your first-year property tax bill will almost certainly be higher — often significantly higher — than what the seller paid last year. That's Proposal A in action, and understanding it before you close could save you hundreds or thousands of dollars in budget surprises.

How Proposal A Creates Two Different Tax Realities

Michigan's Proposal A, passed in 1994, split property taxation into two numbers that move independently: **Assessed Value** and **Taxable Value**.

• **Assessed Value** represents roughly 50% of estimated market value. It can move freely based on local market conditions.

• **Taxable Value** is capped for existing owners. Each year, it can only increase by the Inflation Rate Multiplier (IRM) or 5%, whichever is lower.

Here's the critical detail: when a property sells, taxable value **uncaps** and resets to match assessed value in the following tax year. That's the moment a buyer's tax reality diverges sharply from the seller's.

The Macomb County Numbers, Side by Side

Macomb County's own assessment data makes Proposal A in action: a real-dollar example of how tax uncapping hits Macomb County home buyers crystal clear.

| | Assessed Value | Taxable Value |

|---|---|---|

| **2025 (Seller)** | $200,000 | $200,000 |

| **2026 (Seller, no sale)** | $224,000 (+12%) | $205,400 (+2.7% IRM) |

| **2026 (Buyer, post-sale)** | $224,000 | $224,000 (uncapped) |

The 2026 IRM is 2.7%, so a seller who stays sees their taxable value rise only $5,400. A buyer who purchased that same home now has a taxable value of $224,000 — an $18,600 difference from what the seller would have paid taxes on.

At a combined millage rate of roughly 40 mills (common across many Macomb County municipalities), that $18,600 gap adds up to approximately **$744 more per year** in property taxes for the buyer — before any other adjustments.

This same dynamic applies across Novi, Troy, and virtually every community in Metro Detroit. The math changes by millage rate, but the mechanism is identical everywhere in Michigan.

What This Means For You

• **Don't rely on the seller's tax bill to estimate your own.** It's one of the most common — and costly — mistakes buyers make.

• **Ask your agent or lender to recalculate taxes based on the purchase price**, not the current tax record. Your mortgage payment estimate depends on it.

• **Corporate relocation buyers take note:** If you're relocating to the Metro Detroit area and budgeting from a previous state's tax model, Michigan's uncapping rules add a layer of complexity worth understanding before you sign.

• **Existing homeowners benefit from Proposal A's cap** — it's one of the real financial advantages of staying put in a rising market. Find out what your home is worth →

The gap between what a seller pays and what a buyer will pay isn't a mistake or an oversight — it's exactly how Michigan property tax law is designed to work. Knowing that before you make an offer puts you in a far stronger position.

For a deeper look at how local assessments and purchase decisions connect, visit our blog for more Metro Detroit market breakdowns.

Frequently Asked Questions

Does taxable value uncap the same year I buy the home?

No — the uncapping takes effect in the tax year following the sale. If you close in 2025, your taxable value resets to assessed value for the 2026 tax year. That's when your higher bill kicks in.

Can I appeal my assessed value after I buy a home in Macomb County?

Yes. You have the right to appeal your assessed value to the local Board of Review, typically in March of the assessment year. An appeal can be worth pursuing, especially if the assessed value appears to exceed 50% of actual market value — but it does not restore the cap that the previous owner had.

Is the tax uncapping rule the same across all Metro Detroit communities?

Yes — Michigan's Proposal A applies statewide, so the uncapping mechanism works the same whether you're buying in Macomb County, Oakland County, or Wayne County. The difference in your actual tax bill comes down to each municipality's millage rate, which varies by city, township, and school district.

Source: macomb-mi.gov