Section 3: Earned income and Net Profits Tax

Under Pennsylvania law, municipalities and school districts are authorized to impose taxes on the earned income of their residents. Municipalities other than school districts also are permitted to levy the tax on non-residents employed within the municipality.

As a general matter, with exceptions for the Pittsburgh School District and City of Philadelphia (more specifically discussed below), municipalities of residence have priority in the collection of the EIT/NPT paid by their residents, irrespective of place of employment, up to the amount of tax imposed by the “home” municipality. The EIT/NPT is imposed upon both “earned income” and the “net profits” of taxpayers. Corporations (both “C” corporations and non-wage/salary/compensation payments to shareholders of Sub-Chapter S corporations) are exempt from the EIT/NPT.

The exception to the general rule of credit being given to the “home” municipality of most interest to the Township is that imposed by the “Sterling Act” (53 P.S. 15971) which is the principal statute addressing the Philadelphia wage tax as it applies to non-residents. The Pennsylvania Department of Community and Economic Development (“DCED”) Local Tax Manual states,

By far the most extensive grant of nonreal estate taxing power to any political subdivision in Pennsylvania, and the earliest of this type, was conveyed to Philadelphia by the Sterling Act of 1932.  This act gives the city the authority to levy, assess and collect . . . such taxes on persons, transactions, occupations, privileges, subjects and personal property . . . as it shall determine....” [citing 53 P.S. 15971; 1932 (Ex. Sess.) P.L. 45]  The city may not levy or collect a tax on any subject preempted by a state tax or license fee, but otherwise there are no limits on the kinds of taxes Philadelphia can impose, no limits on the rates of those taxes, and no limit on the aggregate amount of revenue that can be raised.

Under the broad authority of the Sterling Act, Philadelphia has enacted taxes on wages, earnings and net profits, admissions to amusements, real estate transfers, parking lot receipts, mechanical devices, bowling alleys and sound reproduction.  The income tax imposed by the city applies not only to residents of the city wherever they may work, but also to nonresidents earning income within the city.  A 1977 law limited increases in the rate levied on nonresidents. [citing 72 P.S. 7359, Tax Reform Code, Section 359(b); Leonard v. Thornburgh, 489 A.2d 1349, 507 Pa. 317, 1985]  The split rate has been upheld by the Pennsylvania Supreme Court.

….

Municipalities are authorized to levy the earned income tax on nonresidents earning income within their jurisdiction.  However, the Local Tax Enabling Act requires the place of employment to grant a credit for any earned income tax levied at the place of residence. [citing 53 P.S. 6914; Local Tax Enabling Act, Section 14; Neshannock Township School District v. City of New Castle, 13 D.&C. 2d 255, at 262, 1957, C.P. Lawrence Co.]  In most cases, there will be a tax at the place of residence, so the ability to tax nonresidents does not constitute a significant source of revenue.

….

The exception to the priority given to the place of residence is persons subject to the Philadelphia wage tax.  The Local Tax Enabling Act requires municipalities to credit their residents for taxes paid to Philadelphia on income earned within the city. This credit, like the other credits …, is a direct reduction against the liability for tax owed by the taxpayer.  In a case where Norristown attorneys claimed a credit against liability for local taxes for taxes paid to Philadelphia on net profits earned within the city, the court upheld the taxpayers' interpretation.  The Norristown tax collector had attempted to calculate local tax liability as one percent on income earned locally, but the court held the credit meant a direct reduction from liability for the tax owed.  “Here, however, the Legislature said plainly that a tax paid to one taxing authority should be credited to the tax liability to the other taxing authority.” [citing Dunmire v. Applied Business Controls, Inc., 440 A.2d 638, 63 Pa.Cmwlth. 479, at 484, 1981.] The correct method of calculating the tax due was to take one percent of total taxable income then subtract the amount of tax paid to Philadelphia. [emphasis added].[i]

The Sterling Act often has been cited as a significant impediment to the imposition of an earned income tax by municipalities located in proximity to the City of Philadelphia, but over recent years more municipalities and school districts in southeastern Pennsylvania have decided to impose the tax.

Imposition of the Earned Income Tax and Net Profits Tax

 While there are details which pertain to both taxes, the following general standards apply with respect to the EIT/NPT:

Calculation of the Yield to the Township from the EIT/NPT

The collection of the EIT/NPT requires assessment of the various items of income and expenses which are proper deductions. However, the structure of the tax and the way it is collected makes it difficult to estimate revenues with precision.

