In Wynnewood, the Lower Millage Isn't Always the Lower Tax Bill

Two houses can both list a "Wynnewood, PA 19096" address and pay property tax to two different counties, two townships and two school districts. On the Lower Merion side, the combined 2026 rate is about 47 mills. On the Haverford Township side it is about 30. Most buyers comparing the two take that as a large and permanent discount on the Delaware County side.

It isn't one. The two millage rates are charged against assessments made in different decades. Lower Merion's assessments still reflect 1998 values. Haverford's were reset in 2021 and have been aging quickly since then. Once you put both numbers on the same footing, the side with fewer mills can carry the higher effective rate.

Two stacks of mills, one postal address

Every Wynnewood tax bill has three layers: the school district, the township and the county. These are the adopted rates for the current tax year.

On the Lower Merion side, the school district accounts for most of the bill. In the township's own 2025 breakdown, LMSD took 77.7% of a median home's real estate taxes. The township took 9.8% and the county took 12.4%. So a 3.5% school increase changes the bill more than an 8% township increase does.

Read on its own, the table says the Haverford side costs about 37% less. That reading depends on a mill meaning the same thing in both counties, and it doesn't.

What a mill is measured against

A mill is $1 of tax for every $1,000 of assessed value, and the two counties assess on very different schedules.

The Township of Lower Merion's 2026 budget says the last countywide reassessment in Montgomery County took effect in 1998, "at 100% of market value." Township owners "continue to pay real estate tax calculated on property values that were established in 1998." The township's example median single-family assessment of $287,600 "equates to a market value of $934,700." In other words, the assessment is a little under a third of what the house would sell for.

Delaware County did a countywide reassessment much more recently. The Pennsylvania Department of Revenue records an assessment-base change there effective January 1, 2021.

The state measures the gap between assessed and market value for each county with the common level ratio factor. The factor is the reciprocal of the ratio, based on sales data compiled by the State Tax Equalization Board. These are the factors in effect from July 1, 2026 through June 30, 2027:

• Montgomery County: 3.36, meaning assessments run at roughly 29.8% of market value on average
• Delaware County: 1.83, meaning assessments run at roughly 54.6% of market value on average

A Haverford-side mill is charged on an assessment that covers a much larger share of the home's market value. That is why the Delaware County side can raise the same revenue with fewer mills.

Putting both sides on the same ruler

Dividing combined millage by each county's factor gives a county-average effective rate, meaning tax as a share of market value.

1. Lower Merion side: 47.27 mills ÷ 3.36 ≈ 1.41% of market value per year
2. Haverford side: 29.64 mills ÷ 1.83 ≈ 1.62% of market value per year

Here is the same arithmetic for a hypothetical home worth $934,700, the market value Lower Merion uses for its median example, assuming it is assessed exactly at each county's average ratio:

These are illustrations, not quotes for any real house. The common level ratio is a county-wide average, and individual homes sit above or below it. That spread is likely wider in Montgomery County, where assessments rest on 1998 values. Two Lower Merion houses that sell for the same price today can carry very different assessments, depending on how each one was valued in 1998 and what has been added since.

The actual published bill is the only reliable number. Lower Merion's example median home, assessed at $287,600, paid $13,049 in 2025. At the rates adopted for 2026 and 2026-27, the same assessment works out to roughly $13,596. That figure is our arithmetic, not a township projection. On the other side, Haverford Township School District reports a median homestead assessed value of $310,715 for 2026-27. Neither county ratio describes any one house as accurately as its assessment multiplied by its own millage.

Why the comparison won't hold still

Part of the Haverford side's apparent advantage was the recent reassessment, and that advantage is wearing off. Delaware County's factor was 1.00 for 2021-22. It then rose to 1.37, 1.52, 1.63, 1.74 and, as of July 2026, 1.83. Each increase means market values are moving further ahead of the 2021 assessments. If the rates stay where they are, the effective rate drifts down as homes appreciate. The county's own budget shows that rates are not staying put. The 2026 county rate of 4.609 mills is what Delaware County called "a 19% revenue enhancement," averaging $185 a year for homeowners.

Lower Merion has its own pressure, and it comes from the assessed base. The township's estimated total assessed value fell 0.7% in 2025 and is projected to fall 1.2% in 2026. The budget attributes interim losses to "continued unfavorable real estate reassessments" and builds in projected successful assessment appeals. When the base shrinks, the millage has to rise to collect the same revenue, even if spending stays flat.

That rate has been rising. According to Main Line Media News, the township rate stayed at 4.19 mills for more than a decade. It then rose 6.5% for 2025 and 8% for 2026. The same September 2026 report says officials raised the possibility of a third straight increase for 2027. Township manager Ernie McNeely cited "headwinds," including $1.2 million spent on storms, among them the July 11 microbursts. The proposed 2027 budget is due in early November, so any listing's tax figure for next year is still unknown.

For a buyer weighing the two sides this fall, the gap is a figure that changes every budget season on both sides.

The transfer tax line to confirm at closing

Lower Merion's budget describes "a 2% tax on the sale price." One percent goes to the Commonwealth and the other 1% is split equally between the Lower Merion School District and the township. On the Delaware County side, the Recorder of Deeds lists 1% to the state and 1% to the municipality. The listed exceptions are Radnor, Upper Darby, Upper Providence and Chester City, and Haverford is not one of them. Haverford Township School District's 2026-27 budget also lists its own 0.5% real estate transfer tax.

Those two public sources don't make clear whether the school district's 0.5% is part of the local 1% or charged on top of it. That makes the Haverford-side total, 2% or 2.5%, a figure to confirm with the title company before settlement. On the Lower Merion side, the township's budget states the 2% total outright.

Knowing which side a house is on

The postal address doesn't settle it, and the neighborhood names don't map neatly onto the line either. The Haverford Township Historical Society groups Wynnewood Park and Wynnewood Gardens with Ardmore Park as Haverford Township neighborhoods. Its author also cautions that "it is hard to specify exact boundary lines" and that neighborhoods and post office areas "get confused." Haverford's draft comprehensive plan places a neighborhood commercial stretch along Haverford Road between Hathaway Lane and Wynnewood Road inside the township.

The parcel's county record is the reliable source. It shows the township, the school district, the assessed value and the millage that applies to that house.

FAQ

Is the Haverford side of Wynnewood cheaper to own? Not necessarily. At county-average assessment ratios, the effective rate in 2026 works out to about 1.62% of market value on the Haverford side and about 1.41% on the Lower Merion side. Individual homes vary, so the specific assessment matters more than either average.

Why do Lower Merion assessments look so low next to sale prices? They are still based on Montgomery County's 1998 reassessment. The 2026-27 common level ratio factor of 3.36 means assessments average roughly 30% of current market value.

Does Montgomery County have a new reassessment scheduled? We found no announcement of one. The township's 2026 budget still describes 1998 as the last countywide reassessment.

Comparing two Wynnewood homes on either side of the county line comes down to each one's assessment, millage and the budget votes coming up this fall and winter. Jordan Arnold can pull the county records for any homes you are weighing and walk through the tax picture with you in a confidential consultation. If you own on either side and want to know where your home's value sits against its assessment, request a free home valuation.

This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.