Data Collection and Methodology - Municipalities in Berks, Bucks, Chester, Delaware, Montgomery and Philadelphia Counties identified by DCED as imposing an earned income tax collect the tax on their own, or through multi-jurisdiction cooperative arrangements or commercial tax collection services. Inquiries were made over a two-week period to tax collectors for each municipality in the 6-county region as to the number of Lower Merion residents employed in their jurisdiction levying the taxes.

The survey collected information on over 200 Pennsylvania municipalities which levy an EIT/NPT on non-residents, as well as 69 other jurisdictions. 63 municipalities were unable to respond, generally because the collectors do not distinguish among jurisdictions which do not impose an EIT/NPT, and those for which the municipality has no repayment obligation. The substantial majority of jurisdictions which were unable to respond are in Berks County. It should be noted that persons who work in more than one jurisdiction over the course of a year (whether due to locational changes for their employment or as a result of income and/or net profits being generated from several employers or clients in different areas) may produce some double counting, resulting in incremental over-reporting of the number of taxpayers. That factor is discussed in more detail below.

The imposition of the EIT/NPT on both residents and non-residents creates a universe of possible taxpayers of a Lower Merion Township-imposed EIT/NPT, which may be divided into categories of persons who:

  1. Live and work in the Township (Township entitled to EIT/NPT proceeds);
  2. Live in the Township, but work in Philadelphia (as provided in the Sterling Act, Philadelphia has first claim on non-resident EIT/NPT);
  3. Live in the Township, but work out of state  (Township entitled to EIT/NPT proceeds up to amount of Lower Merion EIT/NPT, but with some prospect for credits against Township for EIT/NPT as to liabilities to other states, depending on particular circumstances);
  4. Live in the Township, but work in a jurisdiction which either does not impose an EIT/NPT, or which does not impose it on non-residents (Township entitled to EIT/NPT proceeds);
  5. Live in the Township, but work in a jurisdiction which imposes an EIT/NPT on non-residents (Township entitled to EIT/NPT proceeds up to amount of Lower Merion EIT/NPT);
  6. Live in a jurisdiction which imposes an EIT/NPT and work in the Township (Township entitled to retain EIT/NPT to the extent it exceeds EIT/NPT of worker’s municipality of residence); and
  7. Live in a jurisdiction which does not impose an EIT/NPT and work in the Township (Township entitled to EIT/NPT proceeds).

With information for each category, it is possible to make an estimate of the return to Lower Merion Township from each.

Of the several categories, the allocation to the City of Philadelphia (#2) is the most problematic, in light of the absence of detailed current information from the taxing authorities in Philadelphia as to the specifics of non-resident wage tax collections from Lower Merion residents. While the data would become available as those persons notify the Township of payments to Philadelphia incident to claiming credit for the Township EIT/NPT, the information is not now available for estimation purposes.

Of some difficulty, but of substantially less financial significance, is the calculation of revenue which would be lost as a result of persons working in Lower Merion whose municipality of residence imposes an EIT/NPT. As the number of jurisdictions not assessing the EIT/NPT shrinks, the likelihood of the Township’s prospect for counting on being able to retain large amounts declines as well. Item 3, which pertains to those who work out of state, is most likely not statistically significant, and the 1990 census data indicates that to be the case. As well, the availability of credits in some cases makes this category a less reliable source of revenue.

Several approaches were taken to develop and support estimates, in addition to review of prior studies and estimates prepared by and for the Township, generally-available published materials, calculations received from two for-profit tax collection agencies: Berkheimer Associates, Inc. (“Berkheimer”) and Central Tax Bureau of Pennsylvania, Inc. (“Central”), and the survey noted above:

IRS Information - Data was secured from the United States Internal Revenue Service for calendar years 1997 and 1998 on a zip code basis, dividing taxpayers and their returns on Form 1040 into several categories, among them:

Census Information – Population and Income - Information was obtained from the Bureau of the Census for both 1990 and 2000, for both the Township and zip codes which overlap it. The availability of 1990 data, by both zip code and municipality, permitted development of a ratio of Township population and self-reported earned income to that found in the collected zip codes, thereby facilitating a comparison between the zip code-based IRS data. Attention also was directed to census tract maps and other supporting information.

Census Information – Employment - Given that the Census Bureau has not yet reported detailed employment data for 2000 in terms of minor civil division level information listing where persons are employed, examination was made of  journey to work and place of employment data from the 1990 census, including information gleaned from the 1990 Census Transportation Planning Package, published by the Bureau of Transportation Statistics of the United States Department of Transportation (the “1990 CTPP”). Using the 1990 CTPP, it is possible to ascertain commuting patterns, and although 2000 data would be preferable, aggregate Township population and resident employment figures have not changed substantially over the last decade. This information also permitted development of imputed values for employment in Philadelphia and for municipalities which were unable to provide detailed data.

Bureau of Labor Statistics – CPI and Employment -  Periodically issued information by the Bureau of Labor Statistics relates both to such topics as employment and unemployment, and the rate of inflation within the Philadelphia area. That information is of great value in assigning values to some types of financial data with respect to which an effort is being made to impute current and/or prior value(s).

Employment Calculations

There are several factors which come into play with respect to determination of the possible revenue yield to the Township due to imposition of an EIT/NPT. As noted above, critical to the analysis is a determination of where Township residents work, and particularly the number who work in the City of Philadelphia and other jurisdictions which have enacted an EIT/NPT. Another is weighing the impact of known changes of significance in regional workplace location since 1990, notably in the Malvern/202/422 corridors and Conshohocken/West Conshohocken areas.

There have been insubstantial changes in the population of the Township and in the number of Township residents who are employed since the 1990 census, with a 3.18% increase in total population (1,847), and a decrease of 3.93% (1,149) in the number of Township residents employed in the civilian workforce. The 1990 Census also revealed that of the 29,219 Township’s residents who are employed, 9,011 (30.84%) worked in Lower Merion Township and 20,208 (69.16%) worked elsewhere.[iv]

A distinction should be made between Philadelphia’s wage tax claim in terms of percentage of wages versus percentage of employees, particularly given the significant difference between Lower Merion’s average earned income per household ($130,322) and that amount in Philadelphia ($44,963). According to research conducted for the Pennsylvania Economy League, 37.7% of the wages of Lower Merion Township’s residents were earned in Philadelphia in 1999.[v] Township staff has estimated that 31% of its residents’ wages would be allocable to Philadelphia, and in information provided to the Township in July, 2002 Berkheimer estimated that figure to be 40%.

In a projection provided to the Township in 1991, Berkheimer used a similar factor for Philadelphia, and in 1992 the Pennsylvania Department of Revenue reported a Philadelphia employment percentage of 35%. The 1990 CTPP reported that 37.58% of employed Lower Merion residents worked in Philadelphia, but did not make a judgment as to earned income. While Philadelphia is estimated to have lost approximately 50,000 jobs in the aggregate from 1990 to 1997, employment levels in Center City, West Philadelphia and Southwest Philadelphia (thought to be likely employment locations for Township residents) is essentially flat, with less than .6% loss in employment.[vi]

Using the range of estimates from those sources, from the 31% developed by the Township to the figure used by others, an estimate of revenue loss due to Philadelphia employment has been made at 32% of earned income. An allocation of IRS-developed data (with adjustment for 1998-2001 inflation) using that percentage of income share shows that Lower Merion residents earned $952.2 million in Philadelphia in 2000, resulting in an estimate of 8,982 Township residents working in Philadelphia.

Table 3.1 – Locations of Employment of Lower Merion Residents

Of 28,070 Employed Township Residents…

Number

%

Worked in Lower Merion

8,657

30.84

Worked outside Lower Merion

19,432       

69.16

Philadelphia

8,982

32.00

Non-Philadelphia

10,450

37.16

Source: From 2000 Census with 1990 Census allocation Table P046. Place of Work --- Minor Civil Division Level, 1990 Summary Tape File 3 (STF 3) – Sample Data as to % employed in Township.

The 1990 CTPP reported that in 1990 Lower Merion Township residents worked in 117 different municipalities in Pennsylvania (other than the Township), and in 69 jurisdictions outside the Commonwealth. Of the Pennsylvania municipalities where Township residents were employed, 73 (69%) impose an EIT/NPT. Based on 1990 CTPP figures, 28.3% of  employed Township residents worked in jurisdictions which do not impose an EIT/NPT on non-residents.

The 1990 CTPP data also show that in 1990 Lower Merion was the workplace of 26,038 persons, of whom 18,184 were residents of other Pennsylvania municipalities. Although data are not presently available as to the number of persons from outside the Commonwealth who are working in Lower Merion Township, if the same figure as to Lower Merion residents working outside of Pennsylvania (4.64%) is applied to the total of Pennsylvania residents working in the Township, the result would be an aggregate employment figure of 27,246.

The EIT/NPT survey data is at variance with both the 1990 CTPP information and the results produced by application of the percentage allocation in Table 3.2, and while the variance is not material in terms of which EIT/NPT municipalities are currently collecting tax from Lower Merion residents, it is of significance in terms of those localities which are not imposing an EIT/NPT, and for whom the Township’s enactment of an EIT/NPT would create a new tax burden.

The survey showed that 7,084 residents of the Township paid EIT/NPT to municipalities other than Philadelphia in 2001. Notwithstanding the relatively large numbers of reported taxpayers, however, on the basis of IRS data the EIT/NPT tax revenue collected by non-Philadelphia municipalities was well below what would have been expected on the basis of aggregate wage and salary income per employed Merion Township resident. Employed Township residents earned $96,922 in 2000 on a per capita basis, and the local EIT/NPT tax collectors saw earned income of only $44,805. In an effort to reconcile the disparate data, and deal with part-time workers, persons working in more than one place and those who were employed in an EIT/NPT area for only a portion of the year, a “full-time equivalent” calculation based on per capita income was performed, producing a figure of 3,298 employees.

While many of the non-responding municipalities were geographically distant and for the most part not major employment centers, several (notably Conshohocken Borough, East Whiteland Township, and Plymouth Township) are known to be the workplace of large numbers of Lower Merion residents, and have had employment growth in recent years. The Delaware Valley Regional Planning Commission estimates 2000 employment levels for those jurisdictions to be 11.2% larger than in 1990,[vii] and the addition of that factor to the three jurisdictions noted above brings the total to 3,490. There also is a margin for intervening changes and statistical deficiencies built in to this calculation, in that the 1990 CTPP figures for Lower Merion Township residents working elsewhere totaled 2,532, a difference of almost 38%.

While 1990 CTPP information noted 5,322 Lower Merion residents working in municipalities not imposing the EIT/NPT on nonresidents, an adjustment of approximately 6% was made (to a total of 5,644) to take possible data inadequacies into account due to the length of time that has passed since the information was compiled and changes in the regional employment market.

Figures for residents of other areas working in Lower Merion are somewhat speculative. The 1990 CTPP reported that over 18,000 persons worked in the Township who lived elsewhere in Pennsylvania, but current figures are not available for non-Pennsylvania persons. The 1990 CTPP reported 11,536 persons with non-Lower Merion residency working in the Township, (8,354 of whom are from Philadelphia) who would not be liable for the Lower Merion EIT/NPT, and 6,648 persons were reported to be employed in Lower Merion from jurisdictions not imposing the tax. The final group would be liable to the Township for EIT/NPT. Table 3.2 provides an updated estimate of the distribution of employment among the seven categories on the basis of currently available information

Table 3.2 – Lower Merion Township Residents

and Others Who are Employed in Lower Merion Township

Persons who….

Number

Live and work in the Township

8,650

Live in the Township, but work in Philadelphia

8,982

Live in the Township, but work out of state

1,304

Live in the Township, but work in a jurisdiction which either does not impose an EIT/NPT, or which does not impose it on non-residents

    5,644

 

Live in the Township, but work in a jurisdiction which imposes an EIT/NPT on non-residents (other than in the City of Philadelphia)

    3,490

 

Live in a jurisdiction which imposes an EIT/NPT and work in the Township

11,536

Live in a jurisdiction which does not impose an EIT/NPT and work in the Township.

6,648

Total

46,254

Wage and Salary and Net Profit Calculations

Wage and salary figures are not regularly reported on a municipality level, which complicates the process of developing estimates of income for a locality which does not already have an income-based tax in place. Several alternatives were followed to determine an income level for Lower Merion Township.

Census Data – The Census Bureau compiles data from respondents to the decennial census as to income, which includes self-reporting on earned income on a household basis. In the 2000 Census, respondents in 18,454 households in the Township with mean earnings of $130,322 reported $2,404,962,188 in earnings.

IRS Information – As noted above, the Internal Revenue Service has made information available as to wage and salary income reported on Form 1040 for 1998, by zip code. Four zip codes are located wholly within Lower Merion, and eight others are shared with other municipalities (three have fewer than ten addresses in Township). Census information from 2000, by zip code, was compared with the boundaries of Lower Merion, and that in turn was compared with the IRS-supplied information and Census 2000 self-reported data to calculate that Lower Merion Township makes up 33.93% of the population of all zip codes which cover even a portion of the Township, and 48.35% of the wage and salary income. With that as a base, it was estimated that $2,558,820,000 was earned by Lower Merion residents from wages and salaries during 1998, and that figure is estimated to have risen to $2,720,618,000 at the end of 2001 due to inflation.

Other Data Sources – Investigations were made of other data sources, with varying utility. The Bureau of Labor Statistics of the United States Department of Labor publishes an “average annual pay” figure, by county. The BLS calculated that to be $44,336 for 2001 for Montgomery County, which seems to be too low for residents of Lower Merion Township in light of what is known about Lower Merion’s demographics in comparison with those of the County as a whole, even taking into account two-wage earner families as a surrogate for the IRS data (e.g.,  reflected in joint tax returns), in light of IRS and census data. The Pennsylvania Economy League – Eastern Division has done extensive research on local tax matters, as has Professor Robert Inman of the Wharton School of the University of Pennsylvania, and their work was drawn upon as well.

Calculation of Estimated Revenue from Imposition of an Earned Income and Net Profits Tax

As has been noted before, it is difficult to make a totally reliable estimate of the yield from a new EIT/NPT. Current, comprehensive and consistent information is lacking, and the diversity of taxing jurisdictions and the approaches they take tends to obscure rather than illuminate. Facts pertaining to such matters as deductions on the net profits side of the EIT/NPT are not available. With that in mind, three different approaches were taken to estimate EIT/NPT yield, disregarding questions of collection efficiency and/or cost, and a comparison was made to Township staff-generated estimates. In each case, the calculation included neither Township residents who work in Philadelphia (because of the Sterling Act), nor residents of other areas which impose a resident EIT/NPT (in light of the crediting of tax to home jurisdictions), and indicates that 22,246 persons not now paying EIT/NPT will become subject to the tax (based upon the percentage allocation of approach #1, below):

1.      Using the information provided by the tax collection agencies, adjusted per capita tax liability was used to determine how the composite rate would translate into a .5% EIT/NPT paid to the Township by residents of other areas which do not impose the EIT/NPT. Receipts from Lower Merion residents working in EIT/NPT jurisdictions were calculated by use of the survey data and the imputed collections from the principal municipalities from which EIT/NPT survey information was not obtained, all for 2001. Other estimates (for persons who are Township residents and who do not now pay EIT/NPT) were based on per capita income figures derived from the IRS zip code data for 1998 (indexed to 2001).

A mixed approach was taken for the other efforts. In each case, the composite per capita income number derived from the EIT/NPT survey was used to calculate the prospective tax liability for Lower Merion-employed persons who are not residents of the Township:

2.      The 2000 Census data as to earned income per household were used to determine aggregate and per-household earned income for all Lower Merion residents, exclusive only of those who are employed in Philadelphia. The .5% tax rate was applied to that income number.

3.      The .5% tax rate was applied to the wage and salary income number from the analysis which inter-relates  IRS zip code figures with allocated Township population and income numbers derived from the Census for the persons noted in Number 2., above. An inflation-based variation was added, taking into account wage  inflation in the Philadelphia area since 1998. [viii]

Table 3.3 summarizes the results of the several approaches.

Table 3.3 – Alternative Approaches to EIT/NPT Revenue Estimates

Taxpayer Group

#1

Tax

Collectors

(2001 Basis)

#2

2000 Census and Tax Collectors 1

#3

Inflation-Indexed Allocated IRS Zip Code Data and Tax Collectors1

Live and work in the Township

$ 4,191,904

  $ 8,274,994

  $ 9,250,103

Live in the Township - work out of state

    631,936

n/a

n/a

Live in the Township - work in a jurisdiction which imposes EIT/NPT on non-residents (other than Philadelphia)

  1,493,941

n/a

n/a

Live in the Township - work in a jurisdiction which does not impose EIT/NPT, or which does not impose it on non-residents

  2,735,157

n/a

n/a

Live in a jurisdiction which does not impose  EIT/NPT - work in the Township

  1,363,836

   1,363,836

    1,363,836

Estimated Yield

 $ 10,416,773

$ 9,638,830

  $ 10,613,938

1Note: Amounts in “Live and work in the Township” are inclusive of amounts allocable to the three categories which follow.

Berkheimer in July of 2002 estimated that a 1.0% EIT/NPT would produce $12 million when fully implemented (thereby producing about half of that amount were Lower Merion Township to impose a .5% EIT/NPT), and Township staff has estimated $8.7 million as the likely yield. On the basis of the four approaches noted above, which average to $10,183,341, it is estimated that upon full implementation (assuming that no municipalities not now imposing an EIT/NPT decide to do so and current employment patterns) the Township would realize $10,100,000. approximately 87% of that amount would be paid by Township residents. Using this approach should provide enough latitude to deal with presently unknown factors.

Of the several approaches described above, #1 is calculated on a 2001 basis, and the others also take inflation into account, bringing the 1998 IRS data to the end of 2001. Wage inflation in the Philadelphia region has been low over the first six months of 2002, on a June 2001-June 2002 basis rising only 1.5%. The 23 forecasters who contribute to the Livingston Survey, published by the Federal Reserve Bank of Philadelphia, in June of this year forecasted a 10-year CPI-U price median inflation rate of 2.5%, a mean rate of 2.589%, and a rate of 4.7% during the 2001-2003 period (slightly more than 2.0% p.a.). If 2.0% is used as a conservative assumption, the cumulative impact would be 8.2% through 2005.[ix] Applying that factor to the estimate, the yield would increase to over $10.9 million.

Two additional factors could be taken into account were there a desire on the part of the Township to add some conservative assumptions into the mix. The first relates to Township residents who work out of state, and some of those persons may remit income-based taxes to other jurisdictions and may or may not be entitled to a credit on a Township-levied EIT/NPT. The second relates to the group of persons who live in jurisdictions which do not impose an EIT/NPT. Apart from anything which might occur to change the Sterling Act, there is some likelihood that more municipalities in Southeastern Pennsylvania will enact an EIT/NPT before 2005. While the Township could enjoy the benefits of not having to pay those amounts over to some “home” municipalities (as is the case now with jurisdictions which impose the EIT/NPT on Lower Merion citizens without having to pay anything over to the Township) for some time, a more conservative approach might be to assume that all remaining non-EIT/NPT municipalities will enact that tax prior to the Township’s EIT/NPT becoming effective.

With those two considerations factored in – the prospect of credits for Township residents working out of state causing a 50% reduction in anticipated revenue and the elimination of 100% of the EIT/NPT on nonresidents) the estimated revenue would drop to $5,894,000 in 2004 and $8,420,000 in the next year, without regard to inflation. Were the 8.2% inflation factor applied to the 2005 amount, the total would approximate $9,110,000.

 

Return to the Table of Contents



[i] Pennsylvania Department of Community and Economic Development, Taxation Manual, Seventh Edition, Harrisburg, May 1999, http://www.inventpa.com/docs/taxation.txt, Jul 26, 2002 (the “DCED Tax Manual”).

[ii] DCED Tax Manual.

[iii] 53 P.S. 6913 and DCED Tax Manual.

[iv] 1990 Labor Force Location Information, P048 Place of Work Minor Civil Division Level Universe Workers 16 Years and Over, Data Set: 1990 Summary Tape File 3 (STF 3), Sample data, US Bureau of the Census.

[v] Pennsylvania Economy League -  Eastern Division; provided in May, 2002.

[vi] Regional Data Bulletin – Population and Employment Forecasts, 2000-2025, 9-County DVRPC Region, Delaware Valley Regional Planning Commission, March, 2002 (the “DVRPC Forecast”).

[vii] DVRPC Forecast.

[viii] Bureau of Labor Statistics, as per note 3., supra.

[ix] June 2001-June 2002 data from Bureau of Labor Statistics, as per note 3., supra; Forecasts from Federal Reserve Bank of Philadelphia, August 5, 2002. The “CPI-U” index relates to “all urban consumers” in the Philadelphia area, whereas the “CPI-W” index focuses on wage earners. Notwithstanding the differences which appear from time to time, the aggregate change in the indices is within .4 percent since the 1982-84 benchmark period upon which the indices are based.